AS204326 - firstAS-gatet1 GATE T1 SRLPARPKI ✓ 3/3ASPA -

AS overview

Test target: 2a0d:9f40::1 · (no live host found) · address space: PA · prefixes announced: 3

prefix(es): 2a0d:9f40::/29, 2a09:3cc0::/29, 2a04:d00::/29

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

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

We probed 30 arbitrary IPv6 address(es) inside AS204326's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2001:7f8:c5::a520:4326:1 at hop 8 - that router does not answer ICMPv6 Echo. This is not in AS204326'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 2026-05-25T12:36:38Z

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)'

From NL host (go6lab)   transit only unreachable

filter likely at: past AS174 (COGENT-174) · min PMTU on path: 1500

Path (traceroute + mtr + PTR)

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

tracepath -6

 1?: [LOCALHOST]                        0.041ms pmtu 1500
 1:  2a00:8642:42::3                                       1.667ms 
 1:  2a00:8642:42::3                                       1.957ms 
 2:  gw.friends.steffann.nl                                2.476ms 
 3:  2a00:1ca8:1::194                                      3.128ms 
 4:  2a03:3f40::10:41                                      2.592ms 
 5:  no reply
 6:  2001:978:2:40::3:1                                    7.157ms !N
     Resume: pmtu 1500 

From ITA host (Karsolink)   transit only unreachable

filter likely at: no path · min PMTU on path: 1500

Path (traceroute + mtr + PTR)

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

tracepath -6

 1?: [LOCALHOST]                        0.035ms pmtu 1500
 1:  karsolink-01.net.karsolink.com                        0.853ms 
 1:  karsolink-01.net.karsolink.com                        0.719ms 
 2:  2a12:d8c0:109f:121::a1                                0.903ms 
 3:  2a12:d8c0:101f:6::1                                  10.590ms 
 4:  gatet1.minap.it                                      11.119ms 
 5:  no reply
 6:  no reply
 7:  no reply
 8:  no reply
 9:  no reply
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: no path · min PMTU on path: 1500

Path (traceroute + mtr + PTR)

Rate-limited ICMPv6: 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                                  0.554ms 
 1:  fw1-lju.6connect.com                                  0.461ms 
 2:  no reply
 3:  2a03:a100:0:201:1::1                                  1.522ms 
 4:  e0-1.core1.lju1.he.net                                3.229ms 
 5:  no reply
 6:  port-channel1.core1.zag2.he.net                       4.091ms 
 7:  no reply
 8:  gatet1.minap.it                                      14.135ms 
 9:  no reply
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