Strange routing table (solved).
Erik P. Olsen
erik at epo.dk
Thu Mar 16 20:50:43 UTC 2006
Gordon Messmer wrote:
> Erik P. Olsen wrote:
>
>> My main box is an FC3 linux box wire coupled to a Linksys router
>> WRT54G. I have two laptops wireless coupled to the router. One laptop
>> runs Windows 2000 the other Windows XP. The laptops can ping all boxes
>> but the linux box can't ping the laptops.
>
>
>
> Is your router assigning IPs from the same network to both the Linux
> host and the wireless-attached hosts? If so, you can use tcpdump
> (install it if you need to) and make sure that the Windows hosts are
> responding to ARP requests.
>
> As an example, if I want to observe the arp and ping to 172.20.111.6
> from my workstation (wanderlust), I might use this command:
>
> # tcpdump arp or host 172.20.111.6
>
> I could be more specific, but that will work. Now, if I ping that host
> in another terminal, I see these three lines printed from tcpdump:
>
> 14:29:47.317821 arp who-has 172.20.111.6 tell wanderlust
> 14:29:47.317975 arp reply 172.20.111.6 is-at 00:11:11:74:ca:7b
> 14:29:47.317986 IP wanderlust > 172.20.111.6: icmp 64: echo request seq 0
>
> The first two are examples of what you should see. If you ping another
> host in the same IP network, your workstation should request the MAC
> address of the remote host. If it doesn't reply, it's possible that
> your router isn't bridging broadcast traffic between the wired and
> wireless attached networks. If *that* is the case, the best solution is
> to configure the router to assign different IP networks to hosts in each
> of the wired and wireless attached nets.
>
Thanks for all your help. I have now found the reason to my problems. Being a
newbie I wasn't aware that the iptables running on my linux box actually IS a
firewall and that it blocked any connect attempt from outside (blush). When I
opened for the port in question to tcp everything performed normally. It took me
many days of agony before I realised what it was, sigh.
Again, thanks a lot.
--
Regards,
Erik P. Olsen
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