AS13092 - AMRESPI/PARPKI ✓ 1/1ASPA -

AS overview

Test target: 2001:4170:2801::1 · ban.junis.ni.ac.rs · address space: mixed · prefixes announced: 1

prefix(es): 2001:4170::/32

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

We probed 35 arbitrary IPv6 address(es) inside AS13092's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2001:798:1::1b5 at hop 15 - that router answers ICMPv6 Echo. This is not in AS13092's announced prefix; operationally it's the AS-edge / peering interface (often on a SOX 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): inconclusive: no Echo Reply after PTB (probe 1500B). (ICMPv6 Echo + forged PTB)
• DE host (Berlin): inconclusive: no Echo Reply after PTB (probe 1500B). (ICMPv6 Echo + forged PTB)
• DE host (Düsseldorf): inconclusive: no Echo Reply after PTB (probe 1500B). (ICMPv6 Echo + forged PTB)
• NL host (go6lab): inconclusive: no Echo Reply to 1300-byte probe. (ICMPv6 Echo + forged PTB)
• ITA host (Karsolink): inconclusive: no Echo Reply after PTB (probe 1500B). (ICMPv6 Echo + forged PTB)
• SLO host (6connect): inconclusive: no Echo Reply after PTB (probe 1500B). (ICMPv6 Echo + forged PTB)
• SLO host (T-2): inconclusive: no Echo Reply after PTB (probe 1500B). (ICMPv6 Echo + forged PTB)

Why they disagree - reachability mismatch: One vantage couldn't drive a flow at all to this destination (no Echo Reply or no responding TCP port), so the active test had no behavioural change to observe. The other vantage's verdict is the only meaningful one here.

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)   open

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

Path (traceroute + mtr + PTR)

Rate-limited ICMPv6: hop 6, hop 12, hop 13 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.016ms pmtu 1500
 1:  _gateway                                              0.580ms 
 1:  _gateway                                              0.313ms 
 2:  sox-pn.sox.rs                                         0.371ms 
 3:  2001:7f8:1e:8::3d                                     0.656ms asymm  2 
 4:  ae8-930.RT.IRX.VIE.AT.retn.net                       13.201ms asymm  3 
 5:  no reply
 6:  no reply
 7:  amres-ias-geant.zag.hr.geant.net                     23.574ms asymm  8 
 8:  2001:4170:1f00:38::2                                 23.646ms asymm  9 
 9:  no reply
10:  no reply
11:  2001:4170:4031::1                                    26.717ms asymm 12 
12:  2001:4170:4018::2                                    26.893ms asymm 13 
13:  ban.junis.ni.ac.rs                                   26.454ms reached
     Resume: pmtu 1500 hops 13 back 14 

From DE host (Berlin)   open

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

Path (traceroute + mtr + PTR)

Rate-limited ICMPv6: hop 10, hop 16 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.040ms pmtu 1500
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.435ms 
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.377ms 
 2:  ae0-2453.cr10.ber01.lwlcom.net                        0.851ms 
 3:  ae0-150.cr10.fra01.lwlcom.net                        10.088ms asymm  7 
 4:  ae0-100.cr10.fra02.lwlcom.net                        10.559ms asymm  8 
 5:  ae0-10.cr10.fra06.lwlcom.net                         10.133ms asymm  7 
 6:  ams-ix.1-ix.net                                      23.010ms asymm  8 
 7:  nl-ams.nordu.net                                     21.018ms asymm  9 
 8:  lonap1.nordu.net                                     21.195ms 
 9:  no reply
10:  amres-ias-geant-gw.zag.hr.geant.net                  43.450ms asymm  8 
11:  amres-ias-geant.zag.hr.geant.net                     48.796ms asymm 12 
12:  2001:4170:1f00:38::2                                 48.903ms asymm 10 
13:  no reply
14:  no reply
15:  2001:4170:4031::1                                    52.033ms asymm 13 
16:  2001:4170:4018::2                                    52.018ms asymm 14 
17:  ban.junis.ni.ac.rs                                   51.797ms reached
     Resume: pmtu 1500 hops 17 back 15 

From DE host (Düsseldorf)   open

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

Path (traceroute + mtr + PTR)

Rate-limited ICMPv6: hop 7, hop 13, hop 14 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.025ms pmtu 1500
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.465ms 
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.299ms 
 2:  eth1-0-12-h5594.edge5-dus1.bb.wiit.network            1.380ms 
 3:  no reply
 4:  lag30.core3-dus1.bb.wiit.network                      0.414ms 
 5:  lag8.core1-dus-ix.bb.wiit.network                     0.515ms 
 6:  no reply
 7:  amres-ias-geant-gw.zag.hr.geant.net                  28.325ms 
 8:  amres-ias-geant.zag.hr.geant.net                     33.549ms asymm 11 
 9:  2001:4170:1f00:38::2                                 34.082ms 
10:  no reply
11:  no reply
12:  2001:4170:4031::1                                    49.334ms 
13:  no reply
14:  ban.junis.ni.ac.rs                                   36.608ms reached
     Resume: pmtu 1500 hops 14 back 14 

From NL host (go6lab)   open

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

Path (traceroute + mtr + PTR)

Rate-limited ICMPv6: hop 9, hop 15, hop 16, hop 21 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.042ms pmtu 1500
 1:  2a00:8642:42::2                                       3.902ms 
 1:  2a00:8642:42::2                                       5.018ms 
 2:  gw.friends.steffann.nl                                2.840ms 
 3:  2a00:1ca8:1::194                                      3.815ms 
 4:  2a03:3f40::10:41                                      3.049ms 
 5:  2001:978:2:40::3:1                                    4.306ms 
 6:  be3458.ccr42.ams03.atlas.cogentco.com                25.345ms 
 7:  be3343.ccr41.fra05.atlas.cogentco.com                15.755ms 
 8:  be5516.ccr21.muc03.atlas.cogentco.com                20.046ms 
 9:  be9456.ccr82.vie01.atlas.cogentco.com                25.250ms 
10:  be9463.ccr21.bts01.atlas.cogentco.com                25.133ms 
11:  be3261.ccr31.bud01.atlas.cogentco.com                29.914ms 
12:  be8805.agr61.bud01.atlas.cogentco.com                29.026ms 
13:  be9979.rcr51.b020664-1.bud01.atlas.cogentco.com      27.389ms 
14:  no reply
15:  amres-ias-geant-gw.zag.hr.geant.net                  33.851ms asymm  8 
16:  amres-ias-geant.zag.hr.geant.net                     37.920ms asymm 10 
17:  2001:4170:1f00:38::2                                 38.117ms asymm 10 
18:  no reply
19:  no reply
20:  2001:4170:4031::1                                    48.154ms asymm 13 
21:  no reply
22:  ban.junis.ni.ac.rs                                   44.216ms reached
     Resume: pmtu 1500 hops 22 back 15 

From ITA host (Karsolink)   open

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

Path (traceroute + mtr + PTR)

Rate-limited ICMPv6: hop 3, hop 7, hop 13, hop 14 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.068ms pmtu 1500
 1:  karsolink-01.net.karsolink.com                        0.555ms 
 2:  2a12:d8c0:109f:121::a1                                0.620ms 
 3:  2a12:d8c0:101f:103::1                                 8.770ms 
 4:  ae0-303.rt.vsx.pda.it.retn.net                       25.416ms 
 5:  rt.irx.vie.at.retn.net                               11.726ms 
 6:  amres-ias-geant-gw.zag.hr.geant.net                  18.593ms asymm  7 
 7:  amres-ias-geant.zag.hr.geant.net                     24.039ms asymm  8 
 8:  2001:4170:1f00:38::2                                 24.365ms asymm  9 
 9:  2001:4170:1f00:38::2                                 23.448ms 
10:  no reply
11:  2001:4170:4031::1                                    27.235ms asymm 12 
12:  2001:4170:4018::2                                    27.553ms asymm 13 
13:  ban.junis.ni.ac.rs                                   26.913ms reached
     Resume: pmtu 1500 hops 13 back 14 

From SLO host (6connect)   open

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

Path (traceroute + mtr + PTR)

Rate-limited ICMPv6: hop 5, hop 7, hop 13 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.056ms pmtu 9000
 1:  fw1-lju.6connect.com                                  0.398ms 
 1:  fw1-lju.6connect.com                                  0.458ms 
 2:  no reply
 3:  2a03:a100:0:201:1::1                                  4.066ms 
 4:  2a03:a100:0:201:1::1                                  0.919ms pmtu 1500
 4:  e0-1.core1.lju1.he.net                                3.786ms 
 5:  no reply
 6:  no reply
 7:  amres-ias-geant-gw.zag.hr.geant.net                  14.486ms asymm  8 
 8:  amres-ias-geant.zag.hr.geant.net                     19.638ms asymm 10 
 9:  2001:4170:1f00:38::2                                 22.250ms asymm 10 
10:  no reply
11:  no reply
12:  2001:4170:4031::1                                    24.324ms asymm 14 
13:  2001:4170:4018::2                                    23.267ms asymm 15 
14:  ban.junis.ni.ac.rs                                   22.890ms reached
     Resume: pmtu 1500 hops 14 back 16 

From SLO host (T-2)   open

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

Path (traceroute + mtr + PTR)

Rate-limited ICMPv6: hop 8, hop 15 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.031ms pmtu 1500
 1:  2a01:261:313:b814::1                                  0.785ms 
 1:  2a01:261:313:b814::1                                  0.938ms 
 2:  2a01:260:1::225                                       2.842ms 
 3:  2a01-260-1-1--9c.core6.t-2.net                        2.938ms 
 4:  2a01-260-1-1--39.core6.t-2.net                        2.123ms asymm  3 
 5:  hurricane-electric.nikhef.nlsix.net                  40.558ms asymm  4 
 6:  no reply
 7:  no reply
 8:  amres-ias-geant.zag.hr.geant.net                     49.528ms asymm  9 
 9:  2001:4170:1f00:38::2                                 43.658ms asymm 11 
10:  2001:4170:1f00:38::2                                 50.382ms asymm 11 
11:  no reply
12:  2001:4170:4031::1                                    54.061ms asymm 13 
13:  2001:4170:4031::1                                    52.017ms 
14:  2001:4170:4018::2                                    48.888ms 
15:  ban.junis.ni.ac.rs                                   52.694ms reached
     Resume: pmtu 1500 hops 15 back 15