Re: networking problem

On Tue, 25 Apr 2006 20:20:29 -0400, noEMA wrote:

On Tue, 25 Apr 2006 14:03:39 +0000, Beef wrote:

I have two computers. Sheaf (192.168.0.2) runs Mandriva 2006, Porter
(192.168.0.3) runs Ubuntu 5.10.

They are connected to a NetGear Wireless ADSL router (model DG834G)
(192.168.0.3), by ethernet cables.

I can ping from sheaf to porter, but not from porter back to sheaf.

Both machines can go through the router to the internet.

Here are the routing tables:

root@porter:~# netstat -rn
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt
Iface 192.168.0.0 0.0.0.0 255.255.255.0 U 0 0
0 eth0 0.0.0.0 192.168.0.1 0.0.0.0 UG 0 0
0 eth0 (netstat on porter doesn't list lo, but the interface is
configured OK)

[root@sheaf ~]# netstat -rn
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt
Iface 192.168.0.0 0.0.0.0 255.255.255.0 U 0 0
0 eth1 127.0.0.0 0.0.0.0 255.0.0.0 U 0 0
0 lo 0.0.0.0 192.168.0.1 0.0.0.0 UG 0 0
0 eth1


I spent hours looking for traceroute on Ubuntu, before finding tracepath:

[root@sheaf ~]# tracepath porter
1: 192.168.0.2 (192.168.0.2) 0.348ms pmtu
1500 1: porter (192.168.0.3) 0.590ms
reached
Resume: pmtu 1500 hops 1 back 1

root@porter:~# tracepath sheaf
1: 192.168.0.3 (192.168.0.3) 0.437ms pmtu
1500 1: no reply
2: no reply
3: no reply

I think that the problem is with routing through the router, not really on
the computers themselves.

I tried creating static routes on the router from one machine to the
other, and this changed nothing.

Can anybody explain to me what is wrong, so I can fix it, please?


Beef.

Hi.

1 ) If I read your text correctly, you wrote that the DSL router address
is at 192.168.0.3.
But the routing table of both hosts are configured to go to 192.168.0.1.
I'll assume that it's only a typing mistake and your router is indeed
configured as 192.168.0.1.

You're right, a typing error in my post.

Got it sorted, thanks to another reply. Shorewall on Sheaf was dropping
packets.

You post was informative, though. Thanks for your advice.

Beef.

.

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