AS201612 - NICAT-MINICAST-AS nic.atPIRFC 4890 ✓RPKI ✓ 2/2ASPA -

AS overview

Test target: 2001:67c:10e0::2 · static prefix probe · address space: PI · prefixes announced: 2

prefix(es): 2001:67c:10e0::/48, 2001:678:24::/48

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

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

We probed 70 arbitrary IPv6 address(es) inside AS201612's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2a01:190:1703:3a::2 at hop 11 - that router answers ICMPv6 Echo. This is not in AS201612'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

Vantage points disagree about Type 2 acceptance - transit ASes on one path may be filtering Type 2 even though the destination's stack accepts it on another path:

• SRB host (SOX, Belgrade): Type 2 honored. Forged PTB accepted; next response shrunk. (ICMPv6 Echo + forged PTB)
• DE host (Berlin): Type 2 honored. Forged PTB accepted; next response shrunk. (ICMPv6 Echo + forged PTB)
• DE host (Düsseldorf): inconclusive: no Echo Reply after PTB (probe 1500B). (ICMPv6 Echo + forged PTB)
• NL host (go6lab): Type 2 honored. Forged PTB accepted; next response shrunk. (ICMPv6 Echo + forged PTB)
• ITA host (Karsolink): Type 2 honored. Forged PTB accepted; next response shrunk. (ICMPv6 Echo + forged PTB)
• SLO host (6connect): Type 2 honored. Forged PTB accepted; next response shrunk. (ICMPv6 Echo + forged PTB)
• SLO host (T-2): Type 2 honored. Forged PTB accepted; next response shrunk. (ICMPv6 Echo + forged PTB)

Why they disagree - measurement artifact: One vantage's probe didn't generate enough data to detect segment shrinkage (natural reply too small, or no second response). The other vantage's verdict is the meaningful one.

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)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

tracepath -6

 1?: [LOCALHOST]                        0.015ms pmtu 1500
 1:  _gateway                                              0.551ms 
 1:  _gateway                                              0.498ms 
 2:  sox-pn.sox.rs                                         0.486ms 
 3:  2001:7f8:1e:8::3d                                     0.731ms asymm  2 
 4:  ae8-930.RT.IRX.VIE.AT.retn.net                       11.775ms asymm  3 
 5:  2a02:2d8:0:a014:232a::1                              11.302ms asymm  6 
 6:  2a00:11c0:47:1:47::252                               11.933ms 
 7:  2a00:11c0:47:1:47::128                               11.892ms asymm  4 
 8:  2a00:11c0:47:1:47::144                               24.617ms 
 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]                        0.020ms pmtu 1500
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.523ms 
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.410ms 
 2:  ae0-2453.cr10.ber01.lwlcom.net                        1.057ms 
 3:  ae0-40.cr10.muc02.lwlcom.net                         11.778ms 
 4:  ae0-10.cr10.muc01.lwlcom.net                         11.576ms 
 5:  wien1.aco.net                                        17.425ms 
 6:  2001:628:1101:1007::1                                17.689ms 
 7:  2001:628:1101:1007::2                                18.285ms 
 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 DE host (Düsseldorf)   open

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

Path (traceroute + mtr + PTR)

tracepath -6

 1?: [LOCALHOST]                        0.023ms pmtu 1500
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  2.629ms 
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.294ms 
 2:  eth1-0-12-h5594.edge5-dus1.bb.wiit.network            1.318ms 
 3:  no reply
 4:  lag11.core3-dus1.bb.wiit.network                      0.427ms 
 5:  lag8.core1-dus-ix.bb.wiit.network                     0.604ms 
 6:  ae3-1337.bbr02.anx25.fra.de.anexia-it.net             4.496ms 
 7:  2a00:11c0:47:1:47::143                               11.108ms 
 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 NL host (go6lab)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

tracepath -6

 1?: [LOCALHOST]                        0.035ms pmtu 1500
 1:  2a00:8642:42::2                                       3.304ms 
 1:  2a00:8642:42::2                                       2.483ms 
 2:  no reply
 3:  2a00:1ca8:1::194                                      3.267ms 
 4:  2a03:3f40::10:33                                      9.961ms 
 5:  amsix.as36236.net                                     7.549ms asymm  3 
 6:  no reply
 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 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]                        0.031ms pmtu 1500
 1:  no reply
 2:  no reply
 3:  2a12:d8c0:101f:6::1                                  10.239ms 
 4:  no reply
 5:  be47.core1.mil2.he.net                               11.325ms 
 6:  be1.core1.zrh2.he.net                                34.993ms 
 7:  no reply
 8:  be1.core3.zrh3.he.net                                15.153ms 
 9:  no reply
10:  no reply
11:  2a01:190:1703:3a::2                                  18.211ms asymm  6 
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]                        0.022ms pmtu 9000
 1:  fw1-lju.6connect.com                                  0.640ms 
 1:  fw1-lju.6connect.com                                  0.533ms 
 2:  no reply
 3:  no reply
 4:  2a00:ee0:1:15::2                                      1.793ms asymm  3 
 5:  2a00:ee0:1:10::2                                      1.754ms pmtu 1500
 5:  no reply
 6:  2a00:11c0:47:1:47::149                               12.477ms asymm  7 
 7:  2a00:11c0:47:1:47::143                               15.748ms asymm 10 
 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

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]                        0.029ms pmtu 1500
 1:  no reply
 2:  2a01:260:1::225                                      10.534ms 
 3:  2a01-260-1-1--9c.core6.t-2.net                        2.623ms 
 4:  2a01-260-1-1--38.core6.t-2.net                        3.536ms asymm  3 
 5:  no reply
 6:  no reply
 7:  vix-ip6-et-0-1-2-0-r60.esh.vie.at.nextlayer.net       9.977ms asymm  5 
 8:  2a01:190:1703:3a::2                                  10.585ms asymm  5 
 9:  2a01:190:1703:3a::2                                  10.807ms asymm  5 
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