networking, ip masquerading and firewall

[buttercrunch]

hi, can anyone help me please?

I am trying to set up a two interface networking with Mandrake 9.1 as router,firewall and ip masqureading.

Here's whats going on:

The server:
1. Can connect to internet
2. Have two ethernet cards
3. Can ping internal network computers
4. have masquerading by dhcp working (seems to be) okay.

My Internal Boxes
1. Cannot ping the server (why i dont know)
2. Cannot connect to internet

Can anyone identify what's going on?
If anymore detail is required i will be ready to add more.
thanks in advance :)

[homey]

When you say "Cannot ping the server (why i dont know) "
Do you mean that they can't ping the IP address of the server or can't ping the Name of the server?