How can I have NAT or a firewall on Solaris?

There are several NAT and firewall solutions.

Sun has recently made SunScreen lite available for free from
Sun's home page and as part of Solaris 8.

Solaris 9 ships with the full edition of SunScreen 3.2.

Alternatively, there's Darren Reed's ipfilter package.

Ipfilter is the default firewall for Solaris 10.

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