AS2107 - ARNESPI/PARFC 4890 ✓RPKI ✓ 2/2ASPA -

AS overview

Test target: 2001:1470:8000::87 · aa.arnes.si · address space: mixed · prefixes announced: 2

prefix(es): 2001:1470::/29, 2001:1470::/32

SIX peering

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

At least one router inside AS2107's announced prefix replied during the random-target probe. Hop(s): 2001:1470:a:74::b. These are candidate targets for direct testing.

ICMPv6 Type 2 (Packet Too Big) acceptance - active test

Type 2 honored. Forged ICMPv6 PTB (MTU=1280) was accepted by the destination's stack: the next 1500-byte Echo Reply arrived split into 2 fragments via the IPv6 Fragment Header.
method: ICMPv6 Echo + forged PTB, tested 2026-09-23T10:31:23Z

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 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.010ms pmtu 1500
 1:  _gateway                                              0.480ms 
 1:  _gateway                                              0.523ms 
 2:  sox-pn.sox.rs                                         0.730ms 
 3:  2001:7f8:1e:8::3d                                     0.584ms asymm  2 
 4:  2001:67c:128c::699                                   18.120ms 
 5:  2001:1470:8000:713::2                                46.511ms !H
     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 13 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.023ms pmtu 1500
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.582ms 
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.958ms 
 2:  ae0-2453.cr10.ber01.lwlcom.net                        1.548ms 
 3:  ae0-150.cr10.fra01.lwlcom.net                        10.579ms asymm  7 
 4:  ae0-100.cr10.fra02.lwlcom.net                        10.665ms asymm  8 
 5:  ae0-10.cr10.fra06.lwlcom.net                         10.620ms asymm  7 
 6:  ams-ix.1-ix.net                                      44.814ms asymm  8 
 7:  nl-ams.nordu.net                                     21.213ms asymm  9 
 8:  lonap1.nordu.net                                     21.334ms 
 9:  no reply
10:  arnes-ias-geant-gw.rt1.lju.si.geant.net              41.370ms asymm  8 
11:  arnes-ias-geant.rt1.lju.si.geant.net                 41.472ms asymm  9 
12:  rljtpl1.bb.arnes.si                                  41.623ms asymm 11 
13:  no reply
14:  2001:1470:8000:713::2                                42.156ms !H
     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]                        0.025ms pmtu 1500
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.666ms 
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.446ms 
 2:  eth1-0-12-h5594.edge5-dus1.bb.wiit.network            2.484ms 
 3:  no reply
 4:  lag30.core3-dus1.bb.wiit.network                      0.497ms 
 5:  lag8.core1-dus-ix.bb.wiit.network                     0.523ms 
 6:  no reply
 7:  arnes-ias-geant-gw.rt1.lju.si.geant.net              26.234ms 
 8:  arnes-ias-geant.rt1.lju.si.geant.net                 28.827ms 
 9:  rljtpl1.bb.arnes.si                                  26.319ms asymm 10 
10:  2001:1470:8000:713::2                                26.657ms 
11:  no reply
12:  2001:1470:8000:713::2                                26.601ms !H
     Resume: pmtu 1500 

From NL host (go6lab)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

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

tracepath -6

 1?: [LOCALHOST]                        0.037ms pmtu 1500
 1:  ???                                                 793.972ms 
 1:  ???                                                   1.627ms 
 2:  no reply
 3:  2a00:1ca8:1::194                                      6.394ms 
 4:  2a03:3f40::10:41                                      3.794ms 
 5:  2001:978:2:40::3:1                                    4.647ms 
 6:  be3458.ccr42.ams03.atlas.cogentco.com                 6.274ms 
 7:  be2950.ccr42.fra05.atlas.cogentco.com                12.704ms 
 8:  be5516.ccr21.muc03.atlas.cogentco.com                18.458ms 
 9:  be5456.ccr81.vie01.atlas.cogentco.com                22.499ms 
10:  be4079.agr61.vie01.atlas.cogentco.com                22.241ms 
11:  be9461.rcr62.lju01.atlas.cogentco.com                28.262ms 
12:  be9462.nr61.b021176-0.lju01.atlas.cogentco.com       30.314ms 
13:  2001:978:2:39::12:2                                  26.740ms asymm  9 
14:  rljtpl1.bb.arnes.si                                  28.158ms asymm 10 
15:  2001:1470:8000:713::2                                41.028ms asymm 11 
16:  no reply
17:  2001:1470:8000:713::2                                30.095ms !H
     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 10 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.097ms pmtu 1500
 1:  no reply
 2:  2a12:d8c0:109f:121::a1                                0.804ms 
 3:  2a12:d8c0:101f:103::1                                 8.975ms 
 4:  2a03:b020:1:51::a                                    10.496ms 
 5:  2a03:b020::246                                       88.982ms 
 6:  arnes-ias-geant-gw.rt1.lju.si.geant.net              14.930ms asymm  7 
 7:  arnes-ias-geant-gw.rt1.lju.si.geant.net              13.832ms 
 8:  rljtpl1.bb.arnes.si                                  14.826ms asymm  9 
 9:  2001:1470:8000:713::2                                14.991ms asymm 10 
10:  2001:1470:8000:713::2                                15.062ms !H
     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]                        0.022ms pmtu 9000
 1:  fw1-lju.6connect.com                                  0.747ms 
 1:  fw1-lju.6connect.com                                  0.602ms 
 2:  no reply
 3:  2a03:a100:0:201:1::1                                  0.968ms 
 4:  2a03:a100:0:201:1::1                                  1.063ms pmtu 1500
 4:  rarnes1.six.si                                        1.279ms 
 5:  rljijs1.bb.arnes.si                                 203.059ms 
 6:  2001:1470:8000:712::2                                 1.461ms 
 7:  2001:1470:8000:712::2                                 1.190ms !H
     Resume: 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                                       8.600ms 
 3:  2a01-260-1-1--9c.core6.t-2.net                        3.003ms 
 4:  rarnes1.six.si                                        2.852ms 
 5:  rljijs1.bb.arnes.si                                   2.299ms 
 6:  2001:1470:8000:712::2                                 3.018ms 
 7:  2001:1470:8000:712::2                                 3.841ms !H
     Resume: pmtu 1500