AS8412 - TMA T-Mobile AustriaPI/PARFC 4890 ✓RPKI ✓ 41/41ASPA ✓

AS overview

Test target: 2001:4bc8:2000:702::1 · ns1.nameservice.at · address space: mixed · prefixes announced: 41

prefix(es): 2a02:8389:2000::/36, 2a02:8383::/32, 2a02:8380::/32, 2001:4bc8::/29, 2a02:8388:e000::/36, 2a02:8381::/32, 2a02:8388:5000::/36, 2a02:8388:a000::/36 (+33 more)

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

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

At least one router inside AS8412's announced prefix replied during the random-target probe. Hop(s): 2a02:8383:0:1000::6:0, 2a02:8383:0:1000::b:0, 2a02:8384:11:25e::2. These are candidate targets for direct testing.

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): Type 2 honored. Forged PTB accepted; next response shrunk. (ICMPv6 Echo + forged PTB)
• NL host (go6lab): inconclusive: no Echo Reply after PTB (probe 1500B). (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]                        0.009ms pmtu 1500
 1:  _gateway                                              0.599ms 
 1:  _gateway                                              0.728ms 
 2:  sox-pn.sox.rs                                         0.687ms 
 3:  2001:7f8:1e:8::3d                                     0.893ms asymm  2 
 4:  2001:67c:128c::699                                   24.572ms asymm  5 
 5:  no reply
 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
     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 5 (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                  0.411ms 
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.396ms 
 2:  ae0-2453.cr10.ber01.lwlcom.net                        0.827ms 
 3:  2003:0:f00::6dc                                       1.818ms 
 4:  no reply
 5:  2003:0:fe00:e::2                                     24.958ms asymm 13 
 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
     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 10 (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                  0.423ms 
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.291ms 
 2:  eth1-0-12-h5594.edge5-dus1.bb.wiit.network            1.071ms 
 3:  no reply
 4:  lag30.core3-dus1.bb.wiit.network                      0.285ms 
 5:  lag0-vl1011.core1-fra-ix.bb.wiit.network             13.069ms 
 6:  lag0-vl1001.core1-nbg-ncd.bb.wiit.network             6.713ms 
 7:  lag0-vl6.core2-nbg-ncd.bb.wiit.network                6.910ms 
 8:  lag0-vl1006.core2-muc2.bb.wiit.network                9.501ms 
 9:  lag0-vl2.core1-muc2.bb.wiit.network                  12.868ms 
10:  2001:7f8:44::20dc:0:1                                10.769ms 
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500 

From NL host (go6lab)   open

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]                        0.030ms pmtu 1500
 1:  2a00:8642:42::2                                       1.690ms 
 1:  2a00:8642:42::2                                       1.913ms 
 2:  no reply
 3:  2a00:1ca8:1::194                                      3.412ms 
 4:  2a03:3f40::10:41                                      3.988ms 
 5:  no reply
 6:  2001:730:2800::5474:8001                             31.417ms asymm  8 
 7:  2a02-8383-0000-1000-0000-0000-000b-0000.static.v6.upcbusiness.at  37.459ms asymm  9 
 8:  2a02-8386-0000-0000-0000-0002-0005-0000.static.v6.upcbusiness.at  32.716ms asymm 12 
 9:  2a02-8386-0000-0000-0000-0002-0007-0001.static.v6.upcbusiness.at  32.800ms asymm 11 
10:  no reply
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  2a02-8386-000c-f000-0000-0000-0000-000e.static.v6.upcbusiness.at  34.423ms !A
     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, hop 5, hop 7, hop 8, hop 10 (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                        0.550ms 
 2:  no reply
 3:  2a12:d8c0:109f:106::a2                                3.474ms 
 4:  ae0-303.rt.vsx.pda.it.retn.net                        3.652ms 
 5:  2001:1900:5:2:2::5b1d                                20.410ms asymm  8 
 6:  lo0.0.edge5.Berlin1.level3.net                       28.521ms asymm  8 
 7:  3320-3356-ber.sp.lumen.tech                          26.331ms 
 8:  2003:0:f00::e0a                                      17.344ms asymm  7 
 9:  2003:0:fe00:e::2                                     36.248ms asymm  8 
10:  2003:0:fe00:e::2                                     28.306ms asymm  8 
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  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)

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

tracepath -6

 1?: [LOCALHOST]                        0.016ms pmtu 9000
 1:  fw1-lju.6connect.com                                  0.705ms 
 1:  fw1-lju.6connect.com                                  0.595ms 
 2:  no reply
 3:  2a03:a100:0:201:1::1                                  1.067ms 
 4:  2a03:a100:0:201:1::1                                  1.358ms pmtu 1500
 4:  no reply
 5:  100ge0-0-0-5.core1.vie1.he.net                        8.508ms 
 6:  2a02-8383-0000-1000-0000-0000-0006-0000.static.v6.upcbusiness.at   8.764ms 
 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
     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]                        0.021ms pmtu 1500
 1:  2a01:261:313:b814::1                                  0.798ms 
 2:  2a01:260:1::225                                       2.638ms 
 3:  2a01-260-1-1--9a.core6.t-2.net                        2.322ms 
 4:  2a01-260-1-1--c.core6.t-2.net                         5.193ms 
 5:  atwre21p401.as8412.net                               10.961ms asymm  8 
 6:  atwre21p401.as8412.net                               10.755ms asymm  8 
 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
     Too many hops: pmtu 1500
     Resume: pmtu 1500