AS2598 - CNR Consiglio Nazionale delle RicerchePIRPKI -ASPA -

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IPv6 prefix announced, but nothing inside is responding yet. AS2598 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: 2001:67c:1b08::1 · (no live host found) · address space: PI · prefixes announced: 1

prefix(es): 2001:67c:1b08::/48

MIX-IT / NAMEX / MINAP / TOP-IX / VSIX / EQUINIX-MILAN / BGPX-ROME / NAMEX-BARI / PCIX / DECIX-PALERMO peering

Not an MIX-IT / NAMEX / MINAP / TOP-IX / VSIX / EQUINIX-MILAN / BGPX-ROME / NAMEX-BARI / PCIX / DECIX-PALERMO member, but our traceroute path crosses the MIX-IT / NAMEX / MINAP / TOP-IX / VSIX / EQUINIX-MILAN / BGPX-ROME / NAMEX-BARI / PCIX / DECIX-PALERMO LAN from SLO host (6connect) - reached via an MIX-IT / NAMEX / MINAP / TOP-IX / VSIX / EQUINIX-MILAN / BGPX-ROME / NAMEX-BARI / PCIX / DECIX-PALERMO-resident transit operator.

RPKI & ASPA

0 of 1 prefix(es) covered by a valid ROA, 1 not-found.

PrefixRPKI stateReasonCovering VRP(s)
2001:67c:1b08::/48- not-foundno covering VRP

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

We probed 15 arbitrary IPv6 address(es) inside AS2598's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2001:760:ffff:10c::17 at hop 11 - that router answers ICMPv6 Echo. This is not in AS2598'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 2026-05-25T12:28:30Z

Failure detail — what to grep in your logs
vantageour sourceyour targetmethodresulttested (UTC)
go6lab2a00:8642:42::752001:67c:1b08::1icmp6-echono_echo2026-05-25T12:28:30Z
karsolink2a12:d8c0:105a:9001::a1542001:67c:1b08::1icmp6-echono_echo2026-05-25T12:30:10Z
odin2607:fae0:a000::422001:67c:1b08::1icmp6-echono_echo2026-05-25T12:28:23Z

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: timed out
  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 AS137 (ASGARR) · 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::30.8ms0%AS203993STEFFANN-DC-AS - S.J.M. Steffann, NL
2gw.friends.steffann.nl
2a00:8642:1000:f000::1		1.2ms0%*AS203993STEFFANN-DC-AS - S.J.M. Steffann, NL
32a00:1ca8:1::1941.8ms0%AS50673Serverius-as - Serverius Holding B.V., NL
42a03:3f40::10:334.2ms0%AS50673Serverius-as - Serverius Holding B.V., NL
5ae22-404.ams10.core-backbone.com
2a01:4a0:1338:155::1		4.8ms0%AS201011CORE-BACKBONE - Core-Backbone GmbH, DE
6*-0%-
7garr-ias-geant-gw.mil2.it.geant.net
2001:798:1::51		23.9ms0%AS20965GEANT - GEANT Vereniging, NL
8garr-ias-garr-gw.mil2.it.geant.net
2001:798:1::52		40.5ms0%AS20965GEANT - GEANT Vereniging, NL
9re2-mi02-rs1-mi02.mi02.garr.net
2001:760:ffff:ffee::220:210		37.9ms0%AS137ASGARR - Consortium GARR, IT
10rs1-mi02-rl2-rm02.rm02.garr.net
2001:760:ffff:ffbb::181:74		35.2ms0%AS137ASGARR - Consortium GARR, IT
112001:760:ffff:10c::1735.4ms0%AS137ASGARR - Consortium GARR, IT
12*---
13*---
14*---
15*---
16*---
17*---
18*---
19*---
20*---
21*---
22*---
23*---
24*---

tracepath -6

 1?: [LOCALHOST]                        0.032ms pmtu 1500
 1:  2a00:8642:42::3                                       1.849ms 
 1:  2a00:8642:42::3                                       2.484ms 
 2:  no reply
 3:  2a00:1ca8:1::194                                      4.574ms 
 4:  2a03:3f40::10:33                                      7.510ms 
 5:  ae22-404.ams10.core-backbone.com                      6.409ms 
 6:  no reply
 7:  garr-ias-geant-gw.mil2.it.geant.net                  23.978ms 
 8:  garr-ias-garr-gw.mil2.it.geant.net                   40.672ms asymm 14 
 9:  re2-mi02-rs1-rm02.rm02.garr.net                      36.406ms asymm 13 
10:  rs1-rm02-rl2-rm02.rm02.garr.net                      37.121ms asymm 14 
11:  2001:760:ffff:10c::17                                37.044ms asymm 15 
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
19:  no reply
20:  no reply
21:  no reply
22:  no reply
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 AS137 (ASGARR) · 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*-0%*-
2*---
32a12:d8c0:109f:106::a23.2ms0%AS204471KARSOLINK - 2S Computers SRL, IT
42001:7f8:5f:ffff::123.4ms0%-NA
5rl1-pd02-rs1-pd01.pd01.garr.net
2001:760:ffff:ffbb::181:21		8.5ms0%AS137ASGARR - Consortium GARR, IT
6rs1-pd02-rs1-bo01.bo01.garr.net
2001:760:ffff:ffbb::181:17		11.4ms0%AS137ASGARR - Consortium GARR, IT
7rs1-bo01-rs1-rm02.rm02.garr.net
2001:760:ffff:ffbb::181:76		13.2ms0%AS137ASGARR - Consortium GARR, IT
8rs1-rm02-rl2-rm02.rm02.garr.net
2001:760:ffff:ffbb::181:87		12.7ms0%AS137ASGARR - Consortium GARR, IT
92001:760:ffff:10c::1715.1ms0%AS137ASGARR - Consortium GARR, IT
10*---
11*---
12*---
13*---
14*---
15*---
16*---
17*---
18*---
19*---
20*---
21*---
22*---
23*---
24*---

tracepath -6

 1?: [LOCALHOST]                        0.028ms pmtu 1500
 1:  karsolink-01.net.karsolink.com                        0.559ms 
 1:  karsolink-01.net.karsolink.com                        0.545ms 
 2:  2a12:d8c0:109f:121::a1                                0.625ms 
 3:  2a12:d8c0:109f:106::a2                                3.474ms 
 4:  2001:7f8:5f:ffff::12                                  3.969ms 
 5:  rl1-pd02-rs1-pd02.pd02.garr.net                      11.957ms 
 6:  rs1-pd01-rs1-mi01.mi01.garr.net                       8.340ms asymm  5 
 7:  rs1-bo01-rs1-rm02.rm02.garr.net                      13.367ms asymm  5 
 8:  rs1-rm02-rl2-rm02.rm02.garr.net                      13.197ms asymm  6 
 9:  2001:760:ffff:10c::17                                15.741ms asymm  7 
10:  no reply
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
19:  no reply
20:  no reply
21:  no reply
22:  no reply
23:  no reply
24:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500

From SLO host (6connect)   transit only unreachable

filter likely at: past AS137 (ASGARR) · 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		0.2ms0%*AS80386CONNECT - 6connect, Inc., US
2*-0%*-
3*-10%-
42a00:ee0:1:15::22.2ms0%AS5603SIOL-NET - Telekom Slovenije, d.d., SI
52a11:4142:20020.9ms0%-
62620:107:4008:e85::28.1ms0%-NA
7garr-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:a5d0:137:39		8.1ms0%-NA
8re1-mi02-rs1-mi02.mi02.garr.net
2001:760:ffff:ffaa::180:156		8.7ms0%AS137ASGARR - Consortium GARR, IT
9rs1-mi02-rl2-rm02.rm02.garr.net
2001:760:ffff:ffbb::181:74		15.7ms0%AS137ASGARR - Consortium GARR, IT
102001:760:ffff:10c::1715.8ms0%AS137ASGARR - Consortium GARR, IT
11*---
12*---
13*---
14*---
15*---
16*---
17*---
18*---
19*---
20*---
21*---
22*---
23*---
24*---

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

tracepath -6

 1?: [LOCALHOST]                        0.025ms pmtu 1500
 1:  fw1-lju.6connect.com                                  1.473ms 
 1:  fw1-lju.6connect.com                                  2.393ms 
 2:  no reply
 3:  2a00:ee1:800:9::1                                     2.636ms 
 4:  2a00:ee0:1:10::2                                      1.347ms asymm  3 
 5:  2a11:4142:2002::                                      1.088ms asymm  6 
 6:  2620:107:4008:e85::2                                  8.538ms asymm  7 
 7:  garr-v6.mix-it.net                                    9.770ms asymm  6 
 8:  re1-mi02-rs1-mi02.mi02.garr.net                       8.904ms 
 9:  rs1-mi02-rl2-rm02.rm02.garr.net                      15.934ms asymm  8 
10:  2001:760:ffff:10c::17                                16.155ms asymm  9 
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
19:  no reply
20:  no reply
21:  no reply
22:  no reply
23:  no reply
24:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500