AS44084 - MULTIWIRE-AS Multiwire S.r.lPARFC 4890 ✓RPKI ✓ 2/2ASPA -

AS overview

Test target: 2a09:6240::1 · static prefix probe · address space: PA · prefixes announced: 2

prefix(es): 2a09:5dc0::/30, 2a09:6240::/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

At least one router inside AS44084's announced prefix replied during the random-target probe. Hop(s): 2a09:6240:0:7::1. These are candidate targets for direct testing.

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 2026-09-23T12:05:59Z

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)

tracepath -6

 1?: [LOCALHOST]                        0.011ms pmtu 1500
 1:  _gateway                                              0.707ms 
 1:  _gateway                                              0.262ms 
 2:  sox-pn.sox.rs                                         0.377ms 
 3:  2001:7f8:1e:8::3d                                     0.557ms asymm  2 
 4:  ae8-930.RT.IRX.VIE.AT.retn.net                       12.934ms asymm  3 
 5:  RT.TC2.AMS.NL.retn.net                               28.989ms 
 6:  ams-ix.ipv6.itgate.net                               30.389ms 
 7:  be12.Woogie.core.MIL2.ipv6.ITgate.net                39.272ms asymm  5 
 8:  multiwire-MIL-gw6.customer.itgate.net                39.025ms asymm  5 
 9:  2a09:6240::1                                         46.039ms reached
     Resume: pmtu 1500 hops 9 back 6 

From DE host (Berlin)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

tracepath -6

 1?: [LOCALHOST]                        0.046ms pmtu 1500
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                 35.869ms 
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.573ms 
 2:  ae0-2453.cr10.ber01.lwlcom.net                        1.011ms 
 3:  ae0-150.cr10.fra01.lwlcom.net                        10.554ms asymm  7 
 4:  ae0-100.cr10.fra02.lwlcom.net                        10.708ms asymm  8 
 5:  ae0-10.cr10.fra06.lwlcom.net                         10.149ms asymm  7 
 6:  ams-ix.1-ix.net                                      19.422ms asymm  8 
 7:  ams-ix.ipv6.itgate.net                               22.502ms asymm  6 
 8:  be12.Woogie.core.MIL2.ipv6.ITgate.net                25.641ms 
 9:  multiwire-MIL-gw6.customer.itgate.net                25.469ms asymm 11 
10:  2a09:6240::1                                         32.821ms reached
     Resume: pmtu 1500 hops 10 back 12 

From DE host (Düsseldorf)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

tracepath -6

 1?: [LOCALHOST]                        0.015ms pmtu 1500
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.421ms 
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.445ms 
 2:  eth1-0-12-h5594.edge5-dus1.bb.wiit.network            1.240ms 
 3:  no reply
 4:  lag30.core3-dus1.bb.wiit.network                      0.337ms 
 5:  lag0-vl1011.core1-fra-ix.bb.wiit.network              4.452ms 
 6:  lag0-vl1001.core1-nbg-ncd.bb.wiit.network             7.318ms 
 7:  lag0-vl6.core2-nbg-ncd.bb.wiit.network                7.169ms 
 8:  lag0-vl1006.core2-muc2.bb.wiit.network                9.720ms 
 9:  lag0-vl1009.core1-muc-eq3.bb.wiit.network             9.879ms 
10:  lag0-vl1001.core1-pda-vsix.bb.wiit.network           20.472ms 
11:  lag0-vl1001.core1-mil-mix.bb.wiit.network            20.383ms asymm  9 
12:  multiwire-AS44084.mix-it.net                         20.512ms asymm 10 
13:  2a09:6240::1                                         27.952ms reached
     Resume: pmtu 1500 hops 13 back 11 

From NL host (go6lab)   openRFC 4890 ✓

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]                        0.035ms pmtu 1500
 1:  2a00:8642:42::2                                       1.977ms 
 1:  2a00:8642:42::2                                       4.378ms 
 2:  gw.friends.steffann.nl                                3.726ms 
 3:  ccr2-ccr1.dc1.nogalliance.org                         2.521ms asymm  2 
 4:  ams-ix.ipv6.itgate.net                                7.037ms asymm  3 
 5:  be12.Woogie.core.MIL2.ipv6.ITgate.net                24.591ms asymm  4 
 6:  multiwire-MIL-gw6.customer.itgate.net                22.413ms asymm  5 
 7:  2a09:6240::1                                         29.043ms reached
     Resume: pmtu 1500 hops 7 back 6 

From ITA host (Karsolink)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

tracepath -6

 1?: [LOCALHOST]                        0.049ms pmtu 1500
 1:  karsolink-01.net.karsolink.com                        0.919ms 
 1:  karsolink-01.net.karsolink.com                        0.813ms 
 2:  2a12:d8c0:109f:121::a1                                0.679ms 
 3:  no reply
 4:  multiwire-AS44084.mix-it.net                          9.202ms 
 5:  2a09:6240::1                                         16.583ms reached
     Resume: pmtu 1500 hops 5 back 5 

From SLO host (6connect)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

tracepath -6

 1?: [LOCALHOST]                        0.019ms pmtu 9000
 1:  fw1-lju.6connect.com                                  0.500ms 
 1:  fw1-lju.6connect.com                                  0.691ms 
 2:  no reply
 3:  2a03:a100:0:201:1::1                                  1.067ms 
 4:  2a03:a100:0:201:1::1                                  1.045ms pmtu 1500
 4:  e0-1.core1.lju1.he.net                                2.126ms 
 5:  no reply
 6:  port-channel1.core1.zag2.he.net                       4.559ms 
 7:  no reply
 8:  multiwire-AS44084.mix-it.net                         10.442ms asymm  6 
 9:  2a09:6240::1                                         17.800ms reached
     Resume: pmtu 1500 hops 9 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 5, hop 6 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.028ms pmtu 1500
 1:  2a01:261:313:b814::1                                  0.801ms 
 1:  2a01:261:313:b814::1                                  0.928ms 
 2:  2a01:260:1::225                                       2.984ms 
 3:  2a01-260-1-1--9a.core6.t-2.net                        2.341ms 
 4:  hurricane-electric.nikhef.nlsix.net                  35.280ms 
 5:  hurricane-electric.nikhef.nlsix.net                  41.046ms asymm  4 
 6:  be3.core4.fra1.he.net                                45.327ms asymm  7 
 7:  be10.core1.zrh2.he.net                               56.415ms asymm  8 
 8:  be1.core1.mil2.he.net                                35.650ms asymm  7 
 9:  be1.core1.mil2.he.net                                39.036ms asymm  7 
10:  multiwire-AS44084.mix-it.net                         34.853ms asymm  7 
11:  2a09:6240::1                                         48.733ms reached
     Resume: pmtu 1500 hops 11 back 8