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From: Mick <michaelkintzios@gmail.com>
To: gentoo-user@lists.gentoo.org
Subject: Re: [gentoo-user] [OT] Routing Problems
Date: Sat, 18 Oct 2014 17:37:28 +0100
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References: <5441E251.1090204@alectenharmsel.com> <201410180906.35473.michaelkintzios@gmail.com> <5442898C.8020406@alectenharmsel.com>
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On Saturday 18 Oct 2014 16:38:52 Alec Ten Harmsel wrote:
> On 10/18/2014 04:06 AM, Mick wrote:
> > What do the router logs say?
>=20
> DD-WRT is not very informative. It only has system-type stuff in
> /var/log/messages, nothing LAN-related.
As James suggested, if you have SSH or telnet access to the router run arp =
to=20
see what the arp tables include. Also ping the server from the router to s=
ee=20
if you get any responses. I expect that these will not reveal anything=20
untoward, but it is best to follow a process of elimination a step at a tim=
e.
> > Have you captured any packets on both ends and in between?
>=20
> Capturing packets on my desktop shows strange behavior. When I ping my
> server (kwopper), my desktop (greenbeast) starts generating a bunch of
> ARPs, none of which get answered.=20
Only to state the obvious, that this is not the expected behaviour. Are yo=
u=20
sure that the server firewall isn't configured to only allow connections fr=
om=20
your laptop and/or drop arp packets to avoid arp attacks? What happens whe=
n=20
you disable the firewall?
> When my laptop pings kwopper, the
> first ARP is answered instantly and the pings succeed. Pinging from
> kwopper is the same; instantly finds and connects to my laptop, but my
> desktop does not see any ARPs or ICMPs from kwopper.
Using arpscan and arping between desktop and server you should be able to f=
ind=20
out what is happening, but I suspect something to do with the server=20
configuration.
=2D-=20
Regards,
Mick
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