[TriLUG] Newbie: help needed with building linux firewall

Jon Carnes jonc at nc.rr.com
Fri Mar 8 11:26:33 EST 2002


When all the interfaces are loaded, what does "ifconfig" show?  

Instead of using ip addressing that is on one subnet, how about trying 
ip_addresses from three different subnets for each of the interfaces:
  192.168.1.0 / 255.255.255.0
  192.168.2.0 / 255.255.255.0
  192.168.3.0 / 255.255.255.0

 --- Original Message: Friday 08 March 2002 10:23 am ---
> > Have you loaded the modules for each network card?  and configured the
> > interfaces so that they load.  Can you ping each interface (externally
>
> and
>
> > internally)?
>
> Jon,
>
> I'm slightly familiar with what Tim is doing, so let me see if I can help
> explain.
>
> He's trying to build a linux firewall ( no NAT / masquerading,
>  that's handled by the router provided by the ISP ).  Routing is
> turned on, but right now it doesn't appear to be routing anything.
>
> One problem he's had, that's made it difficult to diagnose problems, is
> the thing with the interfaces behaving weirdly, that he was describing in
> this first e-mail.  He has three NIC's, (all with the modules loaded
> appropriately)
> assigned as eth0, eth1, and eth2.  They each have an address, like
> 10.0.0.3, 10.0.0.4,
> and 10.0.0.5.  Strangely enough though, you can down eth1 and eth2, but
> eth0 still
> responds to ping requests sent to 10.0.0.3, 10.0.0.3, or 10.0.0.5.
>
> I think he wants to figure out why that's happening, as a first step to
> getting
> this thing straightened out....
>
> TTYL,
>
> Phillip Rhodes
> Application Designer
> Voice Data Solutions
> 919-571-4300 x225
>
>
>
>
>
>
>
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