Why the network is unreable?

Rob Sterenborg rob at sterenborg.info
Sun Nov 5 19:05:25 CET 2006


> Hi:
>     My network is like this:
>     A(IP:192.168.0.2)          B(IP: 192.168.0.1)(IP:192.168.1.2)
>      C(IP:192.168.1.1) (netmask:255.255.255.0)     255.255.255.0    
>      255.255.255.0 255.255.255.0 (gw: 192.168.0.1)            gw :
> 192.168.1.1 

I'm not sure what you mean because of wrapping.
You mean this?

A(IP: 192.168.0.2)
 (NM: 255.255.255.0)
 (GW: 192.168.0.1)

B(IP: 192.168.0.1)   (IP: 192.168.1.2)
 (NM: 255.255.255.0) (NM: 255.255.255.0)

C(IP: 192.168.1.1)
 (NM: 255.255.255.0)
 (GW: 192.168.1.1)

You should change the GW of C into 192.168.1.2.
C does not know the route to 192.168.0.2; B does.

>    B is a machine with 2 network cards .
>    At first I enable the /proc/sys/net/ipv4/ip_forward and
> set the default gw 192.168.1.1.
>     Now, A ping B is ok and B ping C is ok. But when A ping C the
> network is unreachable.
>    I don't know why. Please help me.


Gr,
Rob




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