AS39120 - CONVERGENZE-AS ConvergenzePI/PARFC 4890 ✓RPKI ✓ 4/4ASPA -

AS overview

Test target: 2a01:9a80::1:110 · mail.convergenze.it · address space: mixed · prefixes announced: 4

prefix(es): 2a01:9a80::/32, 2a01:9a82::/32, 2a01:9a81::/32, 2a01:9a83::/32

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 AS39120's announced prefix replied during the random-target probe. Hop(s): 2a01:9a80:0:19::3, 2a01:9a80:0:4::1, 2a01:9a80:0:8::4, 2a01:9a80:0:d::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 2026-09-23T12:01:55Z

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]                        0.021ms pmtu 1500
 1:  _gateway                                              1.161ms 
 1:  _gateway                                              0.487ms 
 2:  2001:7f8:1e::62                                       8.099ms 
 3:  as39120.v6.netix.net                                 38.644ms 
 4:  2a01:9a80:0:d::1                                     53.782ms 
 5:  rs2-roma.convergenze.it                              54.264ms 
 6:  2a01:9a80::1:110                                     50.045ms reached
     Resume: pmtu 1500 hops 6 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]                        0.016ms pmtu 1500
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.486ms 
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.585ms 
 2:  ae0-2453.cr10.ber01.lwlcom.net                        0.834ms 
 3:  ae0-150.cr10.fra01.lwlcom.net                        10.445ms asymm  7 
 4:  ae0-20.cr10.fra07.lwlcom.net                         10.533ms asymm  6 
 5:  ae0-40.cr10.fra04.lwlcom.net                         10.320ms 
 6:  as57463.frankfurt.megaport.com                       10.353ms 
 7:  2a01:9a80:0:d::1                                     38.068ms asymm 12 
 8:  2a01:9a80:0:d::1                                     45.532ms asymm 12 
 9:  rs2-roma.convergenze.it                              44.912ms asymm 13 
10:  2a01:9a80::1:110                                     39.964ms reached
     Resume: pmtu 1500 hops 10 back 14 

From DE host (Düsseldorf)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

tracepath -6

 1?: [LOCALHOST]                        0.025ms pmtu 1500
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.664ms 
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.293ms 
 2:  eth1-0-12-h5594.edge5-dus1.bb.wiit.network           12.974ms 
 3:  no reply
 4:  lag30.core3-dus1.bb.wiit.network                      0.232ms 
 5:  lag2.core1-dus-ix.bb.wiit.network                     0.437ms 
 6:  de-cix.convergenze.it                                22.596ms asymm  3 
 7:  border1.convergenze.it                               35.585ms asymm 11 
 8:  rs2-roma.convergenze.it                              25.806ms asymm 12 
 9:  2a01:9a80::1:110                                     27.254ms reached
     Resume: pmtu 1500 hops 9 back 13 

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]                        0.047ms pmtu 1500
 1:  2a00:8642:42::2                                       2.158ms 
 1:  2a00:8642:42::2                                       2.953ms 
 2:  no reply
 3:  ccr2-ccr1.dc1.nogalliance.org                         4.516ms asymm  2 
 4:  2001:7f8:1::a503:9120:1                              35.577ms asymm  5 
 5:  border1.convergenze.it                               38.634ms 
 6:  rs2-roma.convergenze.it                              37.692ms 
 7:  2a01:9a80::1:110                                     39.035ms reached
     Resume: pmtu 1500 hops 7 back 7 

From ITA host (Karsolink)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

tracepath -6

 1?: [LOCALHOST]                        0.038ms pmtu 1500
 1:  no reply
 2:  2a12:d8c0:109f:121::a1                                0.607ms 
 3:  2a12:d8c0:101f:6::1                                  10.090ms 
 4:  convergenze-v6.mix-it.net                             8.894ms 
 5:  2a01:9a80:0:d::1                                     24.022ms 
 6:  rs2-roma.convergenze.it                              22.611ms 
 7:  2a01:9a80::1:110                                     22.554ms reached
     Resume: pmtu 1500 hops 7 back 7 

From SLO host (6connect)   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]                        0.018ms pmtu 9000
 1:  fw1-lju.6connect.com                                  0.574ms 
 1:  fw1-lju.6connect.com                                  0.615ms 
 2:  no reply
 3:  2a00:ee1:800:9::1                                   146.045ms 
 4:  2a00:ee0:1:15::2                                      1.399ms asymm  3 
 5:  2a00:ee0:1:10::2                                      1.700ms pmtu 1500
 5:  de-cix.convergenze.it                                31.387ms asymm 10 
 6:  border1.convergenze.it                               31.218ms asymm 10 
 7:  rs2-roma.convergenze.it                              30.658ms asymm 11 
 8:  2a01:9a80::1:110                                     31.209ms reached
     Resume: pmtu 1500 hops 8 back 12 

From SLO host (T-2)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

tracepath -6

 1?: [LOCALHOST]                        0.027ms pmtu 1500
 1:  2a01:261:313:b814::1                                  1.625ms 
 1:  no reply
 2:  2a01:260:1::225                                       3.582ms 
 3:  2a01-260-1-1--9a.core6.t-2.net                        2.599ms 
 4:  2001:7f8:46:0:1:0:5:7463                             10.854ms 
 5:  ???                                                  19.993ms 
 6:  2a01:9a80:0:d::1                                     32.923ms 
 7:  rs2-roma.convergenze.it                              33.001ms 
 8:  2a01:9a80::1:110                                     32.135ms reached
     Resume: pmtu 1500 hops 8 back 8