AS50178 - LIMITIS-AS Limitis s.r.lPARFC 4890 ✓RPKI ✓ 1/1ASPA -

AS overview

Test target: 2a07:c700:0:1200::1 · ns1.zcom.it · address space: PA · prefixes announced: 1

prefix(es): 2a07:c700::/29

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

We probed 35 arbitrary IPv6 address(es) inside AS50178's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2a02:2058:2:2::b at hop 14 - that router answers ICMPv6 Echo. This is not in AS50178'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

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 2026-09-23T12:05:46Z

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

tracepath -6

 1?: [LOCALHOST]                        0.011ms pmtu 1500
 1:  _gateway                                              0.529ms 
 1:  _gateway                                              0.346ms 
 2:  2001:7f8:1e::4                                        0.848ms 
 3:  vix.as6663.net                                       13.097ms 
 4:  ip6-2a02-2720-100b-10--2.euroweb.ro                  30.080ms asymm  6 
 5:  k.limitis.net                                        29.827ms asymm  7 
 6:  fdb9:8736:30c3::1                                    29.806ms 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
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)

tracepath -6

 1?: [LOCALHOST]                        0.023ms pmtu 1500
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.450ms 
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.367ms 
 2:  ae0-2453.cr10.ber01.lwlcom.net                        0.976ms 
 3:  ae0-10.cr10.ber03.lwlcom.net                          0.989ms 
 4:  ae0-15.cr11.dtm01.lwlcom.net                          8.853ms asymm  5 
 5:  ae0-20.cr10.dtm01.lwlcom.net                          8.810ms asymm  4 
 6:  ae0-50.cr10.dus02.lwlcom.net                          8.765ms asymm  3 
 7:  ae0-20.cr10.dus01.lwlcom.net                          8.646ms asymm  4 
 8:  ae6-60.cr10.ams01.lwlcom.net                         11.714ms asymm  5 
 9:  2001:7f8:12a::110                                    17.547ms asymm  7 
10:  ip6-2a02-2720-100b-10--1.euroweb.ro                  26.020ms asymm  9 
11:  ip6-2a02-2720-100b-10--2.euroweb.ro                  31.779ms asymm 10 
12:  k.limitis.net                                        31.060ms 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 

From DE host (Düsseldorf)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

tracepath -6

 1?: [LOCALHOST]                        0.029ms pmtu 1500
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.481ms 
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.314ms 
 2:  eth1-0-12-h5594.edge5-dus1.bb.wiit.network            1.135ms 
 3:  no reply
 4:  lag30.core3-dus1.bb.wiit.network                      0.308ms 
 5:  lag0-vl1011.core1-fra-ix.bb.wiit.network              4.488ms 
 6:  lag0-vl1001.core1-nbg-ncd.bb.wiit.network             7.115ms 
 7:  lag0-vl6.core2-nbg-ncd.bb.wiit.network                6.901ms 
 8:  lag0-vl1006.core2-muc2.bb.wiit.network                9.694ms 
 9:  lag0-vl1009.core1-muc-eq3.bb.wiit.network            10.028ms 
10:  lag0-vl1001.core1-pda-vsix.bb.wiit.network           20.715ms 
11:  lag0-vl1001.core1-mil-mix.bb.wiit.network            20.270ms asymm  9 
12:  lag0-vl5.core3-mil-irid.bb.wiit.network              20.283ms asymm  8 
13:  konverto.minap.it                                    25.143ms asymm  9 
14:  k.limitis.net                                        24.808ms asymm 10 
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)   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]                        0.036ms pmtu 1500
 1:  2a00:8642:42::2                                       2.087ms 
 1:  2a00:8642:42::2                                       1.684ms 
 2:  no reply
 3:  2a00:1ca8:1::194                                      5.531ms 
 4:  2a03:3f40::10:33                                      8.302ms 
 5:  2001:7f8:1::a501:2874:1                              24.282ms 
 6:  2001:b00:1:1:3::133                                  26.199ms 
 7:  2001:b00:1:1:3::145                                  22.415ms 
 8:  2a02:2058:2:2::a                                     28.893ms asymm  5 
 9:  k.limitis.net                                        27.692ms asymm  6 
10:  fdb9:8736:30c3::1                                    27.446ms asymm  7 
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 ITA host (Karsolink)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

Rate-limited ICMPv6: hop 4 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.035ms pmtu 1500
 1:  no reply
 2:  2a12:d8c0:109f:121::a1                                0.596ms 
 3:  no reply
 4:  fastweb.minap.it                                     11.612ms 
 5:  2001:b00:1:1:3::12f                                   9.507ms 
 6:  2001:b00:1:1:3::145                                   9.946ms 
 7:  2a02:2058:2:2::a                                     15.032ms asymm  5 
 8:  k.limitis.net                                        13.804ms asymm  6 
 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]                        0.022ms pmtu 9000
 1:  fw1-lju.6connect.com                                  0.688ms 
 1:  fw1-lju.6connect.com                                  0.516ms 
 2:  no reply
 3:  no reply
 4:  2a00:ee0:1:15::2                                      1.541ms asymm  3 
 5:  2a00:ee0:1:15::2                                     29.879ms pmtu 1500
 5:  2a11:4142:2002::                                      1.299ms asymm  6 
 6:  2620:107:4008:e85::2                                  8.232ms asymm  7 
 7:  konverto-AS44512-v6.mix-it.net                        9.229ms 
 8:  2a02:2058:fe:2::b                                    15.505ms 
 9:  k.limitis.net                                        15.886ms 
10:  fdb9:8736:30c3::1                                    15.288ms 
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)

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

tracepath -6

 1?: [LOCALHOST]                        0.027ms pmtu 1500
 1:  2a01:261:313:b814::1                                  0.795ms 
 1:  2a01:261:313:b814::1                                  1.070ms 
 2:  2a01:260:1::225                                       2.575ms 
 3:  2a01-260-1-1--9c.core6.t-2.net                        3.373ms 
 4:  2001:7f8:46:0:1::3303                                10.136ms 
 5:  i00mil-005-loo179.bb.ip-plus.net                     10.350ms 
 6:  2001:4d98:a000::119                                  26.672ms asymm 11 
 7:  2001:b00:1:1:3::131                                  16.296ms asymm  8 
 8:  2001:b00:1:1:3::145                                  16.556ms asymm  9 
 9:  2a02:2058:2:2::a                                     21.078ms asymm  7 
10:  k.limitis.net                                        19.064ms asymm  8 
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