AS212508 LOWHOSTING-AS Lowhosting services of Davide Gennari

AS overview

Test target: 2a0e:b107:dd1::1:1ce7:b8a7 · lg.lowhosting.com · address space: unknown · prefixes announced: 16

prefix(es): 2a0e:b107:dd4::/48, 2a0e:b107:ddb::/48, 2a0e:b107:dd1::/48, 2a0e:b107:dda::/48, 2a0e:b107:dd9::/48, 2a0e:b107:dd2::/48, 2a0e:b107:ddf::/48, 2a0e:b107:dd7::/48 (+8 more)

Targets & per-vantage-point probe results (1 target(s) across 7 vantage point(s))

Source codes (hover any badge for full description): CUR=curated · NS/SOA/MX=DNS records · SPF=SPF TXT · DRV=holder-derived (www, ns1, mail, gw, …) · ATL=RIPE Atlas · PDB=PeeringDB · WHOIS=RIPE whois · RDAP=RIPE RDAP · HIT=IPv6 Hitlist · RTR=in-prefix path hop (router) · PRB=static prefix probe · SYN=synthetic prefix::1 fallback

Target IP / hostname	Source	SRB host (SOX, Belgrade)					DE host (Berlin)					DE host (Düsseldorf)					NL host (go6lab)					ITA host (Karsolink)					SLO host (6connect)					SLO host (T-2)
Target IP / hostname	Source	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached
`2a0e:b107:dd1::1:1ce7:b8a7` lg.lowhosting.com	drv	✓	✗	open	open	✓	✓	✗	open	open	✓	✓	✗	open	open	✓	✓	✗	open	open	✓	✓	✗	open	open	✓	✓	✗	open	open	✓	✓	✗	open	open	✓

RPKI & ASPA

16 of 16 prefix(es) covered by a valid ROA.

Prefix	RPKI state	Reason	Covering VRP(s)
`2a0e:b107:dd4::/48`	✓ valid	matched VRP (correct origin, length within maxLength)	AS212508 /44 maxLen 48 (ripe)
`2a0e:b107:ddb::/48`	✓ valid	matched VRP (correct origin, length within maxLength)	AS212508 /44 maxLen 48 (ripe)
`2a0e:b107:dd1::/48`	✓ valid	matched VRP (correct origin, length within maxLength)	AS212508 /44 maxLen 48 (ripe)
`2a0e:b107:dda::/48`	✓ valid	matched VRP (correct origin, length within maxLength)	AS212508 /44 maxLen 48 (ripe)
`2a0e:b107:dd9::/48`	✓ valid	matched VRP (correct origin, length within maxLength)	AS212508 /44 maxLen 48 (ripe)
`2a0e:b107:dd2::/48`	✓ valid	matched VRP (correct origin, length within maxLength)	AS212508 /44 maxLen 48 (ripe)
`2a0e:b107:ddf::/48`	✓ valid	matched VRP (correct origin, length within maxLength)	AS212508 /44 maxLen 48 (ripe)
`2a0e:b107:dd7::/48`	✓ valid	matched VRP (correct origin, length within maxLength)	AS212508 /44 maxLen 48 (ripe)
`2a0e:b107:dd8::/48`	✓ valid	matched VRP (correct origin, length within maxLength)	AS212508 /44 maxLen 48 (ripe)
`2a0e:b107:ddd::/48`	✓ valid	matched VRP (correct origin, length within maxLength)	AS212508 /44 maxLen 48 (ripe)
`2a0e:b107:dd3::/48`	✓ valid	matched VRP (correct origin, length within maxLength)	AS212508 /44 maxLen 48 (ripe)
`2a0e:b107:dd5::/48`	✓ valid	matched VRP (correct origin, length within maxLength)	AS212508 /44 maxLen 48 (ripe)
`2a0e:b107:dd6::/48`	✓ valid	matched VRP (correct origin, length within maxLength)	AS212508 /44 maxLen 48 (ripe)
`2a0e:b107:dd0::/48`	✓ valid	matched VRP (correct origin, length within maxLength)	AS212508 /44 maxLen 48 (ripe)
`2a0e:b107:dde::/48`	✓ valid	matched VRP (correct origin, length within maxLength)	AS212508 /44 maxLen 48 (ripe)
`2a0e:b107:ddc::/48`	✓ valid	matched VRP (correct origin, length within maxLength)	AS212508 /44 maxLen 48 (ripe)

Random-IP probe (yarrp) into the AS' prefixes

At least one router inside AS212508's announced prefix replied during the random-target probe. Hop(s): 2a0e:b107:dd8:ffff:ffff:ffff:ffff:f244. These are candidate targets for direct testing.

ICMPv6 Type 2 (Packet Too Big) acceptance - active test

Type 2 not honored. Forged ICMPv6 PTB (MTU=1280) had no effect: the next 1500-byte Echo Reply still arrived whole (1360 B, no Fragment Header). PMTUD does not work toward this address from us.
method: ICMPv6 Echo + forged PTB, tested 2026-09-23T12:07:55Z

Failure detail - what to grep in your logs

vantage	our source	your target	method	result	tested (UTC)
belgrade	`2a09:ab81::91`	`2a0e:b107:dd1::1:1ce7:b8a7`	`icmp6-echo`	not_honored	2026-09-23T12:07:55Z
berlin	`2a06:d1c1:10b::cccc`	`2a0e:b107:dd1::1:1ce7:b8a7`	`tls`	not_honored	2026-09-23T12:07:53Z
duseldorf	`2a06:d1c1:10d::aaaa`	`2a0e:b107:dd1::1:1ce7:b8a7`	`icmp6-echo`	not_honored	2026-09-23T12:07:50Z
go6lab	`2a00:8642:42::75`	`2a0e:b107:dd1::1:1ce7:b8a7`	`icmp6-echo`	not_honored	2026-09-23T12:09:30Z
karsolink	`2a12:d8c0:105a:9001::a154`	`2a0e:b107:dd1::1:1ce7:b8a7`	`icmp6-echo`	not_honored	2026-09-23T12:07:54Z
odin	`2607:fae0:a000::42`	`2a0e:b107:dd1::1:1ce7:b8a7`	`icmp6-echo`	not_honored	2026-09-23T12:07:52Z
t2	`2a01:261:313:b814:2a0:98ff:fe5b:13e4`	`2a0e:b107:dd1::1:1ce7:b8a7`	`icmp6-echo`	not_honored	2026-09-23T12:07:54Z

Attempt log (belgrade):

icmp6-echo → not_honored (reply shrank 1360→1360 B)
dns-tcp → no_tcp: connect failed: [Errno 111] Connection refused
tls → not_honored (reply shrank 2696→2696 B)
http → inconclusive (reply 359 B before PTB): natural max segment 359B already <= 1220B; nothing to shrink

Attempt log (berlin):

icmp6-echo → inconclusive (reply 1360 B before PTB): no Echo Reply after PTB (probe 1400B)
dns-tcp → no_tcp: connect failed: [Errno 111] Connection refused
tls → not_honored (reply shrank 2696→2696 B)
http → inconclusive (reply 359 B before PTB): natural max segment 359B already <= 1220B; nothing to shrink

Attempt log (duseldorf):

icmp6-echo → not_honored (reply shrank 1360→1360 B)
dns-tcp → no_tcp: connect failed: [Errno 111] Connection refused
tls → not_honored (reply shrank 2696→2696 B)
http → inconclusive (reply 359 B before PTB): natural max segment 359B already <= 1220B; nothing to shrink

Attempt log (go6lab):

icmp6-echo → not_honored (reply shrank 1360→1360 B)
dns-tcp → no_tcp: connect failed: timed out
tls → inconclusive: TLS exchange produced no observable segment data
http → inconclusive (reply 359 B before PTB): natural max segment 359B already <= 1220B; nothing to shrink

Attempt log (karsolink):

icmp6-echo → not_honored (reply shrank 1360→1360 B)
dns-tcp → no_tcp: connect failed: [Errno 111] Connection refused
tls → not_honored (reply shrank 2696→2696 B)
http → inconclusive (reply 359 B before PTB): natural max segment 359B already <= 1220B; nothing to shrink

Attempt log (odin):

icmp6-echo → not_honored (reply shrank 1360→1360 B)
dns-tcp → no_tcp: connect failed: [Errno 111] Connection refused
tls → not_honored (reply shrank 2696→2696 B)
http → inconclusive (reply 359 B before PTB): natural max segment 359B already <= 1220B; nothing to shrink

Attempt log (t2):

icmp6-echo → not_honored (reply shrank 1360→1360 B)
dns-tcp → no_tcp: connect failed: [Errno 111] Connection refused
tls → partial (reply shrank 2696→1348 B)
http → inconclusive (reply 359 B before PTB): natural max segment 359B already <= 1220B; nothing to shrink

To match the corresponding ICMPv6 packet on your side (host firewall, AS edge, or transit tap), look for our PTBs around the timestamps above:

sudo tcpdump -i any -n -e 'icmp6 and ip6[40] = 2 and (src host 2607:fae0:a000::42 or src host 2a00:8642:42::75 or src host 2a01:261:313:b814:2a0:98ff:fe5b:13e4 or src host 2a06:d1c1:10b::cccc or src host 2a06:d1c1:10d::aaaa or src host 2a09:ab81::91 or src host 2a12:d8c0:105a:9001::a154)'

If you see our PTBs arriving but the destination's TCP/Echo flow does not shrink, the drop is in the destination kernel (cause 3 below). If you don't see them at all, drop is upstream of you (cause 2). If you only see them from some of our source IPs but not others, the drop is path-asymmetric - at least one transit on the differing route is filtering.

What does "Type 2 not honored" actually mean? - click to expand

What this test does

Using the icmp6-echo method, we send a 1500-byte ICMPv6 Echo Request, then a forged ICMPv6 Type 2 (Packet Too Big) declaring path MTU=1280, and observe whether the next Echo Reply arrives split into IPv6 fragments. RFC 4890 requires hosts and intermediate networks not to filter ICMPv6 Type 2; the destination's TCP/UDP stack must act on a received PTB by lowering its Path MTU cache for that destination, which makes subsequent segments smaller.

What we measured

The TCP segment size your server emitted before our forged Type 2 was 1360 B; after, it was 1360 B. No change. RFC 4890 ("Type 2 messages MUST NOT be filtered") expects subsequent segments to shrink to fit a Path MTU of 1280 B.

Three plausible causes

Your host firewall is dropping ICMPv6 Type 2 inbound. Many default firewall rule sets only allow Echo Request/Reply and Neighbor Discovery, silently dropping all other ICMPv6 types - including Packet Too Big.
An upstream / transit network is dropping ICMPv6 Type 2 before it reaches you. Some transit ASes filter ICMPv6 messages other than Echo at the edge. The forged PTB never arrives, so your stack never has a chance to act on it.
Your kernel is ignoring the PTB. Linux / BSD stacks normally accept ICMPv6 PTB and update the route cache, but a few sysctls (or a hardened kernel) can be configured to ignore PMTU updates - typically as part of an over-aggressive anti-spoofing or uRPF policy.

How to check & fix (Linux examples)

1. Confirm Type 2 is not blocked at the host firewall:

sudo ip6tables -L INPUT -nv | grep -iE 'icmpv6|packet-too-big'
sudo nft list ruleset 2>/dev/null | grep -A1 'icmpv6'

If you see rules dropping ICMPv6 unconditionally, change them to permit at least icmpv6 type packet-too-big (and destination-unreachable, time-exceeded, parameter-problem per RFC 4890).

2. Confirm the kernel accepts incoming PTB:

sudo sysctl net.ipv6.conf.all.accept_redirects net.ipv4.ip_no_pmtu_disc net.ipv6.route.mtu_expires

The defaults (accept_redirects=1, ip_no_pmtu_disc=0) are the right values for honoring PTB.

3. Live trace: while we have an open TCP flow with a small MSS (we run our test from 2607:fae0:a000::42 on odin, 2a00:8642:42::75 on go6lab, 2a12:d8c0:105a:9001::a154 on karsolink, 2a09:ab81::91 on belgrade, 2a01:261:313:b814:2a0:98ff:fe5b:13e4 on t2, 2a06:d1c1:10a::bbbb on amsterdam, 2a06:d1c1:10d::aaaa on duseldorf and 2a06:d1c1:10b::cccc on berlin), watch for our forged Type 2 arriving on your interface:

sudo tcpdump -i any -n -e 'icmp6 and ip6[40] = 2 and (src host 2607:fae0:a000::42 or src host 2a00:8642:42::75 or src host 2a12:d8c0:105a:9001::a154 or src host 2a09:ab81::91 or src host 2a01:261:313:b814:2a0:98ff:fe5b:13e4 or src host 2a06:d1c1:10a::bbbb or src host 2a06:d1c1:10d::aaaa or src host 2a06:d1c1:10b::cccc)'

If you see our PTBs arriving but TCP segments still stay big, the drop is in your kernel or NIC offload (cause 3). If you don't see them at all, the drop is upstream of you (cause 2) - ask your upstream(s) to permit ICMPv6 Type 2.

4. If your test target above (2026-09-23T12:07:55Z) is a host that you don't own (e.g. a third-party DNS / TLS server you happen to operate prefixes for), the verdict reflects that specific host's behaviour - try the test against a server you do own and we'll happily re-run.

RFC 4890 references: §4.3.1 (Packet Too Big - MUST NOT be dropped), and RFC 8201 for the broader PMTUD requirement.

Where the path divergence is

Mixed disagreement. At least one pair of vantages used the same probe method and disagreed (real Type 2 asymmetry); other pairs used different methods (probe-availability noise). The path-divergence summary below covers all pairs; the AI interpretation focuses on the real cases.

Per-vantage probe + verdict (headline):

belgrade: probe icmp6-echo → verdict not_honored
berlin: probe tls → verdict not_honored
duseldorf: probe icmp6-echo → verdict not_honored
go6lab: probe icmp6-echo → verdict not_honored
karsolink: probe icmp6-echo → verdict not_honored
odin: probe icmp6-echo → verdict not_honored
t2: probe icmp6-echo → verdict not_honored

Full per-method matrix (all four methods run at each vantage):

vantage	icmp6-echo	dns-tcp	tls	http
belgrade	not_honored	no_tcp	not_honored	inconclusive
berlin	inconclusive	no_tcp	not_honored	inconclusive
duseldorf	not_honored	no_tcp	not_honored	inconclusive
go6lab	not_honored	no_tcp	inconclusive	inconclusive
karsolink	not_honored	no_tcp	not_honored	inconclusive
odin	not_honored	no_tcp	not_honored	inconclusive
t2	not_honored	no_tcp	partial	inconclusive

✓ All vantages agree on method(s): icmp6-echo - the headline-method spread above is dispatcher noise, not a real Type 2 disagreement.

These vantage-level disagreements are rooted somewhere in the forward paths. Joining each per-vantage traceroute against the IP→AS lookup from our global yarrp mesh, the first hop where the paths land in different ASes is the most likely site of the offending filter / unreachable AS / Type 2 drop.

Suspect transit ASes (ranked by how often they appear at the divergence point on the path of the worse-classifying vantage): AS212508, AS6939, AS50673.

From belgrade (echo_only/Type-2=not_honored) the path enters an opaque hop at hop 10; from berlin (echo_only/Type-2=not_honored) the same hop is in AS212508. Last common AS: AS212508. The disagreement is most likely rooted in one of those two transit ASes.
From belgrade (echo_only/Type-2=not_honored) the path enters an opaque hop at hop 12; from duseldorf (echo_only/Type-2=not_honored) the same hop is in AS212508. Last common AS: AS212508. The disagreement is most likely rooted in one of those two transit ASes.
From belgrade (echo_only/Type-2=not_honored) the path enters an opaque hop at hop 13; from go6lab (echo_only/Type-2=not_honored) the same hop is in AS212508. Last common AS: AS212508. The disagreement is most likely rooted in one of those two transit ASes.
From belgrade (echo_only/Type-2=not_honored) the path enters an opaque hop at hop 9; from karsolink (echo_only/Type-2=not_honored) the same hop is in AS212508. Last common AS: AS212508. The disagreement is most likely rooted in one of those two transit ASes.
From belgrade (echo_only/Type-2=not_honored) the path enters AS212508 at hop 5; from odin (echo_only/Type-2=not_honored) the same hop is in AS6939. Last common AS: AS212508. The disagreement is most likely rooted in one of those two transit ASes.
From belgrade (echo_only/Type-2=not_honored) the path enters an opaque hop at hop 10; from t2 (echo_only/Type-2=not_honored) the same hop is in AS212508. Last common AS: AS212508. The disagreement is most likely rooted in one of those two transit ASes.
From berlin (echo_only/Type-2=not_honored) the path enters an opaque hop at hop 12; from duseldorf (echo_only/Type-2=not_honored) the same hop is in AS212508. Last common AS: AS212508. The disagreement is most likely rooted in one of those two transit ASes.
From berlin (echo_only/Type-2=not_honored) the path enters an opaque hop at hop 16; from go6lab (echo_only/Type-2=not_honored) the same hop is in AS212508. Last common AS: AS212508. The disagreement is most likely rooted in one of those two transit ASes.
From berlin (echo_only/Type-2=not_honored) the path enters AS212508 at hop 10; from karsolink (echo_only/Type-2=not_honored) the same hop is in an opaque hop. Last common AS: AS212508. The disagreement is most likely rooted in one of those two transit ASes.
From berlin (echo_only/Type-2=not_honored) the path enters AS212508 at hop 13; from t2 (echo_only/Type-2=not_honored) the same hop is in an opaque hop. Last common AS: AS212508. The disagreement is most likely rooted in one of those two transit ASes.
From duseldorf (echo_only/Type-2=not_honored) the path enters an opaque hop at hop 13; from go6lab (echo_only/Type-2=not_honored) the same hop is in AS212508. Last common AS: AS212508. The disagreement is most likely rooted in one of those two transit ASes.
From duseldorf (echo_only/Type-2=not_honored) the path enters AS212508 at hop 15; from karsolink (echo_only/Type-2=not_honored) the same hop is in an opaque hop. Last common AS: AS212508. The disagreement is most likely rooted in one of those two transit ASes.
From duseldorf (echo_only/Type-2=not_honored) the path enters AS212508 at hop 12; from odin (echo_only/Type-2=not_honored) the same hop is in an opaque hop. Last common AS: AS212508. The disagreement is most likely rooted in one of those two transit ASes.
From duseldorf (echo_only/Type-2=not_honored) the path enters AS212508 at hop 12; from t2 (echo_only/Type-2=not_honored) the same hop is in an opaque hop. Last common AS: AS212508. The disagreement is most likely rooted in one of those two transit ASes.
From go6lab (echo_only/Type-2=not_honored) the path enters AS212508 at hop 13; from karsolink (echo_only/Type-2=not_honored) the same hop is in an opaque hop. Last common AS: AS212508. The disagreement is most likely rooted in one of those two transit ASes.
From go6lab (echo_only/Type-2=not_honored) the path enters AS50673 at hop 3; from odin (echo_only/Type-2=not_honored) the same hop is in AS56635. Last common AS: AS212508. The disagreement is most likely rooted in one of those two transit ASes.
From go6lab (echo_only/Type-2=not_honored) the path enters AS212508 at hop 13; from t2 (echo_only/Type-2=not_honored) the same hop is in an opaque hop. Last common AS: AS212508. The disagreement is most likely rooted in one of those two transit ASes.
From karsolink (echo_only/Type-2=not_honored) the path enters an opaque hop at hop 10; from odin (echo_only/Type-2=not_honored) the same hop is in AS212508. Last common AS: AS212508. The disagreement is most likely rooted in one of those two transit ASes.
From karsolink (echo_only/Type-2=not_honored) the path enters an opaque hop at hop 10; from t2 (echo_only/Type-2=not_honored) the same hop is in AS212508. Last common AS: AS212508. The disagreement is most likely rooted in one of those two transit ASes.
From odin (echo_only/Type-2=not_honored) the path enters AS212508 at hop 13; from t2 (echo_only/Type-2=not_honored) the same hop is in an opaque hop. Last common AS: AS212508. The disagreement is most likely rooted in one of those two transit ASes.

Diagnosis is path-level, not packet-level: it tells you which transit AS is the prime suspect, not exactly which firewall rule is to blame. Use the tracepath6 output below (when available) for per-hop PMTU evidence on the same path.

✨ Diagnostic interpretation

An operator-targeted diagnostic interpretation can be generated for this AS on demand. The pipeline holds the raw verdicts and the per-hop walk; an AI pass synthesises where to start looking. Click the button below to run it.

Multi-vantage path map

Every hop of all vantages’ traceroutes toward the target, drawn left→right, grouped into per-AS bubbles (a hop seen from several vantages is one shared bubble, so converging paths merge). It answers two questions per vantage — shown on each source bubble as echo ✓/⚠/✗ · trace ✓/✗: did the destination reply to ICMPv6 Echo (✓ honored, ⚠ replied but PTB not honored, ✗ no reply), and did the traceroute reach it. A line to the target is drawn only when that vantage got an echo reply — solid if the PTB was honored, dashed if not (reachable but a broken-PMTUD / RFC 4890 violation). The path depth still shows how far the traceroute itself got, and runs of unanswered (* *) hops collapse into one dashed “silent” bubble. Open full size ↗

● SRB host (SOX, Belgrade)
● DE host (Berlin)
● DE host (Düsseldorf)
● NL host (go6lab)
● ITA host (Karsolink)
● SLO host (6connect)
● SLO host (T-2)
── solid line = echo reply, PTB honored (clean reach)
— — dashed line = echo reply but PTB not honored (RFC 4890 violation)
no line = no echo reply (never reached)
◉ target: green = clean, amber = reachable-but-violation / unreachable
⚠ suspected drop AS
⋯ silent (unanswered) hops
● IXP hop

From SRB host (SOX, Belgrade) echo onlyRFC 4890 ✗

filter likely at: destination AS212508 (LOWHOSTING-AS) · min PMTU on path: 1500

4/4

Echo small (56B) 40.8ms

0/4

Echo 1500B (DF) -

yes

Type 1 dest-unreach

443,80

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	2a09:ab81::1	0.2ms	0%*	AS60733	PERKE-NET - ZORAN PEROVIC trading as Agencija Perke.NET, RS
2	sox-pn.sox.rs 2001:7f8:1e:8::3a	0.4ms	0%	AS13004	SOX - Serbian Open Exchange DOO, RS
3	2001:7f8:1e:8::3d	0.5ms	0%	AS13004	SOX - Serbian Open Exchange DOO, RS
4	2001:67c:128c::699	17.8ms	0%	-	NA
5	2a0e:b107:dd1::1:1ce7:b8a7	41.3ms	0%	AS212508	LOWHOSTING-AS - Lowhosting services of Davide Gennari, IT

tracepath -6

 1?: [LOCALHOST]                        0.012ms pmtu 1500
 1:  _gateway                                              0.415ms 
 1:  _gateway                                              0.300ms 
 2:  sox-pn.sox.rs                                         0.721ms 
 3:  2001:7f8:1e:8::3d                                     0.567ms asymm  2 
 4:  2001:67c:128c::699                                   19.761ms 
 5:  no reply
 6:  no reply
 7:  no reply
 8:  no reply
 9:  no reply
10:  no reply
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
19:  no reply
20:  no reply
21:  no reply
22:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500

From DE host (Berlin) echo onlyRFC 4890 ✗

filter likely at: destination AS212508 (LOWHOSTING-AS) · min PMTU on path: 1500

4/4

Echo small (56B) 18.2ms

0/4

Echo 1500B (DF) -

yes

Type 1 dest-unreach

443,80

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	xe-0-0-13-178.gw01.ber01.as59645.net 2a06:d1c1:100:b::1	0.3ms	0%*	AS59645	WYBT-NET - Tobias Fiebig, DE
2	ae0-2453.cr10.ber01.lwlcom.net 2a06:d1c0::dead:beef:1c02	0.6ms	0%*	AS59645	WYBT-NET - Tobias Fiebig, DE
3	ae3-90.cr10.ham01.lwlcom.net 2a00:c380:b200:230::192	4.7ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
4	ae0-50.cr11.ham01.lwlcom.net 2a00:c380:b200:230::45	5.0ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
5	2a00:c380:f000::4b	5.2ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
6	ae4-2087.dus10.core-backbone.com 2a01:4a0:0:2087::33	11.3ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
7	ae21-2071.fra10.core-backbone.com 2a01:4a0:0:2071::4	10.8ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
8	coreb-fra.cdn77.com 2a02:6ea0:5:1140:3192::9	13.0ms	0%	-	NA
9	vl222.fra-drt10-dist-1.cdn77.com 2a02:6ea0:1:6::c3	13.1ms	20%	-	NA
10	2a0e:b107:dd8:ffff:ffff:ffff:ffff:f244	12.8ms	0%	AS212508	LOWHOSTING-AS - Lowhosting services of Davide Gennari, IT
11	*	-	-	-
12	*	-	-	-
13	2a0e:b107:dd1::1:1ce7:b8a7	18.2ms	0%	AS212508	LOWHOSTING-AS - Lowhosting services of Davide Gennari, IT

Rate-limited ICMPv6: hop 9 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.022ms pmtu 1500
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.471ms 
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.543ms 
 2:  ae0-2453.cr10.ber01.lwlcom.net                        1.129ms 
 3:  ae3-90.cr10.ham01.lwlcom.net                          4.996ms 
 4:  ae0-50.cr11.ham01.lwlcom.net                          5.187ms 
 5:  2a00:c380:f000::4b                                    5.548ms asymm  4 
 6:  ae4-2087.dus10.core-backbone.com                     11.610ms asymm  5 
 7:  ae21-2071.fra10.core-backbone.com                    10.937ms asymm  5 
 8:  coreb-fra.cdn77.com                                  14.665ms 
 9:  vl222.fra-drt10-dist-2.cdn77.com                     13.279ms 
10:  ???                                                  13.195ms 
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
19:  no reply
20:  no reply
21:  no reply
22:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500

From DE host (Düsseldorf) echo onlyRFC 4890 ✗

filter likely at: destination AS212508 (LOWHOSTING-AS) · min PMTU on path: 1500

4/4

Echo small (56B) 12.4ms

0/4

Echo 1500B (DF) -

yes

Type 1 dest-unreach

443,80

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	xe-0-0-12-142.gw01.dus01.as59645.net 2a06:d1c1:100:d::1	0.2ms	0%*	AS59645	WYBT-NET - Tobias Fiebig, DE
2	eth1-0-12-h5594.edge5-dus1.bb.wiit.network 2001:4ba0:92f4:3::1	0.9ms	0%	AS24961	MYLOC-AS - WIIT AG, DE
3	*	-	-	-
4	lag11.core3-dus1.bb.wiit.network 2001:4ba0:ffe9:115::3	0.2ms	0%	AS24961	MYLOC-AS - WIIT AG, DE
5	lag0-vl1010.core1-ams-ni.bb.wiit.network 2001:4ba0:ffe9:153::3	3.7ms	0%	AS24961	MYLOC-AS - WIIT AG, DE
6	2001:730:2205:46::d52e:c089	7.4ms	0%	AS6830	LibertyGlobal - Liberty Global Europe Holding B.V., NL
7	2001:730:2200::5474:8025	13.2ms	0%	AS6830	LibertyGlobal - Liberty Global Europe Holding B.V., NL
8	*	-	-	-
9	2001:730:2d00::5474:80f8	13.9ms	0%	AS6830	LibertyGlobal - Liberty Global Europe Holding B.V., NL
10	2001:730:2d0e::d52e:b026	7.2ms	0%	AS6830	LibertyGlobal - Liberty Global Europe Holding B.V., NL
11	vl222.fra-drt10-dist-2.cdn77.com 2a02:6ea0:1:6::c4	7.2ms	10%	-	NA
12	2a0e:b107:dd8:ffff:ffff:ffff:ffff:f244	7.1ms	0%	AS212508	LOWHOSTING-AS - Lowhosting services of Davide Gennari, IT
13	*	-	-	-
14	*	-	-	-
15	2a0e:b107:dd1::1:1ce7:b8a7	12.4ms	0%	AS212508	LOWHOSTING-AS - Lowhosting services of Davide Gennari, IT

Rate-limited ICMPv6: hop 11 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.015ms pmtu 1500
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.396ms 
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.262ms 
 2:  eth1-0-12-h5594.edge5-dus1.bb.wiit.network            1.363ms 
 3:  no reply
 4:  lag11.core3-dus1.bb.wiit.network                      0.361ms 
 5:  lag0-vl1010.core1-ams-ni.bb.wiit.network              4.016ms 
 6:  no reply
 7:  2001:730:2200::5474:8025                             13.571ms asymm  8 
 8:  no reply
 9:  2001:730:2d00::5474:80f8                             13.827ms asymm  6 
10:  2001:730:2d0e::d52e:b026                              7.396ms asymm  7 
11:  no reply
12:  ???                                                   7.297ms asymm  9 
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
19:  no reply
20:  no reply
21:  no reply
22:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500

From NL host (go6lab) echo onlyRFC 4890 ✗

filter likely at: destination AS212508 (LOWHOSTING-AS) · min PMTU on path: 1500

4/4

Echo small (56B) 19.5ms

0/4

Echo 1500B (DF) -

yes

Type 1 dest-unreach

443,80

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	2a00:8642:42::2	3.2ms	0%	AS203993	GNA-DC1-AS - S.J.M. Steffann, NL
2	gw.friends.steffann.nl 2a00:8642:1000:f000::1	4.2ms	0%*	AS203993	GNA-DC1-AS - S.J.M. Steffann, NL
3	2a00:1ca8:1::194	2.0ms	0%	AS50673	Serverius-as - Serverius Holding B.V., NL
4	2a03:3f40::10:41	5.2ms	0%	AS50673	Serverius-as - Serverius Holding B.V., NL
5	ix-et-9-1-2.tcore1.ad1-amsterdam.ipv6.as6453.net 2a01:3e0:30:1::1	5.9ms	0%	AS6453	AS6453 - TATA COMMUNICATIONS (AMERICA) INC, US
6	if-bundle-2-2.qcore1.ad1-amsterdam.ipv6.as6453.net 2a01:3e0:701::7	3.2ms	0%	AS6453	AS6453 - TATA COMMUNICATIONS (AMERICA) INC, US
7	*	-	50%	-
8	if-bundle-9-2.qcore1.fnm-frankfurt.ipv6.as6453.net 2a01:3e0:ff40:20::25	11.9ms	30%	AS6453	AS6453 - TATA COMMUNICATIONS (AMERICA) INC, US
9	if-bundle-67-2.qcore2.fr0-frankfurt.ipv6.as6453.net 2a01:3e0:ff00::115	16.0ms	30%	AS6453	AS6453 - TATA COMMUNICATIONS (AMERICA) INC, US
10	if-bundle-58-2.qcore3.fr0-frankfurt.ipv6.as6453.net 2a01:3e0:ff20::171	29.9ms	0%	AS6453	AS6453 - TATA COMMUNICATIONS (AMERICA) INC, US
11	2a01:3e0:ff20::177	11.1ms	0%	AS6453	AS6453 - TATA COMMUNICATIONS (AMERICA) INC, US
12	vl222.fra-drt10-dist-1.cdn77.com 2a02:6ea0:1:6::c3	12.9ms	30%	-	NA
13	2a0e:b107:dd8:ffff:ffff:ffff:ffff:f244	21.1ms	0%	AS212508	LOWHOSTING-AS - Lowhosting services of Davide Gennari, IT
14	*	-	-	-
15	*	-	-	-
16	2a0e:b107:dd1::1:1ce7:b8a7	15.8ms	0%	AS212508	LOWHOSTING-AS - Lowhosting services of Davide Gennari, IT

Rate-limited ICMPv6: hop 7, hop 8, hop 9, hop 12 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.041ms pmtu 1500
 1:  2a00:8642:42::2                                       8.595ms 
 1:  2a00:8642:42::2                                       3.250ms 
 2:  gw.friends.steffann.nl                                1.855ms 
 3:  2a00:1ca8:1::194                                      2.943ms 
 4:  2a03:3f40::10:41                                      2.872ms 
 5:  ix-ge-100-0-0-66.qhar2.ad1-amsterdam.ipv6.as6453.net   6.601ms 
 6:  if-bundle-2-2.qcore1.ad1-amsterdam.ipv6.as6453.net    4.757ms 
 7:  if-bundle-51-2.qcore1.av2-amsterdam.ipv6.as6453.net   6.822ms 
 8:  if-bundle-9-2.qcore1.fnm-frankfurt.ipv6.as6453.net   13.471ms 
 9:  if-bundle-67-2.qcore2.fr0-frankfurt.ipv6.as6453.net  10.212ms 
 9?: 2a00:1ca8:1::194                                    asymm  3 
10:  if-bundle-58-2.qcore3.fr0-frankfurt.ipv6.as6453.net  17.165ms 
11:  2a01:3e0:ff20::177                                   13.152ms asymm  8 
12:  vl222.fra-drt10-dist-2.cdn77.com                     13.810ms asymm  9 
13:  ???                                                  12.416ms asymm  9 
13?: 2a03:3f40::10:41                                    asymm  4 
13?: 2a00:1ca8:1::194                                    asymm  3 
13?: 2a03:3f40::10:41                                    asymm  4 
13?: 2001:b28:3ff::1b1b:0:1                              asymm  5 
13?: 2001:b28:3ff::1b1b:0:1                              asymm  5 
13?: be10.core1.zrh2.he.net                              asymm  5 
13?: be10.core1.zrh2.he.net                              asymm  5 
13?: be1.core1.mil2.he.net                               asymm  6 
13?: be1.core1.mil2.he.net                               asymm  6 
13?: flynet-AS207054-v6.mix-it.net                       asymm  8

From ITA host (Karsolink) echo onlyRFC 4890 ✗

filter likely at: destination AS212508 (LOWHOSTING-AS) · min PMTU on path: 1500

4/4

Echo small (56B) 24.6ms

0/4

Echo 1500B (DF) -

yes

Type 1 dest-unreach

443,80

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	karsolink-01.net.karsolink.com 2a12:d8c0:105a:9001::1	0.3ms	0%*	AS204471	KARSOLINK - 2S Computers SRL, IT
2	*	-	0%*	-
3	*	-	-	-
4	2a03:b020:1:51::a	10.1ms	0%	AS41327	FIBERTELECOM-AS - Fiber Telecom S.p.A., IT
5	2a03:b020::244	19.0ms	0%	AS41327	FIBERTELECOM-AS - Fiber Telecom S.p.A., IT
6	*	-	-	-
7	datacamp-fra-2.peering.cz 2001:7f8:7f::200	19.3ms	0%	-	NA
8	*	-	-	-
9	2a0e:b107:dd8:ffff:ffff:ffff:ffff:f244	19.3ms	0%	AS212508	LOWHOSTING-AS - Lowhosting services of Davide Gennari, IT
10	*	-	-	-
11	*	-	-	-
12	2a0e:b107:dd1::1:1ce7:b8a7	24.6ms	0%	AS212508	LOWHOSTING-AS - Lowhosting services of Davide Gennari, IT

tracepath -6

 1?: [LOCALHOST]                        0.036ms pmtu 1500
 1:  karsolink-01.net.karsolink.com                        0.657ms 
 1:  karsolink-01.net.karsolink.com                        0.734ms 
 2:  2a12:d8c0:109f:121::a1                                0.925ms 
 3:  no reply
 4:  2a03:b020:1:51::a                                    10.470ms 
 5:  2a03:b020::244                                       19.904ms 
 6:  no reply
 7:  datacamp-fra-2.peering.cz                            19.890ms 
 8:  no reply
 9:  ???                                                  19.776ms asymm 10 
10:  no reply
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
19:  no reply
20:  no reply
21:  no reply
22:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500

From SLO host (6connect) echo onlyRFC 4890 ✗

filter likely at: destination AS212508 (LOWHOSTING-AS) · min PMTU on path: 1500

4/4

Echo small (56B) 24.2ms

0/4

Echo 1500B (DF) -

yes

Type 1 dest-unreach

443,80

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	fw1-lju.6connect.com 2607:fae0:a000::2	0.2ms	0%*	AS8038	6CONNECT - 6connect, Inc., US
2	*	-	0%*	-
3	2a03:a100:0:201:1::1	0.9ms	0%	AS56635	XENYA - XENYA inzeniring, proizvodnja in trgovina, d.o.o. Ljubljana, SI
4	*	-	50%	-
5	100ge0-0-0-5.core1.vie1.he.net 2001:470:0:578::1	7.1ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
6	be3.core1.prg1.he.net 2001:470:e:a7::1	12.1ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
7	*	-	-	-
8	datacamp-fra-2.peering.cz 2001:7f8:7f::200	19.0ms	0%	-	NA
9	vl222.fra-drt10-dist-2.cdn77.com 2a02:6ea0:1:6::c4	20.6ms	30%	-	NA
10	2a0e:b107:dd8:ffff:ffff:ffff:ffff:f244	18.8ms	0%	AS212508	LOWHOSTING-AS - Lowhosting services of Davide Gennari, IT
11	*	-	-	-
12	*	-	-	-
13	2a0e:b107:dd1::1:1ce7:b8a7	22.8ms	0%	AS212508	LOWHOSTING-AS - Lowhosting services of Davide Gennari, IT

Rate-limited ICMPv6: hop 4, hop 9 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.027ms pmtu 9000
 1:  fw1-lju.6connect.com                                  0.705ms 
 1:  fw1-lju.6connect.com                                  0.631ms 
 2:  no reply
 3:  2a03:a100:0:201:1::1                                  1.223ms 
 4:  2a03:a100:0:201:1::1                                  0.876ms pmtu 1500
 4:  e0-1.core1.lju1.he.net                                2.372ms 
 5:  100ge0-0-0-5.core1.vie1.he.net                        8.573ms 
 6:  be3.core1.prg1.he.net                                12.535ms 
 7:  no reply
 8:  datacamp-fra-2.peering.cz                            19.960ms asymm  6 
 9:  vl222.fra-drt10-dist-1.cdn77.com                     21.728ms asymm  7 
10:  ???                                                  19.096ms asymm  8 
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
19:  no reply
20:  no reply
21:  no reply
22:  no reply
     Too many hops: pmtu 1500

From SLO host (T-2) echo onlyRFC 4890 ✗

filter likely at: destination AS212508 (LOWHOSTING-AS) · min PMTU on path: 1500

4/4

Echo small (56B) 38.5ms

0/4

Echo 1500B (DF) -

yes

Type 1 dest-unreach

443,80

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	*	-	0%*	-
2	2a01:260:1::225	4.9ms	0%*	AS34779	T-2-AS - T-2, d.o.o., SI
3	2a01-260-1-1--9a.core6.t-2.net 2a01:260:1:1::9a	2.3ms	0%*	AS34779	T-2-AS - T-2, d.o.o., SI
4	datacamp-fra-2.peering.cz 2001:7f8:7f::200	26.0ms	0%	-	NA
5	datacamp-fra-2.peering.cz 2001:7f8:7f::200	25.1ms	40%	-	NA
6	vl222.fra-drt10-dist-1.cdn77.com 2a02:6ea0:1:6::c3	27.5ms	0%	-	NA
7	*	-	-	-
8	*	-	-	-
9	*	-	0%	-
10	2a0e:b107:dd1::1:1ce7:b8a7	28.5ms	-	AS212508	LOWHOSTING-AS - Lowhosting services of Davide Gennari, IT

Rate-limited ICMPv6: hop 5 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.026ms pmtu 1500
 1:  no reply
 2:  2a01:260:1::225                                       2.785ms 
 3:  2a01-260-1-1--9c.core6.t-2.net                        2.631ms 
 4:  2a01-260-1-1--39.core6.t-2.net                        3.046ms asymm  3 
 5:  vl222.fra-drt10-dist-1.cdn77.com                     22.054ms 
 6:  vl222.fra-drt10-dist-2.cdn77.com                     29.690ms asymm  5 
 7:  no reply
 8:  no reply
 9:  no reply
10:  no reply
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
19:  no reply
20:  no reply
21:  no reply
22:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500