Dual homed host routing problem

Philip Payne Philip.Payne at uk.uu.net
Thu Mar 27 02:35:46 PST 2003


> I'm running FreeBSD 4.7-RELEASE and I have trouble routing between two
> NIC's. On one side I have a 192.168.1.0/24 network and on the 
> other a 212.110.94.64/27
> network on which I have mail and web servers, which the 192.168.1.0/24
> hosts should be able to reach.
> 
> Here are the ifconfig and netstat -r outputs:
> wb0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>         inet 212.110.94.84 netmask 0xffffffe0 broadcast 212.110.94.95
>         inet6 fe80::280:48ff:feb5:af3%wb0 prefixlen 64 scopeid 0x1 
>         ether 00:80:48:b5:0a:f3
>         media: Ethernet autoselect (100baseTX <full-duplex>)
>         status: active
> rl0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>         inet 192.168.1.1 netmask 0xffffff00 broadcast 192.168.1.255
>         inet6 fe80::202:44ff:fe4f:958e%rl0 prefixlen 64 scopeid 0x2 
>         ether 00:02:44:4f:95:8e
>         media: Ethernet autoselect (10baseT/UTP)
>         status: active
> 
> Routing tables
> Internet:
> Destination        Gateway            Flags    Refs      Use  
> Netif Expire
> default               212.110.94.65      UGSc        4        0    wb0
> localhost             localhost          UH          0        0    lo0
> 192.168.1                 link#2             UC          1    
>     0 rl0
> 192.168.1.255         ff:ff:ff:ff:ff:ff  UHLWb       1       45    rl0
> 212.110.94.64/27   link#1             UC          8        0    wb0
> 
> and I have net.inet.ip.forwarding set to 1
> 
> How do I get my box to route packets between the two 
> interfaces 192.168.1.1
> and 212.110.94.84?

It may not be the actual dual-homed boxes issue. For this to work
completely, the devices on the two networks you mention must also have the
correct routing.

So, devices on 192.168.1.0/24 must have a route for 212.110.94.64/27 via
192.168.1.1... most probably a default route as I assume the devices on
192.168.1.0/24 are reaching the net via this box.

In addition, any device on 212.110.94.64/27 that is supposed to reach
192.168.1.0/24 devices must route 192.186.1.0/24 via 212.110.94.84. 

 


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