AS44993 - MobikPARFC 4890 ✓RPKI -ASPA -

AS overview

Test target: 2a00:1420:1:5::10 · ns1.mobik.si · address space: PA · prefixes announced: 1

prefix(es): 2a00:1420::/32

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

We probed 15 arbitrary IPv6 address(es) inside AS44993's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2001:978:2:39::6 at hop 19 - that router answers ICMPv6 Echo. This is not in AS44993's announced prefix; operationally it's the AS-edge / peering interface (often on a SIX 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

Vantage points disagree about Type 2 acceptance - transit ASes on one path may be filtering Type 2 even though the destination's stack accepts it on another path:

• NL host (go6lab): Type 2 honored. Forged PTB accepted; next response shrunk. (ICMPv6 Echo + forged PTB)
• ITA host (Karsolink): Type 2 partial. Some shrinkage but not down to 1280 bytes. (TLS handshake + forged PTB)
• SLO host (6connect): Type 2 honored. Forged PTB accepted; next response shrunk. (ICMPv6 Echo + forged PTB)

Why they disagree - different probe methods: These vantages picked different probe methods, so their verdicts are not directly comparable. The active test tries methods in order (icmp6-echo → dns-tcp → tls → http) and stops at the first that produces a definitive verdict; if the chosen method differs, the underlying evidence differs too. Most often this is because the path PMTU on one vantage is below 1500 B, so the natural Echo Reply is already fragmented and the icmp6-echo method falls through to a TCP-based one. This is largely a measurement artifact, not a destination-behaviour difference.

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)   openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

Path (traceroute + mtr + PTR)

Rate-limited ICMPv6: hop 6, hop 8 (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                                       1.873ms 
 1:  2a00:8642:42::3                                       2.091ms 
 2:  gw.friends.steffann.nl                                2.773ms 
 3:  2a00:1ca8:1::194                                     20.296ms 
 4:  2a03:3f40::10:41                                      3.202ms 
 5:  2001:978:2:40::3:1                                    4.871ms 
 6:  no reply
 7:  be3343.ccr41.fra05.atlas.cogentco.com                11.841ms 
 8:  no reply
 9:  be9456.ccr82.vie01.atlas.cogentco.com                38.140ms 
10:  be3935.agr61.vie01.atlas.cogentco.com                23.447ms 
11:  be9461.rcr62.lju01.atlas.cogentco.com                28.455ms 
12:  te0-0-2-0.nr11.b020832-1.lju01.atlas.cogentco.com    29.263ms 
13:  2001:978:2:39::6                                     28.015ms 
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)   open

filter likely at: (none) · 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]                        0.032ms pmtu 1500
 1:  karsolink-01.net.karsolink.com                        0.872ms 
 2:  2a12:d8c0:109f:121::a1                                0.822ms 
 3:  2a12:d8c0:101f:6::1                                  11.077ms 
 4:  2a03:b020:1:51::a                                    11.142ms 
 5:  2a03:b020::246                                       11.001ms asymm  6 
 6:  2001:978:2:2a::e7:1                                  18.490ms asymm  7 
 7:  be4823.agr61.mil02.atlas.cogentco.com                11.665ms asymm  8 
 8:  port-channel3336.ccr92.mil02.atlas.cogentco.com      10.894ms asymm  9 
 9:  no reply
10:  be9456.ccr82.vie01.atlas.cogentco.com                27.167ms asymm 11 
11:  be4079.agr61.vie01.atlas.cogentco.com                25.596ms asymm 12 
12:  be3189.rcr61.lju01.atlas.cogentco.com                31.678ms asymm 13 
13:  te0-0-2-0.nr11.b020832-1.lju01.atlas.cogentco.com    32.417ms asymm 14 
14:  2001:978:2:39::6                                     31.441ms asymm 15 
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)   openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

Path (traceroute + mtr + PTR)

tracepath -6

 1?: [LOCALHOST]                        0.036ms pmtu 1500
 1:  fw1-lju.6connect.com                                  0.667ms 
 1:  fw1-lju.6connect.com                                  0.840ms 
 2:  no reply
 3:  2a00:ee1:800:9::1                                     2.487ms 
 4:  2a00:ee0:1:10::2                                      1.272ms asymm  3 
 5:  2001:1900:5:2:2:0:11c:d49                             8.628ms asymm  7 
 6:  no reply
 7:  2001:978:2:39::6                                     17.832ms asymm 10 
 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