AS206701 - FibraCity Power & Telco SRLPARFC 4890 ✓RPKI -ASPA -

AS overview

Test target: 2a14:3040::1 · static prefix probe · address space: PA · prefixes announced: 1

prefix(es): 2a14:3040::/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 AS206701's announced prefix replied during the random-target probe. Hop(s): 2a14:3040::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 2026-09-23T12:09:35Z

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

tracepath -6

 1?: [LOCALHOST]                        0.018ms pmtu 1500
 1:  _gateway                                              0.574ms 
 1:  _gateway                                              0.594ms 
 2:  sox-pn.sox.rs                                         0.534ms 
 3:  2001:7f8:1e:8::3d                                     0.724ms asymm  2 
 4:  ae8-930.RT.IRX.VIE.AT.retn.net                       13.007ms asymm  3 
 5:  RT.MIX.MIL.IT.retn.net                               24.346ms asymm  4 
 6:  fastweb-v6.mix-it.net                                30.961ms asymm  5 
 7:  2001:b00:1:1:3::12d                                  28.784ms asymm  6 
 8:  no reply
 9:  2a14:3040::1                                         37.641ms reached
     Resume: pmtu 1500 hops 9 back 8 

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]                        0.038ms pmtu 1500
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.526ms 
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.312ms 
 2:  ae0-2453.cr10.ber01.lwlcom.net                        1.041ms 
 3:  ae0-10.cr10.ber03.lwlcom.net                         28.905ms 
 4:  ae0-15.cr11.dtm01.lwlcom.net                          8.636ms asymm  5 
 5:  ae0-10.cr10.dtm02.lwlcom.net                          9.685ms asymm  6 
 6:  ae0-50.cr10.dus02.lwlcom.net                          8.708ms asymm  3 
 7:  ae0-20.cr10.dus01.lwlcom.net                          8.914ms asymm  4 
 8:  ae0-90.cr11.dus01.lwlcom.net                          9.054ms asymm  5 
 9:  as3303.dusseldorf.megaport.com                       17.559ms asymm 13 
10:  i00ffm-005-loo179.bb.ip-plus.net                     17.570ms asymm 12 
11:  i62bsw-015-loo179.ip6.ip-plus.net                    17.818ms asymm 14 
12:  i73olt-005-loo179.bb.ip-plus.net                     17.714ms 
13:  i71lzf-015-loo179.bb.ip-plus.net                     18.139ms asymm 12 
14:  i63bel-005-loo179.bb.ip-plus.net                     20.154ms asymm 13 
15:  no reply
16:  2001:b00:1:1:1::1af                                  23.200ms asymm  8 
17:  2001:b00:1:1:3::145                                  23.856ms asymm  9 
18:  2a14:3040::1                                         33.653ms reached
     Resume: pmtu 1500 hops 18 back 10 

From DE host (Düsseldorf)   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]                        0.026ms pmtu 1500
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.296ms 
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.271ms 
 2:  eth1-0-12-h5594.edge5-dus1.bb.wiit.network            1.207ms 
 3:  no reply
 4:  lag11.core3-dus1.bb.wiit.network                      0.442ms 
 5:  lag8.core1-dus-ix.bb.wiit.network                     0.604ms 
 6:  no reply
 7:  2001:b00:1:1:1::1b3                                  17.616ms 
 8:  no reply
 9:  2a14:3040::1                                         29.411ms reached
     Resume: pmtu 1500 hops 9 back 9 

From NL host (go6lab)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

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

tracepath -6

 1?: [LOCALHOST]                        0.038ms pmtu 1500
 1:  2a00:8642:42::2                                       5.330ms 
 1:  2a00:8642:42::2                                       1.600ms 
 2:  gw.friends.steffann.nl                                3.604ms 
 3:  2a00:1ca8:1::194                                      7.020ms 
 4:  2a03:3f40::10:33                                     12.093ms 
 5:  2001:7f8:1::a501:2874:1                              23.152ms 
 6:  2001:b00:1:1:3::131                                  21.881ms 
 7:  2001:b00:1:1:3::145                                  23.947ms 
 8:  2a14:3040::1                                         32.241ms reached
     Resume: pmtu 1500 hops 8 back 8 

From ITA host (Karsolink)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

Rate-limited ICMPv6: hop 3, hop 4, hop 6 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.055ms pmtu 1500
 1:  karsolink-01.net.karsolink.com                        0.954ms 
 1:  karsolink-01.net.karsolink.com                        0.767ms 
 2:  2a12:d8c0:109f:121::a1                                0.800ms 
 3:  no reply
 4:  no reply
 5:  2001:b00:1:1:3::12d                                   9.363ms 
 6:  no reply
 7:  2a14:3040::1                                         18.083ms 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, hop 8, hop 10 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.029ms pmtu 9000
 1:  fw1-lju.6connect.com                                  0.718ms 
 1:  fw1-lju.6connect.com                                  0.621ms 
 2:  no reply
 3:  no reply
 4:  2a00:ee0:1:10::2                                      1.497ms asymm  3 
 5:  2a00:ee0:1:15::2                                      2.013ms pmtu 1500
 5:  2001:1900:5:2:2:0:11c:d49                             6.649ms asymm  7 
 6:  lo0.0.edge1.Milan1.level3.net                        17.351ms asymm  9 
 7:  3741-3356-mln.sp.lumen.tech                          14.478ms asymm  6 
 8:  2001:4d98:a000::119                                  49.284ms asymm 10 
 9:  2001:b00:1:1:3::131                                  16.170ms 
10:  2001:b00:1:1:3::147                                  17.193ms 
11:  2a14:3040::1                                         25.835ms reached
     Resume: pmtu 1500 hops 11 back 11 

From SLO host (T-2)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

Rate-limited ICMPv6: hop 9, hop 11 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.028ms pmtu 1500
 1:  no reply
 2:  2a01:260:1::225                                       3.510ms 
 3:  2a01-260-1-1--9c.core6.t-2.net                        6.253ms 
 4:  2a01-260-1-1--25.core6.t-2.net                       18.142ms 
 5:  2a01-260-1-1--2a.core6.t-2.net                        5.336ms asymm  4 
 6:  2001:7f8:30:0:2:1:0:3303                              8.848ms asymm  5 
 7:  i79zhb-015-loo179.bb.ip-plus.net                     26.847ms asymm  6 
 8:  i71lzf-015-loo179.bb.ip-plus.net                     15.901ms asymm  7 
 9:  i63bel-005-loo179.bb.ip-plus.net                     16.606ms asymm  6 
10:  2001:b00:1:1:1::1af                                  34.393ms asymm  8 
11:  2001:b00:1:1:1::1af                                  22.208ms asymm  8 
12:  2a14:3040::1                                         35.410ms reached
     Resume: pmtu 1500 hops 12 back 10