AS210218 - OpenFiber-Italy Open FiberPI/PARPKI ✓ 2/2ASPA -

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IPv6 prefix announced, but nothing inside is responding yet. AS210218 announces 2 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: 2a09:e6c0:8::1 · (no live host found) · address space: mixed · prefixes announced: 2

prefix(es): 2a09:e6c0:8::/48, 2a09:e6c7:f800::/48

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 2020-08-26. IPv6 LAN: 2001:7f8:b:100:1d1:a521:218:76. Locations: -.

RPKI & ASPA

2 of 2 prefix(es) covered by a valid ROA.

PrefixRPKI stateReasonCovering VRP(s)
2a09:e6c0:8::/48✓ validmatched VRP (correct origin, length within maxLength)AS210218 /48 maxLen 48 (ripe); AS210218 /29 maxLen 29 (ripe)
2a09:e6c7:f800::/48✓ validmatched VRP (correct origin, length within maxLength)AS210218 /48 maxLen 48 (ripe); AS210218 /29 maxLen 29 (ripe)

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

We probed 30 arbitrary IPv6 address(es) inside AS210218's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2001:41a8:64::b at hop 24 - that router answers ICMPv6 Echo. This is not in AS210218'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 2026-05-25T12:35:13Z

Failure detail — what to grep in your logs
vantageour sourceyour targetmethodresulttested (UTC)
go6lab2a00:8642:42::752a09:e6c0:8::1icmp6-echono_echo2026-05-25T12:35:13Z
karsolink2a12:d8c0:105a:9001::a1542a09:e6c0:8::1icmp6-echono_echo2026-05-25T12:45:44Z
odin2607:fae0:a000::422a09:e6c0:8::1icmp6-echono_echo2026-05-25T12:34:49Z

Attempt log (go6lab):

  1. icmp6-echo → no_echo: no Echo Reply to 1300-byte probe
  2. dns-tcp → no_tcp: connect failed: timed out
  3. tls → no_tcp: TLS connect failed
  4. http → no_tcp: tcp/80 not open

Attempt log (karsolink):

  1. icmp6-echo → no_echo: no Echo Reply to 1300-byte probe
  2. dns-tcp → no_tcp: connect failed: [Errno 113] No route to host
  3. tls → no_tcp: TLS connect failed
  4. http → no_tcp: tcp/80 not open

Attempt log (odin):

  1. icmp6-echo → no_echo: no Echo Reply to 1300-byte probe
  2. dns-tcp → no_tcp: connect failed: timed out
  3. tls → no_tcp: TLS connect failed
  4. 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 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 AS6762 (SEABONE-NET) · 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 / PTRRTTmtr lossASAS holder
12a00:8642:42::31.3ms0%AS203993STEFFANN-DC-AS - S.J.M. Steffann, NL
2gw.friends.steffann.nl
2a00:8642:1000:f000::1		2.4ms0%*AS203993STEFFANN-DC-AS - S.J.M. Steffann, NL
32a00:1ca8:1::19417.9ms20%AS50673Serverius-as - Serverius Holding B.V., NL
42a03:3f40::10:4117.1ms0%AS50673Serverius-as - Serverius Holding B.V., NL
5*---
6*---
7be3500.rcr22.ams05.atlas.cogentco.com
2001:550:0:1000::9a36:3c1a		5.6ms50%AS174COGENT-174 - Cogent Communications, LLC, US
82001:978:3::a69.8ms0%AS174COGENT-174 - Cogent Communications, LLC, US
9rom2-loop0-v6.rom.seabone.net
2001:41a8:60::2		41.6ms0%AS6762SEABONE-NET - TELECOM ITALIA SPARKLE S.p.A., IT
102001:41a8:64::b35.6ms10%AS6762SEABONE-NET - TELECOM ITALIA SPARKLE S.p.A., IT
11*---
12*---
13*---
142001:41a8:64::b36.0ms60%AS6762SEABONE-NET - TELECOM ITALIA SPARKLE S.p.A., IT
15*---
16*---
17*---
182001:41a8:64::b37.2ms70%AS6762SEABONE-NET - TELECOM ITALIA SPARKLE S.p.A., IT
19*---
20*---
21*---
222001:41a8:64::b36.0ms70%AS6762SEABONE-NET - TELECOM ITALIA SPARKLE S.p.A., IT
23*---
24*---

Rate-limited ICMPv6: hop 3, hop 7, hop 10, hop 14, hop 18, hop 22 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.060ms pmtu 1500
 1:  2a00:8642:42::3                                       1.504ms 
 1:  2a00:8642:42::3                                       1.640ms 
 2:  no reply
 3:  2a00:1ca8:1::194                                      3.122ms 
 4:  2a03:3f40::10:41                                      2.952ms 
 5:  no reply
 6:  no reply
 7:  be3500.rcr22.ams05.atlas.cogentco.com                 5.480ms 
 8:  2001:978:3::a6                                        9.858ms asymm  9 
 9:  rom2-loop0-v6.rom.seabone.net                        75.431ms 
10:  2001:41a8:64::b                                      38.508ms asymm  9 
11:  no reply
12:  no reply
13:  no reply
14:  2001:41a8:64::b                                      36.047ms asymm  9 
15:  no reply
16:  no reply
17:  no reply
18:  2001:41a8:64::b                                      36.201ms asymm  9 
19:  no reply
20:  no reply
21:  no reply
22:  2001:41a8:64::b                                      36.318ms asymm  9 
23:  no reply
24:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500

From ITA host (Karsolink)   transit only unreachable

filter likely at: past AS6762 (SEABONE-NET) · 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 / PTRRTTmtr lossASAS holder
1*---
2*-0%*-
3*-10%-
42a02:2d8:1:b80d:232a7.9ms0%-
5RT.EQX.FKT.DE.retn.net
2a02:2d8::57f5:e0a2		19.6ms0%AS9002RETN-AS - RETN Limited, GB
62001:41a8:600:2::26916.0ms0%AS6762SEABONE-NET - TELECOM ITALIA SPARKLE S.p.A., IT
7rom2-loop0-v6.rom.seabone.net
2001:41a8:60::2		36.9ms0%AS6762SEABONE-NET - TELECOM ITALIA SPARKLE S.p.A., IT
82001:41a8:64::b35.2ms90%AS6762SEABONE-NET - TELECOM ITALIA SPARKLE S.p.A., IT
9*---
10*---
11*---
122001:41a8:64::b27.3ms10%AS6762SEABONE-NET - TELECOM ITALIA SPARKLE S.p.A., IT
13*---
14*---
15*---
162001:41a8:64::b27.6ms90%AS6762SEABONE-NET - TELECOM ITALIA SPARKLE S.p.A., IT
17*---
18*---
19*---
20*---
21*---
22*---
23*---
242001:41a8:64::b33.9ms-AS6762SEABONE-NET - TELECOM ITALIA SPARKLE S.p.A., IT

Rate-limited ICMPv6: hop 3, hop 8, hop 12, hop 16 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.030ms pmtu 1500
 1:  karsolink-01.net.karsolink.com                        0.876ms 
 1:  no reply
 2:  no reply
 3:  2a12:d8c0:101f:103::1                                 9.061ms 
 4:  ae8-202.rt.clr.mil.it.retn.net                        8.020ms asymm  5 
 5:  rt.eqx.fkt.de.retn.net                               20.331ms asymm  6 
 6:  2001:41a8:600:2::269                                 16.604ms asymm  7 
 7:  rom2-loop0-v6.rom.seabone.net                        34.071ms asymm  8 
 8:  2001:41a8:64::b                                      35.968ms asymm  7 
 9:  no reply
10:  no reply
11:  no reply
12:  2001:41a8:64::b                                      27.773ms asymm  7 
13:  no reply
14:  no reply
15:  no reply
16:  2001:41a8:64::b                                      27.546ms asymm  7 
17:  no reply
18:  no reply
19:  no reply
20:  2001:41a8:64::b                                      27.700ms asymm  7 
21:  no reply
22:  no reply
23:  no reply
24:  2001:41a8:64::b                                      27.572ms asymm  7 
     Too many hops: pmtu 1500
     Resume: pmtu 1500

From SLO host (6connect)   transit only unreachable

filter likely at: past AS6762 (SEABONE-NET) · 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 / PTRRTTmtr lossASAS holder
1fw1-lju.6connect.com
2607:fae0:a000::2		0.3ms0%*AS80386CONNECT - 6connect, Inc., US
2*---
32a03:a100:0:201:1::10.8ms10%AS56635XENYA - XENYA inzeniring, proizvodnja in trgovina, d.o.o. Ljubljana, SI
4e0-1.core1.lju1.he.net
2001:470:1:5be::1		1.8ms70%AS6939HURRICANE - Hurricane Electric LLC, US
5*---
6port-channel1.core1.zag2.he.net
2001:470:0:2ea::2		3.8ms30%AS6939HURRICANE - Hurricane Electric LLC, US
7*---
8e0-36.core2.rom1.he.net
2001:470:0:4d4::2		22.6ms0%AS6939HURRICANE - Hurricane Electric LLC, US
9*---
10*---
11*---
12*---
132001:41a8:64::b19.5ms40%AS6762SEABONE-NET - TELECOM ITALIA SPARKLE S.p.A., IT
14*---
15*---
16*---
172001:41a8:64::b19.6ms80%AS6762SEABONE-NET - TELECOM ITALIA SPARKLE S.p.A., IT
18*---
19*---
20*---
212001:41a8:64::b19.6ms80%AS6762SEABONE-NET - TELECOM ITALIA SPARKLE S.p.A., IT
22*-0%-
23*---
24*---

Rate-limited ICMPv6: hop 3, hop 4, hop 6, hop 13, hop 17, hop 21 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.044ms pmtu 1500
 1:  fw1-lju.6connect.com                                  0.655ms 
 1:  fw1-lju.6connect.com                                  0.498ms 
 2:  no reply
 3:  2a03:a100:0:201:1::1                                  0.930ms 
 4:  e0-1.core1.lju1.he.net                                2.624ms 
 5:  no reply
 6:  port-channel1.core1.zag2.he.net                       4.232ms 
 7:  no reply
 8:  e0-36.core2.rom1.he.net                              21.295ms 
 9:  no reply
10:  no reply
11:  no reply
12:  no reply
13:  2001:41a8:64::b                                      19.874ms asymm  7 
14:  no reply
15:  no reply
16:  no reply
17:  2001:41a8:64::b                                      19.762ms asymm  7 
18:  no reply
19:  no reply
20:  no reply
21:  2001:41a8:64::b                                      20.268ms asymm  7 
22:  no reply
23:  no reply
24:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500