Using Fedora as firewall.

[Luciano Miguel Ferreira Rocha]

On Sat, Apr 17, 2004 at 09:56:21AM +0000, david_pettersson at bredband.net wrote:
> 
> Hi,
> 
> Before my old computer burned I used it as a firewall or gateway to the internet. Then I had a modem and a networking card and everything worked.
> 
> Now I have two networking cards, one buildin in the motherboard (eth0) and one in a PCI slot (eth1). When I tried to do the same to give my WinXP box access to the internet I couldn't get it right. When I connect to internet using eth0 everything is fine. When I start eth1 to the WinXP box it works, but then I have no contact with the internet thru eth0.
> To get contact with the internet again I have to stop eth1 and restart eth0. Does anyone have a clue?
> 
> The internet company used DNS to assign network adresses and the WinXP has adress 172.16.0.2
> /sbin/ipconfig gives:
> 
> eth0 Link encap:Ethernet HWaddr 00:0E:A6:38:BC:53
> inet addr:213.114.28.238 Bcast:213.114.28.255 Mask:255.255.255.128
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:3820 errors:0 dropped:0 overruns:0 frame:0
> TX packets:6080 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:1000
> RX bytes:1871476 (1.7 Mb) TX bytes:840285 (820.5Kb)
> Interrupt:10 Base address:0x7800
> 
> eth1 Link encap:Ethernet HWaddr 00:30:4F:1E:0B:2A
> inet addr:172.16.0.1 Bcast:172.16.0.255 Mask:255.255.255.0
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:10 errors:0 dropped:0 overruns:0 frame:0
> TX packets:248 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:1000
> RX bytes:759 (759.0 b) TX bytes:30639 (29.9 Kb)
> Interrupt:11 Base address:0x1000
> 
> lo Link encap:Local Loopback
> inet addr:127.0.0.1 Mask:255.0.0.0
> UP LOOPBACK RUNNING MTU:16436 Metric:1
> RX packets:2460 errors:0 dropped:0 overruns:0 frame:0
> TX packets:2460 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:0
> RX bytes:1943908 (1.8 Mb) TX bytes:1943908 (1.8 Mb)
> 

Either the dhcp client for your company overwrites the /etc/resolv.conf
file for name resolution, or it's adding/replacing the default route for
the internet.

Check the file /etc/resolv.conf and report the output of /sbin/route -n,
please.

Regards,
Luciano Rocha

-- 
Consciousness: that annoying time between naps.