Network Purgatory (Was network hell)

Hi, I've been downgraded in my suffering. I'd really like to figure this out and am thankful for all the help so far. Here's where I am. I have three machines on the network; the internet server (Suse 7.2 with masq services), a win2k machine and the Suse 8.0 notebook. All machines have internet access. The W2K and Suse 8 notebook can obviously therefore see the gateway. They cannot, however, see one another. I tried from the w2k box to ping the 8.0 notebook. Nada. The reverse was the same. Both machines can ping the gateway or I'd go incredibly nuts right this second. Can anyone offer some assistance? I'm frantic. Nick