AS overview
Test target: 2a09:c3c0::1 · (no live host found) · address space: PA · prefixes announced: 1
prefix(es): 2a09:c3c0::/29
MIX-IT / NAMEX / MINAP / TOP-IX / VSIX / EQUINIX-MILAN / BGPX-ROME / NAMEX-BARI / PCIX / DECIX-PALERMO peering
MIX-IT / NAMEX / MINAP / TOP-IX / VSIX / EQUINIX-MILAN / BGPX-ROME / NAMEX-BARI / PCIX / DECIX-PALERMO member - Open peering, peering member, since 2021-05-03. IPv6 LAN: 2001:7f8:b:100:1d1:a520:9102:210. Locations: -.
RPKI & ASPA
1 of 1 prefix(es) covered by a valid ROA.
| Prefix | RPKI state | Reason | Covering VRP(s) |
|---|---|---|---|
2a09:c3c0::/29 | ✓ valid | matched VRP (correct origin, length within maxLength) | AS209102 /29 maxLen 29 (ripe) |
Random-IP probe (yarrp) into the AS' prefixes
We probed 15 arbitrary IPv6 address(es) inside AS209102's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2a0d:2640:209:102::2 at hop 23 - that router does not answer ICMPv6 Echo. This is not in AS209102'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
Type 2 active test inconclusive: no Echo Reply to 1300-byte probe.
method: ICMPv6 Echo + forged PTB, tested 2026-05-25T12:35:12Z
Failure detail — what to grep in your logs
| vantage | our source | your target | method | result | tested (UTC) |
|---|---|---|---|---|---|
| go6lab | 2a00:8642:42::75 | 2a09:c3c0::1 | icmp6-echo | no_echo | 2026-05-25T12:35:12Z |
| karsolink | 2a12:d8c0:105a:9001::a154 | 2a09:c3c0::1 | icmp6-echo | no_echo | 2026-05-25T12:45:39Z |
| odin | 2607:fae0:a000::42 | 2a09:c3c0::1 | icmp6-echo | no_echo | 2026-05-25T12:34:46Z |
Attempt log (go6lab):
icmp6-echo→ no_echo: no Echo Reply to 1300-byte probedns-tcp→ no_tcp: connect failed: [Errno 113] No route to hosttls→ no_tcp: TLS connect failedhttp→ no_tcp: tcp/80 not open
Attempt log (karsolink):
icmp6-echo→ no_echo: no Echo Reply to 1300-byte probedns-tcp→ no_tcp: connect failed: [Errno 113] No route to hosttls→ no_tcp: TLS connect failedhttp→ no_tcp: tcp/80 not open
Attempt log (odin):
icmp6-echo→ no_echo: no Echo Reply to 1300-byte probedns-tcp→ no_tcp: connect failed: [Errno 13] Permission deniedtls→ 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 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 one of our two source IPs, the drop is path-asymmetric — one transit on the asymmetric route is filtering, the other is not.
From NL host (go6lab) transit only unreachable
filter likely at: past AS57264 (OPTICONN-IT) · min PMTU on path: 1500
Path (traceroute + mtr + PTR)
| # | IP / PTR | RTT | mtr loss | AS | AS holder |
|---|---|---|---|---|---|
| 1 | 2a00:8642:42::3 | 1.5ms | 0% | AS203993 | STEFFANN-DC-AS - S.J.M. Steffann, NL |
| 2 | gw.friends.steffann.nl 2a00:8642:1000:f000::1 | 1.7ms | 0%* | AS203993 | STEFFANN-DC-AS - S.J.M. Steffann, NL |
| 3 | 2a00:1ca8:1::194 | 3.2ms | 0% | AS50673 | Serverius-as - Serverius Holding B.V., NL |
| 4 | 2a03:3f40::10:41 | 3.2ms | 0% | AS50673 | Serverius-as - Serverius Holding B.V., NL |
| 5 | 2001:978:2:40::3:1 | 3.9ms | 90% | AS174 | COGENT-174 - Cogent Communications, LLC, US |
| 6 | * | - | - | - | |
| 7 | be3343.ccr41.fra05.atlas.cogentco.com 2001:550:0:1000::9a36:3e8d | 11.4ms | 0% | AS174 | COGENT-174 - Cogent Communications, LLC, US |
| 8 | * | - | - | - | |
| 9 | port-channel5892.ccr92.mil02.atlas.cogentco.com 2001:550:0:1000::9a36:3ed9 | 25.1ms | 0% | AS174 | COGENT-174 - Cogent Communications, LLC, US |
| 10 | be4466.rcr51.b019138-1.mil02.atlas.cogentco.com 2001:550:0:1000::9a36:4bbe | 25.6ms | 0% | AS174 | COGENT-174 - Cogent Communications, LLC, US |
| 11 | 2001:978:2:2a::1c:2 | 30.3ms | 0% | AS174 | COGENT-174 - Cogent Communications, LLC, US |
| 12 | 2a0d:2640:209:102::2 | 30.4ms | 80% | AS57264 | OPTICONN-IT - OPTICONN SRL, IT |
Rate-limited ICMPv6: hop 5, hop 12 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).
tracepath -6
1?: [LOCALHOST] 0.045ms pmtu 1500
1: 2a00:8642:42::3 1.343ms
1: 2a00:8642:42::3 1.436ms
2: no reply
3: 2a00:1ca8:1::194 4.311ms
4: 2a03:3f40::10:41 2.963ms
5: no reply
6: no reply
7: be2950.ccr42.fra05.atlas.cogentco.com 11.823ms
8: no reply
9: port-channel5891.ccr91.mil02.atlas.cogentco.com 26.871ms
10: be5012.rcr51.b019138-1.mil02.atlas.cogentco.com 27.235ms
11: 2001:978:2:2a::1c:2 31.569ms
12: 2a0d:2640:209:102::2 30.920ms !H
Resume: pmtu 1500 From ITA host (Karsolink) transit only unreachable
filter likely at: past AS57264 (OPTICONN-IT) · min PMTU on path: 1500
Path (traceroute + mtr + PTR)
| # | IP / PTR | RTT | mtr loss | AS | AS holder |
|---|---|---|---|---|---|
| 1 | * | - | 0%* | - | |
| 2 | 2a12:d8c0:109f:121::a1 | 0.4ms | 0%* | AS204471 | KARSOLINK - 2S Computers SRL, IT |
| 3 | 2a12:d8c0:101f:6::1 | 10.0ms | 0% | AS204471 | KARSOLINK - 2S Computers SRL, IT |
| 4 | opticonn.minap.it 2001:7f8:c5::a505:7264:1 | 15.1ms | 0% | AS57264 | Opticonn s.r.l. |
| 5 | 2a0d:2640:209:102::2 | 15.0ms | 90% | AS57264 | OPTICONN-IT - OPTICONN SRL, IT |
Rate-limited ICMPv6: hop 5 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).
tracepath -6
1?: [LOCALHOST] 0.029ms pmtu 1500
1: karsolink-01.net.karsolink.com 0.808ms
1: karsolink-01.net.karsolink.com 0.876ms
2: 2a12:d8c0:109f:121::a1 1.106ms
3: 2a12:d8c0:101f:6::1 10.416ms
4: opticonn.minap.it 15.600ms
5: 2a0d:2640:209:102::2 20.232ms !H
Resume: pmtu 1500 From SLO host (6connect) transit only unreachable
filter likely at: past AS60501 (SIRIUSTEC-IT) · min PMTU on path: 1500
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 | * | - | 20% | - | |
| 4 | * | - | 50% | - | |
| 5 | * | - | - | - | |
| 6 | * | - | 20% | - | |
| 7 | * | - | - | - | |
| 8 | siriustechnology-v6.mix-it.net @MIX-IT / NAMEX / MINAP / TOP-IX / VSIX / EQUINIX-MILAN / BGPX-ROME / NAMEX-BARI / PCIX / DECIX-PALERMO 2001:7f8:b:100:1d1:a5d6:501:138 | 12.3ms | 0% | - | NA |
| 9 | 2a00:ae20:0:45::2 | 17.5ms | 0% | AS60501 | SIRIUSTEC-IT - Sirius Technology SRL, IT |
| 10 | 2a00:ae20:1209:102::2 | 17.4ms | 0% | AS60501 | SIRIUSTEC-IT - Sirius Technology SRL, IT |
| 11 | 2a00:ae20:1209:102::2 | 17.6ms | 0% | AS60501 | SIRIUSTEC-IT - Sirius Technology SRL, IT |
Rate-limited ICMPv6: hop 3, hop 4, 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: fw1-lju.6connect.com 0.421ms
1: fw1-lju.6connect.com 0.545ms
2: no reply
3: 2a03:a100:0:201:1::1 1.096ms
4: no reply
5: no reply
6: no reply
7: no reply
8: siriustechnology-v6.mix-it.net 12.699ms
9: 2a00:ae20:0:45::2 17.435ms
10: 2a00:ae20:1209:102::2 17.300ms
11: 2a00:ae20:1209:102::2 17.472ms !A
Resume: pmtu 1500