AS61075 ROCKETNG Rocket NG GmbH

AS overview

Test target: 2a0c:b5c0::12 · www.rocket-ng.at · address space: PA · prefixes announced: 1

prefix(es): 2a0c:b5c0::/29

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
`2a0c:b5c0::12` www.rocket-ng.at	whois	✓	✓	open	open	-	✓	✓	open	open	-	✓	✓	open	open	-	✓	✓	open	open	-	✓	✗	open	open	-	✓	✓	open	open	-	✓	✓	open	open	-

VIX / AAIX / SAIX / TIROL-IX / ERA-IX peering

Not an VIX / AAIX / SAIX / TIROL-IX / ERA-IX member, but our traceroute path crosses the VIX / AAIX / SAIX / TIROL-IX / ERA-IX LAN from SRB host (SOX, Belgrade) - reached via an VIX / AAIX / SAIX / TIROL-IX / ERA-IX-resident transit operator.

RPKI & ASPA

1 of 1 prefix(es) covered by a valid ROA.

Prefix	RPKI state	Reason	Covering VRP(s)
`2a0c:b5c0::/29`	✓ valid	matched VRP (correct origin, length within maxLength)	AS59909 /29 maxLen 32 (ripe); AS61075 /29 maxLen 32 (ripe)

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

At least one router inside AS61075's announced prefix replied during the random-target probe. Hop(s): 2a0c:b5c0::4. 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 (1460 B, no Fragment Header). PMTUD does not work toward this address from us.
method: ICMPv6 Echo + forged PTB, tested 2026-09-24T13:33:24Z

Failure detail - what to grep in your logs

vantage	our source	your target	method	result	tested (UTC)
belgrade	`2a09:ab81::91`	`2a0c:b5c0::12`	`icmp6-echo`	not_honored	2026-09-24T13:33:24Z
berlin	`2a06:d1c1:10b::cccc`	`2a0c:b5c0::12`	`icmp6-echo`	not_honored	2026-09-24T13:33:26Z
duseldorf	`2a06:d1c1:10d::aaaa`	`2a0c:b5c0::12`	`icmp6-echo`	not_honored	2026-09-24T13:33:29Z
go6lab	`2a00:8642:42::75`	`2a0c:b5c0::12`	`icmp6-echo`	not_honored	2026-09-24T13:34:12Z
karsolink	`2a12:d8c0:105a:9001::a154`	`2a0c:b5c0::12`	`icmp6-echo`	not_honored	2026-09-24T13:33:18Z
odin	`2607:fae0:a000::42`	`2a0c:b5c0::12`	`icmp6-echo`	not_honored	2026-09-24T13:33:28Z
t2	`2a01:261:313:b814:2a0:98ff:fe5b:13e4`	`2a0c:b5c0::12`	`icmp6-echo`	not_honored	2026-09-24T13:33:26Z

Attempt log (belgrade):

icmp6-echo → not_honored (reply shrank 1460→1460 B)
dns-tcp → no_tcp: connect failed: timed out
tls → partial (reply shrank 4096→2416 B)
http → inconclusive (reply 233 B before PTB): natural max segment 233B 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 → not_honored (reply shrank 4096→4096 B)
http → inconclusive (reply 233 B before PTB): natural max segment 233B 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 → partial (reply shrank 2668→2416 B)
http → inconclusive (reply 233 B before PTB): natural max segment 233B 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 4096→4096 B)
http → inconclusive (reply 233 B before PTB): natural max segment 233B 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 4096→4096 B)
http → inconclusive (reply 233 B before PTB): natural max segment 233B 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 4096→4096 B)
http → inconclusive (reply 233 B before PTB): natural max segment 233B 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 2856→2416 B)
http → inconclusive (reply 233 B before PTB): natural max segment 233B 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 (2026-09-24T13:33:24Z) 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	partial	inconclusive
berlin	not_honored	no_tcp	not_honored	inconclusive
duseldorf	not_honored	no_tcp	partial	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): AS201011, AS6939, AS1764.

From belgrade (open/Type-2=not_honored) the path enters AS61075 at hop 8; from berlin (open/Type-2=not_honored) the same hop is in AS201011. Last common AS: no shared transit. The disagreement is most likely rooted in one of those two transit ASes.
From belgrade (open/Type-2=not_honored) the path enters AS61075 at hop 8; from duseldorf (open/Type-2=not_honored) the same hop is in AS201011. Last common AS: no shared transit. The disagreement is most likely rooted in one of those two transit ASes.
From belgrade (open/Type-2=not_honored) the path enters AS1764 at hop 6; from go6lab (open/Type-2=not_honored) the same hop is in AS6939. Last common AS: AS1764. The disagreement is most likely rooted in one of those two transit ASes.
From belgrade (open/Type-2=not_honored) the path enters AS1764 at hop 6; from karsolink (echo_only/Type-2=not_honored) the same hop is in AS6939. Last common AS: AS61075. The disagreement is most likely rooted in one of those two transit ASes.
From belgrade (open/Type-2=not_honored) the path enters AS1764 at hop 6; from odin (open/Type-2=not_honored) the same hop is in AS201011. Last common AS: no shared transit. The disagreement is most likely rooted in one of those two transit ASes.
From belgrade (open/Type-2=not_honored) the path enters AS1764 at hop 6; from t2 (open/Type-2=not_honored) the same hop is in AS201011. Last common AS: no shared transit. The disagreement is most likely rooted in one of those two transit ASes.
From berlin (open/Type-2=not_honored) the path enters AS201011 at hop 9; from go6lab (open/Type-2=not_honored) the same hop is in AS1764. Last common AS: no shared transit. The disagreement is most likely rooted in one of those two transit ASes.
From berlin (open/Type-2=not_honored) the path enters AS201011 at hop 8; from karsolink (echo_only/Type-2=not_honored) the same hop is in AS6939. Last common AS: no shared transit. The disagreement is most likely rooted in one of those two transit ASes.
From berlin (open/Type-2=not_honored) the path enters AS201011 at hop 10; from odin (open/Type-2=not_honored) the same hop is in an opaque hop. Last common AS: AS201011. The disagreement is most likely rooted in one of those two transit ASes.
From berlin (open/Type-2=not_honored) the path enters AS201011 at hop 12; from t2 (open/Type-2=not_honored) the same hop is in an opaque hop. Last common AS: AS201011. The disagreement is most likely rooted in one of those two transit ASes.
From duseldorf (open/Type-2=not_honored) the path enters AS201011 at hop 9; from go6lab (open/Type-2=not_honored) the same hop is in AS1764. Last common AS: no shared transit. The disagreement is most likely rooted in one of those two transit ASes.
From duseldorf (open/Type-2=not_honored) the path enters AS201011 at hop 8; from karsolink (echo_only/Type-2=not_honored) the same hop is in AS6939. Last common AS: no shared transit. The disagreement is most likely rooted in one of those two transit ASes.
From duseldorf (open/Type-2=not_honored) the path enters AS201011 at hop 10; from odin (open/Type-2=not_honored) the same hop is in an opaque hop. Last common AS: AS201011. The disagreement is most likely rooted in one of those two transit ASes.
From duseldorf (open/Type-2=not_honored) the path enters AS201011 at hop 12; from t2 (open/Type-2=not_honored) the same hop is in an opaque hop. Last common AS: AS201011. The disagreement is most likely rooted in one of those two transit ASes.
From go6lab (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 an opaque hop. Last common AS: AS1764. 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 4; from odin (open/Type-2=not_honored) the same hop is in AS5603. Last common AS: no shared transit. The disagreement is most likely rooted in one of those two transit ASes.
From go6lab (open/Type-2=not_honored) the path enters AS6939 at hop 6; from t2 (open/Type-2=not_honored) the same hop is in AS201011. Last common AS: no shared transit. The disagreement is most likely rooted in one of those two transit ASes.
From karsolink (echo_only/Type-2=not_honored) the path enters AS6939 at hop 6; from odin (open/Type-2=not_honored) the same hop is in AS201011. Last common AS: no shared transit. The disagreement is most likely rooted in one of those two transit ASes.
From karsolink (echo_only/Type-2=not_honored) the path enters AS6939 at hop 5; from t2 (open/Type-2=not_honored) the same hop is in AS201011. Last common AS: no shared transit. The disagreement is most likely rooted in one of those two transit ASes.
From odin (open/Type-2=not_honored) the path enters an opaque hop at hop 10; from t2 (open/Type-2=not_honored) the same hop is in AS201011. Last common AS: AS201011. 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) 28.5ms

4/4

Echo 1500B (DF) 28.5ms

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	0.5ms	0%*	AS60733	PERKE-NET - ZORAN PEROVIC trading as Agencija Perke.NET, RS
2	sox-pn.sox.rs 2001:7f8:1e:8::3a	0.2ms	0%	AS13004	SOX - Serbian Open Exchange DOO, RS
3	2001:7f8:1e:8::3d	0.4ms	0%	AS13004	SOX - Serbian Open Exchange DOO, RS
4	2a02:2d8:0:a00e:232a	12.7ms	40%	-
5	vix-ip6-et-0-1-2-0-r60.inx.vie.at.nextlayer.net @VIX / AAIX / SAIX / TIROL-IX / ERA-IX 2001:7f8:30:0:2:1:0:1764	12.8ms	0%	-	NA
6	ip6-ae2-0-r28.esh.vie.nextlayer.net 2a01:190:1764:8010::1	13.0ms	0%	AS1764	NEXTLAYER-AS - Next Layer Telekommunikationsdienstleistungs- und Beratungs GmbH, AT
7	2a01:190:15ff:5c::2	13.2ms	0%	AS1764	NEXTLAYER-AS - Next Layer Telekommunikationsdienstleistungs- und Beratungs GmbH, AT
8	2a0c:b5c0::4	32.1ms	0%	AS61075	ROCKETNG - Rocket NG GmbH, AT
9	*	-	0%	-
10	*	-	-	-
11	*	-	-	-
12	*	-	-	-
13	*	-	-	-
14	*	-	-	-
15	*	-	-	-
16	*	-	-	-
17	*	-	-	-
18	*	-	-	-

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

tracepath -6

 1?: [LOCALHOST]                        0.016ms pmtu 1500
 1:  _gateway                                              0.777ms 
 1:  _gateway                                              0.626ms 
 2:  sox-pn.sox.rs                                         0.599ms 
 3:  2001:7f8:1e:8::3d                                     0.616ms asymm  2 
 4:  ae8-930.RT.IRX.VIE.AT.retn.net                       12.874ms asymm  3 
 5:  vix-ip6-et-0-1-2-0-r60.inx.vie.at.nextlayer.net      12.925ms asymm  3 
 6:  ip6-ae1-0-r28.esh.vie.nextlayer.net                  11.919ms 
 7:  2a01:190:15ff:5c::2                                  16.860ms 
 8:  2a0c:b5c0::4                                         30.277ms asymm 14 
 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
     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) 24.1ms

4/4

Echo 1500B (DF) 24.1ms

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	0.2ms	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	5.0ms	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	5.1ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
6	ae4-2087.dus10.core-backbone.com 2a01:4a0:0:2087::33	11.4ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
7	ae21-2071.fra10.core-backbone.com 2a01:4a0:0:2071::4	10.6ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
8	ae2-2021.fra20.core-backbone.com 2a01:4a0:0:2021::4	10.6ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
9	ae6-2003.nbg20.core-backbone.com 2a01:4a0:0:2003::2	12.0ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
10	ae2-2032.muc20.core-backbone.com 2a01:4a0:0:2032::7	14.5ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
11	ae1-2028.vie10.core-backbone.com 2a01:4a0:0:2028::10	20.2ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
12	2a01:4a0:1338:22::2	26.0ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
13	*	-	0%	-
14	*	-	-	-
15	*	-	-	-
16	*	-	-	-
17	*	-	-	-
18	*	-	-	-

tracepath -6

 1?: [LOCALHOST]                        0.033ms pmtu 1500
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.748ms 
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.702ms 
 2:  ae0-2453.cr10.ber01.lwlcom.net                        1.099ms 
 3:  ae3-90.cr10.ham01.lwlcom.net                          5.104ms 
 4:  ae0-50.cr11.ham01.lwlcom.net                          5.068ms 
 5:  2a00:c380:f000::4b                                    5.648ms asymm  4 
 6:  ae4-2087.dus10.core-backbone.com                     11.904ms asymm  5 
 7:  ae21-2071.fra10.core-backbone.com                    11.082ms asymm  5 
 8:  ae2-2021.fra20.core-backbone.com                     11.115ms asymm  4 
 9:  ae6-2003.nbg20.core-backbone.com                     12.322ms asymm  6 
10:  ae2-2032.muc20.core-backbone.com                     15.306ms asymm  7 
11:  ae1-2028.vie10.core-backbone.com                     20.718ms asymm  8 
12:  2a01:4a0:1338:22::2                                  26.912ms asymm 14 
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  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) 16.4ms

4/4

Echo 1500B (DF) 16.4ms

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	0.3ms	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	lag30.core3-dus1.bb.wiit.network 2001:4ba0:ffe9:109::2	0.2ms	0%	AS24961	MYLOC-AS - WIIT AG, DE
5	lag2.core1-dus-ix.bb.wiit.network 2001:4ba0:ffe9:4f::1	0.4ms	0%	AS24961	MYLOC-AS - WIIT AG, DE
6	core-backbone-dus-gw.bb.wiit.network 2001:4ba0:ffe9:44::2	10.3ms	0%	AS24961	MYLOC-AS - WIIT AG, DE
7	ae21-2071.fra10.core-backbone.com 2a01:4a0:0:2071::4	9.6ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
8	ae2-2021.fra20.core-backbone.com 2a01:4a0:0:2021::4	9.5ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
9	ae6-2003.nbg20.core-backbone.com 2a01:4a0:0:2003::2	10.8ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
10	ae2-2032.muc20.core-backbone.com 2a01:4a0:0:2032::7	13.3ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
11	ae1-2028.vie10.core-backbone.com 2a01:4a0:0:2028::10	18.7ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
12	2a01:4a0:1338:22::2	19.0ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
13	*	-	0%	-
14	*	-	-	-
15	*	-	-	-
16	*	-	-	-
17	*	-	-	-
18	*	-	-	-

tracepath -6

 1?: [LOCALHOST]                        0.030ms pmtu 1500
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.380ms 
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.311ms 
 2:  eth1-0-12-h5594.edge5-dus1.bb.wiit.network            1.454ms 
 3:  no reply
 4:  lag11.core3-dus1.bb.wiit.network                      0.330ms 
 5:  lag2.core1-dus-ix.bb.wiit.network                     0.687ms 
 6:  core-backbone-dus-gw.bb.wiit.network                 10.494ms 
 7:  ae21-2071.fra10.core-backbone.com                     9.809ms asymm  6 
 8:  ae2-2021.fra20.core-backbone.com                      9.742ms asymm  5 
 9:  ae6-2003.nbg20.core-backbone.com                     11.004ms asymm  7 
10:  ae2-2032.muc20.core-backbone.com                     13.491ms asymm  8 
11:  ae1-2028.vie10.core-backbone.com                     19.123ms asymm  9 
12:  2a01:4a0:1338:22::2                                  15.828ms asymm 13 
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  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) 41.3ms

4/4

Echo 1500B (DF) 41.5ms

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	6.7ms	0%*	AS203993	GNA-DC1-AS - S.J.M. Steffann, NL
3	2a00:1ca8:1::194	5.0ms	0%	AS50673	Serverius-as - Serverius Holding B.V., NL
4	2a03:3f40::10:41	5.0ms	0%	AS50673	Serverius-as - Serverius Holding B.V., NL
5	*	-	70%	-
6	be2.core1.cph1.he.net 2001:470:e:5f::1	28.9ms	-	AS6939	HURRICANE - Hurricane Electric LLC, US
7	be7.core3.ams1.he.net 2001:470:e:74::1	29.6ms	-	AS6939	HURRICANE - Hurricane Electric LLC, US
8	*	-	0%	-
9	ip6-ae2-0-r28.esh.vie.nextlayer.net 2a01:190:1764:8010::1	45.2ms	0%	AS1764	NEXTLAYER-AS - Next Layer Telekommunikationsdienstleistungs- und Beratungs GmbH, AT
10	2a01:190:15ff:5c::2	46.4ms	0%	AS1764	NEXTLAYER-AS - Next Layer Telekommunikationsdienstleistungs- und Beratungs GmbH, AT
11	2a01:190:15ff:5c::2	45.6ms	0%	AS1764	NEXTLAYER-AS - Next Layer Telekommunikationsdienstleistungs- und Beratungs GmbH, AT
12	*	-	0%	-
13	*	-	-	-
14	*	-	-	-
15	*	-	-	-
16	*	-	-	-
17	*	-	-	-
18	*	-	-	-

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

tracepath -6

 1?: [LOCALHOST]                        0.057ms pmtu 1500
 1:  2a00:8642:42::2                                       3.795ms 
 1:  2a00:8642:42::2                                       1.405ms 
 2:  gw.friends.steffann.nl                                5.752ms 
 3:  2a00:1ca8:1::194                                      4.426ms 
 4:  2a03:3f40::10:41                                      3.963ms 
 5:  2001:b28:3ff::1b1b:0:1                               29.109ms 
 6:  be2.core1.cph1.he.net                                29.256ms asymm  4 
 7:  be7.core3.ams1.he.net                                30.263ms asymm  3 
 8:  de-cix.r60.inx.fra.de.nextlayer.net                  41.989ms 
 9:  ip6-ae2-0-r28.esh.vie.nextlayer.net                  43.498ms asymm 10 
10:  2a01:190:15ff:5c::2                                  41.743ms asymm 11 
11:  2a01:190:15ff:5c::2                                  43.994ms 
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500

From ITA host (Karsolink) echo onlyRFC 4890 ✗

filter likely at: destination AS61075 (ROCKETNG) · min PMTU on path: 1500

4/4

Echo small (56B) 29.4ms

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	2a12:d8c0:109f:121::a1	0.4ms	0%*	AS204471	KARSOLINK - 2S Computers SRL, IT
3	2a12:d8c0:101f:103::1	8.4ms	80%	AS204471	KARSOLINK - 2S Computers SRL, IT
4	*	-	-	-
5	be47.core1.mil2.he.net 2001:470:e:69::2	12.4ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
6	be1.core1.zrh2.he.net 2001:470:e:dd::2	15.7ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
7	*	-	-	-
8	be1.core3.zrh3.he.net 2001:470:0:7e0::2	14.8ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
9	*	-	-	-
10	ip6-ae1-0-r28.esh.vie.nextlayer.net 2a01:190:1764:800f::1	19.8ms	0%	AS1764	NEXTLAYER-AS - Next Layer Telekommunikationsdienstleistungs- und Beratungs GmbH, AT
11	2a01:190:15ff:5c::2	21.7ms	0%	AS1764	NEXTLAYER-AS - Next Layer Telekommunikationsdienstleistungs- und Beratungs GmbH, AT
12	2a0c:b5c0::4	36.7ms	0%	AS61075	ROCKETNG - Rocket NG GmbH, AT
13	*	-	0%	-
14	*	-	-	-
15	*	-	-	-
16	*	-	-	-
17	*	-	-	-
18	*	-	-	-

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

tracepath -6

 1?: [LOCALHOST]                        0.011ms pmtu 1500
 1:  karsolink-01.net.karsolink.com                        0.683ms 
 2:  2a12:d8c0:109f:121::a1                                1.017ms 
 3:  2a12:d8c0:101f:6::1                                  10.293ms 
 4:  no reply
 5:  be47.core1.mil2.he.net                               12.486ms 
 6:  be1.core1.zrh2.he.net                                15.825ms 
 7:  no reply
 8:  be1.core3.zrh3.he.net                                14.843ms 
 9:  no reply
10:  ip6-ae1-0-r28.esh.vie.nextlayer.net                  21.002ms 
11:  2a01:190:15ff:5c::2                                  22.143ms 
12:  2a0c:b5c0::4                                         31.272ms asymm 11 
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500

From SLO host (6connect) openRFC 4890 ✗

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

4/4

Echo small (56B) 15.7ms

4/4

Echo 1500B (DF) 16.0ms

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	*	-	-	-
3	*	-	-	-
4	2a00:ee0:1:10::2	1.6ms	0%	AS5603	SIOL-NET - Telekom Slovenije, d.d., SI
5	ae3-1.fra20.core-backbone.com 2001:7f8::8463:0:1	14.1ms	0%	-	NA
6	ae6-2003.nbg20.core-backbone.com 2a01:4a0:0:2003::2	16.5ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
7	ae2-2032.muc20.core-backbone.com 2a01:4a0:0:2032::7	14.0ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
8	ae1-2028.vie10.core-backbone.com 2a01:4a0:0:2028::10	14.1ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
9	2a01:4a0:1338:22::2	29.0ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
10	*	-	0%	-
11	*	-	-	-
12	*	-	-	-
13	*	-	-	-
14	*	-	-	-
15	*	-	-	-
16	*	-	-	-
17	*	-	-	-
18	*	-	-	-

tracepath -6

 1?: [LOCALHOST]                        0.025ms pmtu 9000
 1:  fw1-lju.6connect.com                                  0.668ms 
 1:  fw1-lju.6connect.com                                  0.611ms 
 2:  no reply
 3:  2a00:ee1:800:9::1                                     2.329ms 
 4:  2a00:ee0:1:15::2                                      1.355ms asymm  3 
 5:  2a00:ee0:1:15::2                                     18.289ms pmtu 1500
 5:  ae3-1.fra20.core-backbone.com                        14.239ms asymm  9 
 6:  ae6-2003.nbg20.core-backbone.com                     16.831ms asymm 10 
 7:  ae2-2032.muc20.core-backbone.com                     14.268ms asymm  8 
 8:  ae1-2028.vie10.core-backbone.com                     14.277ms asymm  7 
 9:  2a01:4a0:1338:22::2                                  21.077ms asymm 11 
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
     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) 26.6ms

4/4

Echo 1500B (DF) 26.9ms

Type 1 dest-unreach

443,80

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	2a01:261:313:b814::1	0.4ms	0%*	AS34779	T-2-AS - T-2, d.o.o., SI
2	2a01:260:1::225	2.8ms	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	2.4ms	0%*	AS34779	T-2-AS - T-2, d.o.o., SI
4	2a01-260-1-1--39.core6.t-2.net 2a01:260:1:1::39	2.4ms	-	AS34779	T-2-AS - T-2, d.o.o., SI
5	ae16-2074.fra10.core-backbone.com 2a01:4a0:0:2074::3	27.1ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
6	ae2-2021.fra20.core-backbone.com 2a01:4a0:0:2021::4	31.9ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
7	ae6-2003.nbg20.core-backbone.com 2a01:4a0:0:2003::2	27.3ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
8	ae2-2032.muc20.core-backbone.com 2a01:4a0:0:2032::7	33.5ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
9	ae1-2028.vie10.core-backbone.com 2a01:4a0:0:2028::10	27.3ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
10	ae1-2028.vie10.core-backbone.com 2a01:4a0:0:2028::10	31.4ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
11	2a01:4a0:1338:22::2	33.2ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
12	*	-	-	-
13	*	-	-	-
14	*	-	-	-
15	*	-	-	-
16	*	-	-	-
17	*	-	-	-
18	*	-	-	-

tracepath -6

 1?: [LOCALHOST]                        0.028ms pmtu 1500
 1:  2a01:261:313:b814::1                                  0.972ms 
 1:  no reply
 2:  2a01:260:1::225                                       7.067ms 
 3:  2a01-260-1-1--9a.core6.t-2.net                        2.455ms 
 4:  2a01-260-1-1--39.core6.t-2.net                        3.793ms asymm  3 
 5:  ae16-2074.fra10.core-backbone.com                    32.232ms asymm  9 
 6:  ae16-2074.fra10.core-backbone.com                    32.547ms asymm  9 
 7:  ae2-2021.fra20.core-backbone.com                     26.605ms asymm  8 
 8:  ae2-2032.muc20.core-backbone.com                     31.999ms asymm  6 
 9:  ae1-2028.vie10.core-backbone.com                     31.315ms asymm  5 
10:  2a01:4a0:1338:22::2                                  55.032ms asymm  6 
11:  2a01:4a0:1338:22::2                                  34.724ms asymm  6 
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500