Gentoo Archives: gentoo-user

From: Mick <michaelkintzios@×××××.com>
To: gentoo-user@l.g.o
Subject: Re: [gentoo-user] [OT] Routing Problems
Date: Sat, 18 Oct 2014 16:38:24
In Reply to: Re: [gentoo-user] [OT] Routing Problems by Alec Ten Harmsel
1 On Saturday 18 Oct 2014 16:38:52 Alec Ten Harmsel wrote:
2 > On 10/18/2014 04:06 AM, Mick wrote:
4 > > What do the router logs say?
5 >
6 > DD-WRT is not very informative. It only has system-type stuff in
7 > /var/log/messages, nothing LAN-related.
9 As James suggested, if you have SSH or telnet access to the router run arp to
10 see what the arp tables include. Also ping the server from the router to see
11 if you get any responses. I expect that these will not reveal anything
12 untoward, but it is best to follow a process of elimination a step at a time.
15 > > Have you captured any packets on both ends and in between?
16 >
17 > Capturing packets on my desktop shows strange behavior. When I ping my
18 > server (kwopper), my desktop (greenbeast) starts generating a bunch of
19 > ARPs, none of which get answered.
21 Only to state the obvious, that this is not the expected behaviour. Are you
22 sure that the server firewall isn't configured to only allow connections from
23 your laptop and/or drop arp packets to avoid arp attacks? What happens when
24 you disable the firewall?
27 > When my laptop pings kwopper, the
28 > first ARP is answered instantly and the pings succeed. Pinging from
29 > kwopper is the same; instantly finds and connects to my laptop, but my
30 > desktop does not see any ARPs or ICMPs from kwopper.
32 Using arpscan and arping between desktop and server you should be able to find
33 out what is happening, but I suspect something to do with the server
34 configuration.
36 --
37 Regards,
38 Mick


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Subject Author
Re: [gentoo-user] [OT] Routing Problems Alec Ten Harmsel <alec@××××××××××××××.com>