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firewall setup - firewall newbie

> Hi there,
> While I'm not new to firewalling or linux, I am new to linux 
> firewalling.  This would be my first dual nic card, that I've 
> setup.  So far I've setup a woody box w/ 2 network cards in 
> it.  I kind of have the 2 cards working, but I think I may be 
> missing something basic right now...
> ifconfig show both cards up and running.  I can ping both 
> cards from the local console.  I can ping eth0 externally.  I 
> can't ping eth1 externally.  I've got it plugged into a hub 
> with another computer and the other machine is IP'd 
> correctly.  I'm also not getting a link light on the hub for eth1.
> # ifconfig -a
> eth0      Link encap:Ethernet  HWaddr 00:60:08:35:05:0C  
>           inet addr:  Bcast:  Mask:
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:5402465 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:3331 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:38 txqueuelen:100 
>           RX bytes:549424583 (523.9 MiB)  TX bytes:274368 (267.9 KiB)
>           Interrupt:5 Base address:0x220 
> eth1      Link encap:Ethernet  HWaddr 00:20:AF:99:98:2A  
>           inet addr:  Bcast:  
> Mask:
>           BROADCAST MULTICAST  MTU:1500  Metric:1
>           RX packets:0 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:100 
>           RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)
>           Interrupt:5 Base address:0x300 
> Both cards are 3com 3c509 in case there's inherent problems 
> with that...  This is the 2nd eth1 I've put in as I first 
> suspected a potentially bad card.  Now I'm not sure if it's a 
> hardware issue.
> Any suggestions?
> Thanks.
> -- 
> Edward Chase
> Providence College
> Information Technology 

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