Gateways: IPv6 doesnt work from ohlauer and saarbruecker

[FFHener]

This doesnt affect gateways connected to cummunity-ix

Ohlauer (Monitoring)

root@ohlauer-gw:~# mtr -r -6 google.com
Start: 2024-10-25T10:27:44+0200
HOST: ohlauer-gw                  Loss%   Snt   Last   Avg  Best  Wrst StDev
  1.|-- 2a04:d480:1c01::           0.0%    10    0.4   0.5   0.4   0.6   0.1
  2.|-- ae1-0.bgr1-r1.de.syseleve  0.0%    10    0.5   1.4   0.5   3.9   1.4
  3.|-- ae1-0.box1-r2.de.syseleve  0.0%    10    0.6   0.8   0.6   0.9   0.1
  4.|-- ae0-0.box1-r1.de.syseleve  0.0%    10    0.7   0.8   0.7   1.0   0.1
  5.|-- ae8-0.blu1-r1.de.syseleve  0.0%    10    0.8   1.0   0.8   1.8   0.3
  6.|-- ???                       100.0    10    0.0   0.0   0.0   0.0   0.0

Saarbruecker (Monitoring)

root@saarbruecker-gw:~# mtr -r -6 google.com
Start: 2024-10-25T10:35:23+0200
HOST: saarbruecker-gw             Loss%   Snt   Last   Avg  Best  Wrst StDev
  1.|-- ge-0-1-8.bsa1-cpe1.de.sys  0.0%    10    4.6   8.2   0.4  15.2   4.3
  2.|-- xe-1-0-4-0.blu1-r1.de.sys  0.0%    10    0.6   1.2   0.6   3.0   0.7
  3.|-- ???                       100.0    10    0.0   0.0   0.0   0.0   0.0

Weirdly this only the case if you ping directly from the gateway. If you go 1 hop further away suddenly it works:

root@emma-core:~# mtr -r -6 google.com
Start: 2024-10-25T12:03:28+0200
HOST: emma-core                   Loss%   Snt   Last   Avg  Best  Wrst StDev
  1.|-- ohlauer-gw.olsr            0.0%    10    1.4   1.5   1.3   1.9   0.2
  2.|-- 2a04:d480:1c01::           0.0%    10    1.4   1.7   1.4   2.9   0.5
  3.|-- ae3-0.blu1-r1.de.syseleve  0.0%    10    1.9   2.4   1.8   3.3   0.6
  4.|-- 2a11:4140:1002::2          0.0%    10    1.7   1.7   1.5   1.9   0.1
  5.|-- 2a11:4140::7               0.0%    10   10.4  10.3   9.9  11.2   0.3
  6.|-- ???                       100.0    10    0.0   0.0   0.0   0.0   0.0
  7.|-- ???                       100.0    10    0.0   0.0   0.0   0.0   0.0
  8.|-- 2001:4860:1:1::34ed        0.0%    10    9.9  10.1   9.9  10.6   0.2
  9.|-- 2001:4860:1:1::34ec        0.0%    10   10.0  10.1   9.8  10.5   0.2
 10.|-- 2a00:1450:8155::1          0.0%    10   10.4  10.3  10.0  10.9   0.3
 11.|-- 2001:4860:0:1::5010        0.0%    10   10.8  10.2   9.9  10.8   0.3
 12.|-- 2001:4860:0:1::5895        0.0%    10   10.0  10.4  10.0  11.7   0.5
 13.|-- fra24s12-in-x0e.1e100.net  0.0%    10   10.0  10.2   9.8  11.5   0.5

root@sama-core:~# mtr -r -6 google.com
Start: 2024-10-25T12:03:53+0200
HOST: sama-core                   Loss%   Snt   Last   Avg  Best  Wrst StDev
  1.|-- mid2.saarbruecker-gw.olsr  0.0%    10    1.7   2.1   1.1   5.2   1.4
  2.|-- ge-0-1-8.bsa1-cpe1.de.sys  0.0%    10    2.9   3.1   1.5   6.9   1.5
  3.|-- xe-1-0-4-0.blu1-r2.de.sys  0.0%    10    3.0   3.6   1.3  12.1   3.2
  4.|-- ae0-0.blu1-r1.de.syseleve  0.0%    10    2.5   9.5   1.1  73.7  22.6
  5.|-- 2a11:4140:1002::2          0.0%    10    2.9   2.4   1.1   4.0   1.0
  6.|-- 2a11:4140::7               0.0%    10   10.2  10.1   9.8  11.5   0.5
  7.|-- ???                       100.0    10    0.0   0.0   0.0   0.0   0.0
  8.|-- ???                       100.0    10    0.0   0.0   0.0   0.0   0.0
  9.|-- 2001:4860:1:1::34ed        0.0%    10    9.5  10.3   9.3  12.0   0.9
 10.|-- 2001:4860:1:1::34ec        0.0%    10    9.8  10.2   9.4  11.2   0.5
 11.|-- 2a00:1450:814d::1          0.0%    10   11.2  11.0   9.7  13.4   1.1
 12.|-- 2001:4860:0:1::11fe        0.0%    10    9.9  10.1   9.6  11.0   0.5
 13.|-- 2001:4860:0:1::869a        0.0%    10   11.9  14.4  10.9  25.9   4.8
 14.|-- 2001:4860::c:4003:364e     0.0%    10    9.9  10.7   9.9  13.2   1.0
 15.|-- 2001:4860::1:0:d0d8        0.0%    10   10.6  11.3  10.5  13.0   0.8
 16.|-- 2001:4860:0:1::5895        0.0%    10   10.7  10.5   9.9  12.1   0.8
 17.|-- fra24s12-in-x0e.1e100.net  0.0%    10    9.9  10.4   9.8  13.0   1.0

[spolack]

Its likely possible that Inter.link started to filter the IPv6 transfer networks, which shouldnt harm us. What we try is to change the source address selection. It might be also smart to configure bird to install the default route from the peer as a source specific route (::0 from 2001:bf7::/32 via NEXTHOP)