Linux IP Masquerade HOWTO
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7.22. ( SETSOCKOPT ) - I'm getting "ipfwadm: setsockopt failed: Protocol not available" when I try to use IPPORTFW!

If you get the error message "ipfwadm: setsockopt failed: Protocol not available", you AREN'T running your new kernel. Make sure that you moved the new kernel over, re-run LILO, and then reboot again.

Please see the end of Section 6.7 for full details.

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( Free Ports ) - I'm getting "kernel: ip_masq_new(proto=UDP): no free ports." in my SYSLOG files. Whats up?Up( SAMBA ) - Microsoft File and Print Sharing and Microsoft Domain clients don't work through IP Masq! To properly support Microsoft's SMB protocol, an IP Masq module would need to be written but there are three viable work-arounds. For more details, please see this Microsoft KnowledgeBase article.