AS207054 - FLYNET-IT FLYNET SRLPI/PARFC 4890 ✓RPKI ✓ 2/2ASPA -

AS overview

Test target: 2a0b:1a00::1 · static prefix probe · address space: mixed · prefixes announced: 2

prefix(es): 2a0b:1a00::/29, 2a0e:2680::/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

We probed 70 arbitrary IPv6 address(es) inside AS207054's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2001:4ba0:ffe9:db::2 at hop 11 - that router answers ICMPv6 Echo. This is not in AS207054's announced prefix; operationally it's the AS-edge / peering interface (often on an IXP 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 2026-09-23T12:06:37Z

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

tracepath -6

 1?: [LOCALHOST]                        0.009ms pmtu 1500
 1:  _gateway                                              0.539ms 
 1:  _gateway                                              0.464ms 
 2:  sox-pn.sox.rs                                         0.348ms 
 3:  e0-33.core2.beg1.he.net                               1.234ms 
 4:  e0-34.core2.bts1.he.net                               8.385ms 
 5:  100ge0-0-0-2.core1.vie1.he.net                       10.184ms 
 6:  no reply
 7:  dbnetwork.topix.it                                   28.759ms asymm  5 
 8:  2a0b:1a00:10:1::                                     28.823ms asymm  6 
 9:  2a0b:1a00::1                                         27.158ms reached
     Resume: pmtu 1500 hops 9 back 7 

From DE host (Berlin)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

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

tracepath -6

 1?: [LOCALHOST]                        0.020ms pmtu 1500
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.412ms 
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.466ms 
 2:  ae0-2453.cr10.ber01.lwlcom.net                        1.147ms 
 3:  hurricane-electric.bcix.de                           17.715ms asymm  6 
 4:  no reply
 5:  be47.core1.prg1.he.net                               16.993ms asymm  6 
 6:  be8.core4.fra1.he.net                                16.932ms asymm  5 
 7:  be10.core1.zrh2.he.net                               21.140ms asymm  6 
 8:  be1.core1.mil2.he.net                                24.815ms asymm  7 
 9:  no reply
10:  flynet-AS207054-v6.mix-it.net                        21.876ms asymm 11 
11:  2a0b:1a00:10:1::                                     26.114ms asymm 13 
12:  2a0b:1a00::1                                         26.946ms reached
     Resume: pmtu 1500 hops 12 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                  0.270ms 
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.288ms 
 2:  eth1-0-12-h5594.edge5-dus1.bb.wiit.network            1.178ms 
 3:  no reply
 4:  lag11.core3-dus1.bb.wiit.network                      0.597ms 
 5:  lag0-vl1011.core1-fra-ix.bb.wiit.network              4.792ms 
 6:  lag0-vl1001.core1-nbg-ncd.bb.wiit.network             7.295ms 
 7:  lag0-vl6.core2-nbg-ncd.bb.wiit.network                7.345ms 
 8:  lag0-vl1006.core2-muc2.bb.wiit.network               10.602ms 
 9:  lag0-vl1009.core1-muc-eq3.bb.wiit.network            10.224ms 
10:  lag0-vl1001.core1-pda-vsix.bb.wiit.network           20.636ms 
11:  lag0-vl1001.core1-mil-mix.bb.wiit.network            20.611ms asymm  9 
12:  flynet-AS207054-v6.mix-it.net                        20.272ms asymm 10 
13:  2a0b:1a00:5:2::1                                     23.611ms asymm 11 
14:  2a0b:1a00:10:1::                                     23.723ms asymm 12 
15:  2a0b:1a00::1                                         24.678ms reached
     Resume: pmtu 1500 hops 15 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, hop 4 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.051ms pmtu 1500
 1:  2a00:8642:42::2                                       2.456ms 
 1:  2a00:8642:42::2                                       3.892ms 
 2:  no reply
 3:  speed-ix.he.net                                      11.728ms 
 4:  be2.core4.fra1.he.net                                12.519ms 
 5:  be10.core1.zrh2.he.net                               17.352ms 
 6:  be1.core1.mil2.he.net                                21.036ms 
 7:  no reply
 8:  2001:7f8:5f:ffff::73                                 22.938ms 
 9:  2a0b:1a00:10:1::                                     22.530ms 
10:  2a0b:1a00::1                                         24.666ms reached
     Resume: pmtu 1500 hops 10 back 10 

From ITA host (Karsolink)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

tracepath -6

 1?: [LOCALHOST]                        0.041ms pmtu 1500
 1:  karsolink-01.net.karsolink.com                        0.941ms 
 1:  karsolink-01.net.karsolink.com                        0.985ms 
 2:  2a12:d8c0:109f:121::a1                                0.714ms 
 3:  no reply
 4:  2001:7f8:b9::31:1                                    12.913ms 
 5:  2a0b:1a00:10:1::                                     13.343ms 
 6:  2a0b:1a00::1                                         14.021ms reached
     Resume: pmtu 1500 hops 6 back 6 

From SLO host (6connect)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

tracepath -6

 1?: [LOCALHOST]                        0.027ms pmtu 9000
 1:  fw1-lju.6connect.com                                  0.830ms 
 1:  fw1-lju.6connect.com                                  0.984ms 
 2:  no reply
 3:  2a03:a100:0:201:1::1                                  1.275ms 
 4:  2a03:a100:0:201:1::1                                  1.321ms pmtu 1500
 4:  e0-1.core1.lju1.he.net                                2.378ms 
 5:  no reply
 6:  port-channel1.core1.zag2.he.net                       5.095ms 
 7:  no reply
 8:  flynet-AS207054-v6.mix-it.net                        12.431ms 
 9:  2a0b:1a00:5:2::1                                     15.907ms asymm  8 
10:  2a0b:1a00::1                                         17.217ms reached
     Resume: pmtu 1500 hops 10 back 10 

From SLO host (T-2)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

tracepath -6

 1?: [LOCALHOST]                        0.026ms pmtu 1500
 1:  no reply
 2:  2a01:260:1::225                                       3.432ms 
 3:  2a01-260-1-1--9a.core6.t-2.net                        3.053ms 
 4:  2a01-260-1-1--38.core6.t-2.net                        2.564ms asymm  3 
 5:  port-channel1.core1.zag2.he.net                      11.322ms asymm  7 
 6:  port-channel1.core1.zag2.he.net                      10.392ms asymm  7 
 7:  dbnetwork.topix.it                                   20.874ms 
 8:  2a0b:1a00:10:1::                                     20.559ms 
 9:  2a0b:1a00:10:1::                                     19.841ms asymm  8 
10:  2a0b:1a00::1                                         22.178ms reached
     Resume: pmtu 1500 hops 10 back 9