AS overview
Test target: 2a02:23d0:0:1:0:1:1:1 · via IPv6 Hitlist (responsive) · address space: mixed · prefixes announced: 1
prefix(es): 2a02:23d0::/32
Targets & per-vantage-point probe results (3 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) | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | ||
2a02:23d0:0:1:0:1:1:1 | hit | ✓ | ✓ | refused | refused | - | ✓ | ✓ | refused | refused | - | ✓ | ✓ | refused | refused | - | ✓ | ✓ | ? | ? | - | ✓ | ✓ | refused | refused | - | ✓ | ✓ | refused | refused | - | ✓ | ✓ | refused | refused | - |
2a02:23d0:0:1:0:1:2:1 | hit | ✓ | ✓ | refused | refused | - | ✓ | ✓ | refused | refused | - | ✓ | ✓ | refused | refused | - | ✓ | ✓ | ? | ? | - | ✓ | ✓ | refused | refused | - | ✓ | ✓ | refused | refused | - | ✓ | ✓ | refused | refused | - |
2a02:23d0:0:1::77 | hit | ✓ | ✓ | refused | refused | - | ✓ | ✓ | refused | refused | - | ✓ | ✓ | refused | refused | - | ✓ | ✓ | ? | ? | - | ✓ | ✓ | refused | refused | - | ✓ | ✓ | refused | refused | - | ✓ | ✓ | refused | refused | - |
SIX peering
SIX member - open peering, peering member, since 2012-02-01. IPv6 LAN: 2001:7f8:46:0:1::5435. Locations: lj_tpl.
- rs1-lan1-ipv6 →
2001:7f8:46:0:1::5435Established (loc: lj_tpl, since 2026-08-05) - rs2-lan1-ipv6 →
2001:7f8:46:0:1::5435Established (loc: lj_tpl, since 2026-08-24)
RPKI & ASPA
1 of 1 prefix(es) covered by a valid ROA.
| Prefix | RPKI state | Reason | Covering VRP(s) |
|---|---|---|---|
2a02:23d0::/32 | ✓ valid | matched VRP (correct origin, length within maxLength) | AS5435 /32 maxLen 32 (ripe) |
Random-IP probe (yarrp) into the AS' prefixes
We probed 35 arbitrary IPv6 address(es) inside AS5435's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2a02:d68:c:1002::2 at hop 16 - that router answers ICMPv6 Echo. This is not in AS5435's announced prefix; operationally it's the AS-edge / peering interface (often on a SIX 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): inconclusive: no Echo Reply after PTB (probe 1500B). (ICMPv6 Echo + forged PTB)
- DE host (Berlin): Type 2 honored. Forged PTB accepted; next response shrunk. (ICMPv6 Echo + forged PTB)
- DE host (Düsseldorf): Type 2 honored. Forged PTB accepted; next response shrunk. (ICMPv6 Echo + forged PTB)
- NL host (go6lab): Type 2 honored. Forged PTB accepted; next response shrunk. (ICMPv6 Echo + forged PTB)
- ITA host (Karsolink): Type 2 honored. Forged PTB accepted; next response shrunk. (ICMPv6 Echo + forged PTB)
- SLO host (6connect): Type 2 honored. Forged PTB accepted; next response shrunk. (ICMPv6 Echo + forged PTB)
- SLO host (T-2): Type 2 honored. Forged PTB accepted; next response shrunk. (ICMPv6 Echo + forged PTB)
Why they disagree - measurement artifact: One vantage's probe didn't generate enough data to detect segment shrinkage (natural reply too small, or no second response). The other vantage's verdict is the meaningful one.
Failure detail - what to grep in your logs
| vantage | our source | your target | method | result | tested (UTC) |
|---|---|---|---|---|---|
| belgrade | 2a09:ab81::91 | 2a02:23d0:0:1:0:1:1:1 | icmp6-echo | inconclusive | 2026-09-23T10:34:23Z |
| berlin | 2a06:d1c1:10b::cccc | 2a02:23d0:0:1:0:1:1:1 | icmp6-echo | honored | 2026-09-23T10:34:24Z |
| duseldorf | 2a06:d1c1:10d::aaaa | 2a02:23d0:0:1:0:1:1:1 | icmp6-echo | honored | 2026-09-23T10:34:22Z |
| go6lab | 2a00:8642:42::75 | 2a02:23d0:0:1:0:1:1:1 | icmp6-echo | honored | 2026-09-23T10:34:44Z |
| karsolink | 2a12:d8c0:105a:9001::a154 | 2a02:23d0:0:1:0:1:1:1 | icmp6-echo | honored | 2026-09-23T10:34:25Z |
| odin | 2607:fae0:a000::42 | 2a02:23d0:0:1:0:1:1:1 | icmp6-echo | honored | 2026-09-23T10:34:22Z |
| t2 | 2a01:261:313:b814:2a0:98ff:fe5b:13e4 | 2a02:23d0:0:1:0:1:1:1 | icmp6-echo | honored | 2026-09-23T10:34:23Z |
Attempt log (belgrade):
icmp6-echo→ inconclusive (reply 1460 B before PTB): no Echo Reply after PTB (probe 1500B)dns-tcp→ no_tcp: connect failed: [Errno 111] Connection refusedtls→ no_tcp: TLS connect failedhttp→ no_tcp: tcp/80 not open
Attempt log (berlin):
icmp6-echo→ honored (honored by fragmenting its reply into 2 via the IPv6 Fragment Header, rather than resizing)dns-tcp→ no_tcp: connect failed: [Errno 111] Connection refusedtls→ no_tcp: TLS connect failedhttp→ no_tcp: tcp/80 not open
Attempt log (duseldorf):
icmp6-echo→ honored (honored by fragmenting its reply into 2 via the IPv6 Fragment Header, rather than resizing)dns-tcp→ no_tcp: connect failed: [Errno 111] Connection refusedtls→ no_tcp: TLS connect failedhttp→ no_tcp: tcp/80 not open
Attempt log (go6lab):
icmp6-echo→ honored (honored by fragmenting its reply into 2 via the IPv6 Fragment Header, rather than resizing)dns-tcp→ no_tcp: connect failed: timed outtls→ no_tcp: TLS connect failedhttp→ no_tcp: tcp/80 not open
Attempt log (karsolink):
icmp6-echo→ honored (honored by fragmenting its reply into 2 via the IPv6 Fragment Header, rather than resizing)dns-tcp→ no_tcp: connect failed: [Errno 111] Connection refusedtls→ no_tcp: TLS connect failedhttp→ no_tcp: tcp/80 not open
Attempt log (odin):
icmp6-echo→ honored (honored by fragmenting its reply into 2 via the IPv6 Fragment Header, rather than resizing)dns-tcp→ no_tcp: connect failed: [Errno 111] Connection refusedtls→ no_tcp: TLS connect failedhttp→ no_tcp: tcp/80 not open
Attempt log (t2):
icmp6-echo→ honored (honored by fragmenting its reply into 2 via the IPv6 Fragment Header, rather than resizing)dns-tcp→ no_tcp: connect failed: [Errno 111] Connection refusedtls→ no_tcp: TLS connect failedhttp→ 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.
Where the path divergence is
Per-vantage probe + verdict (headline):
- belgrade: probe
icmp6-echo→ verdictinconclusive - berlin: probe
icmp6-echo→ verdicthonored - duseldorf: probe
icmp6-echo→ verdicthonored - go6lab: probe
icmp6-echo→ verdicthonored - karsolink: probe
icmp6-echo→ verdicthonored - odin: probe
icmp6-echo→ verdicthonored - t2: probe
icmp6-echo→ verdicthonored
Full per-method matrix (all four methods run at each vantage):
| vantage | icmp6-echo | dns-tcp | tls | http |
|---|---|---|---|---|
| belgrade | inconclusive | no_tcp | no_tcp | no_tcp |
| berlin | honored | no_tcp | no_tcp | no_tcp |
| duseldorf | honored | no_tcp | no_tcp | no_tcp |
| go6lab | honored | no_tcp | no_tcp | no_tcp |
| karsolink | honored | no_tcp | no_tcp | no_tcp |
| odin | honored | no_tcp | no_tcp | no_tcp |
| t2 | honored | no_tcp | no_tcp | no_tcp |
✓ 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): AS12778, AS3356, AS174.
- From belgrade (open/Type-2=inconclusive) the path enters an opaque hop at hop 8; from berlin (open/Type-2=honored) the same hop is in AS12778. Last common AS: AS12778. The disagreement is most likely rooted in one of those two transit ASes.
- From belgrade (open/Type-2=inconclusive) the path enters an opaque hop at hop 8; from duseldorf (open/Type-2=honored) the same hop is in AS12778. Last common AS: AS12778. The disagreement is most likely rooted in one of those two transit ASes.
- From belgrade (open/Type-2=inconclusive) the path enters AS12778 at hop 5; from go6lab (open/Type-2=honored) the same hop is in AS174. Last common AS: AS12778. The disagreement is most likely rooted in one of those two transit ASes.
- From belgrade (open/Type-2=inconclusive) the path enters AS12778 at hop 5; from karsolink (open/Type-2=honored) the same hop is in AS9002. Last common AS: AS12778. The disagreement is most likely rooted in one of those two transit ASes.
- From belgrade (open/Type-2=inconclusive) the path enters an opaque hop at hop 6; from odin (open/Type-2=honored) the same hop is in AS12778. Last common AS: AS12778. The disagreement is most likely rooted in one of those two transit ASes.
- From belgrade (open/Type-2=inconclusive) the path enters an opaque hop at hop 6; from t2 (open/Type-2=honored) the same hop is in AS12778. Last common AS: AS12778. The disagreement is most likely rooted in one of those two transit ASes.
- From berlin (open/Type-2=honored) the path enters AS3356 at hop 6; from go6lab (open/Type-2=honored) the same hop is in AS174. Last common AS: AS12778. The disagreement is most likely rooted in one of those two transit ASes.
- From berlin (open/Type-2=honored) the path enters AS3356 at hop 6; from odin (open/Type-2=honored) the same hop is in AS12778. Last common AS: AS12778. The disagreement is most likely rooted in one of those two transit ASes.
- From berlin (open/Type-2=honored) the path enters AS3356 at hop 6; from t2 (open/Type-2=honored) the same hop is in AS12778. Last common AS: AS12778. The disagreement is most likely rooted in one of those two transit ASes.
- From duseldorf (open/Type-2=honored) the path enters AS3356 at hop 6; from go6lab (open/Type-2=honored) the same hop is in AS174. Last common AS: AS12778. The disagreement is most likely rooted in one of those two transit ASes.
- From duseldorf (open/Type-2=honored) the path enters AS3356 at hop 6; from odin (open/Type-2=honored) the same hop is in AS12778. Last common AS: AS12778. The disagreement is most likely rooted in one of those two transit ASes.
- From duseldorf (open/Type-2=honored) the path enters AS3356 at hop 6; from t2 (open/Type-2=honored) the same hop is in AS12778. Last common AS: AS12778. The disagreement is most likely rooted in one of those two transit ASes.
- From go6lab (open/Type-2=honored) the path enters AS174 at hop 5; from karsolink (open/Type-2=honored) the same hop is in AS9002. Last common AS: AS12778. The disagreement is most likely rooted in one of those two transit ASes.
- From go6lab (open/Type-2=honored) the path enters AS50673 at hop 3; from odin (open/Type-2=honored) the same hop is in AS56635. Last common AS: AS12778. The disagreement is most likely rooted in one of those two transit ASes.
- From go6lab (open/Type-2=honored) the path enters AS174 at hop 5; from t2 (open/Type-2=honored) the same hop is in AS12778. Last common AS: AS12778. The disagreement is most likely rooted in one of those two transit ASes.
- From karsolink (open/Type-2=honored) the path enters AS9002 at hop 5; from odin (open/Type-2=honored) the same hop is in AS12778. Last common AS: AS12778. The disagreement is most likely rooted in one of those two transit ASes.
- From karsolink (open/Type-2=honored) the path enters AS9002 at hop 5; from t2 (open/Type-2=honored) the same hop is in AS12778. Last common AS: AS12778. 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) open
filter likely at: (none) · min PMTU on path: 1500
4/4
Echo small (56B) 41.2ms
4/4
Echo 1500B (DF) 41.3ms
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 | 0.2ms | 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 | 0.3ms | 0% | AS13004 | SOX - Serbian Open Exchange DOO, RS |
| 4 | 2001:67c:128c::699 | 17.9ms | 0% | - | NA |
| 5 | 2a02:d68:c:1002::2 | 41.6ms | 0% | AS12778 | SGN - MEGA M, d.o.o., SI |
tracepath -6
1?: [LOCALHOST] 0.012ms pmtu 1500
1: _gateway 0.575ms
1: _gateway 0.631ms
2: sox-pn.sox.rs 0.547ms
3: 2001:7f8:1e:8::3d 0.801ms asymm 2
4: 2001:67c:128c::699 18.477ms
5: 2a02:d68:c:1002::2 42.481ms reached
Resume: pmtu 1500 hops 5 back 6 From DE host (Berlin) openRFC 4890 ✓
filter likely at: (none) · min PMTU on path: 1500
4/4
Echo small (56B) 32.1ms
4/4
Echo 1500B (DF) 32.2ms
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 | 0.2ms | 0%* | AS59645 | WYBT-NET - Tobias Fiebig, DE |
| 2 | ae0-2453.cr10.ber01.lwlcom.net 2a06:d1c0::dead:beef:1c02 | 0.5ms | 0%* | AS59645 | WYBT-NET - Tobias Fiebig, DE |
| 3 | ae0-150.cr10.fra01.lwlcom.net 2a00:c380:b200:230::174 | 10.0ms | 0% | AS50629 | LWLCOM - LWLcom GmbH, DE |
| 4 | ae0-20.cr10.fra07.lwlcom.net 2a00:c380:b200:230::31 | 10.1ms | 0% | AS50629 | LWLCOM - LWLcom GmbH, DE |
| 5 | * | - | 50% | - | |
| 6 | lo0.0.bar1.Ljubljana1.level3.net 2001:4c08::53 | 31.9ms | 0% | AS3356 | LEVEL3 - Level 3 Parent, LLC, US |
| 7 | 2001:1900:5:2:2::259a | 31.8ms | 0% | AS3356 | LEVEL3 - Level 3 Parent, LLC, US |
| 8 | 2a02:d68:2:4::1 | 31.8ms | 0% | AS12778 | SGN - MEGA M, d.o.o., SI |
| 9 | 2a02:d68:c:1002::2 | 32.3ms | 0% | AS12778 | SGN - MEGA M, d.o.o., SI |
Rate-limited ICMPv6: hop 5 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).
tracepath -6
1?: [LOCALHOST] 0.021ms pmtu 1500
1: xe-0-0-13-178.gw01.ber01.as59645.net 1.001ms
1: xe-0-0-13-178.gw01.ber01.as59645.net 0.415ms
2: ae0-2453.cr10.ber01.lwlcom.net 0.858ms
3: ae0-150.cr10.fra01.lwlcom.net 10.301ms asymm 7
4: ae0-20.cr10.fra07.lwlcom.net 10.704ms asymm 6
5: no reply
6: lo0.0.bar1.Ljubljana1.level3.net 32.812ms asymm 7
7: 2001:1900:5:2:2::259a 32.101ms asymm 8
8: 2a02:d68:2:4::1 32.074ms asymm 9
9: 2a02:d68:c:1002::2 32.516ms reached
Resume: pmtu 1500 hops 9 back 10 From DE host (Düsseldorf) openRFC 4890 ✓
filter likely at: (none) · min PMTU on path: 1500
4/4
Echo small (56B) 26.1ms
4/4
Echo 1500B (DF) 26.1ms
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 | 0.1ms | 0%* | AS59645 | WYBT-NET - Tobias Fiebig, DE |
| 2 | eth1-0-12-h5594.edge5-dus1.bb.wiit.network 2001:4ba0:92f4:3::1 | 1.0ms | 0% | AS24961 | MYLOC-AS - WIIT AG, DE |
| 3 | lag13.agr3-dus3.bb.wiit.network 2001:4ba0:ffe9:7d::1 | 1.1ms | 0% | AS24961 | MYLOC-AS - WIIT AG, DE |
| 4 | lag11.core3-dus1.bb.wiit.network 2001:4ba0:ffe9:115::3 | 0.2ms | 0% | AS24961 | MYLOC-AS - WIIT AG, DE |
| 5 | * | - | 0% | - | |
| 6 | lo0.0.bar1.Ljubljana1.level3.net 2001:4c08::53 | 25.9ms | 0% | AS3356 | LEVEL3 - Level 3 Parent, LLC, US |
| 7 | 2001:1900:5:2:2::259a | 25.9ms | 0% | AS3356 | LEVEL3 - Level 3 Parent, LLC, US |
| 8 | 2a02:d68:2:4::1 | 25.7ms | 0% | AS12778 | SGN - MEGA M, d.o.o., SI |
| 9 | 2a02:d68:c:1002::2 | 26.3ms | 0% | AS12778 | SGN - MEGA M, d.o.o., SI |
tracepath -6
1?: [LOCALHOST] 0.021ms pmtu 1500
1: xe-0-0-12-142.gw01.dus01.as59645.net 0.386ms
1: xe-0-0-12-142.gw01.dus01.as59645.net 0.473ms
2: eth1-0-12-h5594.edge5-dus1.bb.wiit.network 1.235ms
3: no reply
4: lag11.core3-dus1.bb.wiit.network 0.466ms
5: no reply
6: lo0.0.bar1.Ljubljana1.level3.net 26.316ms
7: 2001:1900:5:2:2::259a 26.257ms
8: 2a02:d68:2:4::1 26.157ms
9: 2a02:d68:c:1002::2 26.453ms reached
Resume: pmtu 1500 hops 9 back 9 From NL host (go6lab) openRFC 4890 ✓
filter likely at: (none) · min PMTU on path: 1500
4/4
Echo small (56B) 166.1ms
4/4
Echo 1500B (DF) 32.4ms
yes
Type 1 dest-unreach
-
TCP responds on
Path (traceroute + mtr + PTR)
| # | IP / PTR | RTT | mtr loss | AS | AS holder |
|---|---|---|---|---|---|
| 1 | 2a00:8642:42::2 | 5.2ms | 0% | AS203993 | GNA-DC1-AS - S.J.M. Steffann, NL |
| 2 | gw.friends.steffann.nl 2a00:8642:1000:f000::1 | 2.6ms | 0%* | AS203993 | GNA-DC1-AS - S.J.M. Steffann, NL |
| 3 | 2a00:1ca8:1::194 | 3.0ms | 0% | AS50673 | Serverius-as - Serverius Holding B.V., NL |
| 4 | 2a03:3f40::10:41 | 3.4ms | 0% | AS50673 | Serverius-as - Serverius Holding B.V., NL |
| 5 | 2001:978:2:40::3:1 | 3.6ms | 0% | AS174 | COGENT-174 - Cogent Communications, LLC, US |
| 6 | be3458.ccr42.ams03.atlas.cogentco.com 2001:550:0:1000::9a36:27b9 | 5.3ms | 0% | AS174 | COGENT-174 - Cogent Communications, LLC, US |
| 7 | be2950.ccr42.fra05.atlas.cogentco.com 2001:550:0:1000::9a36:482a | 12.0ms | 0% | AS174 | COGENT-174 - Cogent Communications, LLC, US |
| 8 | be7944.ccr22.muc03.atlas.cogentco.com 2001:550:0:1000::9a36:4b61 | 18.1ms | 0% | AS174 | COGENT-174 - Cogent Communications, LLC, US |
| 9 | be9456.ccr82.vie01.atlas.cogentco.com 2001:550:0:1000::9a36:3f8d | 21.6ms | 0% | AS174 | COGENT-174 - Cogent Communications, LLC, US |
| 10 | be4079.agr61.vie01.atlas.cogentco.com 2001:550:0:1000::8275:3242 | 23.8ms | 0% | AS174 | COGENT-174 - Cogent Communications, LLC, US |
| 11 | be3189.rcr61.lju01.atlas.cogentco.com 2001:550:0:1000::9a36:4ac5 | 30.2ms | 0% | AS174 | COGENT-174 - Cogent Communications, LLC, US |
| 12 | be9462.nr61.b021176-0.lju01.atlas.cogentco.com 2001:550:0:1000::9a19:11a5 | 30.1ms | 0% | AS174 | COGENT-174 - Cogent Communications, LLC, US |
| 13 | 2001:978:2:39::8:2 | 32.2ms | 0% | AS174 | COGENT-174 - Cogent Communications, LLC, US |
| 14 | 2a02:d68:2:9::1 | 29.8ms | 0% | AS12778 | SGN - MEGA M, d.o.o., SI |
| 15 | 2a02:d68:c:1002::2 | 31.6ms | 0% | AS12778 | SGN - MEGA M, d.o.o., SI |
tracepath -6
1?: [LOCALHOST] 0.039ms pmtu 1500
1: 2a00:8642:42::2 2.574ms
1: 2a00:8642:42::2 2.038ms
2: no reply
3: 2a00:1ca8:1::194 7.238ms
4: 2a03:3f40::10:41 7.052ms
5: 2001:978:2:40::3:1 4.314ms
6: be3458.ccr42.ams03.atlas.cogentco.com 7.081ms
7: be2950.ccr42.fra05.atlas.cogentco.com 15.368ms
8: be5516.ccr21.muc03.atlas.cogentco.com 19.005ms
9: be9456.ccr82.vie01.atlas.cogentco.com 24.954ms
10: be7244.agr62.vie01.atlas.cogentco.com 23.863ms
11: be9461.rcr62.lju01.atlas.cogentco.com 28.926ms
12: be3191.nr61.b021176-0.lju01.atlas.cogentco.com 28.981ms
13: 2001:978:2:39::8:2 32.461ms asymm 14
14: 2a02:d68:2:9::1 31.762ms
15: 2a02:d68:c:1002::2 38.436ms reached
Resume: pmtu 1500 hops 15 back 15 From ITA host (Karsolink) openRFC 4890 ✓
filter likely at: (none) · min PMTU on path: 1500
4/4
Echo small (56B) 28.7ms
4/4
Echo 1500B (DF) 33.9ms
yes
Type 1 dest-unreach
443,80
TCP responds on
Path (traceroute + mtr + PTR)
| # | IP / PTR | RTT | mtr loss | AS | AS holder |
|---|---|---|---|---|---|
| 1 | * | - | - | - | |
| 2 | * | - | 0%* | - | |
| 3 | 2a12:d8c0:109f:106::a2 | 3.2ms | 40% | AS204471 | KARSOLINK - 2S Computers SRL, IT |
| 4 | 2a02:2d8:1:b80d:232a | 7.7ms | 0% | - | |
| 5 | RT.IRX.VIE.AT.retn.net 2a02:2d8::57f5:e0af | 15.5ms | 0% | AS9002 | RETN-AS - RETN Limited, GB |
| 6 | 2001:978:2:2a::e7:1 | 10.8ms | 0% | AS174 | COGENT-174 - Cogent Communications, LLC, US |
| 7 | be10063.agr72.mil02.atlas.cogentco.com 2001:550:0:1000::9a19:c5d | 10.6ms | 0% | AS174 | COGENT-174 - Cogent Communications, LLC, US |
| 8 | port-channel5653.ccr92.mil02.atlas.cogentco.com 2001:550:0:1000::8275:2b5 | 10.1ms | 0% | AS174 | COGENT-174 - Cogent Communications, LLC, US |
| 9 | 2a02:d68:c:1002::2 | 21.8ms | 0% | AS12778 | SGN - MEGA M, d.o.o., SI |
Rate-limited ICMPv6: hop 3 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).
tracepath -6
1?: [LOCALHOST] 0.031ms pmtu 1500
1: no reply
2: no reply
3: 2a12:d8c0:101f:6::1 9.892ms
4: ae8-202.rt.clr.mil.it.retn.net 7.871ms asymm 5
5: rt.irx.mrs.fr.retn.net 14.643ms
6: 2001:688:0:3:9::119 11.805ms
7: 2a02:d68:c:1002::2 36.979ms reached
Resume: pmtu 1500 hops 7 back 10 From SLO host (6connect) openRFC 4890 ✓
filter likely at: (none) · min PMTU on path: 1500
4/4
Echo small (56B) 1.4ms
4/4
Echo 1500B (DF) 1.4ms
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 | 1.8ms | 0%* | AS8038 | 6CONNECT - 6connect, Inc., US |
| 2 | ccr-to-fw-ccr1-gw-lju.6connect.com 2607:fae0:a000:2::2 | 0.7ms | 0%* | AS8038 | 6CONNECT - 6connect, Inc., US |
| 3 | 2a03:a100:0:201:1::1 | 0.7ms | 0% | AS56635 | XENYA - XENYA inzeniring, proizvodnja in trgovina, d.o.o. Ljubljana, SI |
| 4 | 2001:7f8:46::1:2778 @SIX | 1.1ms | 0% | AS51988 | ARNES-SIX - ARNES, SI |
| 5 | 2a02:d68:2:9::1 | 1.1ms | 0% | AS12778 | SGN - MEGA M, d.o.o., SI |
| 6 | 2a02:d68:c:1002::2 | 1.3ms | 0% | AS12778 | SGN - MEGA M, d.o.o., SI |
tracepath -6
1?: [LOCALHOST] 0.024ms pmtu 9000
1: fw1-lju.6connect.com 0.832ms
1: fw1-lju.6connect.com 0.690ms
2: no reply
3: 2a03:a100:0:201:1::1 1.285ms
4: 2a03:a100:0:201:1::1 0.977ms pmtu 1500
4: 2001:7f8:46::1:2778 1.280ms
5: 2a02:d68:2:9::1 203.792ms asymm 6
6: 2a02:d68:c:1002::2 1.601ms reached
Resume: pmtu 1500 hops 6 back 6 From SLO host (T-2) openRFC 4890 ✓
filter likely at: (none) · min PMTU on path: 1500
4/4
Echo small (56B) 3.0ms
4/4
Echo 1500B (DF) 3.3ms
yes
Type 1 dest-unreach
443,80
TCP responds on
Path (traceroute + mtr + PTR)
| # | IP / PTR | RTT | mtr loss | AS | AS holder |
|---|---|---|---|---|---|
| 1 | * | - | - | - | |
| 2 | 2a01:260:1::225 | 6.7ms | 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 | 5.9ms | 0%* | AS34779 | T-2-AS - T-2, d.o.o., SI |
| 4 | 2001:7f8:46::1:2778 @SIX | 6.3ms | 0% | AS51988 | ARNES-SIX - ARNES, SI |
| 5 | 2a02:d68:2:9::1 | 6.7ms | 0% | AS12778 | SGN - MEGA M, d.o.o., SI |
| 6 | 2a02:d68:c:1002::2 | 6.6ms | 0% | AS12778 | SGN - MEGA M, d.o.o., SI |
tracepath -6
1?: [LOCALHOST] 0.024ms pmtu 1500
1: no reply
2: 2a01:260:1::225 5.744ms
3: 2a01-260-1-1--9c.core6.t-2.net 2.103ms
4: 2001:7f8:46:0:1:0:1:2778 3.794ms
5: 2a02:d68:2:4::1 4.981ms
6: 2a02:d68:c:1002::2 2.863ms reached
Resume: pmtu 1500 hops 6 back 6