AS44753 - BACHER-AS Bacher Systems EDVRFC 4890 ✓RPKI ✓ 1/1ASPA -

AS overview

Test target: 2a01:190:15ef::1 · static prefix probe · address space: unknown · prefixes announced: 1

prefix(es): 2a01:190:15ef::/48

VIX / AAIX / SAIX / TIROL-IX / ERA-IX peering

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 2026-09-22T13:52:32Z

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]                        0.014ms pmtu 1500
 1:  _gateway                                              0.517ms 
 1:  _gateway                                              0.619ms 
 2:  sox-pn.sox.rs                                         0.451ms 
 3:  2001:7f8:1e:8::3d                                     0.985ms asymm  2 
 4:  ae8-930.RT.IRX.VIE.AT.retn.net                       11.375ms asymm  3 
 5:  vix-ip6-et-0-1-2-0-r60.inx.vie.at.nextlayer.net      11.350ms asymm  3 
 6:  no reply
 7:  2a01:190:1700:104::2                                 13.653ms reached
     Resume: pmtu 1500 hops 7 back 7 

From DE host (Berlin)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

tracepath -6

 1?: [LOCALHOST]                        0.026ms pmtu 1500
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.581ms 
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.740ms 
 2:  ae0-2453.cr10.ber01.lwlcom.net                        1.122ms 
 3:  ae0-150.cr10.fra01.lwlcom.net                        12.158ms asymm  7 
 4:  ae0-100.cr10.fra02.lwlcom.net                        10.685ms asymm  8 
 5:  ae0-10.cr10.fra06.lwlcom.net                         10.469ms asymm  7 
 6:  nextlayer.peering.cz                                 18.730ms asymm  8 
 7:  no reply
 8:  2a01:190:1700:104::2                                 23.854ms reached
     Resume: pmtu 1500 hops 8 back 13 

From DE host (Düsseldorf)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

tracepath -6

 1?: [LOCALHOST]                        0.024ms pmtu 1500
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.323ms 
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.249ms 
 2:  eth1-0-12-h5594.edge5-dus1.bb.wiit.network            1.143ms 
 3:  no reply
 4:  lag30.core3-dus1.bb.wiit.network                      0.437ms 
 5:  lag2.core1-dus-ix.bb.wiit.network                     0.698ms 
 6:  de-cix.r60.inx.fra.de.nextlayer.net                   3.976ms 
 7:  no reply
 8:  2a01:190:1700:104::2                                 17.342ms reached
     Resume: pmtu 1500 hops 8 back 12 

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]                        0.029ms pmtu 1500
 1:  2a00:8642:42::2                                       2.361ms 
 1:  2a00:8642:42::2                                       3.794ms 
 2:  no reply
 3:  no reply
 4:  ams-ix.r06.nikh.ams.nl.nextlayer.net                 70.047ms asymm  8 
 5:  no reply
 6:  2a01:190:1700:104::2                                 25.089ms reached
     Resume: pmtu 1500 hops 6 back 11 

From ITA host (Karsolink)   echo onlyRFC 4890 ✓

filter likely at: past AS1764 (NEXTLAYER-AS) · 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]                        0.034ms pmtu 1500
 1:  karsolink-01.net.karsolink.com                        1.343ms 
 2:  2a12:d8c0:109f:121::a1                                0.909ms 
 3:  2a12:d8c0:101f:6::1                                  10.343ms 
 4:  no reply
 5:  be47.core1.mil2.he.net                               11.899ms 
 6:  be1.core1.zrh2.he.net                                15.238ms 
 7:  no reply
 8:  be1.core3.zrh3.he.net                                15.293ms 
 9:  no reply
10:  no reply
11:  2a01:190:1700:104::2                                 20.091ms reached
     Resume: pmtu 1500 hops 11 back 11 

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]                        0.019ms pmtu 9000
 1:  fw1-lju.6connect.com                                  0.637ms 
 1:  fw1-lju.6connect.com                                  0.429ms 
 2:  no reply
 3:  no reply
 4:  2a00:ee0:1:15::2                                      1.563ms asymm  3 
 5:  2a00:ee0:1:15::2                                      2.587ms pmtu 1500
 5:  de-cix.r60.inx.fra.de.nextlayer.net                  15.350ms asymm  6 
 6:  no reply
 7:  2a01:190:1700:104::2                                 33.965ms reached
     Resume: pmtu 1500 hops 7 back 9 

From SLO host (T-2)   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]                        0.056ms pmtu 1500
 1:  2a01:261:313:b814::1                                  1.055ms 
 1:  no reply
 2:  2a01:260:1::225                                       2.585ms 
 3:  2a01-260-1-1--9c.core6.t-2.net                        2.591ms 
 4:  2a01-260-1-1--38.core6.t-2.net                        2.552ms asymm  3 
 5:  100ge0-0-0-31.core1.vie1.he.net                      13.121ms 
 6:  vix-ip6-et-0-1-2-0-r60.esh.vie.at.nextlayer.net      10.637ms asymm  5 
 7:  vix-ip6-et-0-1-2-0-r60.inx.vie.at.nextlayer.net       9.932ms asymm  5 
 8:  2a01:190:1700:104::2                                 12.212ms reached
     Resume: pmtu 1500 hops 8 back 9