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Date:      Mon, 28 Nov 2011 14:15:44 +0100
From:      Kees Jan Koster <>
Subject:   diagnosing packetloss: x-files edition
Message-ID:  <>

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The packet loss I asked about earlier is getting weirder and weirder. I =
managed to track this down to being between two specific hosts =

When I run mtr from saffron to cumin I get packet loss reported on all =
intermediate routers. When I run mtr from cumin to saffron I get packet =
loss reported only on the end hop to saffron.=20

But (and here it gets weird) when I run mtr from saffron to any other =
host on the Internet (although I have not tried exhaustively) I get *no* =
packet loss at all.

So what I expect now is that this is a hardware issue with the NIC in =
Saffron that only affects the traffic going to cumin and not traffic to =
any other host.

I will swap the NIC in saffron, but I just wanted to check:

* can this be caused by the fact that I use fwd rules in ipfw? Both =
Saffron and Cumin have such  rule.
* Can this be caused by IP aliassing? With Saffron and cumin use two IP =
addresses on their NIC.
* Anything else?
Kees Jan

I hate unit tests; I much prefer the illusion that there are no errors =
in my code.
                                                                 -- =
Hendrik Muller

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