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Help me to understand why I can't connect to a specific AS

florinmarian
Level 1
Level 1

Hello, friends!
I need your help because I am unable to understand on my own where the problem is.
Long story: Subnet 188.241.240.0/24 was used via BYOIP with OVH (AS16276) in Germany even though it was still routed via my ASN 57403 from Romania where I have other peerings (I don't understand exactly how it works because I don't have nothing configured in my BGP session with AS16276, but if you are interested, 188.241.241.0/24 is also used via BYOIP with OVH currently).
To give up BYOIP for 188.241.240.0/24 all I had to do was announce that subnet via BGP with my peering with AS8708 and AS8953 respectively. After a few days I realized that I can't access the OVH network via IPv4 at all using any IP from 188.241.240.0/24 and I asked them to delete BYOIP for that subnet, they deleted it and everything went fine.. 2 weeks.
Suddenly the OVH network became unavailable again, only this time I can't in any way convince the OVH people that they have a problem.
What I want now is to find out how I can highlight if and where they have a problem in order to solve this unfortunate situation.

Any help is welcome.
Thank you!

 

Test from Romania to OVH using 1st peering only:
root@hp1:~# mtr -o 'J M X LSR NA B W V' -wzbc 50 51.77.85.115
Start: 2024-04-12T07:39:58+0300
HOST: hp1                                        Jttr  Javg  Jmax  Loss%   Snt   Rcv   Last   Avg   Best   Wrst  StDev
  1. AS57403  hosted-by.XXX.ro (188.241.240.1)   0.1   1.1  12.2   0.0%    50    50    0.6   1.2    0.5   12.8    2.3
  2. AS???    ???                                 0.0   0.0   0.0  100.0    50     0    0.0   0.0    0.0    0.0    0.0


Test from Romania to OVH using 2nd peering only:
From Romania:
root@hp1:~# mtr -o 'J M X LSR NA B W V' -wzbc 50 51.77.85.115
Start: 2024-04-08T12:30:46+0300
HOST: hp1                                        Jttr  Javg  Jmax  Loss%   Snt   Rcv   Last   Avg   Best   Wrst  StDev
  1. AS57403  hosted-by.XXX.ro (188.241.240.1)   0.0   2.9  15.9   0.0%    50    50    0.5   2.0    0.5   16.5    3.9
  2. AS8953   92.180.51.73                        0.0   0.1   0.5   0.0%    50    50   10.7  10.6   10.5   11.0    0.1
  3. AS???    ???                                 0.0   0.0   0.0  100.0    50     0    0.0   0.0    0.0    0.0    0.0


From OVH to Romania:
root@sv2:~# mtr -o 'J M X LSR NA B W V' -wzbc 50 188.241.240.250
Start: 2024-04-12T06:40:17+0200
HOST: sv2                                              Jttr  Javg  Jmax  Loss%   Snt   Rcv   Last   Avg   Best   Wrst  StDev
  1. AS16276  51.77.85.253                              0.3   0.7   5.7   0.0%    50    50    0.4   0.8    0.3    6.0    1.2
  2. AS???    ???                                       0.0   0.0   0.0  100.0    50     0    0.0   0.0    0.0    0.0    0.0
  3. AS???    ???                                       0.0   0.0   0.0  100.0    50     0    0.0   0.0    0.0    0.0    0.0
  4. AS???    ???                                       0.0   0.0   0.0  100.0    50     0    0.0   0.0    0.0    0.0    0.0
  5. AS16276  fra-fr5-sbb2-nc5.de.eu (94.23.122.246)    0.2   0.2   0.5   0.0%    50    50    1.6   1.7    1.5    2.2    0.2
  6. AS???    ???                                       0.0   0.0   0.0  100.0    50     0    0.0   0.0    0.0    0.0    0.0
  7. AS???    br01.frankfurt.rdsnet.ro (80.81.192.87)   0.1   1.0  16.0   0.0%    50    50    1.7   2.2    1.6   17.8    2.4
  8. AS???    ???                                       0.0   0.0   0.0  100.0    50     0    0.0   0.0    0.0    0.0    0.0

 

 

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