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-boun...@lists.ausnog.net> on behalf of Benoit Page-Guitard <benoit.p...@hostopia.com.au> Date: Thursday, 11 October 2018 at 11:50 am To: Skeeve Stevens <skeeve+aus...@eintellegonetworks.com> Cc: "<ausnog@lists.ausnog.net>" <ausnog@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.p...@hostopia.com.au<mailto:benoit.p...@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+aus...@eintellegonetworks.com<mailto:skeeve+aus...@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 ske...@eintellegonetworks.com<mailto:ske...@eintellegonetworks.com> ; www.eintellegonetworks.com<http://antispam.csu.edu.au:32224/?dmVyPTEuMDAxJiZlMDkwNTU0YzVhNzFlZDE1Mj01QkJFOUU1OV82MzYyN18xNDA3NV8xJiZjNjRiYTBmZDllOGYyMjk9MTMzMyYmdXJsPWh0dHAlM0ElMkYlMkZ3d3clMkVlaW50ZWxsZWdvbmV0d29ya3MlMkVjb20lMkY=> Phone: 1300 239 038; Cell +61 (0)414 753 383 ; skype://skeeve facebook.com/eintellegonetworks<http://antispam.csu.edu.au:32224/?dmVyPTEuMDAxJiZhYjlmNTY0NDEyN2JlYTFlMj01QkJFOUU1OV82MzYyN18xNDA3NV8xJiZjNzZiOTExZDdmY2IzMjQ9MTMzMyYmdXJsPWh0dHAlM0ElMkYlMkZmYWNlYm9vayUyRWNvbSUyRmVpbnRlbGxlZ29uZXR3b3Jrcw==> ; linkedin.com/in/skeeve<http://antispam.csu.edu.au:32224/?dmVyPTEuMDAxJiZlZDg4NGQ1OTA3MzFhYzFjMz01QkJFOUU1OV82MzYyN18xNDA3NV8xJiYxN2RiZTE4ZDZmMmIyNjQ9MTMzMyYmdXJsPWh0dHAlM0ElMkYlMkZsaW5rZWRpbiUyRWNvbSUyRmluJTJGc2tlZXZl> Cumulus Linux / Open Networking - Cloud - Consulting - Juniper - Cisco - IPv4 Brokering _______________________________________________ AusNOG mailing list AusNOG@lists.ausnog.net<mailto:AusNOG@lists.ausnog.net> http://lists.ausnog.net/mailman/listinfo/ausnog<http://antispam.csu.edu.au:32224/?dmVyPTEuMDAxJiZmNjkyNTY0ZTEzNzBlNjA0Nz01QkJFOUU1OV82MzYyN18xNDA3NV8xJiY3N2ViNDE0ZGVmNmJkMjQ9MTMzMyYmdXJsPWh0dHAlM0ElMkYlMkZsaXN0cyUyRWF1c25vZyUyRW5ldCUyRm1haWxtYW4lMkZsaXN0aW5mbyUyRmF1c25vZw==> _______________________________________________ AusNOG mailing list AusNOG@lists.ausnog.net http://lists.ausnog.net/mailman/listinfo/ausnog
