AS209624 - COMMON_NET COMMON NET S.r.lPARPKI ✓ 1/1ASPA -

AS overview

Test target: 2a09:7c0::8b1c:94fb · ns1.common-net.org · address space: PA · prefixes announced: 1

prefix(es): 2a09:7c0::/29

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

We probed 35 arbitrary IPv6 address(es) inside AS209624's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2001:470:5a5:1::2 at hop 20 - that router answers ICMPv6 Echo. This is not in AS209624'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 active test inconclusive: no Echo Reply to 1300-byte probe.
method: ICMPv6 Echo + forged PTB, tested 2026-09-23T12:06:05Z

sudo tcpdump -i any -n -e 'icmp6 and ip6[40] = 2 and (src host 2607:fae0:a000::42 or src host 2a00:8642:42::75 or src host 2a01:261:313:b814:2a0:98ff:fe5b:13e4 or src host 2a06:d1c1:10b::cccc or src host 2a06:d1c1:10d::aaaa or src host 2a09:ab81::91 or src host 2a12:d8c0:105a:9001::a154)'

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)   all blocked

filter likely at: past AS6939 (HURRICANE) · min PMTU on path: 1500

Path (traceroute + mtr + PTR)

Rate-limited ICMPv6: hop 5, hop 8, hop 9 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.010ms pmtu 1500
 1:  _gateway                                              0.388ms 
 1:  _gateway                                              0.586ms 
 2:  sox-pn.sox.rs                                         0.393ms 
 3:  e0-33.core2.beg1.he.net                               1.128ms 
 4:  e0-34.core2.bts1.he.net                               8.418ms 
 5:  100ge0-0-0-2.core1.vie1.he.net                       10.603ms 
 6:  no reply
 7:  port-channel2.core2.rom1.he.net                      28.561ms 
 8:  2001:470:5a5:1::2                                    27.637ms 
 9:  2001:470:5a5:1::2                                   584.840ms !H
     Resume: pmtu 1500 

From DE host (Berlin)   all blocked

filter likely at: past AS6939 (HURRICANE) · min PMTU on path: 1500

Path (traceroute + mtr + PTR)

Rate-limited ICMPv6: hop 6, hop 12 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.032ms pmtu 1500
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                 40.558ms 
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.462ms 
 2:  ae0-2453.cr10.ber01.lwlcom.net                        0.846ms 
 3:  hurricane-electric.bcix.de                           17.280ms asymm  6 
 4:  no reply
 5:  be47.core1.prg1.he.net                               15.910ms asymm  6 
 6:  be8.core4.fra1.he.net                                15.479ms asymm  5 
 7:  be10.core1.zrh2.he.net                               21.082ms asymm  6 
 8:  be1.core1.mil2.he.net                                23.578ms asymm  7 
 9:  no reply
10:  e0-36.core2.rom1.he.net                              31.589ms asymm  9 
11:  2001:470:5a5:1::2                                    31.128ms asymm 10 
12:  2001:470:5a5:1::2                                   1472.945ms !H
     Resume: pmtu 1500 

From DE host (Düsseldorf)   all blocked

filter likely at: past AS6939 (HURRICANE) · min PMTU on path: 1500

Path (traceroute + mtr + PTR)

Rate-limited ICMPv6: hop 3, hop 9 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.023ms pmtu 1500
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.401ms 
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.433ms 
 2:  ipv6.decix-dusseldorf.core1.dus1.he.net               8.121ms asymm  3 
 3:  100ge0-0-0-18.core4.fra1.he.net                       7.247ms asymm  4 
 4:  be10.core1.zrh2.he.net                               12.416ms asymm  5 
 5:  be1.core1.mil2.he.net                                15.041ms asymm  6 
 6:  no reply
 7:  e0-36.core2.rom1.he.net                              23.019ms asymm  8 
 8:  2001:470:5a5:1::2                                    21.823ms asymm  9 
 9:  2001:470:5a5:1::2                                   695.409ms !H
     Resume: pmtu 1500 

From NL host (go6lab)   all blocked

filter likely at: past AS6939 (HURRICANE) · min PMTU on path: 1500

Path (traceroute + mtr + PTR)

Rate-limited ICMPv6: hop 9, hop 10 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.039ms pmtu 1500
 1:  2a00:8642:42::2                                       3.704ms 
 1:  2a00:8642:42::2                                       3.038ms 
 2:  no reply
 3:  speed-ix.he.net                                       9.130ms 
 4:  be2.core4.fra1.he.net                                13.988ms 
 5:  be10.core1.zrh2.he.net                               19.549ms 
 6:  be1.core1.mil2.he.net                                23.977ms 
 7:  no reply
 8:  e0-36.core2.rom1.he.net                              28.196ms 
 9:  2001:470:5a5:1::2                                    27.110ms 
10:  no reply
10:  2001:470:5a5:1::2                                   3089.329ms !H
     Resume: pmtu 1500 

From ITA host (Karsolink)   all blocked

filter likely at: past AS6939 (HURRICANE) · min PMTU on path: 1500

Path (traceroute + mtr + PTR)

Rate-limited ICMPv6: hop 6, hop 7 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.031ms pmtu 1500
 1:  karsolink-01.net.karsolink.com                        0.621ms 
 2:  no reply
 3:  no reply
 4:  no reply
 5:  e0-36.core2.rom1.he.net                              19.859ms 
 6:  2001:470:5a5:1::2                                    17.241ms 
 7:  no reply
 7:  2001:470:5a5:1::2                                   3088.978ms !H
     Resume: pmtu 1500 

From SLO host (6connect)   all blocked

filter likely at: past AS6939 (HURRICANE) · min PMTU on path: 1500

Path (traceroute + mtr + PTR)

Rate-limited ICMPv6: hop 4, hop 6, hop 9, hop 10 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.020ms pmtu 9000
 1:  fw1-lju.6connect.com                                  0.467ms 
 1:  fw1-lju.6connect.com                                  0.679ms 
 2:  no reply
 3:  2a03:a100:0:201:1::1                                  1.165ms 
 4:  2a03:a100:0:201:1::1                                  1.085ms pmtu 1500
 4:  e0-1.core1.lju1.he.net                                1.952ms 
 5:  no reply
 6:  port-channel1.core1.zag2.he.net                       4.084ms 
 7:  no reply
 8:  e0-36.core2.rom1.he.net                              21.294ms 
 9:  2001:470:5a5:1::2                                    20.414ms 
10:  no reply
10:  2001:470:5a5:1::2                                   3092.841ms !H
     Resume: pmtu 1500 

From SLO host (T-2)   all blocked

filter likely at: past AS6939 (HURRICANE) · min PMTU on path: 1500

Path (traceroute + mtr + PTR)

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

tracepath -6

 1?: [LOCALHOST]                        0.026ms pmtu 1500
 1:  no reply
 2:  2a01:260:1::225                                       2.646ms 
 3:  2a01-260-1-1--9c.core6.t-2.net                        2.712ms 
 4:  2a01-260-1-1--38.core6.t-2.net                        3.459ms asymm  3 
 5:  port-channel1.core1.zag2.he.net                      10.821ms asymm  7 
 6:  port-channel1.core1.zag2.he.net                      11.077ms asymm  7 
 7:  e0-36.core2.rom1.he.net                              26.799ms 
 8:  e0-36.core2.rom1.he.net                              26.152ms asymm  7 
 9:  2001:470:5a5:1::2                                    25.687ms asymm  8 
 9:  2001:470:5a5:1::2                                   2007.823ms !H
     Resume: pmtu 1500