[167644] in North American Network Operators' Group
Re: Help me make sense of these traceroutes please
daemon@ATHENA.MIT.EDU (Jimmy Hess)
Wed Dec 25 10:28:46 2013
In-Reply-To: <F02A0931E2E6254680832D6A24940C2D0C467D26@hx01.srv.hotze.com>
Date: Wed, 25 Dec 2013 09:28:28 -0600
From: Jimmy Hess <mysidia@gmail.com>
To: Martin Hotze <m.hotze@hotze.com>
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Wed, Dec 25, 2013 at 8:03 AM, Martin Hotze <m.hotze@hotze.com> wrote:
>
> > On 2013-12-25 00:16, Sam Moats wrote:
>
...
> > You are likely seeing the effects of asymmetric routing.
> . .. or the effect of passing traffic through NSA infrastructure.
>
>
Ah... NSA. That's probably it.
So much for my theory of a Router virtual chassis straddling the atlantic.
or the extra kinetic energy carried by the overseas-bound packet took
longer for the router to absorb and rebound with an ICMP.
But in all seriousness --- what is probably happening here, is the result
of extra "hops" that don't show up in traceroute.
MPLS tunnels could well fit the bill.
Other things to consider when latency seems sensitive to destination IP ---
are preceding device in the traceroute might also have multiple links to
the same device; with one link congested and some form of IP-based load
sharing, that happens to be the toward-overseas link.
> SCNR, #m
--
-JH
