nanog mailing list archives

Re: Help interpret a strange traceroute?

From: William Herrin <bill () herrin us>
Date: Mon, 31 Oct 2016 15:42:33 -0400

On Mon, Oct 31, 2016 at 3:33 PM, Randy <amps () djlab com> wrote:

Any idea how a traceroute (into my network) could end up this fubar'd?
Discovered this wierd routing while investigating horrendously slow speeds
(albeit no packet loss) to a particular ISP abroad.


Hi Randy,

This is per-packet load balancing. In the forward path the alternates
are different lengths but the traceroute stops as soon as at least one
of the paths reaches the destination.

The return path is also engaged in per-packet load balancing but the
paths are all the same length.

Regards,
Bill Herrin


-- 
William Herrin ................ herrin () dirtside com  bill () herrin us
Owner, Dirtside Systems ......... Web: <http://www.dirtside.com/>

Current thread:

Help interpret a strange traceroute? Randy (Oct 31)
- Re: Help interpret a strange traceroute? William Herrin (Oct 31)
  - Re: Help interpret a strange traceroute? Olivier Benghozi (Oct 31)
    - Re: Help interpret a strange traceroute? Bryan Holloway (Oct 31)
    - Network Maps - Western Europe Rod Beck (Oct 31)
- Message not available
  - Re: Help interpret a strange traceroute? Larry Sheldon (Oct 31)