AS201522 - UB330.netPARFC 4890 ✓RPKI ✓ 1/1ASPA -

AS overview

Test target: 2a05:33c0:0:1::11 · via IPv6 Hitlist (responsive) · address space: PA · prefixes announced: 1

prefix(es): 2a05:33c0::/48

SIX peering

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

We probed 35 arbitrary IPv6 address(es) inside AS201522's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2a01:260:4057::12 at hop 20 - that router answers ICMPv6 Echo. This is not in AS201522'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

Type 2 honored. Forged ICMPv6 PTB (MTU=1280) was accepted by the destination's stack: the next 1500-byte Echo Reply arrived split into 2 fragments via the IPv6 Fragment Header.
method: ICMPv6 Echo + forged PTB, tested 2026-09-23T10:35:48Z

Multi-vantage path map

Every hop of all vantages’ traceroutes toward the target, drawn left→right, grouped into per-AS bubbles (a hop seen from several vantages is one shared bubble, so converging paths merge). It answers two questions per vantage — shown on each source bubble as echo ✓/⚠/✗ · trace ✓/✗: did the destination reply to ICMPv6 Echo (✓ honored, ⚠ replied but PTB not honored, ✗ no reply), and did the traceroute reach it. A line to the target is drawn only when that vantage got an echo reply — solid if the PTB was honored, dashed if not (reachable but a broken-PMTUD / RFC 4890 violation). The path depth still shows how far the traceroute itself got, and runs of unanswered (* *) hops collapse into one dashed “silent” bubble. Open full size ↗

• ● SRB host (SOX, Belgrade)
• ● DE host (Berlin)
• ● DE host (Düsseldorf)
• ● NL host (go6lab)
• ● ITA host (Karsolink)
• ● SLO host (6connect)
• ● SLO host (T-2)
• ── solid line = echo reply, PTB honored (clean reach)
• — — dashed line = echo reply but PTB not honored (RFC 4890 violation)
• no line = no echo reply (never reached)
• ◉ target: green = clean, amber = reachable-but-violation / unreachable
• ⚠ suspected drop AS
• ⋯ silent (unanswered) hops
• ● IXP hop

From SRB host (SOX, Belgrade)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

Rate-limited ICMPv6: hop 9, hop 10 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.019ms pmtu 1500
 1:  _gateway                                              0.523ms 
 1:  _gateway                                              0.697ms 
 2:  sox-pn.sox.rs                                         0.544ms 
 3:  2001:7f8:1e:8::3d                                     0.637ms asymm  2 
 4:  ae8-930.RT.IRX.VIE.AT.retn.net                       13.028ms asymm  3 
 5:  2001:7f8:30:0:2:1:3:4779                             17.691ms asymm  8 
 6:  2a01-260-1-1--d.core6.t-2.net                        18.257ms asymm  7 
 7:  2a01-260-1-1--93.core6.t-2.net                       18.288ms asymm  9 
 8:  2a01-260-4057--12.link6.t-2.net                      19.623ms asymm 10 
 9:  2a05:33c0::3                                         19.864ms asymm 10 
10:  delphi.powercom.si                                   20.092ms reached
     Resume: pmtu 1500 hops 10 back 12 

From DE host (Berlin)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

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

tracepath -6

 1?: [LOCALHOST]                        0.019ms pmtu 1500
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.382ms 
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.395ms 
 2:  ae0-2453.cr10.ber01.lwlcom.net                        0.947ms 
 3:  ae3-90.cr10.ham01.lwlcom.net                          5.206ms 
 4:  ae0-50.cr11.ham01.lwlcom.net                          5.132ms 
 5:  2a00:c380:f000::4b                                    5.623ms asymm  4 
 6:  ae4-2087.dus10.core-backbone.com                     11.490ms asymm  5 
 7:  ae21-2071.fra10.core-backbone.com                    11.045ms asymm  5 
 8:  ae2-2021.fra20.core-backbone.com                     11.075ms asymm  4 
 9:  ae6-2003.nbg20.core-backbone.com                     12.492ms asymm  6 
10:  ae2-2032.muc20.core-backbone.com                     14.894ms asymm  7 
11:  ae1-2028.vie10.core-backbone.com                     20.565ms asymm  8 
12:  2a01:4a0:1338:115::2                                 32.513ms 
13:  2a01-260-1-1--d.core6.t-2.net                        32.034ms asymm 11 
14:  2a01-260-1-1--93.core6.t-2.net                       32.148ms asymm 12 
15:  2a01-260-4057--12.link6.t-2.net                      33.401ms asymm 13 
16:  2a05:33c0::3                                         34.933ms asymm 15 
17:  delphi.powercom.si                                   34.879ms reached
     Resume: pmtu 1500 hops 17 back 16 

From DE host (Düsseldorf)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

tracepath -6

 1?: [LOCALHOST]                        0.012ms pmtu 1500
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.369ms 
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.321ms 
 2:  ipv6.decix-dusseldorf.core1.dus1.he.net               7.075ms asymm  3 
 3:  no reply
 4:  be6.core2.ams2.he.net                                10.250ms asymm  6 
 5:  t-2.interxionfra11.nlsix.net                         34.016ms asymm 11 
 6:  2a01-260-1-1--95.core6.t-2.net                       31.083ms asymm 12 
 7:  2a01-260-4057--12.link6.t-2.net                      31.020ms asymm 12 
 8:  2a05:33c0::3                                         32.642ms asymm 14 
 9:  delphi.powercom.si                                   32.601ms reached
     Resume: pmtu 1500 hops 9 back 14 

From NL host (go6lab)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

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

tracepath -6

 1?: [LOCALHOST]                        0.051ms pmtu 1500
 1:  ???                                                   7.625ms 
 1:  ???                                                   3.240ms 
 2:  gw.friends.steffann.nl                                7.966ms 
 3:  2a00:1ca8:1::194                                      7.812ms 
 4:  2a03:3f40::10:33                                      5.493ms 
 5:  t-2.interxionfra11.nlsix.net                         37.944ms asymm  6 
 6:  2a01-260-1-1--95.core6.t-2.net                       44.493ms asymm  7 
 7:  2a01-260-4057--12.link6.t-2.net                      41.438ms asymm  8 
 8:  2a05:33c0::3                                         44.280ms asymm  9 
 9:  delphi.powercom.si                                   41.203ms reached
     Resume: pmtu 1500 hops 9 back 11 

From ITA host (Karsolink)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

Rate-limited ICMPv6: hop 5, hop 11 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.033ms pmtu 1500
 1:  no reply
 2:  no reply
 3:  2a12:d8c0:101f:6::1                                   9.837ms 
 4:  no reply
 5:  100ge0-0-0-20.core1.vie1.he.net                      22.684ms 
 6:  2001:7f8:30:0:2:1:3:4779                             19.643ms 
 7:  2a01-260-1-1--d.core6.t-2.net                        45.449ms asymm 11 
 8:  2a01-260-1-1--93.core6.t-2.net                       37.683ms asymm 11 
 9:  2a01-260-4057--12.link6.t-2.net                      44.999ms asymm 12 
10:  2a05:33c0::3                                         46.651ms asymm 13 
11:  delphi.powercom.si                                   46.321ms reached
     Resume: pmtu 1500 hops 11 back 14 

From SLO host (6connect)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

Rate-limited ICMPv6: hop 3, hop 7, hop 8 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.021ms pmtu 9000
 1:  fw1-lju.6connect.com                                  0.732ms 
 1:  fw1-lju.6connect.com                                  0.787ms 
 2:  no reply
 3:  2a03:a100:0:201:1::1                                  1.015ms 
 4:  2a03:a100:0:201:1::1                                  0.926ms pmtu 1500
 4:  six.t-2.si                                            1.419ms 
 5:  2a01-260-1-1--93.core6.t-2.net                        1.435ms asymm  6 
 6:  2a01-260-4057--12.link6.t-2.net                       3.658ms 
 7:  2a05:33c0::3                                          4.281ms 
 8:  delphi.powercom.si                                    6.034ms reached
     Resume: pmtu 1500 hops 8 back 8 

From SLO host (T-2)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

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

tracepath -6

 1?: [LOCALHOST]                        0.025ms pmtu 1500
 1:  no reply
 2:  2a01:260:1::225                                       4.735ms 
 3:  2a01-260-1-1--9a.core6.t-2.net                        2.627ms 
 4:  2a01-260-1-1--95.core6.t-2.net                        2.312ms 
 5:  2a01-260-4057--12.link6.t-2.net                       4.356ms 
 6:  2a05:33c0::3                                          7.084ms 
 7:  delphi.powercom.si                                    6.252ms reached
     Resume: pmtu 1500 hops 7 back 7