AS49088 - TELMEKOM-AS TELMEKOM SRLPI/PARFC 4890 ✓RPKI ✓ 2/2ASPA -

AS overview

Test target: 2a07:3d00::43 · ns1.tkom.io · address space: mixed · prefixes announced: 2

prefix(es): 2a07:3d00::/29, 2001:67c:edc::/48

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

At least one router inside AS49088's announced prefix replied during the random-target probe. Hop(s): 2a07:3d00:0:2::129, 2a07:3d00:0:2::130, 2a07:3d00:0:2::135, 2a07:3d00:0:2::136, 2a07:3d00:0:3::164. 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)

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

tracepath -6

 1?: [LOCALHOST]                        0.012ms pmtu 1500
 1:  _gateway                                              0.465ms 
 1:  _gateway                                              0.706ms 
 2:  sox-pn.sox.rs                                         0.458ms 
 3:  e0-33.core2.beg1.he.net                               1.416ms 
 4:  e0-34.core2.bts1.he.net                               8.751ms 
 5:  100ge0-0-0-2.core1.vie1.he.net                       11.149ms 
 6:  be3.core1.prg1.he.net                                15.134ms 
 7:  be8.core4.fra1.he.net                                22.409ms 
 8:  no reply
 9:  port-channel12.core2.fra1.he.net                     20.278ms 
10:  telmekom-srl.ve104.core3.fra1.he.net                 38.738ms asymm  6 
11:  sr1.fra-100GXX-sr1.bzs.net.tkom.io                   34.647ms asymm  6 
12:  bgp1.c.net.tkom.io                                   39.413ms asymm  7 
13:  bng2.c.net.tkom.io                                   34.425ms asymm  8 
14:  fw.net.tkom.io                                       34.182ms asymm  9 
15:  no reply
16:  no reply
17:  no reply
18:  no reply
19:  no reply
20:  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, hop 6, hop 8 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.024ms pmtu 1500
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.652ms 
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.524ms 
 2:  ae0-2453.cr10.ber01.lwlcom.net                        1.163ms 
 3:  hurricane-electric.bcix.de                           17.961ms asymm  6 
 4:  no reply
 5:  be47.core1.prg1.he.net                               15.487ms asymm  6 
 6:  be8.core4.fra1.he.net                                15.581ms asymm  5 
 7:  no reply
 8:  port-channel12.core2.fra1.he.net                     14.845ms asymm  5 
 9:  telmekom-srl.ve104.core3.fra1.he.net                 26.367ms asymm 12 
10:  sr1.fra-100GXX-sr1.bzn.net.tkom.io                   30.767ms asymm 12 
11:  bgp1.c.net.tkom.io                                   30.906ms asymm 13 
12:  bng2.c.net.tkom.io                                   26.307ms asymm 14 
13:  fw.net.tkom.io                                       30.256ms asymm 15 
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
19:  no reply
20:  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)

tracepath -6

 1?: [LOCALHOST]                        0.026ms pmtu 1500
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.545ms 
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.419ms 
 2:  eth1-0-12-h5594.edge5-dus1.bb.wiit.network            1.313ms 
 3:  no reply
 4:  lag30.core3-dus1.bb.wiit.network                      0.646ms 
 5:  lag8.core1-dus-ix.bb.wiit.network                     0.847ms 
 6:  sr1-decix.fra.net.tkom.io                            21.940ms asymm 11 
 7:  sr1.fra-100GXX-sr1.bzn.net.tkom.io                   21.999ms asymm 11 
 8:  bgp1.c.net.tkom.io                                   17.042ms asymm 12 
 9:  bng1.c.net.tkom.io                                   17.024ms asymm 13 
10:  fw.net.tkom.io                                       21.336ms asymm 14 
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
19:  no reply
20:  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 4, hop 6 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.083ms pmtu 1500
 1:  2a00:8642:42::2                                       2.642ms 
 1:  2a00:8642:42::2                                       2.324ms 
 2:  gw.friends.steffann.nl                                3.331ms 
 3:  speed-ix.he.net                                       8.151ms 
 4:  be2.core4.fra1.he.net                                13.582ms 
 5:  no reply
 6:  port-channel12.core2.fra1.he.net                     16.021ms 
 7:  telmekom-srl.ve104.core3.fra1.he.net                 12.407ms 
 8:  sr1.fra-100GXX-sr1.bzn.net.tkom.io                   36.127ms 
 9:  bgp1.c.net.tkom.io                                   33.760ms 
10:  bng1.c.net.tkom.io                                   32.436ms 
11:  fw.net.tkom.io                                       28.336ms 
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
19:  no reply
20:  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)

tracepath -6

 1?: [LOCALHOST]                        0.029ms pmtu 1500
 1:  no reply
 2:  no reply
 3:  no reply
 4:  2001:7f8:b9::50:1                                    14.391ms asymm  5 
 5:  bgp1.c.net.tkom.io                                   14.490ms asymm  6 
 6:  bng2.c.net.tkom.io                                   14.764ms asymm  7 
 7:  fw.net.tkom.io                                       14.163ms asymm  8 
 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
18:  no reply
19:  no reply
20:  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 3 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.024ms pmtu 9000
 1:  fw1-lju.6connect.com                                  0.568ms 
 1:  fw1-lju.6connect.com                                  0.459ms 
 2:  no reply
 3:  no reply
 4:  2a00:ee0:1:15::2                                      1.739ms asymm  3 
 5:  2a00:ee0:1:10::2                                      2.030ms pmtu 1500
 5:  sr1-decix.fra.net.tkom.io                            23.239ms asymm  7 
 6:  sr1.fra-100GXX-sr1.bzn.net.tkom.io                   23.524ms asymm  8 
 7:  bgp1.c.net.tkom.io                                   23.831ms asymm  8 
 8:  bng2.c.net.tkom.io                                   18.615ms asymm  9 
 9:  fw.net.tkom.io                                       22.825ms asymm 11 
10:  no reply
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
19:  no reply
20:  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]                        0.029ms pmtu 1500
 1:  no reply
 2:  2a01:260:1::225                                       8.960ms 
 3:  2a01-260-1-1--9c.core6.t-2.net                        3.390ms 
 4:  2a01-260-1-1--38.core6.t-2.net                        2.589ms asymm  3 
 5:  port-channel1.core1.zag2.he.net                      10.030ms asymm  7 
 6:  port-channel1.core1.zag2.he.net                      10.951ms asymm  7 
 7:  telmekom-v6.mix-it.net                               17.414ms 
 8:  telmekom.minap.it                                    22.419ms asymm  7 
 9:  sr1.mil-100GXX-sr1.bzs.net.tkom.io                   22.358ms asymm  8 
10:  bgp2.c.net.tkom.io                                   21.485ms asymm  9 
11:  fw.net.tkom.io                                       21.238ms 
12:  fw.net.tkom.io                                       21.243ms asymm 11 
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
19:  no reply
20:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500