AS44567 - ASCOMPU Technology Transfer Intercontinental S.R.LPARFC 4890 ✓RPKI ✓ 1/1ASPA -

AS overview

Test target: 2a01:9c00:0:1::53 · ns.egontek.net · address space: PA · prefixes announced: 1

prefix(es): 2a01:9c00::/32

Random-IP probe (yarrp) into the AS' prefixes

At least one router inside AS44567's announced prefix replied during the random-target probe. Hop(s): 2a01:9c00::81, 2a01:9c00::91, 2a01:9c00::a1. 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 2026-09-23T12:02:02Z

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]                        0.012ms pmtu 1500
 1:  _gateway                                              0.409ms 
 1:  _gateway                                              0.329ms 
 2:  sox-pn.sox.rs                                         0.586ms 
 3:  e0-33.core2.beg1.he.net                               1.215ms 
 4:  e0-34.core2.bts1.he.net                               8.408ms 
 5:  no reply
 6:  no reply
 7:  r-he-as6939.ipv6.core.egontek.net                    19.676ms 
 8:  r-cdlan-as20836.ipv6.core.egontek.net                26.565ms asymm  6 
 9:  no reply
10:  no reply
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500 

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]                        0.028ms pmtu 1500
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.413ms 
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.488ms 
 2:  ae0-2453.cr10.ber01.lwlcom.net                        0.845ms 
 3:  hurricane-electric.bcix.de                           17.764ms asymm  6 
 4:  no reply
 5:  be47.core1.prg1.he.net                               16.565ms asymm  6 
 6:  be8.core4.fra1.he.net                                17.094ms asymm  5 
 7:  be10.core1.zrh2.he.net                               20.398ms asymm  6 
 8:  be1.core1.mil2.he.net                                24.551ms asymm  7 
 9:  no reply
10:  r-he-as6939.ipv6.core.egontek.net                    22.890ms asymm  9 
11:  r-cdlan-as20836.ipv6.core.egontek.net                22.096ms asymm 12 
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500 

From DE host (Düsseldorf)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

Rate-limited ICMPv6: hop 3, hop 7 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.017ms pmtu 1500
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.319ms 
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.274ms 
 2:  ipv6.decix-dusseldorf.core1.dus1.he.net               6.070ms asymm  3 
 3:  100ge0-0-0-18.core4.fra1.he.net                       6.807ms asymm  4 
 4:  be10.core1.zrh2.he.net                               13.447ms asymm  5 
 5:  be1.core1.mil2.he.net                                16.024ms asymm  6 
 6:  no reply
 7:  r-he-as6939.ipv6.core.egontek.net                    13.900ms asymm  8 
 8:  r-cdlan-as20836.ipv6.core.egontek.net                16.584ms asymm 11 
 9:  no reply
10:  no reply
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500 

From NL host (go6lab)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

tracepath -6

 1?: [LOCALHOST]                        0.084ms pmtu 1500
 1:  2a00:8642:42::2                                     279.357ms 
 1:  2a00:8642:42::2                                       1.069ms 
 2:  no reply
 3:  speed-ix.he.net                                       7.748ms 
 4:  be2.core4.fra1.he.net                                14.017ms 
 5:  be10.core1.zrh2.he.net                               18.345ms 
 6:  be1.core1.mil2.he.net                                21.889ms 
 7:  no reply
 8:  r-he-as6939.ipv6.core.egontek.net                    20.536ms 
 9:  r-as44567-ibgp-frodo.ipv6.core.egontek.net           18.947ms 
10:  no reply
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500 

From ITA host (Karsolink)   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]                        0.027ms pmtu 1500
 1:  karsolink-01.net.karsolink.com                        0.551ms 
 1:  karsolink-01.net.karsolink.com                        0.509ms 
 2:  2a12:d8c0:109f:121::a1                                0.575ms 
 3:  no reply
 4:  no reply
 5:  r-he-as6939.ipv6.core.egontek.net                     9.592ms 
 6:  r-cdlan-as20836.ipv6.core.egontek.net                 9.792ms asymm  5 
 7:  no reply
 8:  no reply
 9:  no reply
10:  no reply
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500 

From SLO host (6connect)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

tracepath -6

 1?: [LOCALHOST]                        0.024ms pmtu 9000
 1:  fw1-lju.6connect.com                                  0.848ms 
 1:  fw1-lju.6connect.com                                  0.579ms 
 2:  ccr-to-fw-ccr1-gw-lju.6connect.com                    1.136ms 
 3:  2a03:a100:0:201:1::1                                  1.047ms 
 4:  2a03:a100:0:201:1::1                                  0.925ms pmtu 1500
 4:  e0-1.core1.lju1.he.net                                2.200ms 
 5:  no reply
 6:  port-channel1.core1.zag2.he.net                       4.217ms 
 7:  no reply
 8:  r-he-as6939.ipv6.core.egontek.net                    12.822ms 
 9:  r-as44567-ibgp-frodo.ipv6.core.egontek.net           12.267ms 
10:  no reply
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
     Too many hops: pmtu 1500

From SLO host (T-2)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

tracepath -6

 1?: [LOCALHOST]                        0.033ms pmtu 1500
 1:  2a01:261:313:b814::1                                  0.778ms 
 1:  2a01:261:313:b814::1                                  0.771ms 
 2:  2a01:260:1::225                                       7.643ms 
 3:  2a01-260-1-1--9a.core6.t-2.net                        2.695ms 
 4:  2a01-260-1-1--38.core6.t-2.net                        4.778ms asymm  3 
 5:  port-channel1.core1.zag2.he.net                      10.840ms asymm  7 
 6:  port-channel1.core1.zag2.he.net                      10.602ms asymm  7 
 7:  r-he-as6939.ipv6.core.egontek.net                    17.646ms 
 8:  r-he-as6939.ipv6.core.egontek.net                    16.270ms asymm  7 
 9:  r-as44567-ibgp-frodo.ipv6.core.egontek.net           17.536ms asymm  8 
10:  no reply
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500