Forgot to mention, this presentation is a great use to using traceroute
to troubleshoot effectively and is worth a read, even for experienced
netengs :)
It’s certainly refreshed my memory on few things.
https://archive.nanog.org/meetings/nanog47/presentations/Sunday/RAS_Traceroute_N47_Sun.pdf
https://youtu.be/WL0ZTcfSvB4
Cheers,
--
Will Hargrave
Technical Director
LONAP Ltd
On 10 Dec 2020, at 14:03, Will Hargrave wrote:
Hi Chris,
It’s going to be difficult for many UKNOF people to have visibility
of any problem here because both AS8468 and AS39326 have a
well-considered interconnection policy, both public and private, and
would be reached by most of us over peering. It’s a bit surprising
that AS39537 is on peeringdb as present in MA1 and THN but just uses
transit providers to reach other UK networks - but I would say that, I
operate an internet exchange :-)
My gut feeling is the problem’s in the reverse path (traffic towards
you). You could look at some looking glasses to see what routes they
are using towards you - e.g HSO have a LG at http://as39326.net/lg
A RIPE Atlas probe also might help you track it down, if there’s one
in your AS.
--
Will Hargrave
Technical Director
LONAP Ltd
On 10 Dec 2020, at 12:26, Chris Boot wrote:
Hi all,
Sorry for the vague subject, but we've been experiencing intermittent
packet loss on certain routes a long way downstream from us since
~10:35 this morning. Some example MTRs:
Start: 2020-12-10T12:23:40+0000
HOST: sea Loss% Snt Last Avg Best
Wrst StDev
1. AS39537 31.210.128.187 0.0% 100 0.7 0.8 0.3
1.4 0.3
2. AS39537 31.210.134.25 0.0% 100 1.0 2.0 0.7
75.7 7.4
3. AS39537 31.210.132.58 0.0% 100 2.3 2.7 1.6
19.5 2.3
4. AS39537 31.210.132.54 0.0% 100 2.9 4.5 1.8
164.9 16.5
5. AS39537 31.210.132.11 0.0% 100 6.1 7.8 4.9
183.6 17.9
6. AS174 149.6.2.137 0.0% 100 6.4 6.4 5.2
34.8 2.9
7. AS1299 62.115.9.28 19.0% 100 6.2 6.1 5.4
6.9 0.3
8. AS1299 62.115.122.180 1.0% 100 6.0 6.4 5.2
26.3 2.3
9. AS1299 62.115.120.239 42.0% 100 5.8 7.2 5.3
39.0 5.7
10. AS??? ??? 100.0 100 0.0 0.0 0.0
0.0 0.0
11. AS39326 185.75.28.175 0.0% 100 5.7 6.1 5.3
12.7 0.8
12. AS39326 77.75.104.53 5.0% 100 6.7 6.3 5.6
7.9 0.4
13. AS??? ??? 100.0 100 0.0 0.0 0.0
0.0 0.0
14. AS199448 185.6.199.186 4.0% 100 17.5 20.1 15.1
33.8 4.1
Start: 2020-12-10T12:23:32+0000
HOST: sea Loss% Snt Last Avg Best
Wrst StDev
1. AS39537 31.210.128.187 0.0% 100 0.7 0.9 0.3
2.0 0.3
2. AS39537 31.210.134.25 0.0% 100 1.0 4.0 0.6
166.7 19.5
3. AS39537 31.210.132.58 0.0% 100 5.4 6.9 4.9
127.0 12.1
4. AS39537 31.210.132.54 0.0% 100 5.5 7.3 5.0
154.7 14.9
5. AS39537 31.210.132.11 0.0% 100 5.3 8.1 4.9
156.6 16.9
6. AS39537 31.210.132.50 0.0% 100 5.3 7.8 5.0
199.6 19.4
7. AS3356 212.187.173.117 0.0% 100 5.4 5.8 5.0
7.5 0.4
8. AS3356 4.69.202.178 0.0% 100 5.5 7.7 5.2
52.6 7.2
9. AS3356 212.187.165.14 9.0% 100 6.5 6.9 6.1
9.1 0.5
10. AS8468 188.39.127.175 12.0% 100 6.5 7.0 6.2
8.9 0.4
11. AS8468 188.39.127.147 7.0% 100 6.8 7.1 6.0
32.2 2.7
12. AS8468 188.39.127.73 8.0% 100 6.3 6.3 5.6
7.4 0.3
13. AS??? ??? 100.0 100 0.0 0.0 0.0
0.0 0.0
14. AS??? ??? 100.0 100 0.0 0.0 0.0
0.0 0.0
15. AS8468 87.127.233.205 7.0% 100 9.9 10.5 9.8
17.4 0.8
Any information on this would be really handy so we can let our
clients know what's going on.
Many thanks,
Chris
--
Chris Boot
[email protected]
