That was it, Ray. Thank you! Obviously I have much yet to learn about 
networking.

Warren

Ray Olszewski wrote:

> Your problem is in the routing table on the firewall box. See below for 
> details.
> 
> At 11:52 AM 9/17/02 -0600, Warren Post wrote:
> 
>> I'm trying to set up Dachstein to sit between our LAN and our ISP. I 
>> can ping the loopback and everything in the LAN from the firewall box, 
>> but I cannot ping the external gateway nor anything else outside the 
>> LAN. The LEAF ping FAQ suggest that my firewalling rules need to be 
>> tweaked, but being new to firewalling and to Linux I need guidance. 
>> The details:
> 
> [...]
> 
>> ip route show reports:
>>
>> 65.167.30.96/27 dev eth0  proto kernel  scope link  src 65.167.30.126
>> 192.168.0.0/24 dev eth1  proto kernel  scope link  src 192.168.0.3
>>
>> ping 65.167.30.174 from the firewall reports:
>>
>> ping: sendto: Network is unreachable
> 
> 
> Believe what sendto is telling you: that no network containing IP 
> address 65.167.30.174 is reachable. The host has no default route, you 
> will note, and network 65.167.30.96/27 only covers the address range .96 
> to .127 . QED.
> 
> The easy quick fix is to change the netmask on the eth0 IP address from 
> /27 to /24. If that works -- by which I mean that the default route is 
> now installed and you can ping both the gateway and beyond it -- then 
> all that is left is for you to discuss with your ISP what 
> address/netmask you should be using (something no one here can guess; 
> all we can do is note that some combinations, such as the one you are 
> trying to use, will not work).
> 
> If this does not fix it, then send an updated trouble report. (Once I 
> saw the routing-table problem, I did not examine the firewall ruleset 
> you posted, so I don't know if it too has problems.)




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