[Techtalk] re: DNS and IP Masq

[Berenice]

Malcolm wrote:

>If forwarding is turned on, do you have any IP tables rules that are
>stopping the data from flowing (e.g. a default DENY rule in the
>forward chain)?
>
>Failing all of this, can you post some more details, such as the IP
>addresses of the machines involved, the routing table on your
machine
>(and relevant iptables rules)? Often these problems are easy to spot
>when we can stare at the raw information a bit.

Hi Malcolm,

IP forwarding is on, and I've turned off the iptables firewall script
since this problem was occurring before I installed the script. I
didn't set any iptables rules before that.   I suspect the problem
lies in how the routing was set up. 

We have a dialup internet connection and the modem is configured to
automatically obtain DNS information from the provider.

My machine is the host and its adddress is 192.168.0.1.  
Network address: 192.168.0.0
Broadcast address: 192.168.0.255
Subnet mask: 255.255.255.0

My sister's address is 192.168.0.1 and her gateway is 192.168.0.1

Here's the routing table info (sorry it's wrapped):

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref   
Use Iface
139.134.99.179  0.0.0.0         255.255.255.255 UH    0      0       
0 ppp0

192.168.0.0     0.0.0.0         255.255.255.0   U     0      0       
0 eth0

127.0.0.0       0.0.0.0         255.0.0.0       U     0      0       
0 lo

0.0.0.0         139.134.99.179  0.0.0.0         UG    0      0       
0 ppp0


I don't fully understand how routing works, so please bear with me if
there are embarrassingly obvious mistakes :)

cheers

Berenice



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