Get ipfwadm from ftp.xos.nl:/pub/linux/ipfwadm (take version 2.0beta2
for kernels 1.3.66 and above!) and issue the command:
ipfwadm -F -a masq -S 192.168.0.0/24 -D 0.0.0.0/0
-- -- Jos Vos <jos@xos.nl> -- X/OS Experts in Open Systems BV | Phone: +31 20 6938364 -- Amsterdam, The Netherlands | Fax: +31 20 6948204