AS200424 - CODEMA Alessandro Coratelli trading as CODEMAPARFC 4890 ✓RPKI ✓ 3/3ASPA -

AS overview

Test target: 2a06:42c0::1 · static prefix probe · address space: PA · prefixes announced: 3

prefix(es): 2a06:42c0::/29, 2a0e:1ec0::/29, 2a0f:79c0::/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 AS200424's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2001:b00:1:1:1::1c3 at hop 17 - that router does not answer ICMPv6 Echo. This is not in AS200424'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 2026-09-23T12:04:51Z

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 4, hop 6, hop 8 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.011ms pmtu 1500
 1:  _gateway                                              0.518ms 
 1:  _gateway                                              6.639ms 
 2:  sox-pn.sox.rs                                         0.339ms 
 3:  2001:7f8:1e:8::3d                                     0.661ms asymm  2 
 4:  ae8-930.RT.IRX.VIE.AT.retn.net                       12.857ms asymm  3 
 5:  RT.MIX.MIL.IT.retn.net                               24.240ms asymm  4 
 6:  fastweb-v6.mix-it.net                                29.783ms asymm  5 
 7:  2001:b00:1:1:3::137                                  29.393ms asymm  6 
 8:  no reply
 9:  2a06:42c0::1                                         22.361ms 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 15 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.022ms pmtu 1500
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.483ms 
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.376ms 
 2:  ae0-2453.cr10.ber01.lwlcom.net                        0.658ms 
 3:  ae0-10.cr10.ber03.lwlcom.net                          0.953ms 
 4:  ae0-15.cr11.dtm01.lwlcom.net                          8.528ms asymm  5 
 5:  ae0-10.cr10.dtm02.lwlcom.net                          8.764ms asymm  6 
 6:  ae0-20.cr10.dus04.lwlcom.net                          8.792ms asymm  5 
 7:  ae0-10.cr10.dus01.lwlcom.net                          8.800ms asymm  4 
 8:  ae0-90.cr11.dus01.lwlcom.net                          8.675ms asymm  5 
 9:  as3303.dusseldorf.megaport.com                       17.365ms asymm 13 
10:  i00ffm-005-loo179.bb.ip-plus.net                     17.551ms asymm 12 
11:  i62bsw-015-loo179.ip6.ip-plus.net                    17.498ms asymm 14 
12:  i73olt-005-loo179.bb.ip-plus.net                     17.589ms 
13:  i71lzf-015-loo179.bb.ip-plus.net                     18.283ms asymm 12 
14:  i63bel-005-loo179.bb.ip-plus.net                     20.063ms asymm 13 
15:  as3303-as12874-bel-001-ser0.ce.ip-plus.net           22.496ms asymm  9 
16:  2001:b00:1:1:1::1a7                                  22.829ms asymm  8 
17:  2001:b00:1:1:1::1c3                                  23.628ms asymm  9 
18:  2a06:42c0::1                                         20.832ms 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)

tracepath -6

 1?: [LOCALHOST]                        0.014ms pmtu 1500
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.295ms 
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.278ms 
 2:  eth1-0-12-h5594.edge5-dus1.bb.wiit.network            1.034ms 
 3:  no reply
 4:  lag30.core3-dus1.bb.wiit.network                      0.382ms 
 5:  lag0-vl1011.core1-fra-ix.bb.wiit.network              4.575ms 
 6:  lag0-vl1001.core1-nbg-ncd.bb.wiit.network             7.066ms 
 7:  lag0-vl6.core2-nbg-ncd.bb.wiit.network                7.284ms 
 8:  lag0-vl1006.core2-muc2.bb.wiit.network                9.734ms 
 9:  lag0-vl1009.core1-muc-eq3.bb.wiit.network             9.880ms 
10:  lag0-vl1001.core1-pda-vsix.bb.wiit.network           30.172ms 
11:  lag0-vl1001.core1-mil-mix.bb.wiit.network            20.428ms asymm  9 
12:  lag0-vl5.core3-mil-irid.bb.wiit.network              20.707ms asymm  8 
13:  2a06:42c0::1                                         20.310ms reached
     Resume: pmtu 1500 hops 13 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 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.036ms pmtu 1500
 1:  2a00:8642:42::2                                       2.104ms 
 1:  2a00:8642:42::2                                       1.872ms 
 2:  gw.friends.steffann.nl                                4.457ms 
 3:  2a00:1ca8:1::194                                      2.925ms 
 4:  2a03:3f40::10:33                                      4.602ms 
 5:  no reply
 6:  2001:b00:1:1:3::139                                  23.022ms 
 7:  2001:b00:1:1:1::1c5                                  26.919ms 
 8:  2a06:42c0::1                                         23.255ms 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 4, hop 6 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.029ms pmtu 1500
 1:  no reply
 2:  2a12:d8c0:109f:121::a1                                0.858ms 
 3:  2a12:d8c0:101f:6::1                                  10.237ms 
 4:  fastweb.minap.it                                     11.582ms 
 5:  2001:b00:1:1:3::137                                   9.434ms 
 6:  2001:b00:1:1:1::1c5                                  10.051ms 
 7:  2a06:42c0::1                                         10.568ms reached
     Resume: pmtu 1500 hops 7 back 4 

From SLO host (6connect)   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]                        0.017ms pmtu 9000
 1:  fw1-lju.6connect.com                                  0.504ms 
 1:  fw1-lju.6connect.com                                  0.463ms 
 2:  ccr-to-fw-ccr1-gw-lju.6connect.com                    0.911ms 
 3:  2a03:a100:0:201:1::1                                  1.014ms 
 4:  2a03:a100:0:201:1::1                                  1.123ms pmtu 1500
 4:  2001:7f8:46:0:1::3303                                 8.383ms asymm  5 
 5:  i00mil-005-loo179.bb.ip-plus.net                      8.017ms asymm  6 
 6:  no reply
 7:  2001:b00:1:1:3::139                                  10.365ms asymm  9 
 8:  2001:b00:1:1:1::1c5                                  10.599ms asymm 10 
 9:  2a06:42c0::1                                         10.413ms reached
     Resume: pmtu 1500 hops 9 back 8 

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

tracepath -6

 1?: [LOCALHOST]                        0.029ms pmtu 1500
 1:  no reply
 2:  2a01:260:1::225                                       7.451ms 
 3:  2a01-260-1-1--9a.core6.t-2.net                        3.295ms 
 4:  2001:7f8:46:0:1::3303                                10.384ms 
 5:  i00mil-005-loo179.bb.ip-plus.net                      9.540ms 
 6:  no reply
 7:  2001:b00:1:1:1::1ab                                  14.916ms asymm  8 
 8:  2001:b00:1:1:1::1c5                                  15.937ms asymm  9 
 9:  2a06:42c0::1                                         15.125ms reached
     Resume: pmtu 1500 hops 9 back 7