AS60432 ASN-forisp 4ISP SRL

AS overview

Test target: 2a00:8c60:3::1 · static prefix probe · address space: unknown · prefixes announced: 2

prefix(es): 2a00:8c60:2::/48, 2a00:8c60:3::/48

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
`2a00:8c60:3::1`	prb	✓	✓	open	open	-	✓	✓	open	open	-	✓	✓	open	open	-	✓	✓	open	open	-	✓	✗	open	open	-	✓	✗	open	open	-	✓	✓	open	open	-

RPKI & ASPA

2 of 2 prefix(es) covered by a valid ROA.

Prefix	RPKI state	Reason	Covering VRP(s)
`2a00:8c60:2::/48`	✓ valid	matched VRP (correct origin, length within maxLength)	AS60432 /48 maxLen 48 (ripe)
`2a00:8c60:3::/48`	✓ valid	matched VRP (correct origin, length within maxLength)	AS60432 /48 maxLen 48 (ripe)

ASPA: this AS has published an ASPA record listing 1 upstream provider(s) that are authorized to propagate routes from it: AS64445. Routes from this AS that arrive via any other upstream are considered ASPA-invalid by validators that enforce ASPA.

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

We probed 70 arbitrary IPv6 address(es) inside AS60432's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2001:7f8:c5::a506:4445:1 at hop 13 - that router does not answer ICMPv6 Echo. This is not in AS60432's announced prefix; operationally it's the AS-edge / peering interface (often on an IXP peering address or an upstream's /127 link). The traceroute boundary is the AS edge: ICMPv6 Time-Exceeded responses from anything inside this AS are filtered.

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 (1460 B, no Fragment Header). PMTUD does not work toward this address from us.
method: ICMPv6 Echo + forged PTB, tested 2026-09-23T12:01:06Z

Failure detail - what to grep in your logs

vantage	our source	your target	method	result	tested (UTC)
belgrade	`2a09:ab81::91`	`2a00:8c60:3::1`	`icmp6-echo`	not_honored	2026-09-23T12:01:06Z
berlin	`2a06:d1c1:10b::cccc`	`2a00:8c60:3::1`	`icmp6-echo`	not_honored	2026-09-23T12:01:05Z
duseldorf	`2a06:d1c1:10d::aaaa`	`2a00:8c60:3::1`	`icmp6-echo`	not_honored	2026-09-23T12:01:05Z
go6lab	`2a00:8642:42::75`	`2a00:8c60:3::1`	`icmp6-echo`	not_honored	2026-09-23T12:01:44Z
karsolink	`2a12:d8c0:105a:9001::a154`	`2a00:8c60:3::1`	`icmp6-echo`	not_honored	2026-09-23T12:01:03Z
odin	`2607:fae0:a000::42`	`2a00:8c60:3::1`	`icmp6-echo`	not_honored	2026-09-23T12:01:01Z
t2	`2a01:261:313:b814:2a0:98ff:fe5b:13e4`	`2a00:8c60:3::1`	`icmp6-echo`	not_honored	2026-09-23T12:01:04Z

Attempt log (belgrade):

icmp6-echo → not_honored (reply shrank 1460→1460 B)
dns-tcp → no_tcp: connect failed: timed out
tls → not_honored (reply shrank 2698→2698 B)
http → inconclusive (reply 310 B before PTB): natural max segment 310B already <= 1220B; nothing to shrink

Attempt log (berlin):

icmp6-echo → not_honored (reply shrank 1460→1460 B)
dns-tcp → no_tcp: connect failed: timed out
tls → partial (reply shrank 2856→2562 B)
http → inconclusive (reply 310 B before PTB): natural max segment 310B already <= 1220B; nothing to shrink

Attempt log (duseldorf):

icmp6-echo → not_honored (reply shrank 1460→1460 B)
dns-tcp → no_tcp: connect failed: timed out
tls → not_honored (reply shrank 2342→3770 B)
http → inconclusive (reply 310 B before PTB): natural max segment 310B already <= 1220B; nothing to shrink

Attempt log (go6lab):

icmp6-echo → not_honored (reply shrank 1460→1460 B)
dns-tcp → no_tcp: connect failed: timed out
tls → not_honored (reply shrank 2698→2698 B)
http → inconclusive (reply 310 B before PTB): natural max segment 310B already <= 1220B; nothing to shrink

Attempt log (karsolink):

icmp6-echo → not_honored (reply shrank 1460→1460 B)
dns-tcp → no_tcp: connect failed: timed out
tls → not_honored (reply shrank 2698→2698 B)
http → inconclusive (reply 310 B before PTB): natural max segment 310B already <= 1220B; nothing to shrink

Attempt log (odin):

icmp6-echo → not_honored (reply shrank 1460→1460 B)
dns-tcp → no_tcp: connect failed: timed out
tls → not_honored (reply shrank 2416→2698 B)
http → inconclusive (reply 310 B before PTB): natural max segment 310B already <= 1220B; nothing to shrink

Attempt log (t2):

icmp6-echo → not_honored (reply shrank 1460→1460 B)
dns-tcp → no_tcp: connect failed: timed out
tls → partial (reply shrank 2342→1354 B)
http → inconclusive (reply 310 B before PTB): natural max segment 310B 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 1460 B; after, it was 1460 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 (2026-09-23T12:01:06Z) 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

Per-vantage probe + verdict (headline):

belgrade: probe icmp6-echo → verdict not_honored
berlin: probe icmp6-echo → 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	not_honored	no_tcp	partial	inconclusive
duseldorf	not_honored	no_tcp	not_honored	inconclusive
go6lab	not_honored	no_tcp	not_honored	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): AS6939, AS60432, AS64445.

From belgrade (open/Type-2=not_honored) the path enters an opaque hop at hop 8; from berlin (open/Type-2=not_honored) the same hop is in AS6939. Last common AS: AS60432. The disagreement is most likely rooted in one of those two transit ASes.
From belgrade (open/Type-2=not_honored) the path enters an opaque hop at hop 8; from go6lab (open/Type-2=not_honored) the same hop is in AS6939. Last common AS: AS60432. The disagreement is most likely rooted in one of those two transit ASes.
From belgrade (open/Type-2=not_honored) the path enters AS6939 at hop 7; from karsolink (echo_only/Type-2=not_honored) the same hop is in AS60432. Last common AS: AS60432. The disagreement is most likely rooted in one of those two transit ASes.
From belgrade (open/Type-2=not_honored) the path enters AS6939 at hop 7; from odin (echo_only/Type-2=not_honored) the same hop is in an opaque hop. Last common AS: AS60432. The disagreement is most likely rooted in one of those two transit ASes.
From belgrade (open/Type-2=not_honored) the path enters AS6939 at hop 7; from t2 (open/Type-2=not_honored) the same hop is in an opaque hop. Last common AS: AS60432. The disagreement is most likely rooted in one of those two transit ASes.
From berlin (open/Type-2=not_honored) the path enters AS60432 at hop 13; from duseldorf (open/Type-2=not_honored) the same hop is in AS64445. Last common AS: AS60432. The disagreement is most likely rooted in one of those two transit ASes.
From berlin (open/Type-2=not_honored) the path enters AS6939 at hop 6; from karsolink (echo_only/Type-2=not_honored) the same hop is in AS60432. Last common AS: AS60432. The disagreement is most likely rooted in one of those two transit ASes.
From berlin (open/Type-2=not_honored) the path enters AS6939 at hop 7; from odin (echo_only/Type-2=not_honored) the same hop is in an opaque hop. Last common AS: AS60432. The disagreement is most likely rooted in one of those two transit ASes.
From berlin (open/Type-2=not_honored) the path enters AS6939 at hop 7; from t2 (open/Type-2=not_honored) the same hop is in an opaque hop. Last common AS: AS60432. The disagreement is most likely rooted in one of those two transit ASes.
From duseldorf (open/Type-2=not_honored) the path enters AS64445 at hop 13; from go6lab (open/Type-2=not_honored) the same hop is in AS60432. Last common AS: AS60432. The disagreement is most likely rooted in one of those two transit ASes.
From duseldorf (open/Type-2=not_honored) the path enters AS60432 at hop 15; from karsolink (echo_only/Type-2=not_honored) the same hop is in an opaque hop. Last common AS: AS60432. The disagreement is most likely rooted in one of those two transit ASes.
From duseldorf (open/Type-2=not_honored) the path enters AS60432 at hop 15; from odin (echo_only/Type-2=not_honored) the same hop is in an opaque hop. Last common AS: AS60432. The disagreement is most likely rooted in one of those two transit ASes.
From duseldorf (open/Type-2=not_honored) the path enters AS60432 at hop 15; from t2 (open/Type-2=not_honored) the same hop is in an opaque hop. Last common AS: AS60432. The disagreement is most likely rooted in one of those two transit ASes.
From go6lab (open/Type-2=not_honored) the path enters AS31500 at hop 5; from karsolink (echo_only/Type-2=not_honored) the same hop is in AS64445. Last common AS: AS60432. The disagreement is most likely rooted in one of those two transit ASes.
From go6lab (open/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: AS60432. The disagreement is most likely rooted in one of those two transit ASes.
From go6lab (open/Type-2=not_honored) the path enters AS31500 at hop 5; from t2 (open/Type-2=not_honored) the same hop is in AS6939. Last common AS: AS60432. The disagreement is most likely rooted in one of those two transit ASes.
From karsolink (echo_only/Type-2=not_honored) the path enters AS60432 at hop 6; from odin (echo_only/Type-2=not_honored) the same hop is in AS6939. Last common AS: AS60432. The disagreement is most likely rooted in one of those two transit ASes.
From karsolink (echo_only/Type-2=not_honored) the path enters AS64445 at hop 5; from t2 (open/Type-2=not_honored) the same hop is in AS6939. Last common AS: AS60432. The disagreement is most likely rooted in one of those two transit ASes.
From odin (echo_only/Type-2=not_honored) the path enters an opaque hop at hop 5; from t2 (open/Type-2=not_honored) the same hop is in AS6939. Last common AS: AS60432. 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) openRFC 4890 ✗

filter likely at: (none) · min PMTU on path: 1500

4/4

Echo small (56B) 60.0ms

4/4

Echo 1500B (DF) 60.0ms

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	0.3ms	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	0.3ms	0%	AS13004	SOX - Serbian Open Exchange DOO, RS
4	2001:67c:128c::699	17.9ms	0%	-	NA
5	hu0-15-0-0.lontr4.London.opentransit.net 2001:688:0:2::c3	41.4ms	0%	AS5511	Opentransit - Orange S.A., FR
6	*	-	-	-
7	be4.core2.ams2.he.net 2001:470:0:293::2	42.1ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
8	*	-	30%	-
9	be3.core4.fra1.he.net 2001:470:e:5a::2	50.7ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
10	be10.core1.zrh2.he.net 2001:470:e:153::2	43.2ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
11	be1.core1.mil2.he.net 2001:470:e:dd::1	45.2ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
12	*	-	-	-
13	netjoin.minap.it 2001:7f8:c5::a506:4445:1	48.8ms	0%	AS64445	NetJoin
14	2a12:e6c0:0:5::2	50.0ms	0%	AS64445	AS-NETJOIN - NetJoin srl, IT
15	2a00:8c60:2:9::1	49.8ms	0%	AS60432	ASN-forisp - 4ISP SRL, IT
16	2a00:8c60:3:3::1	50.0ms	0%	AS60432	ASN-forisp - 4ISP SRL, IT
17	*	-	0%	-
18	*	-	-	-
19	*	-	-	-
20	*	-	-	-
21	*	-	-	-
22	*	-	-	-

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

tracepath -6

 1?: [LOCALHOST]                        0.014ms pmtu 1500
 1:  _gateway                                              0.350ms 
 1:  _gateway                                              0.838ms 
 2:  sox-pn.sox.rs                                         0.395ms 
 3:  2001:7f8:1e:8::3d                                     0.749ms asymm  2 
 4:  2001:67c:128c::699                                   19.757ms 
 5:  hu0-15-0-0.lontr4.London.opentransit.net             40.730ms asymm  6 
 6:  no reply
 7:  be4.core2.ams2.he.net                                41.661ms 
 8:  be1.core2.fra2.he.net                                41.277ms asymm  6 
 9:  be3.core4.fra1.he.net                                41.339ms asymm  7 
10:  be10.core1.zrh2.he.net                               47.701ms asymm  8 
11:  be1.core1.mil2.he.net                                45.145ms asymm  7 
12:  no reply
13:  netjoin.minap.it                                     51.546ms asymm  6 
14:  2a12:e6c0:0:5::2                                     49.997ms asymm  7 
15:  2a00:8c60:2:9::1                                     50.131ms asymm  8 
16:  2a00:8c60:3:3::1                                     51.644ms asymm  9 
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) openRFC 4890 ✗

filter likely at: (none) · min PMTU on path: 1500

4/4

Echo small (56B) 32.9ms

4/4

Echo 1500B (DF) 33.0ms

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	0.9ms	0%*	AS59645	WYBT-NET - Tobias Fiebig, DE
3	hurricane-electric.bcix.de 2001:7f8:19:1::1b1b:1	17.1ms	0%	-	NA
4	*	-	-	-
5	be47.core1.prg1.he.net 2001:470:e:67::2	14.7ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
6	be8.core4.fra1.he.net 2001:470:e:1e::1	15.9ms	60%	AS6939	HURRICANE - Hurricane Electric LLC, US
7	be10.core1.zrh2.he.net 2001:470:e:153::2	20.0ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
8	be1.core1.mil2.he.net 2001:470:e:dd::1	78.1ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
9	*	-	-	-
10	netjoin.minap.it 2001:7f8:c5::a506:4445:1	21.7ms	0%	AS64445	NetJoin
11	2a12:e6c0:0:5::2	21.6ms	0%	AS64445	AS-NETJOIN - NetJoin srl, IT
12	2a00:8c60:2:9::1	21.6ms	0%	AS60432	ASN-forisp - 4ISP SRL, IT
13	2a00:8c60:3:3::1	21.7ms	0%	AS60432	ASN-forisp - 4ISP SRL, IT
14	*	-	0%	-
15	*	-	-	-
16	*	-	-	-
17	*	-	-	-
18	*	-	-	-
19	*	-	-	-
20	*	-	-	-
21	*	-	-	-
22	*	-	-	-

Rate-limited ICMPv6: hop 6 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.023ms pmtu 1500
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.445ms 
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.388ms 
 2:  ae0-2453.cr10.ber01.lwlcom.net                        0.859ms 
 3:  hurricane-electric.bcix.de                           16.625ms asymm  6 
 4:  no reply
 5:  be47.core1.prg1.he.net                               17.116ms asymm  6 
 6:  be8.core4.fra1.he.net                                16.196ms asymm  5 
 7:  be10.core1.zrh2.he.net                               22.061ms asymm  6 
 8:  be1.core1.mil2.he.net                                24.748ms asymm  7 
 9:  no reply
10:  netjoin.minap.it                                     22.486ms 
11:  2a12:e6c0:0:5::2                                     22.322ms 
12:  2a00:8c60:2:9::1                                     22.077ms 
13:  2a00:8c60:3:3::1                                     22.452ms 
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) openRFC 4890 ✗

filter likely at: (none) · min PMTU on path: 1500

4/4

Echo small (56B) 31.7ms

4/4

Echo 1500B (DF) 31.7ms

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	1.3ms	0%	AS24961	MYLOC-AS - WIIT AG, DE
3	lag13.agr3-dus3.bb.wiit.network 2001:4ba0:ffe9:7d::1	67.1ms	0%	AS24961	MYLOC-AS - WIIT AG, DE
4	lag30.core3-dus1.bb.wiit.network 2001:4ba0:ffe9:109::2	0.2ms	0%	AS24961	MYLOC-AS - WIIT AG, DE
5	lag0-vl1011.core1-fra-ix.bb.wiit.network 2001:4ba0:ffe9:8a::2	4.3ms	0%	AS24961	MYLOC-AS - WIIT AG, DE
6	lag0-vl1001.core1-nbg-ncd.bb.wiit.network 2001:4ba0:ffe9:103e::1	7.1ms	0%	AS24961	MYLOC-AS - WIIT AG, DE
7	lag0-vl6.core2-nbg-ncd.bb.wiit.network 2001:4ba0:ffe9:103b::1	7.1ms	0%	AS24961	MYLOC-AS - WIIT AG, DE
8	2001:4ba0:ffe9:b8	14.1ms	0%	-
9	lag0-vl1009.core1-muc-eq3.bb.wiit.network 2001:4ba0:ffe9:a7::1	14.0ms	0%	AS24961	MYLOC-AS - WIIT AG, DE
10	lag0-vl1001.core1-pda-vsix.bb.wiit.network 2001:4ba0:ffe9:da::2	22.8ms	0%	AS24961	MYLOC-AS - WIIT AG, DE
11	lag0-vl1001.core1-mil-mix.bb.wiit.network 2001:4ba0:ffe9:db::2	21.9ms	0%	AS24961	MYLOC-AS - WIIT AG, DE
12	lag0-vl5.core3-mil-irid.bb.wiit.network 2001:4ba0:ffe9:9a::2	20.1ms	0%	AS24961	MYLOC-AS - WIIT AG, DE
13	netjoin.minap.it 2001:7f8:c5::a506:4445:1	20.0ms	0%	AS64445	NetJoin
14	2a12:e6c0:0:5::2	20.3ms	0%	AS64445	AS-NETJOIN - NetJoin srl, IT
15	2a00:8c60:2:9::1	20.2ms	0%	AS60432	ASN-forisp - 4ISP SRL, IT
16	2a00:8c60:3:3::1	20.2ms	0%	AS60432	ASN-forisp - 4ISP SRL, IT
17	*	-	0%	-
18	*	-	-	-
19	*	-	-	-
20	*	-	-	-
21	*	-	-	-
22	*	-	-	-

tracepath -6

 1?: [LOCALHOST]                        0.011ms pmtu 1500
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.276ms 
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.283ms 
 2:  eth1-0-12-h5594.edge5-dus1.bb.wiit.network            1.502ms 
 3:  no reply
 4:  lag30.core3-dus1.bb.wiit.network                      0.327ms 
 5:  lag0-vl1011.core1-fra-ix.bb.wiit.network              4.472ms 
 6:  lag0-vl1001.core1-nbg-ncd.bb.wiit.network             7.000ms 
 7:  lag0-vl6.core2-nbg-ncd.bb.wiit.network                7.003ms 
 8:  lag0-vl1006.core2-muc2.bb.wiit.network                9.930ms 
 9:  lag0-vl1009.core1-muc-eq3.bb.wiit.network            10.051ms 
10:  lag0-vl1001.core1-pda-vsix.bb.wiit.network           20.385ms 
11:  lag0-vl1001.core1-mil-mix.bb.wiit.network            20.263ms asymm  9 
12:  lag0-vl5.core3-mil-irid.bb.wiit.network              20.210ms asymm  8 
13:  netjoin.minap.it                                     20.211ms asymm  9 
14:  2a12:e6c0:0:5::2                                     20.265ms asymm 10 
15:  2a00:8c60:2:9::1                                     20.443ms asymm 11 
16:  2a00:8c60:3:3::1                                     20.502ms asymm 12 
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) openRFC 4890 ✗

filter likely at: (none) · min PMTU on path: 1500

4/4

Echo small (56B) 48.9ms

4/4

Echo 1500B (DF) 48.6ms

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	0.8ms	0%	AS203993	GNA-DC1-AS - S.J.M. Steffann, NL
2	gw.friends.steffann.nl 2a00:8642:1000:f000::1	3.1ms	0%*	AS203993	GNA-DC1-AS - S.J.M. Steffann, NL
3	2a00:1ca8:1::194	4.3ms	0%	AS50673	Serverius-as - Serverius Holding B.V., NL
4	2a03:3f40::10:41	3.2ms	0%	AS50673	Serverius-as - Serverius Holding B.V., NL
5	2001:b28:3ff::1b1b:0:1	32.9ms	0%	AS31500	GNM-AS - Global Network Management Inc, AG
6	be9.core4.fra1.he.net 2001:470:e:e9::1	32.5ms	50%	AS6939	HURRICANE - Hurricane Electric LLC, US
7	be10.core1.zrh2.he.net 2001:470:e:153::2	36.0ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
8	be1.core1.mil2.he.net 2001:470:e:dd::1	38.2ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
9	*	-	-	-
10	netjoin.minap.it 2001:7f8:c5::a506:4445:1	36.5ms	0%	AS64445	NetJoin
11	2a12:e6c0:0:5::2	167.4ms	0%	AS64445	AS-NETJOIN - NetJoin srl, IT
12	2a00:8c60:2:9::1	37.5ms	0%	AS60432	ASN-forisp - 4ISP SRL, IT
13	2a00:8c60:3:3::1	36.9ms	0%	AS60432	ASN-forisp - 4ISP SRL, IT
14	*	-	0%	-
15	*	-	-	-
16	*	-	-	-
17	*	-	-	-
18	*	-	-	-
19	*	-	-	-
20	*	-	-	-
21	*	-	-	-
22	*	-	-	-

Rate-limited ICMPv6: hop 6 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.058ms pmtu 1500
 1:  2a00:8642:42::2                                       1.912ms 
 1:  2a00:8642:42::2                                       4.239ms 
 2:  gw.friends.steffann.nl                                2.914ms 
 3:  2a00:1ca8:1::194                                      3.630ms 
 4:  2a03:3f40::10:41                                      5.240ms 
 5:  2001:b28:3ff::1b1b:0:1                               28.198ms 
 6:  be6.core4.fra1.he.net                                32.469ms asymm  4 
 7:  be10.core1.zrh2.he.net                               36.556ms asymm  5 
 8:  be1.core1.mil2.he.net                                40.283ms asymm  6 
 9:  no reply
10:  netjoin.minap.it                                     38.969ms asymm  8 
11:  2a12:e6c0:0:5::2                                     40.507ms asymm  9 
12:  2a00:8c60:2:9::1                                     37.590ms asymm 10 
13:  2a00:8c60:3:3::1                                     40.056ms asymm 11 
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 ITA host (Karsolink) echo onlyRFC 4890 ✗

filter likely at: destination AS60432 (ASN-forisp) · min PMTU on path: 1500

4/4

Echo small (56B) 19.8ms

0/4

Echo 1500B (DF) -

Type 1 dest-unreach

443,80

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	*	-	0%*	-
2	*	-	-	-
3	*	-	-	-
4	2001:7f8:b9::48:1	8.3ms	0%	-	NA
5	2a12:e6c0:0:5::2	7.5ms	0%	AS64445	AS-NETJOIN - NetJoin srl, IT
6	2a00:8c60:2:9::1	7.5ms	0%	AS60432	ASN-forisp - 4ISP SRL, IT
7	2a00:8c60:3:3::1	8.5ms	0%	AS60432	ASN-forisp - 4ISP SRL, IT
8	*	-	0%	-
9	*	-	-	-
10	*	-	-	-
11	*	-	-	-
12	*	-	-	-
13	*	-	-	-
14	*	-	-	-
15	*	-	-	-
16	*	-	-	-
17	*	-	-	-
18	*	-	-	-
19	*	-	-	-
20	*	-	-	-
21	*	-	-	-
22	*	-	-	-

tracepath -6

 1?: [LOCALHOST]                        0.028ms pmtu 1500
 1:  karsolink-01.net.karsolink.com                        1.005ms 
 1:  karsolink-01.net.karsolink.com                        0.871ms 
 2:  no reply
 3:  no reply
 4:  2001:7f8:b9::48:1                                     8.069ms 
 5:  2a12:e6c0:0:5::2                                      7.974ms 
 6:  2a00:8c60:2:9::1                                      8.253ms 
 7:  2a00:8c60:3:3::1                                      8.074ms 
 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 SLO host (6connect) echo onlyRFC 4890 ✗

filter likely at: destination AS60432 (ASN-forisp) · min PMTU on path: 1500

4/4

Echo small (56B) 23.5ms

0/4

Echo 1500B (DF) -

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	0.3ms	0%*	AS8038	6CONNECT - 6connect, Inc., US
2	ccr-to-fw-ccr1-gw-lju.6connect.com 2607:fae0:a000:2::2	1.0ms	-	AS8038	6CONNECT - 6connect, Inc., US
3	2a03:a100:0:201:1::1	1.0ms	10%	AS56635	XENYA - XENYA inzeniring, proizvodnja in trgovina, d.o.o. Ljubljana, SI
4	e0-1.core1.lju1.he.net 2001:470:1:5be::1	1.9ms	90%	AS6939	HURRICANE - Hurricane Electric LLC, US
5	*	-	-	-
6	port-channel1.core1.zag2.he.net 2001:470:0:2ea::2	4.2ms	10%	AS6939	HURRICANE - Hurricane Electric LLC, US
7	*	-	-	-
8	netjoin.minap.it 2001:7f8:c5::a506:4445:1	12.2ms	0%	AS64445	NetJoin
9	2a12:e6c0:0:5::2	12.3ms	0%	AS64445	AS-NETJOIN - NetJoin srl, IT
10	2a00:8c60:2:9::1	12.5ms	0%	AS60432	ASN-forisp - 4ISP SRL, IT
11	2a00:8c60:3:3::1	12.3ms	0%	AS60432	ASN-forisp - 4ISP SRL, IT
12	*	-	0%	-
13	*	-	-	-
14	*	-	-	-
15	*	-	-	-
16	*	-	-	-
17	*	-	-	-
18	*	-	-	-
19	*	-	-	-
20	*	-	-	-
21	*	-	-	-
22	*	-	-	-

Rate-limited ICMPv6: hop 3, hop 4, hop 6 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.198ms pmtu 9000
 1:  fw1-lju.6connect.com                                  0.438ms 
 1:  fw1-lju.6connect.com                                  0.501ms 
 2:  no reply
 3:  2a03:a100:0:201:1::1                                  1.145ms 
 4:  2a03:a100:0:201:1::1                                  0.884ms pmtu 1500
 4:  e0-1.core1.lju1.he.net                                2.375ms 
 5:  no reply
 6:  port-channel1.core1.zag2.he.net                       4.440ms 
 7:  no reply
 8:  netjoin.minap.it                                     12.225ms 
 9:  2a12:e6c0:0:5::2                                     12.130ms 
10:  2a00:8c60:2:9::1                                     12.312ms 
11:  2a00:8c60:3:3::1                                     12.416ms 
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) openRFC 4890 ✗

filter likely at: (none) · min PMTU on path: 1500

4/4

Echo small (56B) 26.3ms

4/4

Echo 1500B (DF) 27.2ms

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	13.0ms	0%*	AS34779	T-2-AS - T-2, d.o.o., SI
3	2a01-260-1-1--9c.core6.t-2.net 2a01:260:1:1::9c	2.9ms	0%*	AS34779	T-2-AS - T-2, d.o.o., SI
4	2a01-260-1-1--38.core6.t-2.net 2a01:260:1:1::38	2.1ms	0%*	AS34779	T-2-AS - T-2, d.o.o., SI
5	port-channel1.core1.zag2.he.net 2001:470:0:2ea::2	10.8ms	-	AS6939	HURRICANE - Hurricane Electric LLC, US
6	port-channel1.core1.zag2.he.net 2001:470:0:2ea::2	10.9ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
7	*	-	-	-
8	2a12:e6c0:0:5::2	16.3ms	0%	AS64445	AS-NETJOIN - NetJoin srl, IT
9	2a12:e6c0:0:5::2	16.0ms	0%	AS64445	AS-NETJOIN - NetJoin srl, IT
10	2a00:8c60:2:9::1	16.2ms	0%	AS60432	ASN-forisp - 4ISP SRL, IT
11	2a00:8c60:3:3::1	16.2ms	0%	AS60432	ASN-forisp - 4ISP SRL, IT
12	*	-	0%	-
13	*	-	-	-
14	*	-	-	-
15	*	-	-	-
16	*	-	-	-
17	*	-	-	-
18	*	-	-	-
19	*	-	-	-
20	*	-	-	-
21	*	-	-	-
22	*	-	-	-

tracepath -6

 1?: [LOCALHOST]                        0.026ms pmtu 1500
 1:  2a01:261:313:b814::1                                  0.984ms 
 1:  2a01:261:313:b814::1                                  0.970ms 
 2:  2a01:260:1::225                                       5.975ms 
 3:  2a01-260-1-1--9c.core6.t-2.net                        2.803ms 
 4:  2a01-260-1-1--38.core6.t-2.net                        2.797ms asymm  3 
 5:  port-channel1.core1.zag2.he.net                      10.727ms asymm  7 
 6:  port-channel1.core1.zag2.he.net                       9.573ms asymm  7 
 7:  netjoin.minap.it                                     17.475ms 
 8:  netjoin.minap.it                                     17.766ms asymm  7 
 9:  ???                                                  16.513ms 
10:  2a00:8c60:2:9::1                                     15.880ms asymm  9 
11:  2a00:8c60:3:3::1                                     17.239ms asymm 10 
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