If you are running as root, this is the expected behaviour. xscreensaver refuses to start for the root user.
You should have a separate user account anyway, since the root account should only be used for maintainance tasks.
//Daniel
The PREROUTING and POSTROUTING chains do not exist in the filter table (the default). You will have to specify the table to use them (-t nat).
//Daniel
With Slackware, you'll have to download every package yourself. However, I think there is a script called swaret (not sure as I've never liked Slack) which will automate it for you.
//Daniel
Simply configuring the kernel and going to Device drivers -> Networking support -> Networking options and selecting Help on the "Network packet filtering (replaces ipchains)" would have told you it was using Netfilter.
//Daniel
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