[AusNOG] Telstra Insanity?
Beeson, Ayden
abeeson at csu.edu.au
Thu Oct 11 16:48:30 EST 2018
The latency checks are the dead giveaway here, when it splits from 3 results to 2/1 you know you are getting equal cost split.
Cheers,
Ayden
From: AusNOG <ausnog-bounces at lists.ausnog.net> on behalf of Benoit Page-Guitard <benoit.page at hostopia.com.au>
Date: Thursday, 11 October 2018 at 11:50 am
To: Skeeve Stevens <skeeve+ausnog at eintellegonetworks.com>
Cc: "<ausnog at lists.ausnog.net>" <ausnog at lists.ausnog.net>
Subject: Re: [AusNOG] Telstra Insanity?
Hi Skeeve,
As Brad said, that's just ECMP working its multipath magic.
It looks like your network has two connections into Telstra's network (one each off chw-edge901 and ken-edge901), which are of unequal path lengths as seen from the perspective of your local machine (with the last hop on your network on the way to ken-edge901 not shown in the above output).
ECMP combined with a low number of UDP probes (and thus insufficient randomnness to pluck all possible paths out of the woodwork) can lead to extremely confusing ECMP traceroutes.
Try running an ICMP trace instead to get a solid idea of what (one) of your paths is like:
$ sudo traceroute -I 1.1.1.1
Regards,
Benoit Page-Guitard
Network Engineer
Hostopia Australia
Phone: 1300 MY HOST (694 678)
Email: benoit.page at hostopia.com.au<mailto:benoit.page at hostopia.com.au>
Website: https://www.hostopia.com.au/<http://antispam.csu.edu.au:32224/?dmVyPTEuMDAxJiZlZDg4NGQ1OTRlMjRhYzVmMj01QkJFOUU1OV82MzYyN18xNDA3NV8xJiZmNjRhMjUzZGFmNGFmM2U9MTMzMyYmdXJsPWh0dHBzJTNBJTJGJTJGd3d3JTJFaG9zdG9waWElMkVjb20lMkVhdSUyRg==>
On 10 October 2018 at 19:54, Skeeve Stevens <skeeve+ausnog at eintellegonetworks.com<mailto:skeeve+ausnog at eintellegonetworks.com>> wrote:
Hey all,
Does anyone understand this... it hurts my brain.
Skeeve-Faqtory-27:~ skeeve.stevens$ traceroute 1.1.1.1
traceroute to 1.1.1.1 (1.1.1.1), 64 hops max, 52 byte packets
1 x.x.x.10 (x.x.x.10) 0.949 ms 0.615 ms 0.585 ms
2 x.x.x.1 (x.x.x.1) 1.169 ms 1.106 ms 1.022 ms
3 172.18.208.9 (172.18.208.9) 19.487 ms 19.802 ms 19.576 ms
4 172.18.66.197 (172.18.66.197) 20.170 ms
172.18.66.193 (172.18.66.193) 20.538 ms 19.848 ms
5 bundle-ether4.chw-edge901.sydney.telstra.net<http://antispam.csu.edu.au:32224/?dmVyPTEuMDAxJiZmMTk0NWM1YjA5MzBlMDE4Mj01QkJFOUU1OV82MzYyN18xNDA3NV8xJiZmM2ViMDE5ZDVmZWU1N2E9MTMzMyYmdXJsPWh0dHAlM0ElMkYlMkZidW5kbGUtZXRoZXI0JTJFY2h3LWVkZ2U5MDElMkVzeWRuZXklMkV0ZWxzdHJhJTJFbmV0> (203.50.12.108) 20.093 ms 20.163 ms 21.795 ms
6 bundle-ether2.ken-edge901.sydney.telstra.net<http://antispam.csu.edu.au:32224/?dmVyPTEuMDAxJiZmMTk0NWM1YjBmMzBlODE1Mz01QkJFOUU1OV82MzYyN18xNDA3NV8xJiY2M2ViMDE5ZDVmZWU1N2E9MTMzMyYmdXJsPWh0dHAlM0ElMkYlMkZidW5kbGUtZXRoZXIyJTJFa2VuLWVkZ2U5MDElMkVzeWRuZXklMkV0ZWxzdHJhJTJFbmV0> (203.50.11.102) 20.296 ms 19.528 ms
bundle-ether13.chw-core10.sydney.telstra.net<http://antispam.csu.edu.au:32224/?dmVyPTEuMDAxJiZmMTk0NWM1YjBjMmRhZDEzMz01QkJFOUU1OV82MzYyN18xNDA3NV8xJiYwNjRmODFlZGRlOWI5N2I9MTMzMyYmdXJsPWh0dHAlM0ElMkYlMkZidW5kbGUtZXRoZXIxMyUyRWNody1jb3JlMTAlMkVzeWRuZXklMkV0ZWxzdHJhJTJFbmV0> (203.50.11.98) 21.252 ms
7 bundle-ether1.chw-edge902.sydney.telstra.net<http://antispam.csu.edu.au:32224/?dmVyPTEuMDAxJiZmMTk0NWM1YjBjMzBlMDE4Mj01QkJFOUU1OV82MzYyN18xNDA3NV8xJiZmM2ViMDE5ZDVmZWU1N2E9MTMzMyYmdXJsPWh0dHAlM0ElMkYlMkZidW5kbGUtZXRoZXIxJTJFY2h3LWVkZ2U5MDIlMkVzeWRuZXklMkV0ZWxzdHJhJTJFbmV0> (203.50.11.101) 19.891 ms
bundle-ether13.ken-core10.sydney.telstra.net<http://antispam.csu.edu.au:32224/?dmVyPTEuMDAxJiZmMTk0NWM1YjBjMmRhZDFiMz01QkJFOUU1OV82MzYyN18xNDA3NV8xJiZkN2RmODFlZGRlOWI5N2I9MTMzMyYmdXJsPWh0dHAlM0ElMkYlMkZidW5kbGUtZXRoZXIxMyUyRWtlbi1jb3JlMTAlMkVzeWRuZXklMkV0ZWxzdHJhJTJFbmV0> (203.50.11.94) 22.118 ms 21.234 ms
8 bundle-ether2.ken-edge902.sydney.telstra.net<http://antispam.csu.edu.au:32224/?dmVyPTEuMDAxJiZmMTk0NWM1YjBmMzBlODE1Mz01QkJFOUU1OV82MzYyN18xNDA3NV8xJiY2M2ViMDE5ZDVmZWU1N2E9MTMzMyYmdXJsPWh0dHAlM0ElMkYlMkZidW5kbGUtZXRoZXIyJTJFa2VuLWVkZ2U5MDIlMkVzeWRuZXklMkV0ZWxzdHJhJTJFbmV0> (203.50.11.104) 19.428 ms 20.432 ms
bundle-ether1.ken-edge902.sydney.telstra.net<http://antispam.csu.edu.au:32224/?dmVyPTEuMDAxJiZmMTk0NWM1YjBjMzBlODE1Mz01QkJFOUU1OV82MzYyN18xNDA3NV8xJiY2M2ViMDE5ZDVmZWU1N2E9MTMzMyYmdXJsPWh0dHAlM0ElMkYlMkZidW5kbGUtZXRoZXIxJTJFa2VuLWVkZ2U5MDIlMkVzeWRuZXklMkV0ZWxzdHJhJTJFbmV0> (203.50.11.97) 20.719 ms
9 clo2241682.lnk.telstra.net<http://antispam.csu.edu.au:32224/?dmVyPTEuMDAxJiZiZGNlMTc0NTUzNzVhZDA0Mz01QkJFOUU1OV82MzYyN18xNDA3NV8xJiZkN2ZhNjA5YzBmYWYyMjQ9MTMzMyYmdXJsPWh0dHAlM0ElMkYlMkZjbG8yMjQxNjgyJTJFbG5rJTJFdGVsc3RyYSUyRW5ldA==> (144.130.174.50) 20.385 ms 20.533 ms 20.532 ms
10 one.one.one.one (1.1.1.1) 20.224 ms 19.687 ms 19.703 ms
It looks like it going to Chatswood, Kent St and back and forwards. It is odd.
...Skeeve
Skeeve Stevens - Founder & Chief Architect - eintellego Networks Pty Ltd
skeeve at eintellegonetworks.com<mailto:skeeve at eintellegonetworks.com> ; www.eintellegonetworks.com<http://antispam.csu.edu.au:32224/?dmVyPTEuMDAxJiZlMDkwNTU0YzVhNzFlZDE1Mj01QkJFOUU1OV82MzYyN18xNDA3NV8xJiZjNjRiYTBmZDllOGYyMjk9MTMzMyYmdXJsPWh0dHAlM0ElMkYlMkZ3d3clMkVlaW50ZWxsZWdvbmV0d29ya3MlMkVjb20lMkY=>
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