Very Computer

Problem with networking - I am using RedHat 9 Linux kernel 2.4

I have the following environment:

A NetGADSL router IP address 192.168.0.100. Attached to this is my Linux
server which is dual homed. One nic is attached to the ADSL router - this
is the eth0 interface, ip address 192.168.0.22. This interface has the
NetGear router set as the default gateway address. The other nic - eth1 -
has an ip address of 10.0.0.1 and this is attached to an 8 port switch.
Connected to the 8 port switch is another machine running Microsoft
Windows XP Professional with an ip address of 10.0.0.23. It has a default
gateway set to be 10.0.0.1.

I only have one static IP address. The NetGear router is set up for NAT.
The Linux server is also set up as being in the DMZ of the NetGear router.
This only has the effect of passing all requests to the Linux server and
not dropping them.

On the Linux server I have stopped the IPTABLES service so as not to
complicate matters further and I have enabled IP forwarding. I have also
enabled and configured the web proxy Squid.

My linux server can ping the ADSL hub on 192.168.0.100, it can ping the
machine 10.0.0.23 and it can ping any valid address on the internet.

My XP machine - 10.0.0.23 - can ping the server on either of its
interfaces and it can ping the ADSL hub - proof that the server is
forwarding IP packets. I can also browse the web from 10.0.0.23 via the
Squid proxy.

However, I cannot ping any address on the internet.

I was wondering if I needed to implement IP Masquerading but thought that
the NAT on the NetGear hub should be sufficient.

Can anyone please shed any light on what I need to do to get the Windows
machine to be able to communicate to the internet via the server.

Thanks in advance

Graham Jones

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Quote:

> I have the following environment:

> A NetGADSL router IP address 192.168.0.100. Attached to this is my
> Linux server which is dual homed. One nic is attached to the ADSL
> router - this is the eth0 interface, ip address 192.168.0.22. This
> interface has the NetGear router set as the default gateway address.
> The other nic - eth1 - has an ip address of 10.0.0.1 and this is
> attached to an 8 port switch. Connected to the 8 port switch is
> another machine running Microsoft Windows XP Professional with an ip
> address of 10.0.0.23. It has a default gateway set to be 10.0.0.1.

> I only have one static IP address. The NetGear router is set up for
> NAT. The Linux server is also set up as being in the DMZ of the
> NetGear router. This only has the effect of passing all requests to
> the Linux server and not dropping them.

> On the Linux server I have stopped the IPTABLES service so as not to
> complicate matters further and I have enabled IP forwarding. I have
> also enabled and configured the web proxy Squid.

> My linux server can ping the ADSL hub on 192.168.0.100, it can ping
> the machine 10.0.0.23 and it can ping any valid address on the
> internet.

> My XP machine - 10.0.0.23 - can ping the server on either of its
> interfaces and it can ping the ADSL hub - proof that the server is
> forwarding IP packets. I can also browse the web from 10.0.0.23 via
> the Squid proxy.

> However, I cannot ping any address on the internet.

>[...]

May be the router doesn't know the 10.0.0 network. Have you configured a
static route to that subnet?
Try to ping an Internet address from the server setting eth1 like the
source interface (ping -I interface_name). If your problem is the private
network, ping will fail.

Regards.