Eduardo Gargiulo wrote:

> Hi all.
> 
> I have a linux box running ipchains and masquerading my inetrnal network.
> I have subnet of real IP. The router is connected to the hub so the REAL subnet is 
>before the firewall, so I can't protect it. I'm thinking in add an eth to the linux 
>box and connect the router (with a cross UTP) to eth0, and connect eth1 (with real 
>IP) and eth2 (with masqued IP) to the hub. The question is how configure ipchains and 
>if it is possible to work or I have to add another tool to my linux box to handle 
>this configuration?


Hi all,

My configuration is:

ISP-Cable
  |(xxx.xxx.xxx.129 ip)
  \
   \(xxx.xxx.xxx.130 ip)
   LINUX-(xxx.xxx.xxx.132 ip)---------------------\
    |(192.168.1.1_ip)                             |
    |                                             |(xxx.xxx.xxx.131 ip)
    |----(192.168.1.2 ip                          this host uses downstream
    |-----(192.168.1.3 ip)
    .
    .
    .
    \------(192.168.1.n ip)

Linux has 3 interfaces
   eth0 xxx.xxx.xxx.130
   eth1 xxx.xxx.xxx.131
   eth2 192.168.1.1

hosts in 192.168.1.0/255.255.255.0 are masquaraded

   #ipchains -A forward -s 192.168.1.0/255.255.255.0 -j MASQ

eth0 and eth1 are bridged

   #ipchains -A bridgein -s xxx.xxx.xxx.131 -i eth1 -j ACCEPT
   #ipchains -A bridgein -d xxx.xxx.xxx.131 -i eth1 -j ACCEPT
   bridgein chain comes from patch

default route set to xxx.xxx.xx.129

It should work just ok.
But it makes a booo ones for a while.

i thing it is doing something like that:
packets that should be masquaraded are bridged.
How to prevent from this.

Second Q:
   why normal forwarding wasn't working, why have i had to use a bridge

Thanks,
   Hubert.


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