AS49014 WKO-AS Wirtschaftskammer Oesterreich

AS overview

Test target: 2001:67c:2c0:d090::1211 · wko.at · address space: PI · prefixes announced: 1

prefix(es): 2001:67c:2c0::/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
`2001:67c:2c0:d090::1211` wko.at	drv	✓	✓	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 NL host (go6lab) - 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)
`2001:67c:2c0::/48`	✓ valid	matched VRP (correct origin, length within maxLength)	AS49014 /48 maxLen 48 (ripe)

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

We probed 35 arbitrary IPv6 address(es) inside AS49014's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2a02:4140:1:0:92:63:155:15 at hop 15 - that router does not answer ICMPv6 Echo. This is not in AS49014'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

Vantage points disagree about Type 2 acceptance - transit ASes on one path may be filtering Type 2 even though the destination's stack accepts it on another path:

SRB host (SOX, Belgrade): Type 2 NOT honored. Forged PTB had no effect (filtered en route or stack ignored it). (ICMPv6 Echo + forged PTB)
DE host (Berlin): Type 2 NOT honored. Forged PTB had no effect (filtered en route or stack ignored it). (ICMPv6 Echo + forged PTB)
DE host (Düsseldorf): inconclusive: no Echo Reply after PTB (probe 1500B). (ICMPv6 Echo + forged PTB)
NL host (go6lab): Type 2 NOT honored. Forged PTB had no effect (filtered en route or stack ignored it). (ICMPv6 Echo + forged PTB)
ITA host (Karsolink): Type 2 NOT honored. Forged PTB had no effect (filtered en route or stack ignored it). (ICMPv6 Echo + forged PTB)
SLO host (6connect): inconclusive: no Echo Reply to 1300-byte probe. (ICMPv6 Echo + forged PTB)
SLO host (T-2): inconclusive: no Echo Reply after PTB (probe 1500B). (ICMPv6 Echo + forged PTB)

Why they disagree - reachability mismatch: One vantage couldn't drive a flow at all to this destination (no Echo Reply or no responding TCP port), so the active test had no behavioural change to observe. The other vantage's verdict is the only meaningful one here.

Failure detail - what to grep in your logs

vantage	our source	your target	method	result	tested (UTC)
belgrade	`2a09:ab81::91`	`2001:67c:2c0:d090::1211`	`icmp6-echo`	not_honored	2026-09-22T13:50:31Z
berlin	`2a06:d1c1:10b::cccc`	`2001:67c:2c0:d090::1211`	`icmp6-echo`	not_honored	2026-09-22T13:50:30Z
duseldorf	`2a06:d1c1:10d::aaaa`	`2001:67c:2c0:d090::1211`	`icmp6-echo`	inconclusive	2026-09-22T13:50:27Z
go6lab	`2a00:8642:42::75`	`2001:67c:2c0:d090::1211`	`icmp6-echo`	not_honored	2026-09-22T13:50:49Z
karsolink	`2a12:d8c0:105a:9001::a154`	`2001:67c:2c0:d090::1211`	`icmp6-echo`	not_honored	2026-09-22T13:50:35Z
odin	`2607:fae0:a000::42`	`2001:67c:2c0:d090::1211`	`icmp6-echo`	no_echo	2026-09-22T13:50:28Z
t2	`2a01:261:313:b814:2a0:98ff:fe5b:13e4`	`2001:67c:2c0:d090::1211`	`icmp6-echo`	inconclusive	2026-09-22T13:50:27Z

Attempt log (belgrade):

icmp6-echo → not_honored (reply shrank 1360→1360 B)
dns-tcp → no_tcp: connect failed: timed out
tls → inconclusive (reply 7 B before PTB): largest TLS segment 7B too small to detect shrink
http → inconclusive (reply 188 B before PTB): natural max segment 188B already <= 1220B; nothing to shrink

Attempt log (berlin):

icmp6-echo → not_honored (reply shrank 1360→1360 B)
dns-tcp → no_tcp: connect failed: timed out
tls → inconclusive (reply 7 B before PTB): largest TLS segment 7B too small to detect shrink
http → inconclusive (reply 188 B before PTB): natural max segment 188B already <= 1220B; nothing to shrink

Attempt log (duseldorf):

icmp6-echo → inconclusive (reply 1460 B before PTB): no Echo Reply after PTB (probe 1500B)
dns-tcp → no_tcp: connect failed: timed out
tls → inconclusive (reply 7 B before PTB): largest TLS segment 7B too small to detect shrink
http → inconclusive (reply 188 B before PTB): natural max segment 188B 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 (reply 7 B before PTB): largest TLS segment 7B too small to detect shrink
http → inconclusive: no TCP data from dest in baseline

Attempt log (karsolink):

icmp6-echo → not_honored (reply shrank 1260→1260 B)
dns-tcp → no_tcp: connect failed: timed out
tls → inconclusive (reply 7 B before PTB): largest TLS segment 7B too small to detect shrink
http → inconclusive (reply 188 B before PTB): natural max segment 188B already <= 1220B; nothing to shrink

Attempt log (odin):

icmp6-echo → no_echo: no Echo Reply to 1300-byte probe
dns-tcp → no_tcp: connect failed: timed out
tls → inconclusive (reply 7 B before PTB): largest TLS segment 7B too small to detect shrink
http → inconclusive (reply 188 B before PTB): natural max segment 188B already <= 1220B; nothing to shrink

Attempt log (t2):

icmp6-echo → inconclusive (reply 1460 B before PTB): no Echo Reply after PTB (probe 1500B)
dns-tcp → no_tcp: connect failed: timed out
tls → inconclusive (reply 7 B before PTB): largest TLS segment 7B too small to detect shrink
http → inconclusive (reply 188 B before PTB): natural max segment 188B 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 (2026-09-22T13:50:31Z) 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 inconclusive
go6lab: probe icmp6-echo → verdict not_honored
karsolink: probe icmp6-echo → verdict not_honored
odin: probe icmp6-echo → verdict no_echo
t2: probe icmp6-echo → verdict inconclusive

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

vantage	icmp6-echo	dns-tcp	tls	http
belgrade	not_honored	no_tcp	inconclusive	inconclusive
berlin	not_honored	no_tcp	inconclusive	inconclusive
duseldorf	inconclusive	no_tcp	inconclusive	inconclusive
go6lab	not_honored	no_tcp	inconclusive	inconclusive
karsolink	not_honored	no_tcp	inconclusive	inconclusive
odin	no_echo	no_tcp	inconclusive	inconclusive
t2	inconclusive	no_tcp	inconclusive	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): AS49014, AS6939, AS201011.

From belgrade (open/Type-2=not_honored) the path enters an opaque hop at hop 15; from berlin (open/Type-2=not_honored) the same hop is in AS49014. Last common AS: AS49014. The disagreement is most likely rooted in one of those two transit ASes.
From belgrade (open/Type-2=not_honored) the path enters AS49014 at hop 5; from duseldorf (open/Type-2=inconclusive) the same hop is in AS6939. Last common AS: AS49014. 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 16; from go6lab (open/Type-2=not_honored) the same hop is in AS49014. Last common AS: AS49014. 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 9; from karsolink (open/Type-2=not_honored) the same hop is in AS49014. Last common AS: AS49014. The disagreement is most likely rooted in one of those two transit ASes.
From belgrade (open/Type-2=not_honored) the path enters AS49014 at hop 5; from odin (open/Type-2=no_echo) the same hop is in AS6939. Last common AS: AS49014. 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 9; from t2 (open/Type-2=inconclusive) the same hop is in AS49014. Last common AS: AS49014. 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 duseldorf (open/Type-2=inconclusive) the same hop is in AS43957. Last common AS: AS49014. 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 go6lab (open/Type-2=not_honored) the same hop is in AS47147. Last common AS: AS49014. 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 (open/Type-2=not_honored) the same hop is in AS43957. Last common AS: AS49014. 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 odin (open/Type-2=no_echo) the same hop is in AS43957. Last common AS: AS49014. 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 t2 (open/Type-2=inconclusive) the same hop is in AS43957. Last common AS: AS49014. The disagreement is most likely rooted in one of those two transit ASes.
From duseldorf (open/Type-2=inconclusive) the path enters AS6939 at hop 4; from go6lab (open/Type-2=not_honored) the same hop is in AS50673. Last common AS: AS49014. The disagreement is most likely rooted in one of those two transit ASes.
From go6lab (open/Type-2=not_honored) the path enters AS47147 at hop 6; from karsolink (open/Type-2=not_honored) the same hop is in AS6939. Last common AS: AS49014. 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 (open/Type-2=no_echo) the same hop is in AS56635. Last common AS: AS49014. The disagreement is most likely rooted in one of those two transit ASes.
From go6lab (open/Type-2=not_honored) the path enters AS47147 at hop 6; from t2 (open/Type-2=inconclusive) the same hop is in AS6939. Last common AS: AS49014. 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) 35.7ms

4/4

Echo 1500B (DF) 35.6ms

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	0.3ms	0%*	AS60733	PERKE-NET - ZORAN PEROVIC trading as Agencija Perke.NET, RS
2	sox-pn.sox.rs 2001:7f8:1e:8::3a	0.3ms	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	23.4ms	0%	-	NA
5	www.wko.at 2001:67c:2c0:d090::1211	37.2ms	0%	AS49014	WKO-AS - Wirtschaftskammer Oesterreich, AT

tracepath -6

 1?: [LOCALHOST]                        0.022ms pmtu 1500
 1:  _gateway                                              0.458ms 
 1:  _gateway                                              0.480ms 
 2:  sox-pn.sox.rs                                         0.721ms 
 3:  2001:7f8:1e:8::3d                                     0.726ms asymm  2 
 4:  2001:67c:128c::699                                   24.698ms asymm  5 
 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
23:  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) 24.3ms

3/4

Echo 1500B (DF) 24.7ms

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	14.5ms	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	4.8ms	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	11.5ms	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	ae2-2021.fra20.core-backbone.com 2a01:4a0:0:2021::4	10.7ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
9	ae6-2003.nbg20.core-backbone.com 2a01:4a0:0:2003::2	12.1ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
10	ae2-2032.muc20.core-backbone.com 2a01:4a0:0:2032::7	14.7ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
11	ae1-2028.vie10.core-backbone.com 2a01:4a0:0:2028::10	20.1ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
12	2a01:4a0:1338:25::2	20.7ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
13	2a02:4140:0:1::25	24.1ms	0%	AS43957	ASN-WNTNEWMEDIA - WNT Telecommunication GmbH, AT
14	2a02:4140:1:0:92:63:155:15	24.4ms	0%	AS43957	ASN-WNTNEWMEDIA - WNT Telecommunication GmbH, AT
15	2001:67c:2c0:fade::6	24.5ms	0%	AS49014	WKO-AS - Wirtschaftskammer Oesterreich, AT
16	www.wko.at 2001:67c:2c0:d090::1211	24.5ms	0%	AS49014	WKO-AS - Wirtschaftskammer Oesterreich, AT

tracepath -6

 1?: [LOCALHOST]                        0.030ms pmtu 1500
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.522ms 
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.472ms 
 2:  ae0-2453.cr10.ber01.lwlcom.net                        4.261ms 
 3:  ae3-90.cr10.ham01.lwlcom.net                          5.474ms 
 4:  ae0-50.cr11.ham01.lwlcom.net                          5.117ms 
 5:  2a00:c380:f000::4b                                    5.500ms asymm  4 
 6:  ae4-2087.dus10.core-backbone.com                     11.748ms asymm  5 
 7:  ae21-2071.fra10.core-backbone.com                    11.152ms asymm  5 
 8:  ae2-2021.fra20.core-backbone.com                     10.942ms asymm  4 
 9:  ae6-2003.nbg20.core-backbone.com                     12.528ms asymm  6 
10:  ae2-2032.muc20.core-backbone.com                     15.024ms asymm  7 
11:  ae1-2028.vie10.core-backbone.com                     20.539ms asymm  8 
12:  2a01:4a0:1338:25::2                                  21.774ms asymm  5 
13:  2a02:4140:0:1::25                                    24.664ms asymm  7 
14:  2a02:4140:1:0:92:63:155:15                           24.696ms asymm  8 
15:  2001:67c:2c0:fade::6                                 24.601ms asymm  9 
16:  no reply
17:  no reply
18:  no reply
19:  no reply
20:  no reply
21:  no reply
22:  no reply
23:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500

From DE host (Düsseldorf) open

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

4/4

Echo small (56B) 15.8ms

4/4

Echo 1500B (DF) 16.1ms

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	ipv6.decix-dusseldorf.core1.dus1.he.net 2001:7f8:9e::1b1b:0:1	5.6ms	0%	-	NA
3	100ge0-0-0-18.core4.fra1.he.net 2001:470:0:52e::1	6.7ms	80%	AS6939	HURRICANE - Hurricane Electric LLC, US
4	be8.core1.prg1.he.net 2001:470:e:1e::2	13.3ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
5	be3.core1.vie1.he.net 2001:470:e:a7::2	16.1ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
6	2001:470:34a::2	15.3ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
7	2a02:4140:0:1::25	15.3ms	0%	AS43957	ASN-WNTNEWMEDIA - WNT Telecommunication GmbH, AT
8	2a02:4140:1:0:92:63:155:15	15.6ms	0%	AS43957	ASN-WNTNEWMEDIA - WNT Telecommunication GmbH, AT
9	2001:67c:2c0:fade::6	15.7ms	0%	AS49014	WKO-AS - Wirtschaftskammer Oesterreich, AT
10	www.wko.at 2001:67c:2c0:d090::1211	15.7ms	0%	AS49014	WKO-AS - Wirtschaftskammer Oesterreich, AT

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

tracepath -6

 1?: [LOCALHOST]                        0.020ms pmtu 1500
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.325ms 
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.389ms 
 2:  ipv6.decix-dusseldorf.core1.dus1.he.net               5.841ms asymm  3 
 3:  100ge0-0-0-18.core4.fra1.he.net                       7.553ms asymm  4 
 4:  be8.core1.prg1.he.net                                12.287ms asymm  5 
 5:  be3.core1.vie1.he.net                                18.876ms asymm  4 
 6:  2001:470:34a::2                                      15.566ms asymm  5 
 7:  2a02:4140:0:1::25                                    15.602ms asymm  6 
 8:  2a02:4140:1:0:92:63:155:15                           15.988ms asymm  7 
 9:  2001:67c:2c0:fade::6                                 16.018ms asymm  8 
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
23:  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) 35.1ms

4/4

Echo 1500B (DF) 32.3ms

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	1.2ms	0%	AS203993	GNA-DC1-AS - S.J.M. Steffann, NL
2	*	-	0%*	-
3	2a00:1ca8:1::194	9.9ms	0%	AS50673	Serverius-as - Serverius Holding B.V., NL
4	2a03:3f40::10:33	7.5ms	0%	AS50673	Serverius-as - Serverius Holding B.V., NL
5	ae3-1337.bbr02.anx63.ams.nl.anexia-it.net 2001:7f8:1::a504:7147:1	9.2ms	0%	-	NA
6	2a00:11c0:47:1:47::156	8.8ms	0%	AS47147	AS-ANX - Anexia Cloud Solutions GmbH, AT
7	2a00:11c0:47:1:47::136	37.6ms	0%	AS47147	AS-ANX - Anexia Cloud Solutions GmbH, AT
8	2a00:11c0:47:1:47::145	13.9ms	0%	AS47147	AS-ANX - Anexia Cloud Solutions GmbH, AT
9	2a00:11c0:47:1:47::151	24.4ms	0%	AS47147	AS-ANX - Anexia Cloud Solutions GmbH, AT
10	fra1.mx240.ae3.anexia.as48314.net 2a00:11c0:47:3::8d	26.7ms	0%	AS47147	AS-ANX - Anexia Cloud Solutions GmbH, AT
11	2001:1618:0:b::1	25.2ms	0%	AS15702	ONSTAGENET - euNetworks GmbH, DE
12	2001:7f8:30:0:2:1:0:6939 @VIX / AAIX / SAIX / TIROL-IX / ERA-IX	26.8ms	0%	-	NA
13	2001:470:34a::2	29.1ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
14	2a02:4140:0:1::25	31.3ms	0%	AS43957	ASN-WNTNEWMEDIA - WNT Telecommunication GmbH, AT
15	2a02:4140:1:0:92:63:155:15	24.7ms	0%	AS43957	ASN-WNTNEWMEDIA - WNT Telecommunication GmbH, AT
16	2001:67c:2c0:fade::6	25.3ms	0%	AS49014	WKO-AS - Wirtschaftskammer Oesterreich, AT
17	www.wko.at 2001:67c:2c0:d090::1211	25.1ms	0%	AS49014	WKO-AS - Wirtschaftskammer Oesterreich, AT

tracepath -6

 1?: [LOCALHOST]                        0.043ms pmtu 1500
 1:  2a00:8642:42::2                                       2.632ms 
 1:  2a00:8642:42::2                                       3.874ms 
 2:  no reply
 3:  2a00:1ca8:1::194                                      5.174ms 
 4:  2a03:3f40::10:33                                      6.299ms 
 5:  ae3-1337.bbr02.anx63.ams.nl.anexia-it.net             7.117ms 
 6:  2a00:11c0:47:1:47::156                                9.142ms 
 7:  2a00:11c0:47:1:47::211                               15.323ms asymm 10 
 8:  2a00:11c0:47:1:47::145                               14.620ms asymm 11 
 9:  2a00:11c0:47:1:47::135                               33.553ms asymm  8 
10:  fra1.mx240.ae3.anexia.as48314.net                    27.008ms asymm  8 
11:  2001:1618:0:4::1                                     26.992ms asymm  7 
12:  2001:7f8:30:0:2:1:0:6939                             37.034ms asymm  6 
13:  2001:470:34a::2                                      25.425ms asymm  7 
14:  2a02:4140:0:1::25                                    40.544ms asymm  8 
15:  2a02:4140:1:0:92:63:155:15                           35.018ms asymm  9 
16:  2001:67c:2c0:fade::6                                 30.071ms asymm 10 
17:  no reply
18:  no reply
19:  no reply
20:  no reply
21:  no reply
22:  no reply
23:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500

From ITA host (Karsolink) openRFC 4890 ✗

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

4/4

Echo small (56B) 21.1ms

3/4

Echo 1500B (DF) 20.2ms

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	0.4ms	0%*	AS204471	KARSOLINK - 2S Computers SRL, IT
2	2a12:d8c0:109f:121::a1	0.4ms	0%*	AS204471	KARSOLINK - 2S Computers SRL, IT
3	2a12:d8c0:101f:103::1	8.2ms	60%	AS204471	KARSOLINK - 2S Computers SRL, IT
4	*	-	-	-
5	100ge0-0-0-20.core1.vie1.he.net 2001:470:0:414::1	21.4ms	20%	AS6939	HURRICANE - Hurricane Electric LLC, US
6	2001:470:34a::2	21.1ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
7	2a02:4140:0:1::25	20.4ms	0%	AS43957	ASN-WNTNEWMEDIA - WNT Telecommunication GmbH, AT
8	2a02:4140:1:0:92:63:155:15	19.9ms	0%	AS43957	ASN-WNTNEWMEDIA - WNT Telecommunication GmbH, AT
9	2001:67c:2c0:fade::6	20.6ms	0%	AS49014	WKO-AS - Wirtschaftskammer Oesterreich, AT
10	www.wko.at 2001:67c:2c0:d090::1211	19.9ms	0%	AS49014	WKO-AS - Wirtschaftskammer Oesterreich, AT

Rate-limited ICMPv6: hop 3, 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:  karsolink-01.net.karsolink.com                        0.936ms 
 1:  karsolink-01.net.karsolink.com                        0.677ms 
 2:  no reply
 3:  2a12:d8c0:101f:6::1                                  10.287ms 
 4:  no reply
 5:  100ge0-0-0-20.core1.vie1.he.net                      22.600ms 
 6:  2001:470:34a::2                                      20.722ms 
 7:  2a02:4140:0:1::25                                    22.534ms 
 8:  2a02:4140:1:0:92:63:155:15                           20.303ms 
 9:  2001:67c:2c0:fade::6                                 21.949ms 
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
23:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500

From SLO host (6connect) open

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

4/4

Echo small (56B) 6.5ms

4/4

Echo 1500B (DF) 6.6ms

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	0.4ms	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	e0-1.core1.lju1.he.net 2001:470:1:5be::1	2.4ms	30%	AS6939	HURRICANE - Hurricane Electric LLC, US
5	100ge0-0-0-5.core1.vie1.he.net 2001:470:0:578::1	8.5ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
6	2001:470:34a::2	59.2ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
7	2a02:4140:0:1::25	7.2ms	0%	AS43957	ASN-WNTNEWMEDIA - WNT Telecommunication GmbH, AT
8	2a02:4140:1:0:92:63:155:15	6.6ms	0%	AS43957	ASN-WNTNEWMEDIA - WNT Telecommunication GmbH, AT
9	2001:67c:2c0:fade::6	6.9ms	0%	AS49014	WKO-AS - Wirtschaftskammer Oesterreich, AT
10	www.wko.at 2001:67c:2c0:d090::1211	6.6ms	0%	AS49014	WKO-AS - Wirtschaftskammer Oesterreich, AT

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

tracepath -6

 1?: [LOCALHOST]                        0.025ms pmtu 9000
 1:  fw1-lju.6connect.com                                  0.665ms 
 1:  fw1-lju.6connect.com                                  0.565ms 
 2:  ccr-to-fw-ccr1-gw-lju.6connect.com                    0.808ms 
 3:  2a03:a100:0:201:1::1                                  1.279ms 
 4:  2a03:a100:0:201:1::1                                  1.636ms pmtu 1500
 4:  e0-1.core1.lju1.he.net                                2.119ms 
 5:  100ge0-0-0-5.core1.vie1.he.net                        9.321ms 
 6:  2001:470:34a::2                                       6.174ms 
 7:  2a02:4140:0:1::25                                     6.864ms 
 8:  2a02:4140:1:0:92:63:155:15                            6.575ms 
 9:  2001:67c:2c0:fade::6                                  7.153ms 
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
23:  no reply
     Too many hops: pmtu 1500

From SLO host (T-2) open

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

4/4

Echo small (56B) 10.0ms

4/4

Echo 1500B (DF) 10.2ms

yes

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	6.1ms	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	1.8ms	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	1.6ms	0%*	AS34779	T-2-AS - T-2, d.o.o., SI
5	100ge0-0-0-31.core1.vie1.he.net 2001:470:0:4a8::1	11.8ms	-	AS6939	HURRICANE - Hurricane Electric LLC, US
6	2001:470:34a::2	9.6ms	60%	AS6939	HURRICANE - Hurricane Electric LLC, US
7	2a02:4140:0:1::25	9.6ms	0%	AS43957	ASN-WNTNEWMEDIA - WNT Telecommunication GmbH, AT
8	2a02:4140:0:1::25	9.9ms	0%	AS43957	ASN-WNTNEWMEDIA - WNT Telecommunication GmbH, AT
9	2001:67c:2c0:fade::6	9.3ms	0%	AS49014	WKO-AS - Wirtschaftskammer Oesterreich, AT
10	www.wko.at 2001:67c:2c0:d090::1211	9.8ms	0%	AS49014	WKO-AS - Wirtschaftskammer Oesterreich, AT

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

tracepath -6

 1?: [LOCALHOST]                        0.090ms pmtu 1500
 1:  no reply
 2:  2a01:260:1::225                                      10.668ms 
 3:  2a01-260-1-1--9c.core6.t-2.net                        2.396ms 
 4:  2a01-260-1-1--38.core6.t-2.net                        2.807ms asymm  3 
 5:  100ge0-0-0-31.core1.vie1.he.net                      12.166ms 
 6:  2001:470:34a::2                                       9.775ms asymm  7 
 7:  2001:470:34a::2                                      10.248ms 
 8:  2a02:4140:1:0:92:63:155:15                           11.075ms asymm  9 
 9:  2a02:4140:1:0:92:63:155:15                           10.722ms 
10:  2001:67c:2c0:fade::6                                  9.826ms 
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
23:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500