AS213115 - MMITECHPIRFC 4890 ✓RPKI -ASPA -

AS overview

Test target: 2001:67c:2474::3586:3761 · (SPF ip6: literal) · address space: PI · prefixes announced: 1

prefix(es): 2001:67c:2474::/48

SIX peering

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

We probed 35 arbitrary IPv6 address(es) inside AS213115's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2a01:260:1021::a at hop 21 - that router answers ICMPv6 Echo. This is not in AS213115's announced prefix; operationally it's the AS-edge / peering interface (often on a SIX 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): Type 2 NOT honored. Forged PTB had no effect (filtered en route or stack ignored it). (TLS handshake + forged PTB)
• DE host (Berlin): Type 2 honored. Forged PTB accepted; next response shrunk. (ICMPv6 Echo + forged PTB)
• DE host (Düsseldorf): Type 2 NOT honored. Forged PTB had no effect (filtered en route or stack ignored it). (TLS handshake + forged PTB)
• NL host (go6lab): Type 2 honored. Forged PTB accepted; next response shrunk. (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 partial. Some shrinkage but not down to 1280 bytes. (TLS handshake + forged PTB)
• SLO host (T-2): Type 2 honored. Forged PTB accepted; next response shrunk. (ICMPv6 Echo + forged PTB)

Why they disagree - different probe methods: These vantages picked different probe methods, so their verdicts are not directly comparable. The active test tries methods in order (icmp6-echo → dns-tcp → tls → http) and stops at the first that produces a definitive verdict; if the chosen method differs, the underlying evidence differs too. Most often this is because the path PMTU on one vantage is below 1500 B, so the natural Echo Reply is already fragmented and the icmp6-echo method falls through to a TCP-based one. This is largely a measurement artifact, not a destination-behaviour difference.

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)'

sudo ip6tables -L INPUT -nv | grep -iE 'icmpv6|packet-too-big'
sudo nft list ruleset 2>/dev/null | grep -A1 'icmpv6'

sudo sysctl net.ipv6.conf.all.accept_redirects net.ipv4.ip_no_pmtu_disc net.ipv6.route.mtu_expires

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 2a12:d8c0:105a:9001::a154 or src host 2a09:ab81::91 or src host 2a01:261:313:b814:2a0:98ff:fe5b:13e4 or src host 2a06:d1c1:10a::bbbb or src host 2a06:d1c1:10d::aaaa or src host 2a06:d1c1:10b::cccc)'

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]                        0.011ms pmtu 1500
 1:  _gateway                                              0.555ms 
 1:  _gateway                                              0.290ms 
 2:  sox-pn.sox.rs                                         0.533ms 
 3:  2001:7f8:1e:8::3d                                     0.627ms asymm  2 
 4:  ae8-930.RT.IRX.VIE.AT.retn.net                       12.900ms asymm  3 
 5:  2001:7f8:30:0:2:1:3:4779                             17.558ms asymm  8 
 6:  2a01-260-1-1--6.core6.t-2.net                        18.316ms asymm  8 
 7:  2a01-260-1-1--9f.core6.t-2.net                       18.792ms asymm  9 
 8:  2a01-260-1021--a.link6.t-2.net                       18.518ms asymm 10 
 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
21:  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]                        0.022ms pmtu 1500
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.514ms 
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.468ms 
 2:  ae0-2453.cr10.ber01.lwlcom.net                        0.971ms 
 3:  ae3-90.cr10.ham01.lwlcom.net                          5.036ms 
 4:  ae0-50.cr11.ham01.lwlcom.net                          5.257ms 
 5:  2a00:c380:f000::4b                                    5.561ms asymm  4 
 6:  ae4-2087.dus10.core-backbone.com                     11.751ms asymm  5 
 7:  ae21-2071.fra10.core-backbone.com                    11.006ms asymm  5 
 8:  ae2-2021.fra20.core-backbone.com                     10.846ms asymm  4 
 9:  ae6-2003.nbg20.core-backbone.com                     12.543ms asymm  6 
10:  ae2-2032.muc20.core-backbone.com                     14.930ms asymm  7 
11:  ae1-2028.vie10.core-backbone.com                     20.546ms asymm  8 
12:  2a01:4a0:1338:115::2                                 32.255ms 
13:  2a01-260-1-1--6.core6.t-2.net                        32.827ms asymm 12 
14:  2a01-260-1-1--9f.core6.t-2.net                       33.002ms asymm 13 
15:  2a01-260-1021--a.link6.t-2.net                       33.025ms asymm 14 
16:  no reply
17:  no reply
18:  no reply
19:  no reply
20:  no reply
21:  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]                        0.013ms pmtu 1500
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.304ms 
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.234ms 
 2:  ipv6.decix-dusseldorf.core1.dus1.he.net               6.373ms asymm  3 
 3:  no reply
 4:  be6.core2.ams2.he.net                                 9.412ms asymm  6 
 5:  t-2.interxionfra11.nlsix.net                         29.294ms asymm 11 
 6:  2a01-260-1-1--16.core6.t-2.net                       30.209ms asymm 11 
 7:  2a01-260-1-1--9f.core6.t-2.net                       35.248ms asymm 12 
 8:  2a01-260-1021--a.link6.t-2.net                       28.302ms asymm 13 
 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
21:  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)

tracepath -6

 1?: [LOCALHOST]                        0.032ms pmtu 1500
 1:  2a00:8642:42::2                                       2.994ms 
 1:  2a00:8642:42::2                                       1.755ms 
 2:  no reply
 3:  2a00:1ca8:1::194                                      3.656ms 
 4:  2a03:3f40::10:33                                      7.741ms 
 5:  t-2.interxionfra11.nlsix.net                         37.694ms asymm  6 
 6:  2a01-260-1-1--16.core6.t-2.net                       33.175ms asymm  7 
 7:  2a01-260-1-1--9f.core6.t-2.net                       36.195ms asymm  8 
 8:  2a01-260-1021--a.link6.t-2.net                       40.154ms asymm  9 
 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
21:  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 5 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.032ms pmtu 1500
 1:  karsolink-01.net.karsolink.com                        0.704ms 
 1:  no reply
 2:  no reply
 3:  2a12:d8c0:101f:6::1                                  10.224ms 
 4:  no reply
 5:  100ge0-0-0-20.core1.vie1.he.net                      23.046ms 
 6:  2001:7f8:30:0:2:1:3:4779                             20.521ms 
 7:  2a01-260-1-1--6.core6.t-2.net                        45.798ms asymm 11 
 8:  2a01-260-1-1--9f.core6.t-2.net                       44.354ms asymm 12 
 9:  2a01-260-1021--a.link6.t-2.net                       39.546ms asymm 13 
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
21:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500 

From SLO host (6connect)   open

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

Path (traceroute + mtr + PTR)

tracepath -6

 1?: [LOCALHOST]                        0.034ms pmtu 9000
 1:  fw1-lju.6connect.com                                  0.755ms 
 1:  fw1-lju.6connect.com                                  0.531ms 
 2:  no reply
 3:  2a03:a100:0:201:1::1                                  0.970ms 
 4:  2a03:a100:0:201:1::1                                  1.169ms pmtu 1500
 4:  six.a1.si                                             1.531ms 
 5:  2001:15c7:a000:b::1                                   1.616ms 
 6:  2001:15c7:a000:b::2                                   2.207ms asymm  7 
 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
21:  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]                        0.030ms pmtu 1500
 1:  2a01:261:313:b814::1                                  1.077ms 
 1:  2a01:261:313:b814::1                                  1.177ms 
 2:  2a01:260:1::225                                       5.965ms 
 3:  2a01-260-1-1--9c.core6.t-2.net                        2.990ms 
 4:  2a01-260-1-1--16.core6.t-2.net                        2.921ms 
 5:  2a01-260-1-1--9f.core6.t-2.net                        3.565ms 
 6:  2a01-260-1021--a.link6.t-2.net                        3.369ms 
 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
21:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500