AS216258 - eox-faster EOX IT ServicesPARFC 4890 ✓RPKI ✓ 11/11ASPA -

AS overview

Test target: 2a13:2141:1:3501::5353 · ns1.eox.at · address space: PA · prefixes announced: 11

prefix(es): 2a13:2140:53::/48, 2a13:2144:2::/48, 2a13:2140:80::/48, 2a13:2140:900::/48, 2a13:2144:5::/48, 2a13:2140:25::/48, 2a13:2144:1::/48, 2a13:2140:389::/48 (+3 more)

VIX / AAIX / SAIX / TIROL-IX / ERA-IX peering

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

We probed 70 arbitrary IPv6 address(es) inside AS216258's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2a02:e98:1:4:32::105 at hop 13 - that router does not answer ICMPv6 Echo. This is not in AS216258'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

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): Type 2 NOT honored. Forged PTB had no effect (filtered en route or stack ignored it). (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 - path-asymmetric Type 2 filtering: Both vantages used the ICMPv6 Echo + forged-PTB method on the same destination IP, but reached different verdicts. The destination's stack is the same in both cases - so the difference is in the path: a transit AS on one route filters our forged Type 2 (or its return ICMPv6 carrying the embedded packet) while the other route delivers it intact. The vantage that says honored shows what the destination's stack actually does; the one that says not honored shows that the path between us and them drops Type 2.

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]                        0.019ms pmtu 1500
 1:  _gateway                                              0.586ms 
 1:  _gateway                                              0.312ms 
 2:  2001:7f8:1e::4                                        0.803ms 
 3:  gw.six.sk                                            11.369ms 
 4:  CETIN-gw.six.sk                                      17.397ms asymm  8 
 5:  2a07:1f40:2:68::2                                    19.974ms asymm  8 
 6:  2a02:e98:1:4:32::105                                 18.590ms asymm  9 
 7:  2a02:e98:1a:1481:183::57                             19.905ms asymm 10 
 8:  arcueid1.eox.at                                      18.437ms asymm 11 
 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)

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

tracepath -6

 1?: [LOCALHOST]                        0.027ms pmtu 1500
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.459ms 
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.432ms 
 2:  ae0-2453.cr10.ber01.lwlcom.net                        0.988ms 
 3:  ae3-90.cr10.ham01.lwlcom.net                          5.076ms 
 4:  ae0-50.cr11.ham01.lwlcom.net                          5.023ms 
 5:  2a00:c380:f000::4b                                    5.511ms asymm  4 
 6:  ae4-2087.dus10.core-backbone.com                     11.461ms asymm  5 
 7:  ae21-2071.fra10.core-backbone.com                    11.052ms asymm  5 
 8:  ae2-2001.nbg30.core-backbone.com                     12.322ms asymm  7 
 9:  ae1-2053.prg10.core-backbone.com                     16.052ms asymm  8 
10:  2a01:4a0:1338:143::2                                 16.108ms asymm  9 
11:  cust-faster.sh.cz                                    23.445ms asymm  8 
12:  no reply
13:  2a02:e98:1:4:32::105                                 22.962ms asymm  9 
14:  2a02:e98:1a:1481:183::57                             23.223ms asymm 10 
15:  arcueid1.eox.at                                      23.381ms asymm 11 
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)

Rate-limited ICMPv6: hop 6, hop 7, hop 9, hop 11 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.031ms pmtu 1500
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  6.449ms 
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.396ms 
 2:  eth1-0-12-h5594.edge5-dus1.bb.wiit.network            1.358ms 
 3:  no reply
 4:  lag30.core3-dus1.bb.wiit.network                      0.555ms 
 5:  lag8.core1-dus-ix.bb.wiit.network                     0.604ms 
 6:  decixv6.cetin.cz                                     15.750ms asymm  7 
 7:  no reply
 8:  2a07:1f40:2:68::2                                    19.352ms asymm  7 
 9:  2a02:e98:1:4:32::105                                 27.406ms asymm  8 
10:  2a02:e98:1a:1481:183::57                             18.507ms asymm  9 
11:  arcueid1.eox.at                                      18.947ms asymm 10 
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)

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

tracepath -6

 1?: [LOCALHOST]                        0.077ms pmtu 1500
 1:  2a00:8642:42::2                                       3.461ms 
 1:  2a00:8642:42::2                                       1.721ms 
 2:  no reply
 3:  2a00:1ca8:1::194                                      9.638ms 
 4:  2a03:3f40::10:33                                      9.585ms 
 5:  2001:7f8:1::a502:8725:1                              21.658ms asymm  9 
 6:  2a07:1f40:2:68::2                                    29.989ms asymm 10 
 7:  2a02:e98:1:4:32::105                                 28.374ms asymm 11 
 8:  2a02:e98:1a:1481:183::57                             24.425ms asymm 12 
 9:  arcueid1.eox.at                                      24.324ms 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 ITA host (Karsolink)   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]                        0.033ms pmtu 1500
 1:  karsolink-01.net.karsolink.com                        0.684ms 
 2:  2a12:d8c0:109f:121::a1                                0.899ms 
 3:  2a12:d8c0:109f:106::a2                                3.698ms 
 4:  ae0-303.RT.VSX.PDA.IT.retn.net                       11.705ms 
 5:  RT.TC2.AMS.NL.retn.net                               20.869ms asymm  7 
 6:  2001:7f8:1::a502:8725:1                              35.676ms 
 7:  2a07:1f40:2:68::2                                    48.050ms asymm  6 
 8:  2a02:e98:1:4:32::105                                598.475ms asymm  7 
 9:  2a02:e98:1a:1481:183::57                             38.279ms asymm  8 
10:  arcueid1.eox.at                                      36.917ms asymm  9 
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)   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]                        0.017ms pmtu 9000
 1:  fw1-lju.6connect.com                                  0.552ms 
 1:  fw1-lju.6connect.com                                  0.701ms 
 2:  no reply
 3:  2a03:a100:0:201:1::1                                  0.917ms 
 4:  2a03:a100:0:201:1::1                                  1.159ms pmtu 1500
 4:  e0-1.core1.lju1.he.net                                2.390ms 
 5:  100ge0-0-0-5.core1.vie1.he.net                        9.845ms 
 6:  be3.core1.prg1.he.net                                13.942ms 
 7:  no reply
 8:  nix4-ipv6.faster.cz                                  20.111ms 
 9:  2a02:e98:1:4:32::105                                 14.718ms 
10:  2a02:e98:1a:1481:183::57                             14.432ms 
11:  arcueid1.eox.at                                      15.229ms 
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)

Rate-limited ICMPv6: hop 6, hop 7 (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                                  0.955ms 
 1:  2a01:261:313:b814::1                                  0.896ms 
 2:  2a01:260:1::225                                       2.494ms 
 3:  2a01-260-1-1--9c.core6.t-2.net                        4.100ms 
 4:  2a01-260-1-1--39.core6.t-2.net                        2.804ms asymm  3 
 5:  hurricane-electric.nikhef.nlsix.net                  38.728ms asymm  4 
 6:  be7.core2.fra2.he.net                                42.498ms asymm  5 
 7:  be8.core1.prg1.he.net                                33.277ms asymm  6 
 8:  be8.core1.prg1.he.net                                29.758ms asymm  6 
 9:  no reply
10:  2a02:e98:1:4:32::105                                 36.728ms asymm  9 
11:  2a02:e98:1a:1481:183::57                             31.045ms asymm 10 
12:  ???                                                  36.464ms asymm 11 
13:  arcueid1.eox.at                                      36.564ms asymm 11 
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