AS9119 - SoftnetRFC 4890 ✓RPKI ✓ 9/9ASPA -

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AS overview

Test target: 2a02:800:73:2::58 · trixie.softnet.si · address space: unknown · prefixes announced: 9

prefix(es): 2a0f:a6c0::/36, 2a0e:1e80::/29, 2a0b:c306::/32, 2a02:801::/32, 2a0b:c307::/32, 2a0e:2e00::/29, 2a0f:2180::/29, 2a09:e140::/29 (+1 more)

Targets & per-vantage-point probe results (10 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 / hostnameSourceSRB host (SOX, Belgrade)DE host (Berlin)DE host (Düsseldorf)NL host (go6lab)ITA host (Karsolink)SLO host (6connect)SLO host (T-2)
ping1500B:80:443reachedping1500B:80:443reachedping1500B:80:443reachedping1500B:80:443reachedping1500B:80:443reachedping1500B:80:443reachedping1500B:80:443reached
2a02:800:0:3::1hit✓✓refusedrefused-✓✓refusedrefused-✓✓refusedrefused-✓✓??-✓✓refusedrefused-✓✓refusedrefused-✓✓refusedrefused-
2a02:800:0:3::69hit✓✓openopen✓✓✓openopen✓✓✓openopen✓✓✓openopen✓✓✓openopen✓✓✓openopen✓✓✓openopen✓
2a02:800:0:3::73hit✓✓??✓✓✓??✓✓✓??✓✓✓??✓✓✓??✓✓✓??✓✓✓??✓
2a02:800:0:3::80hit✓✓openopen✓✓✓openopen✓✓✓openopen✓✓✓openopen✓✓✓openopen✓✓✓openopen✓✓✓openopen✓
2a02:800:0:3::81
mx1.softnet.eu		MX✓✓??✓✓✓??✓✓✓??✓✓✓??✓✓✓??✓✓✓??✓✓✓??✓
2a02:800:0:3::84hit✓✓openopen✓✓✓openopen✓✓✓openopen✓✓✓openopen✓✓✓openopen✓✓✓openopen✓✓✓openopen✓
2a02:800:73:2::55
mx.softnet.eu		drv✓✓??✓✓✓??✓✓✓??✓✓✓??✓✓✓??✓✓✓??✓✓✓??✓
2a02:800:73:2::56
support.softnet.si		drv✓✓openopen✓✓✓openopen✓✓✓openopen✓✓✓openopen✓✓✓openopen✓✓✓openopen✓✓✓openopen✓
2a02:800:73:2::58
trixie.softnet.si		NS✓✓??✓✓✓??✓✓✓??✓✓✓??✓✓✓??✓✓✓??✓✓✓??✓
2a02:800:73:2::60
mx2.softnet.eu		MX✓✓??✓✓✓??✓✓✓??✓✓✓??✓✓✓??✓✓✓??✓✓✓??✓

SIX peering

SIX member - open peering, peering member, since 1999-04-16. IPv6 LAN: 2001:7f8:46:0:1::9119. Locations: lj_tpl.

  • rs1-lan1-ipv6 → 2001:7f8:46:0:1::9119 Established (loc: lj_tpl, since 2026-08-05)
  • rs2-lan1-ipv6 → 2001:7f8:46:0:1::9119 Established (loc: lj_tpl, since 2026-08-24)

Announces via SIX route servers: 25 prefix(es) - 2001:3786:5011::/48, 2001:3786:9923::/48, 2001:678:1ec::/48, 2001:67c:1124::/48, 2001:67c:20b8::/47, 2001:67c:be0::/48, 2405:17c0::/32, 2a00:11c0:1::/48 (+17 more)

RPKI & ASPA

9 of 9 prefix(es) covered by a valid ROA.

PrefixRPKI stateReasonCovering VRP(s)
2a0e:2e00::/29✓ validmatched VRP (correct origin, length within maxLength)AS9119 /29 maxLen 29 (ripe)
2a02:800::/32✓ validmatched VRP (correct origin, length within maxLength)AS9119 /32 maxLen 32 (ripe)
2a0f:2180::/29✓ validmatched VRP (correct origin, length within maxLength)AS9119 /29 maxLen 29 (ripe)
2a0f:a6c0::/36✓ validmatched VRP (correct origin, length within maxLength)AS9119 /36 maxLen 36 (ripe)
2a0e:1e80::/29✓ validmatched VRP (correct origin, length within maxLength)AS9119 /29 maxLen 29 (ripe)
2a0b:c307::/32✓ validmatched VRP (correct origin, length within maxLength)AS9119 /32 maxLen 32 (ripe); AS9119 /29 maxLen 29 (ripe)
2a02:801::/32✓ validmatched VRP (correct origin, length within maxLength)AS9119 /32 maxLen 32 (ripe)
2a0b:c306::/32✓ validmatched VRP (correct origin, length within maxLength)AS9119 /32 maxLen 32 (ripe); AS9119 /29 maxLen 29 (ripe)
2a09:e140::/29✓ validmatched VRP (correct origin, length within maxLength)AS9119 /29 maxLen 29 (ripe)

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

At least one router inside AS9119's announced prefix replied during the random-target probe. Hop(s): 2a02:800:1:6403::2. These are candidate targets for direct testing.

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

Type 2 honored. Forged ICMPv6 PTB (MTU=1280) was accepted by the destination's stack: the next 1500-byte Echo Reply arrived split into 2 fragments via the IPv6 Fragment Header.
method: ICMPv6 Echo + forged PTB, tested 2026-09-23T10:35:06Z

tracepath6 per-hop PMTU drilldown

For each target where Type 2 verdicts disagreed across vantages, tracepath -6 ran from every vantage to capture per-hop PMTU evolution along that vantage's actual forward path. A pmtu change entry on a hop means that hop's router generated a PTB and we observed the shrink; absence of any change combined with a not_honored verdict suggests a router somewhere downstream is silently dropping >MTU packets (an RFC 4890 violation) rather than sending a PTB.

Target 2a02:800:0:3::69

amsterdam - verdict ?

(no hops captured)

belgrade - verdict honored

verdict = honored; final pmtu = 1500

#hop IPpmtu change
1<span class='muted'>no reply</span>
22001:7f8:1e:8::3a
32001:7f8:1e:8::3d
42a02:2d8:0:a00e:232a::
52001:7f8:30:0:2:1:0:9119
62a02:800:1:2001::4
72a02:800:1::11
82a02:800:0:3::69
berlin - verdict honored

verdict = honored; final pmtu = 1500

#hop IPpmtu change
1<span class='muted'>no reply</span>
22a06:d1c0::dead:beef:1c02
32a00:c380:b200:230::178
42a00:c380:b200:230::177
52001:7f8:30:0:2:1:0:9119
62a02:800:1:2001::4
7<span class='muted'>no reply</span>
82a02:800:0:3::69
duseldorf - verdict honored

verdict = honored; final pmtu = 1500

#hop IPpmtu change
1<span class='muted'>no reply</span>
22001:4ba0:92f4:3::1
3<span class='muted'>no reply</span>
42001:4ba0:ffe9:115::3
52001:4ba0:ffe9::1
62001:4ba0:ffe9:10::2
72001:7f8:1::a500:9119:1
82a02:800:e:200d::1
9<span class='muted'>no reply</span>
102a02:800:0:3::69
go6lab - verdict not_honored

verdict = not_honored; final pmtu = 1500

#hop IPpmtu change
1<span class='muted'>no reply</span>
22a00:8642:1000:f000::1
32a00:8642:dc1:2::b
42001:7f8:1::a500:9119:1
52a02:800:e:200d::1
62a02:800:1::11
72a02:800:0:3::69
karsolink - verdict honored

verdict = honored; final pmtu = 1500

#hop IPpmtu change
1<span class='muted'>no reply</span>
22a12:d8c0:109f:121::a1
32a12:d8c0:101f:6::1
4<span class='muted'>no reply</span>
52001:470:e:69::2
62001:470:e:dd::2
72001:470:e:153::1
8<span class='muted'>no reply</span>
92001:7f8::239f:0:1
102a02:800:e:200d::1
11<span class='muted'>no reply</span>
122a02:800:0:3::69
odin - verdict honored

verdict = honored; final pmtu = 1500

#hop IPpmtu change
1<span class='muted'>no reply</span>
22607:fae0:a000:2::2
32a03:a100:0:201:1::1
42a03:a100:0:201:1::1
52a02:800:1::11
62a02:800:0:3::69
t2 - verdict honored

verdict = honored; final pmtu = 1500

#hop IPpmtu change
1<span class='muted'>no reply</span>
22a01:260:1::225
32a01:260:1:1::9a
42001:7f8:46:0:1::9119
52a02:800:1::11
62a02:800:0:3::69

Target 2a02:800:0:3::84

amsterdam - verdict ?

(no hops captured)

belgrade - verdict honored

verdict = honored; final pmtu = 1500

#hop IPpmtu change
1<span class='muted'>no reply</span>
22001:7f8:1e:8::3a
32001:7f8:1e:8::3d
42a02:2d8:0:a00e:232a::
52001:7f8:30:0:2:1:0:9119
62a02:800:1:2001::4
7<span class='muted'>no reply</span>
82a02:800:0:3::84
berlin - verdict honored

verdict = honored; final pmtu = 1500

#hop IPpmtu change
1<span class='muted'>no reply</span>
22a06:d1c0::dead:beef:1c02
32a00:c380:b200:230::178
42a00:c380:b200:230::177
52001:7f8:30:0:2:1:0:9119
62a02:800:1:2001::4
7<span class='muted'>no reply</span>
82a02:800:0:3::84
duseldorf - verdict honored

verdict = honored; final pmtu = 1500

#hop IPpmtu change
1<span class='muted'>no reply</span>
22001:4ba0:92f4:3::1
3<span class='muted'>no reply</span>
42001:4ba0:ffe9:109::2
52001:4ba0:ffe9::1
62001:4ba0:ffe9:10::2
72001:7f8:1::a500:9119:1
82a02:800:e:200d::1
92a02:800:1::11
102a02:800:0:3::84
go6lab - verdict not_honored

verdict = not_honored; final pmtu = 1500

#hop IPpmtu change
1<span class='muted'>no reply</span>
22a00:8642:1000:f000::1
32a00:8642:dc1:2::b
42001:7f8:1::a500:9119:1
52a02:800:e:200d::1
62a02:800:1::11
72a02:800:0:3::84
karsolink - verdict honored

verdict = honored; final pmtu = 1500

#hop IPpmtu change
1<span class='muted'>no reply</span>
22a12:d8c0:109f:121::a1
32a12:d8c0:101f:103::1
4<span class='muted'>no reply</span>
52001:470:e:69::2
62001:470:e:dd::2
72001:470:e:153::1
8<span class='muted'>no reply</span>
92001:7f8::239f:0:1
102a02:800:e:200d::1
112a02:800:1::11
122a02:800:0:3::84
odin - verdict honored

verdict = honored; final pmtu = 1500

#hop IPpmtu change
1<span class='muted'>no reply</span>
22607:fae0:a000:2::2
32a03:a100:0:201:1::1
42a03:a100:0:201:1::1
52a02:800:1::11
62a02:800:0:3::84
t2 - verdict honored

verdict = honored; final pmtu = 1500

#hop IPpmtu change
1<span class='muted'>no reply</span>
22a01:260:1::225
32a01:260:1:1::9a
42001:7f8:46:0:1::9119
5<span class='muted'>no reply</span>
62a02:800:0:3::84

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 ↗

multi-vantage path diagram for AS9119

From SRB host (SOX, Belgrade)   openRFC 4890 ✓

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

4/4
Echo small (56B) 17.5ms
4/4
Echo 1500B (DF) 17.6ms
yes
Type 1 dest-unreach
-
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
12a09:ab81::10.2ms0%*AS60733PERKE-NET - ZORAN PEROVIC trading as Agencija Perke.NET, RS
2sox-pn.sox.rs
2001:7f8:1e:8::3a		0.2ms0%AS13004SOX - Serbian Open Exchange DOO, RS
32001:7f8:1e:8::3d0.4ms0%AS13004SOX - Serbian Open Exchange DOO, RS
42a02:2d8:0:a00e:232a12.6ms10%-
52001:7f8:30:0:2:1:0:911914.6ms0%-NA
62a02:800:1:2001::416.8ms0%AS9119SOFTNET-AS - SOFTNET d.o.o., SI
72a02:800:1:3021::19418.2ms0%AS9119SOFTNET-AS - SOFTNET d.o.o., SI
8trixie.softnet.si
2a02:800:73:2::58		17.5ms0%AS9119SOFTNET-AS - SOFTNET d.o.o., SI

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

tracepath -6

 1?: [LOCALHOST]                        0.011ms pmtu 1500
 1:  _gateway                                              1.470ms 
 1:  _gateway                                              0.815ms 
 2:  sox-pn.sox.rs                                         0.845ms 
 3:  2001:7f8:1e:8::3d                                     0.575ms asymm  2 
 4:  ae8-930.RT.IRX.VIE.AT.retn.net                       12.980ms asymm  3 
 5:  2001:7f8:30:0:2:1:0:9119                             13.696ms asymm  3 
 6:  no reply
 7:  2a02:800:1:3021::194                                 18.518ms asymm  8 
 8:  trixie.softnet.eu                                    17.760ms !A
     Resume: pmtu 1500

From DE host (Berlin)   openRFC 4890 ✓

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

4/4
Echo small (56B) 27.3ms
4/4
Echo 1500B (DF) 27.3ms
yes
Type 1 dest-unreach
-
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
1xe-0-0-13-178.gw01.ber01.as59645.net
2a06:d1c1:100:b::1		0.2ms0%*AS59645WYBT-NET - Tobias Fiebig, DE
2ae0-2453.cr10.ber01.lwlcom.net
2a06:d1c0::dead:beef:1c02		0.6ms0%*AS59645WYBT-NET - Tobias Fiebig, DE
3ae0-40.cr10.muc02.lwlcom.net
2a00:c380:b200:230::178		11.4ms0%AS50629LWLCOM - LWLcom GmbH, DE
4ae0-10.cr10.muc01.lwlcom.net
2a00:c380:b200:230::177		11.4ms0%AS50629LWLCOM - LWLcom GmbH, DE
5*-40%-
6*-30%-
72a02:800:1:3021::19427.9ms0%AS9119SOFTNET-AS - SOFTNET d.o.o., SI
8trixie.softnet.si
2a02:800:73:2::58		27.2ms0%AS9119SOFTNET-AS - SOFTNET d.o.o., SI

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

tracepath -6

 1?: [LOCALHOST]                        0.020ms pmtu 1500
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.571ms 
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.711ms 
 2:  ae0-2453.cr10.ber01.lwlcom.net                        1.137ms 
 3:  ae0-40.cr10.muc02.lwlcom.net                         22.035ms 
 4:  ae0-10.cr10.muc01.lwlcom.net                         11.817ms 
 5:  2001:7f8:30:0:2:1:0:9119                             18.371ms 
 6:  2a02:800:1:2001::4                                   26.547ms asymm  7 
 7:  2a02:800:1:3021::194                                 28.137ms asymm  8 
 8:  trixie.softnet.eu                                    27.488ms !A
     Resume: pmtu 1500

From DE host (Düsseldorf)   openRFC 4890 ✓

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

4/4
Echo small (56B) 21.7ms
4/4
Echo 1500B (DF) 21.8ms
yes
Type 1 dest-unreach
-
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
1xe-0-0-12-142.gw01.dus01.as59645.net
2a06:d1c1:100:d::1		0.2ms0%*AS59645WYBT-NET - Tobias Fiebig, DE
2eth1-0-12-h5594.edge5-dus1.bb.wiit.network
2001:4ba0:92f4:3::1		1.1ms0%AS24961MYLOC-AS - WIIT AG, DE
3lag13.agr3-dus3.bb.wiit.network
2001:4ba0:ffe9:7d::1		2.0ms0%AS24961MYLOC-AS - WIIT AG, DE
4lag11.core3-dus1.bb.wiit.network
2001:4ba0:ffe9:115::3		0.2ms0%AS24961MYLOC-AS - WIIT AG, DE
5lag2.core2-dus3.bb.wiit.network
2001:4ba0:ffe9::1		0.2ms0%AS24961MYLOC-AS - WIIT AG, DE
6lag0-vl1002.core1-ams-eq3.bb.wiit.network
2001:4ba0:ffe9:10::2		3.2ms0%AS24961MYLOC-AS - WIIT AG, DE
72001:7f8:1::a500:9119:115.0ms--NA
8*---
92a02:800:1:3021::19422.3ms0%AS9119SOFTNET-AS - SOFTNET d.o.o., SI
10trixie.softnet.si
2a02:800:73:2::58		21.7ms0%AS9119SOFTNET-AS - SOFTNET d.o.o., SI

tracepath -6

 1?: [LOCALHOST]                        0.020ms pmtu 1500
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.503ms 
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.365ms 
 2:  eth1-0-12-h5594.edge5-dus1.bb.wiit.network            2.719ms 
 3:  no reply
 4:  lag30.core3-dus1.bb.wiit.network                      0.582ms 
 5:  lag2.core2-dus3.bb.wiit.network                       0.274ms asymm  4 
 6:  lag0-vl1002.core1-ams-eq3.bb.wiit.network             3.386ms asymm  5 
 7:  2001:7f8:1::a500:9119:1                              14.899ms asymm  3 
 8:  no reply
 9:  2a02:800:1:3021::194                                 22.678ms asymm  7 
10:  trixie.softnet.si                                    22.269ms !A
     Resume: pmtu 1500

From NL host (go6lab)   openRFC 4890 ✓

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

4/4
Echo small (56B) 152.6ms
4/4
Echo 1500B (DF) 25.5ms
yes
Type 1 dest-unreach
-
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
12a00:8642:42::20.8ms0%AS203993GNA-DC1-AS - S.J.M. Steffann, NL
2*-0%*-
3ccr2-ccr1.dc1.nogalliance.org
2a00:8642:dc1:2::b		4.4ms0%AS203993GNA-DC1-AS - S.J.M. Steffann, NL
42001:7f8:1::a500:9119:110.6ms30%-NA
5*---
62a02:800:1:3021::19425.5ms0%AS9119SOFTNET-AS - SOFTNET d.o.o., SI
7trixie.softnet.si
2a02:800:73:2::58		27.1ms0%AS9119SOFTNET-AS - SOFTNET d.o.o., SI

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

tracepath -6

 1?: [LOCALHOST]                        0.031ms pmtu 1500
 1:  ???                                                   2.195ms 
 1:  ???                                                   1.786ms 
 2:  no reply
 3:  ccr2-ccr1.dc1.nogalliance.org                         2.353ms asymm  2 
 4:  2001:7f8:1::a500:9119:1                              11.316ms asymm  6 
 5:  2a02:800:e:200d::1                                   25.900ms asymm  8 
 6:  2a02:800:1:3021::194                                 28.099ms asymm  9 
 7:  trixie.softnet.eu                                    26.330ms !A
     Resume: pmtu 1500

From ITA host (Karsolink)   openRFC 4890 ✓

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

4/4
Echo small (56B) 25.9ms
4/4
Echo 1500B (DF) 25.9ms
yes
Type 1 dest-unreach
-
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
1*-0%*-
2*---
32a12:d8c0:101f:6::19.7ms90%AS204471KARSOLINK - 2S Computers SRL, IT
4*---
5be47.core1.mil2.he.net
2001:470:e:69::2		11.2ms0%AS6939HURRICANE - Hurricane Electric LLC, US
6be1.core1.zrh2.he.net
2001:470:e:dd::2		12.7ms0%AS6939HURRICANE - Hurricane Electric LLC, US
7be10.core4.fra1.he.net
2001:470:e:153::1		20.2ms0%AS6939HURRICANE - Hurricane Electric LLC, US
8*---
9decix.softnet.si
2001:7f8::239f:0:1		17.3ms30%-NA
102a02:800:e:200d::126.1ms0%AS9119SOFTNET-AS - SOFTNET d.o.o., SI
112a02:800:1:3021::19427.3ms0%AS9119SOFTNET-AS - SOFTNET d.o.o., SI
12trixie.softnet.si
2a02:800:73:2::58		26.3ms0%AS9119SOFTNET-AS - SOFTNET d.o.o., SI

Rate-limited ICMPv6: hop 3, hop 9 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.042ms pmtu 1500
 1:  karsolink-01.net.karsolink.com                        1.345ms 
 1:  karsolink-01.net.karsolink.com                        0.857ms 
 2:  2a12:d8c0:109f:121::a1                                1.119ms 
 3:  2a12:d8c0:101f:103::1                                 9.165ms 
 4:  no reply
 5:  be47.core1.mil2.he.net                               13.347ms 
 6:  be1.core1.zrh2.he.net                                16.571ms 
 7:  be10.core4.fra1.he.net                               20.979ms 
 8:  no reply
 9:  decix.softnet.si                                     18.184ms asymm  6 
10:  2a02:800:e:200d::1                                   25.928ms asymm  8 
11:  2a02:800:1:3021::194                                 27.340ms asymm  9 
12:  trixie.softnet.eu                                    26.690ms !A
     Resume: pmtu 1500

From SLO host (6connect)   openRFC 4890 ✓

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

4/4
Echo small (56B) 2.4ms
4/4
Echo 1500B (DF) 2.4ms
yes
Type 1 dest-unreach
-
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
1fw1-lju.6connect.com
2607:fae0:a000::2		0.2ms0%*AS80386CONNECT - 6connect, Inc., US
2*---
32a03:a100:0:201:1::10.6ms0%AS56635XENYA - XENYA inzeniring, proizvodnja in trgovina, d.o.o. Ljubljana, SI
42001:7f8:46:0:1::9119 @SIX1.7ms-AS51988ARNES-SIX - ARNES, SI
52a02:800:1:3021::1943.2ms0%AS9119SOFTNET-AS - SOFTNET d.o.o., SI
6trixie.softnet.si
2a02:800:73:2::58		2.9ms0%AS9119SOFTNET-AS - SOFTNET d.o.o., SI

tracepath -6

 1?: [LOCALHOST]                        0.033ms pmtu 9000
 1:  fw1-lju.6connect.com                                  0.758ms 
 1:  fw1-lju.6connect.com                                  0.742ms 
 2:  no reply
 3:  2a03:a100:0:201:1::1                                  0.910ms 
 4:  2a03:a100:0:201:1::1                                  0.912ms pmtu 1500
 4:  2001:7f8:46:0:1::9119                                 1.983ms asymm  5 
 5:  2a02:800:1:3021::194                                  3.354ms asymm  6 
 6:  trixie.softnet.eu                                     2.789ms !A
     Resume: pmtu 1500

From SLO host (T-2)   openRFC 4890 ✓

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

4/4
Echo small (56B) 3.5ms
4/4
Echo 1500B (DF) 3.8ms
yes
Type 1 dest-unreach
-
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
1*---
22a01:260:1::2255.7ms0%*AS34779T-2-AS - T-2, d.o.o., SI
32a01-260-1-1--9c.core6.t-2.net
2a01:260:1:1::9c		3.8ms0%*AS34779T-2-AS - T-2, d.o.o., SI
42001:7f8:46:0:1::9119 @SIX4.2ms50%AS51988ARNES-SIX - ARNES, SI
52a02:800:1:3021::1946.0ms0%AS9119SOFTNET-AS - SOFTNET d.o.o., SI
6trixie.softnet.si
2a02:800:73:2::58		6.1ms0%AS9119SOFTNET-AS - SOFTNET d.o.o., SI

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

tracepath -6

 1?: [LOCALHOST]                        0.022ms pmtu 1500
 1:  no reply
 2:  2a01:260:1::225                                       6.444ms 
 3:  2a01-260-1-1--9c.core6.t-2.net                        2.598ms 
 4:  no reply
 5:  2a02:800:1:3021::194                                  6.423ms 
 6:  trixie.softnet.si                                     4.292ms !A
     Resume: pmtu 1500