AS59909 TELE-TEC-AS Tele-Tec GmbH

AS overview

Test target: 2a0e:1504:4:36f::244 · ns1.austrogate.net · address space: unknown · prefixes announced: 4

prefix(es): 2a0e:1500::/29, 2a0d:d100::/32, 2a05:e40::/29, 2a05:e40:2000::/38

Targets & per-vantage-point probe results (4 target(s) across 7 vantage point(s))

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

Target IP / hostname	Source	SRB host (SOX, Belgrade)					DE host (Berlin)					DE host (Düsseldorf)					NL host (go6lab)					ITA host (Karsolink)					SLO host (6connect)					SLO host (T-2)
Target IP / hostname	Source	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached
`2a0e:1504:4:36f::232` ns4.austrogate.net	NS	✓	✗	?	?	-	✓	✗	?	?	-	✓	✗	?	?	-	✓	✗	?	?	-	✓	✗	?	?	-	✓	✗	?	?	-	✓	✗	?	?	-
`2a0e:1504:4:36f::235` groebis.at	whois	✓	✗	open	open	-	✓	✗	open	open	-	✓	✗	open	open	-	✓	✗	open	open	-	✓	✗	open	open	-	✓	✗	open	open	-	✓	✗	open	open	-
`2a0e:1504:4:36f::243` austrogate.net	DMARC	✓	✗	open	open	-	✓	✗	open	open	-	✓	✗	open	open	-	✓	✗	open	open	-	✓	✗	open	open	-	✓	✗	open	open	-	✓	✗	open	open	-
`2a0e:1504:4:36f::244` ns1.austrogate.net	NS	✓	✗	?	?	-	✓	✗	?	?	-	✓	✗	?	?	-	✓	✗	?	?	-	✓	✗	?	?	-	✓	✗	?	?	-	✓	✗	?	?	-

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), SLO host (T-2) - reached via an VIX / AAIX / SAIX / TIROL-IX / ERA-IX-resident transit operator.

RPKI & ASPA

4 of 4 prefix(es) covered by a valid ROA.

Prefix	RPKI state	Reason	Covering VRP(s)
`2a0e:1500::/29`	✓ valid	matched VRP (correct origin, length within maxLength)	AS209036 /29 maxLen 29 (ripe); AS59909 /29 maxLen 38 (ripe)
`2a0d:d100::/32`	✓ valid	matched VRP (correct origin, length within maxLength)	AS59909 /32 maxLen 32 (ripe)
`2a05:e40::/29`	✓ valid	matched VRP (correct origin, length within maxLength)	AS59909 /29 maxLen 38 (ripe)
`2a05:e40:2000::/38`	✓ valid	matched VRP (correct origin, length within maxLength)	AS59909 /38 maxLen 38 (ripe); AS59909 /29 maxLen 38 (ripe)

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

At least one router inside AS59909's announced prefix replied during the random-target probe. Hop(s): 2a05:e40:fffe:2::1. These are candidate targets for direct testing.

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

Type 2 not honored. Forged ICMPv6 PTB (MTU=1280) had no effect: the next 1500-byte Echo Reply still arrived whole (1360 B, no Fragment Header). PMTUD does not work toward this address from us.
method: ICMPv6 Echo + forged PTB, tested 2026-09-22T13:57:25Z

Failure detail - what to grep in your logs

vantage	our source	your target	method	result	tested (UTC)
belgrade	`2a09:ab81::91`	`2a0e:1504:4:36f::244`	`icmp6-echo`	not_honored	2026-09-22T13:57:25Z
berlin	`2a06:d1c1:10b::cccc`	`2a0e:1504:4:36f::244`	`icmp6-echo`	not_honored	2026-09-22T13:57:22Z
duseldorf	`2a06:d1c1:10d::aaaa`	`2a0e:1504:4:36f::244`	`icmp6-echo`	not_honored	2026-09-22T13:57:26Z
go6lab	`2a00:8642:42::75`	`2a0e:1504:4:36f::244`	`icmp6-echo`	not_honored	2026-09-22T13:58:25Z
karsolink	`2a12:d8c0:105a:9001::a154`	`2a0e:1504:4:36f::244`	`icmp6-echo`	not_honored	2026-09-22T13:57:18Z
odin	`2607:fae0:a000::42`	`2a0e:1504:4:36f::244`	`icmp6-echo`	not_honored	2026-09-22T13:57:27Z
t2	`2a01:261:313:b814:2a0:98ff:fe5b:13e4`	`2a0e:1504:4:36f::244`	`icmp6-echo`	not_honored	2026-09-22T13:57:21Z

Attempt log (belgrade):

icmp6-echo → not_honored (reply shrank 1360→1360 B)
dns-tcp → inconclusive (reply 156 B before PTB): max DNS-over-TCP segment 156B; not big enough to test PMTU shrink
tls → no_tcp: TLS connect failed
http → no_tcp: tcp/80 not open

Attempt log (berlin):

icmp6-echo → not_honored (reply shrank 1360→1360 B)
dns-tcp → inconclusive (reply 156 B before PTB): max DNS-over-TCP segment 156B; not big enough to test PMTU shrink
tls → no_tcp: TLS connect failed
http → no_tcp: tcp/80 not open

Attempt log (duseldorf):

icmp6-echo → not_honored (reply shrank 1360→1360 B)
dns-tcp → inconclusive (reply 156 B before PTB): max DNS-over-TCP segment 156B; not big enough to test PMTU shrink
tls → no_tcp: TLS connect failed
http → no_tcp: tcp/80 not open

Attempt log (go6lab):

icmp6-echo → not_honored (reply shrank 1360→1360 B)
dns-tcp → inconclusive (reply 156 B before PTB): max DNS-over-TCP segment 156B; not big enough to test PMTU shrink
tls → no_tcp: TLS connect failed
http → no_tcp: tcp/80 not open

Attempt log (karsolink):

icmp6-echo → not_honored (reply shrank 1360→1360 B)
dns-tcp → inconclusive (reply 156 B before PTB): max DNS-over-TCP segment 156B; not big enough to test PMTU shrink
tls → no_tcp: TLS connect failed
http → no_tcp: tcp/80 not open

Attempt log (odin):

icmp6-echo → not_honored (reply shrank 1360→1360 B)
dns-tcp → inconclusive (reply 156 B before PTB): max DNS-over-TCP segment 156B; not big enough to test PMTU shrink
tls → no_tcp: TLS connect failed
http → no_tcp: tcp/80 not open

Attempt log (t2):

icmp6-echo → not_honored (reply shrank 1360→1360 B)
dns-tcp → inconclusive (reply 156 B before PTB): max DNS-over-TCP segment 156B; not big enough to test PMTU shrink
tls → no_tcp: TLS connect failed
http → no_tcp: tcp/80 not open

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 (2026-09-22T13:57:25Z) 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.

Multi-vantage path map

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

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

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

filter likely at: destination AS59909 (TELE-TEC-AS) · min PMTU on path: 1492

4/4

Echo small (56B) 31.2ms

0/4

Echo 1500B (DF) -

Type 1 dest-unreach

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	0.4ms	0%	AS13004	SOX - Serbian Open Exchange DOO, RS
4	2a02:2d8:0:a00e:232a	11.2ms	0%	-
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	12.9ms	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	15.2ms	0%	AS1764	NEXTLAYER-AS - Next Layer Telekommunikationsdienstleistungs- und Beratungs GmbH, AT
8	2a0c:b5c5:1::1	28.4ms	0%	AS61075	ROCKETNG - Rocket NG GmbH, AT
9	2a0e:1504:3:20f1:ffff:ffff:ffff:ffff	30.3ms	0%	AS59909	TELE-TEC-AS - Tele-Tec GmbH, AT
10	*	-	-	-
11	*	-	0%	-
12	*	-	-	-
13	*	-	-	-
14	*	-	-	-
15	*	-	-	-
16	*	-	-	-
17	*	-	-	-
18	*	-	-	-
19	*	-	-	-
20	*	-	-	-

tracepath -6

 1?: [LOCALHOST]                        0.016ms pmtu 1500
 1:  _gateway                                              0.528ms 
 1:  _gateway                                              0.467ms 
 2:  sox-pn.sox.rs                                         0.643ms 
 3:  2001:7f8:1e:8::3d                                     0.780ms asymm  2 
 4:  ae8-930.RT.IRX.VIE.AT.retn.net                       12.816ms asymm  3 
 5:  vix-ip6-et-0-1-2-0-r60.inx.vie.at.nextlayer.net      13.170ms asymm  3 
 6:  ip6-ae2-0-r28.esh.vie.nextlayer.net                  13.453ms 
 7:  2a01:190:15ff:5c::2                                  13.030ms 
 8:  2a0c:b5c5:1::1                                       30.516ms asymm 12 
 9:  2a0c:b5c5:1::1                                       27.382ms pmtu 1492
 9:  2a0e:1504:3:20f1:ffff:ffff:ffff:ffff                 31.916ms asymm 13 
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
     Too many hops: pmtu 1492

From DE host (Berlin) echo onlyRFC 4890 ✗

filter likely at: destination AS59909 (TELE-TEC-AS) · min PMTU on path: 1492

4/4

Echo small (56B) 26.7ms

0/4

Echo 1500B (DF) -

Type 1 dest-unreach

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	4.9ms	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	5.3ms	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	10.7ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
8	ae2-2021.fra20.core-backbone.com 2a01:4a0:0:2021::4	10.9ms	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	14.6ms	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	27.7ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
13	2a0c:b5c5:1::1	26.3ms	0%	AS61075	ROCKETNG - Rocket NG GmbH, AT
14	2a0e:1504:3:20f1:ffff:ffff:ffff:ffff	26.0ms	0%	AS59909	TELE-TEC-AS - Tele-Tec GmbH, AT
15	*	-	10%	-
16	*	-	0%	-
17	*	-	-	-
18	*	-	-	-
19	*	-	-	-
20	*	-	-	-

Rate-limited ICMPv6: hop 15 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.030ms pmtu 1500
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.543ms 
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.570ms 
 2:  ae0-2453.cr10.ber01.lwlcom.net                        1.159ms 
 3:  ae3-90.cr10.ham01.lwlcom.net                          5.582ms 
 4:  ae0-50.cr11.ham01.lwlcom.net                          5.947ms 
 5:  2a00:c380:f000::4b                                    5.668ms asymm  4 
 6:  ae4-2087.dus10.core-backbone.com                     11.662ms asymm  5 
 7:  ae21-2071.fra10.core-backbone.com                    11.055ms asymm  5 
 8:  ae2-2021.fra20.core-backbone.com                     10.951ms asymm  4 
 9:  ae6-2003.nbg20.core-backbone.com                     12.435ms asymm  6 
10:  ae2-2032.muc20.core-backbone.com                     14.905ms asymm  7 
11:  ae1-2028.vie10.core-backbone.com                     20.619ms asymm  8 
12:  2a01:4a0:1338:22::2                                  59.874ms asymm 14 
13:  2a0c:b5c5:1::1                                       34.165ms asymm 14 
14:  2a0c:b5c5:1::1                                       29.422ms pmtu 1492
14:  2a0e:1504:3:20f1:ffff:ffff:ffff:ffff                 26.186ms asymm 15 
15:  no reply
16:  no reply
17:  no reply
18:  no reply
19:  no reply
20:  no reply
     Too many hops: pmtu 1492

From DE host (Düsseldorf) echo onlyRFC 4890 ✗

filter likely at: destination AS59909 (TELE-TEC-AS) · min PMTU on path: 1492

4/4

Echo small (56B) 17.8ms

0/4

Echo 1500B (DF) -

Type 1 dest-unreach

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	1.2ms	0%	AS24961	MYLOC-AS - WIIT AG, DE
3	lag13.agr3-dus3.bb.wiit.network 2001:4ba0:ffe9:7d::1	4.7ms	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	lag8.core1-dus-ix.bb.wiit.network 2001:4ba0:ffe9:8::2	0.4ms	0%	AS24961	MYLOC-AS - WIIT AG, DE
6	core-backbone-dus-gw.bb.wiit.network 2001:4ba0:ffe9:44::2	10.2ms	0%	AS24961	MYLOC-AS - WIIT AG, DE
7	ae21-2071.fra10.core-backbone.com 2a01:4a0:0:2071::4	9.5ms	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	10.9ms	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	18.8ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
12	2a01:4a0:1338:22::2	15.4ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
13	2a0c:b5c5:1::1	15.4ms	0%	AS61075	ROCKETNG - Rocket NG GmbH, AT
14	2a0e:1504:3:20f1:ffff:ffff:ffff:ffff	17.6ms	0%	AS59909	TELE-TEC-AS - Tele-Tec GmbH, AT
15	*	-	10%	-
16	*	-	0%	-
17	*	-	-	-
18	*	-	-	-
19	*	-	-	-
20	*	-	-	-

Rate-limited ICMPv6: hop 15 (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                  0.312ms 
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.236ms 
 2:  eth1-0-12-h5594.edge5-dus1.bb.wiit.network            1.222ms 
 3:  no reply
 4:  lag11.core3-dus1.bb.wiit.network                      0.328ms 
 5:  lag2.core1-dus-ix.bb.wiit.network                     0.586ms 
 6:  core-backbone-dus-gw.bb.wiit.network                 10.421ms 
 7:  ae21-2071.fra10.core-backbone.com                     9.845ms asymm  6 
 8:  ae2-2021.fra20.core-backbone.com                      9.626ms asymm  5 
 9:  ae6-2003.nbg20.core-backbone.com                     11.044ms asymm  7 
10:  ae2-2032.muc20.core-backbone.com                     13.459ms asymm  8 
11:  ae1-2028.vie10.core-backbone.com                     19.077ms asymm  9 
12:  2a01:4a0:1338:22::2                                  15.754ms asymm 13 
13:  2a0c:b5c5:1::1                                       17.795ms 
14:  2a0c:b5c5:1::1                                       16.692ms pmtu 1492
14:  2a0e:1504:3:20f1:ffff:ffff:ffff:ffff                 17.938ms 
15:  no reply
16:  no reply
17:  no reply
18:  no reply
19:  no reply
20:  no reply
     Too many hops: pmtu 1492

From NL host (go6lab) echo onlyRFC 4890 ✗

filter likely at: destination AS59909 (TELE-TEC-AS) · min PMTU on path: 1492

4/4

Echo small (56B) 43.9ms

0/4

Echo 1500B (DF) -

Type 1 dest-unreach

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	2a00:8642:42::2	0.3ms	0%	AS203993	GNA-DC1-AS - S.J.M. Steffann, NL
2	gw.friends.steffann.nl 2a00:8642:1000:f000::1	2.1ms	0%*	AS203993	GNA-DC1-AS - S.J.M. Steffann, NL
3	2a00:1ca8:1::194	4.0ms	0%	AS50673	Serverius-as - Serverius Holding B.V., NL
4	2a03:3f40::10:41	4.9ms	0%	AS50673	Serverius-as - Serverius Holding B.V., NL
5	2001:b28:3ff::1b1b:0:1	29.5ms	0%	AS31500	GNM-AS - Global Network Management Inc, AG
6	be2.core1.cph1.he.net 2001:470:e:5f::1	28.3ms	60%	AS6939	HURRICANE - Hurricane Electric LLC, US
7	*	-	-	-
8	de-cix.r60.inx.fra.de.nextlayer.net 2001:7f8::6e4:0:1	38.8ms	0%	-	NA
9	ams-ix.r06.nikh.ams.nl.nextlayer.net 2001:7f8:1::a500:1764:1	50.8ms	0%	-	NA
10	2a01:190:15ff:5c::2	40.1ms	0%	AS1764	NEXTLAYER-AS - Next Layer Telekommunikationsdienstleistungs- und Beratungs GmbH, AT
11	2a01:190:15ff:5c::2	46.0ms	0%	AS1764	NEXTLAYER-AS - Next Layer Telekommunikationsdienstleistungs- und Beratungs GmbH, AT
12	2a0e:1504:3:20f1:ffff:ffff:ffff:ffff	43.0ms	0%	AS59909	TELE-TEC-AS - Tele-Tec GmbH, AT
13	2a0e:1504:3:20f1:ffff:ffff:ffff:ffff	47.3ms	-	AS59909	TELE-TEC-AS - Tele-Tec GmbH, AT
14	*	-	0%	-
15	*	-	-	-
16	*	-	-	-
17	*	-	-	-
18	*	-	-	-
19	*	-	-	-
20	*	-	-	-

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

tracepath -6

 1?: [LOCALHOST]                        0.291ms pmtu 1492
 1:  2a00:8642:42::2                                       1.965ms 
 1:  2a00:8642:42::2                                       2.741ms 
 2:  gw.friends.steffann.nl                                3.076ms 
 3:  2a00:1ca8:1::194                                      3.532ms 
 4:  2a03:3f40::10:41                                      5.133ms 
 5:  2001:b28:3ff::1b1b:0:1                               28.130ms 
 6:  be2.core1.cph1.he.net                                25.695ms asymm  4 
 7:  no reply
 8:  de-cix.r60.inx.fra.de.nextlayer.net                  44.629ms 
 9:  ams-ix.r06.nikh.ams.nl.nextlayer.net                 45.859ms asymm  8 
10:  2a01:190:15ff:5c::2                                  42.694ms asymm 11 
11:  2a0c:b5c5:1::1                                       56.567ms asymm 12 
12:  2a0c:b5c5:1::1                                       48.657ms 
13:  2a0e:1504:3:20f1:ffff:ffff:ffff:ffff                 44.405ms 
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
19:  no reply
20:  no reply
     Too many hops: pmtu 1492
     Resume: pmtu 1492

From ITA host (Karsolink) echo onlyRFC 4890 ✗

filter likely at: destination AS59909 (TELE-TEC-AS) · min PMTU on path: 1492

4/4

Echo small (56B) 35.7ms

0/4

Echo 1500B (DF) -

Type 1 dest-unreach

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	karsolink-01.net.karsolink.com 2a12:d8c0:105a:9001::1	0.3ms	-	AS204471	KARSOLINK - 2S Computers SRL, IT
2	2a12:d8c0:109f:121::a1	0.3ms	0%*	AS204471	KARSOLINK - 2S Computers SRL, IT
3	2a12:d8c0:101f:103::1	8.3ms	-	AS204471	KARSOLINK - 2S Computers SRL, IT
4	*	-	-	-
5	be47.core1.mil2.he.net 2001:470:e:69::2	13.6ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
6	be1.core1.zrh2.he.net 2001:470:e:dd::2	15.4ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
7	*	-	-	-
8	be1.core3.zrh3.he.net 2001:470:0:7e0::2	14.4ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
9	*	-	-	-
10	ip6-ae2-0-r28.esh.vie.nextlayer.net 2a01:190:1764:8010::1	18.5ms	0%	AS1764	NEXTLAYER-AS - Next Layer Telekommunikationsdienstleistungs- und Beratungs GmbH, AT
11	2a01:190:15ff:5c::2	19.8ms	0%	AS1764	NEXTLAYER-AS - Next Layer Telekommunikationsdienstleistungs- und Beratungs GmbH, AT
12	2a0c:b5c5:1::1	34.1ms	0%	AS61075	ROCKETNG - Rocket NG GmbH, AT
13	2a0e:1504:3:20f1:ffff:ffff:ffff:ffff	34.7ms	0%	AS59909	TELE-TEC-AS - Tele-Tec GmbH, AT
14	*	-	-	-
15	*	-	0%	-
16	*	-	-	-
17	*	-	-	-
18	*	-	-	-
19	*	-	-	-
20	*	-	-	-

tracepath -6

 1?: [LOCALHOST]                        0.054ms pmtu 1500
 1:  karsolink-01.net.karsolink.com                        0.911ms 
 1:  karsolink-01.net.karsolink.com                        1.013ms 
 2:  2a12:d8c0:109f:121::a1                                0.930ms 
 3:  2a12:d8c0:101f:6::1                                  10.344ms 
 4:  no reply
 5:  be47.core1.mil2.he.net                               13.162ms 
 6:  be1.core1.zrh2.he.net                                15.163ms 
 7:  no reply
 8:  be1.core3.zrh3.he.net                                13.378ms 
 9:  no reply
10:  ip6-ae2-0-r28.esh.vie.nextlayer.net                  18.292ms 
11:  2a01:190:15ff:5c::2                                  25.792ms 
12:  2a0c:b5c5:1::1                                       39.250ms asymm 11 
13:  2a0c:b5c5:1::1                                       50.083ms pmtu 1492
13:  2a0e:1504:3:20f1:ffff:ffff:ffff:ffff                 36.085ms asymm 12 
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
19:  no reply
20:  no reply
     Too many hops: pmtu 1492

From SLO host (6connect) echo onlyRFC 4890 ✗

filter likely at: destination AS59909 (TELE-TEC-AS) · min PMTU on path: 1492

4/4

Echo small (56B) 18.6ms

0/4

Echo 1500B (DF) -

Type 1 dest-unreach

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	*	-	-	-
3	2a00:ee1:800:9::1	1.9ms	50%	AS5603	SIOL-NET - Telekom Slovenije, d.d., SI
4	2a00:ee0:1:10::2	1.3ms	0%	AS5603	SIOL-NET - Telekom Slovenije, d.d., SI
5	ae3-1.fra20.core-backbone.com 2001:7f8::8463:0:1	14.2ms	0%	-	NA
6	ae6-2003.nbg20.core-backbone.com 2a01:4a0:0:2003::2	17.6ms	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	13.9ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
9	2a01:4a0:1338:22::2	16.4ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
10	2a0c:b5c5:1::1	16.2ms	0%	AS61075	ROCKETNG - Rocket NG GmbH, AT
11	2a0e:1504:3:20f1:ffff:ffff:ffff:ffff	17.7ms	0%	AS59909	TELE-TEC-AS - Tele-Tec GmbH, AT
12	*	-	-	-
13	*	-	0%	-
14	*	-	-	-
15	*	-	-	-
16	*	-	-	-
17	*	-	-	-
18	*	-	-	-
19	*	-	-	-
20	*	-	-	-

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

tracepath -6

 1?: [LOCALHOST]                        0.026ms pmtu 9000
 1:  fw1-lju.6connect.com                                  2.012ms 
 1:  fw1-lju.6connect.com                                  0.530ms 
 2:  no reply
 3:  no reply
 4:  2a00:ee0:1:15::2                                      1.493ms asymm  3 
 5:  2a00:ee0:1:10::2                                      1.616ms pmtu 1500
 5:  ae3-1.fra20.core-backbone.com                        14.301ms asymm  9 
 6:  ae6-2003.nbg20.core-backbone.com                     16.357ms asymm 10 
 7:  ae2-2032.muc20.core-backbone.com                     14.191ms asymm  8 
 8:  ae1-2028.vie10.core-backbone.com                     14.430ms asymm  7 
 9:  2a01:4a0:1338:22::2                                  27.248ms asymm 11 
10:  2a0c:b5c5:1::1                                       17.447ms 
11:  2a0c:b5c5:1::1                                       17.097ms pmtu 1492
11:  2a0e:1504:3:20f1:ffff:ffff:ffff:ffff                 17.589ms asymm 12 
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

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

filter likely at: destination AS59909 (TELE-TEC-AS) · min PMTU on path: 1492

4/4

Echo small (56B) 12.7ms

0/4

Echo 1500B (DF) -

Type 1 dest-unreach

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	2.3ms	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	2.4ms	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	1.8ms	0%*	AS34779	T-2-AS - T-2, d.o.o., SI
5	*	-	-	-
6	vix-ip6-et-0-1-2-0-r60.esh.vie.at.nextlayer.net @VIX / AAIX / SAIX / TIROL-IX / ERA-IX 2001:7f8:30:0:1:1:0:1764	9.3ms	10%	-	NA
7	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	25.2ms	0%	-	NA
8	ip6-ae2-0-r28.esh.vie.nextlayer.net 2a01:190:1764:8010::1	10.0ms	0%	AS1764	NEXTLAYER-AS - Next Layer Telekommunikationsdienstleistungs- und Beratungs GmbH, AT
9	2a01:190:15ff:5c::2	11.7ms	0%	AS1764	NEXTLAYER-AS - Next Layer Telekommunikationsdienstleistungs- und Beratungs GmbH, AT
10	2a0c:b5c5:1::1	17.7ms	0%	AS61075	ROCKETNG - Rocket NG GmbH, AT
11	2a0e:1504:3:20f1:ffff:ffff:ffff:ffff	10.7ms	0%	AS59909	TELE-TEC-AS - Tele-Tec GmbH, AT
12	*	-	-	-
13	*	-	0%	-
14	*	-	-	-
15	*	-	-	-
16	*	-	-	-
17	*	-	-	-
18	*	-	-	-
19	*	-	-	-
20	*	-	-	-

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

tracepath -6

 1?: [LOCALHOST]                        0.030ms pmtu 1500
 1:  2a01:261:313:b814::1                                  0.929ms 
 1:  2a01:261:313:b814::1                                  1.095ms 
 2:  2a01:260:1::225                                       3.399ms 
 3:  2a01-260-1-1--9c.core6.t-2.net                        5.043ms 
 4:  2a01-260-1-1--38.core6.t-2.net                        3.135ms asymm  3 
 5:  100ge0-0-0-31.core1.vie1.he.net                      11.860ms 
 6:  100ge0-0-0-31.core1.vie1.he.net                      11.544ms asymm  5 
 7:  ip6-ae1-0-r28.esh.vie.nextlayer.net                  10.427ms asymm  8 
 8:  2a01:190:15ff:5c::2                                  12.871ms asymm  9 
 9:  2a0c:b5c5:1::1                                       15.256ms asymm  7 
10:  2a0c:b5c5:1::1                                       10.410ms pmtu 1492
10:  2a0e:1504:3:20f1:ffff:ffff:ffff:ffff                 12.126ms asymm  8 
11:  2a0e:1504:3:20f1:ffff:ffff:ffff:ffff                 12.749ms asymm  8 
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
     Too many hops: pmtu 1492