IPv6 prefix announced, but nothing inside is responding yet. AS60451 announces 1 IPv6 prefix(es) to the global routing table - that’s the part that BGP and our route-server scrape confirm. But our active discovery (curated hostnames, holder-derived domains, authoritative DNS NS/SOA/MX, certificate-transparency hostnames, RIPE Atlas, RDAP, IPv6 Hitlist) found no ICMPv6-responsive host inside the prefix on either vantage, and a yarrp pass against random addresses inside the prefix produced zero in-prefix hops (no router on the path through the AS replied with Time-Exceeded for any random target). That combination usually means the announcement is configured but the addresses inside aren’t in active use yet. The BGP route is there; the operational deployment is still ahead.
AS overview
Test target: 2a06:f280::1 · (no live host found) · address space: PA · prefixes announced: 1
prefix(es): 2a06:f280::/29
RPKI & ASPA
1 of 1 prefix(es) covered by a valid ROA.
| Prefix | RPKI state | Reason | Covering VRP(s) |
|---|---|---|---|
2a06:f280::/29 | ✓ valid | matched VRP (correct origin, length within maxLength) | AS60451 /29 maxLen 32 (ripe) |
Random-IP probe (yarrp) into the AS' prefixes
We probed 15 arbitrary IPv6 address(es) inside AS60451's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2a02:2d8:4:2807:232a:: at hop 24 - that router answers ICMPv6 Echo. This is not in AS60451'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 2026-05-25T12:34:14Z
Failure detail — what to grep in your logs
| vantage | our source | your target | method | result | tested (UTC) |
|---|---|---|---|---|---|
| go6lab | 2a00:8642:42::75 | 2a06:f280::1 | icmp6-echo | no_echo | 2026-05-25T12:34:14Z |
| karsolink | 2a12:d8c0:105a:9001::a154 | 2a06:f280::1 | icmp6-echo | no_echo | 2026-05-25T12:42:53Z |
| odin | 2607:fae0:a000::42 | 2a06:f280::1 | icmp6-echo | no_echo | 2026-05-25T12:33:52Z |
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 113] No route to hosttls→ 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: no path · min PMTU on path: 1500
0/4
Echo small (56B) -
0/4
Echo 1500B (DF) -
no
Type 1 dest-unreach
-
TCP responds on
Path (traceroute + mtr + PTR)
| # | IP / PTR | RTT | mtr loss | AS | AS holder |
|---|---|---|---|---|---|
| 1 | 2a00:8642:42::3 | 1.1ms | 0% | AS203993 | STEFFANN-DC-AS - S.J.M. Steffann, NL |
| 2 | * | - | 0%* | - | |
| 3 | 2a00:1ca8:1::194 | 2.9ms | 0% | AS50673 | Serverius-as - Serverius Holding B.V., NL |
| 4 | 2a03:3f40::10:33 | 5.3ms | 0% | AS50673 | Serverius-as - Serverius Holding B.V., NL |
| 5 | 2a02:2d8:1:a001:232a | 4.3ms | 0% | - | |
| 6 | RT.NMX.ROM.IT.retn.net 2a02:2d8::57f5:e08f | 29.2ms | 0% | AS9002 | RETN-AS - RETN Limited, GB |
| 7 | 2a02:2d8:4:2807:232a::1 | 28.8ms | 0% | AS9002 | RETN-AS - RETN Limited, GB |
| 8 | 2a02:2d8:4:2807:232a | 28.3ms | 0% | - | |
| 9 | 2a02:2d8:4:2807:232a::1 | 28.4ms | - | AS9002 | RETN-AS - RETN Limited, GB |
| 10 | 2a02:2d8:4:2807:232a | 28.6ms | 0% | - | |
| 11 | 2a02:2d8:4:2807:232a::1 | 29.4ms | - | AS9002 | RETN-AS - RETN Limited, GB |
| 12 | 2a02:2d8:4:2807:232a | 28.8ms | 0% | - | |
| 13 | 2a02:2d8:4:2807:232a::1 | 28.9ms | - | AS9002 | RETN-AS - RETN Limited, GB |
| 14 | 2a02:2d8:4:2807:232a | 28.8ms | 0% | - | |
| 15 | 2a02:2d8:4:2807:232a::1 | 29.5ms | - | AS9002 | RETN-AS - RETN Limited, GB |
| 16 | 2a02:2d8:4:2807:232a | 29.0ms | 0% | - | |
| 17 | 2a02:2d8:4:2807:232a::1 | 28.9ms | 90% | AS9002 | RETN-AS - RETN Limited, GB |
| 18 | 2a02:2d8:4:2807:232a | 28.3ms | 0% | - | |
| 19 | 2a02:2d8:4:2807:232a::1 | 28.5ms | - | AS9002 | RETN-AS - RETN Limited, GB |
| 20 | 2a02:2d8:4:2807:232a | 28.9ms | 0% | - | |
| 21 | 2a02:2d8:4:2807:232a::1 | 28.7ms | - | AS9002 | RETN-AS - RETN Limited, GB |
| 22 | 2a02:2d8:4:2807:232a | 28.4ms | 0% | - | |
| 23 | 2a02:2d8:4:2807:232a::1 | 29.4ms | - | AS9002 | RETN-AS - RETN Limited, GB |
| 24 | 2a02:2d8:4:2807:232a | 28.9ms | 0% | - |
Rate-limited ICMPv6: hop 17 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).
tracepath -6
1?: [LOCALHOST] 0.069ms pmtu 1500
1: 2a00:8642:42::3 1.886ms
1: 2a00:8642:42::3 1.481ms
2: gw.friends.steffann.nl 2.012ms
3: 2a00:1ca8:1::194 2.684ms
4: 2a03:3f40::10:33 6.128ms
5: ae1-499.RT.SRV.DRO.NL.retn.net 4.412ms
6: RT.NMX.ROM.IT.retn.net 29.456ms
7: 2a02:2d8:4:2807:232a::1 29.661ms
8: 2a02:2d8:4:2807:232a:: 28.820ms asymm 6
9: 2a02:2d8:4:2807:232a::1 29.038ms asymm 7
10: 2a02:2d8:4:2807:232a:: 28.871ms asymm 6
11: 2a02:2d8:4:2807:232a::1 29.495ms asymm 7
12: 2a02:2d8:4:2807:232a:: 29.017ms asymm 6
13: 2a02:2d8:4:2807:232a::1 29.534ms asymm 7
14: 2a02:2d8:4:2807:232a:: 29.059ms asymm 6
15: 2a02:2d8:4:2807:232a::1 29.503ms asymm 7
16: 2a02:2d8:4:2807:232a:: 29.292ms asymm 6
17: 2a02:2d8:4:2807:232a::1 28.760ms asymm 7
18: 2a02:2d8:4:2807:232a:: 28.801ms asymm 6
19: 2a02:2d8:4:2807:232a::1 29.128ms asymm 7
20: 2a02:2d8:4:2807:232a:: 29.828ms asymm 6
21: 2a02:2d8:4:2807:232a::1 29.757ms asymm 7
22: 2a02:2d8:4:2807:232a:: 29.108ms asymm 6
23: 2a02:2d8:4:2807:232a::1 29.359ms asymm 7
24: 2a02:2d8:4:2807:232a:: 29.739ms asymm 6
Too many hops: pmtu 1500
Resume: pmtu 1500 From ITA host (Karsolink) transit only unreachable
filter likely at: past AS9002 (RETN-AS) · min PMTU on path: 1500
0/4
Echo small (56B) -
0/4
Echo 1500B (DF) -
no
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 | 0.4ms | 0%* | AS204471 | KARSOLINK - 2S Computers SRL, IT |
| 2 | * | - | 0%* | - | |
| 3 | 2a12:d8c0:101f:103::1 | 8.4ms | 0% | AS204471 | KARSOLINK - 2S Computers SRL, IT |
| 4 | 2a02:2d8:1:b80d:232a | 7.8ms | 0% | - | |
| 5 | RT.NMX.ROM.IT.retn.net 2a02:2d8::57f5:e08f | 14.7ms | 0% | AS9002 | RETN-AS - RETN Limited, GB |
| 6 | 2a02:2d8:4:2807:232a::1 | 14.7ms | 90% | AS9002 | RETN-AS - RETN Limited, GB |
| 7 | 2a02:2d8:4:2807:232a | 14.8ms | 0% | - | |
| 8 | 2a02:2d8:4:2807:232a::1 | 14.6ms | 90% | AS9002 | RETN-AS - RETN Limited, GB |
| 9 | 2a02:2d8:4:2807:232a | 14.7ms | 0% | - | |
| 10 | * | - | 90% | - | |
| 11 | 2a02:2d8:4:2807:232a | 14.8ms | 0% | - | |
| 12 | * | - | - | - | |
| 13 | 2a02:2d8:4:2807:232a | 14.7ms | 0% | - | |
| 14 | * | - | 10% | - | |
| 15 | 2a02:2d8:4:2807:232a | 14.8ms | 0% | - | |
| 16 | * | - | - | - | |
| 17 | 2a02:2d8:4:2807:232a | 15.2ms | 0% | - | |
| 18 | * | - | - | - | |
| 19 | 2a02:2d8:4:2807:232a | 15.1ms | 0% | - | |
| 20 | * | - | 90% | - | |
| 21 | 2a02:2d8:4:2807:232a | 15.3ms | 0% | - | |
| 22 | 2a02:2d8:4:2807:232a::1 | 15.3ms | - | AS9002 | RETN-AS - RETN Limited, GB |
| 23 | 2a02:2d8:4:2807:232a | 15.2ms | 0% | - | |
| 24 | 2a02:2d8:4:2807:232a::1 | 15.2ms | - | AS9002 | RETN-AS - RETN Limited, GB |
Rate-limited ICMPv6: hop 6, hop 8, hop 10, hop 14, hop 20 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).
tracepath -6
1?: [LOCALHOST] 0.054ms pmtu 1500
1: karsolink-01.net.karsolink.com 0.937ms
1: karsolink-01.net.karsolink.com 0.832ms
2: no reply
3: 2a12:d8c0:101f:103::1 8.986ms
4: ae8-202.rt.clr.mil.it.retn.net 8.388ms asymm 5
5: rt.nmx.rom.it.retn.net 15.264ms
6: 2a02:2d8:4:2807:232a::1 15.188ms
7: 2a02:2d8:4:2807:232a:: 15.249ms asymm 5
8: 2a02:2d8:4:2807:232a::1 15.489ms asymm 6
9: 2a02:2d8:4:2807:232a:: 15.505ms asymm 5
10: 2a02:2d8:4:2807:232a::1 15.437ms asymm 6
11: 2a02:2d8:4:2807:232a:: 15.808ms asymm 5
12: 2a02:2d8:4:2807:232a::1 15.419ms asymm 6
13: 2a02:2d8:4:2807:232a:: 15.409ms asymm 5
14: 2a02:2d8:4:2807:232a::1 15.606ms asymm 6
15: 2a02:2d8:4:2807:232a:: 15.586ms asymm 5
16: 2a02:2d8:4:2807:232a::1 15.590ms asymm 6
17: 2a02:2d8:4:2807:232a:: 15.571ms asymm 5
18: 2a02:2d8:4:2807:232a::1 15.614ms asymm 6
19: 2a02:2d8:4:2807:232a:: 15.757ms asymm 5
20: 2a02:2d8:4:2807:232a::1 16.225ms asymm 6
21: 2a02:2d8:4:2807:232a:: 15.987ms asymm 5
22: 2a02:2d8:4:2807:232a::1 16.231ms asymm 6
23: 2a02:2d8:4:2807:232a:: 16.023ms asymm 5
24: 2a02:2d8:4:2807:232a::1 15.807ms asymm 6
Too many hops: pmtu 1500
Resume: pmtu 1500 From SLO host (6connect) transit only unreachable
filter likely at: no path · min PMTU on path: 1500
0/4
Echo small (56B) -
0/4
Echo 1500B (DF) -
no
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 | 0.3ms | 0%* | AS8038 | 6CONNECT - 6connect, Inc., US |
| 2 | * | - | - | - | |
| 3 | 2a03:a100:0:201:1::1 | 0.8ms | 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 | 1.9ms | 0% | AS6939 | HURRICANE - Hurricane Electric LLC, US |
| 5 | * | - | - | - | |
| 6 | port-channel1.core1.zag2.he.net 2001:470:0:2ea::2 | 4.1ms | 0% | AS6939 | HURRICANE - Hurricane Electric LLC, US |
| 7 | * | - | - | - | |
| 8 | e0-36.core2.rom1.he.net 2001:470:0:4d4::2 | 21.0ms | 0% | AS6939 | HURRICANE - Hurricane Electric LLC, US |
| 9 | 2a02:2d8:4:2807:232a::1 | 21.3ms | 0% | AS9002 | RETN-AS - RETN Limited, GB |
| 10 | 2a02:2d8:4:2807:232a | 21.3ms | 0% | - | |
| 11 | 2a02:2d8:4:2807:232a::1 | 21.4ms | 90% | AS9002 | RETN-AS - RETN Limited, GB |
| 12 | 2a02:2d8:4:2807:232a | 21.1ms | 0% | - | |
| 13 | 2a02:2d8:4:2807:232a::1 | 21.2ms | 90% | AS9002 | RETN-AS - RETN Limited, GB |
| 14 | 2a02:2d8:4:2807:232a | 21.2ms | 0% | - | |
| 15 | 2a02:2d8:4:2807:232a::1 | 21.2ms | - | AS9002 | RETN-AS - RETN Limited, GB |
| 16 | 2a02:2d8:4:2807:232a | 21.3ms | 0% | - | |
| 17 | 2a02:2d8:4:2807:232a::1 | 21.2ms | 90% | AS9002 | RETN-AS - RETN Limited, GB |
| 18 | 2a02:2d8:4:2807:232a | 21.5ms | 0% | - | |
| 19 | 2a02:2d8:4:2807:232a::1 | 22.8ms | - | AS9002 | RETN-AS - RETN Limited, GB |
| 20 | 2a02:2d8:4:2807:232a | 21.4ms | 0% | - | |
| 21 | 2a02:2d8:4:2807:232a::1 | 21.7ms | - | AS9002 | RETN-AS - RETN Limited, GB |
| 22 | 2a02:2d8:4:2807:232a | 21.7ms | 0% | - | |
| 23 | 2a02:2d8:4:2807:232a::1 | 21.9ms | - | AS9002 | RETN-AS - RETN Limited, GB |
| 24 | 2a02:2d8:4:2807:232a | 22.0ms | 0% | - |
Rate-limited ICMPv6: hop 11, hop 13, hop 17 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).
tracepath -6
1?: [LOCALHOST] 0.027ms pmtu 1500
1: fw1-lju.6connect.com 0.629ms
1: fw1-lju.6connect.com 0.520ms
2: no reply
3: 2a03:a100:0:201:1::1 0.933ms
4: no reply
5: no reply
6: port-channel1.core1.zag2.he.net 4.558ms
7: no reply
8: e0-36.core2.rom1.he.net 21.171ms
9: 2a02:2d8:4:2807:232a::1 21.237ms asymm 10
10: 2a02:2d8:4:2807:232a:: 21.185ms asymm 9
11: 2a02:2d8:4:2807:232a::1 21.278ms asymm 10
12: 2a02:2d8:4:2807:232a:: 21.509ms asymm 9
13: 2a02:2d8:4:2807:232a::1 21.201ms asymm 10
14: 2a02:2d8:4:2807:232a:: 21.522ms asymm 9
15: 2a02:2d8:4:2807:232a::1 21.900ms asymm 10
16: 2a02:2d8:4:2807:232a:: 21.281ms asymm 9
17: 2a02:2d8:4:2807:232a::1 21.487ms asymm 10
18: 2a02:2d8:4:2807:232a:: 21.676ms asymm 9
19: 2a02:2d8:4:2807:232a::1 21.569ms asymm 10
20: 2a02:2d8:4:2807:232a:: 21.609ms asymm 9
21: 2a02:2d8:4:2807:232a::1 21.754ms asymm 10
22: 2a02:2d8:4:2807:232a:: 21.605ms asymm 9
23: 2a02:2d8:4:2807:232a::1 21.667ms asymm 10
24: 2a02:2d8:4:2807:232a:: 21.676ms asymm 9
Too many hops: pmtu 1500
Resume: pmtu 1500