IPFILTER rules with shell symbloic substitution

[Roman Neuhauser]

# dnelson at allantgroup.com / 2003-11-26 12:13:53 -0600:
> In the last episode (Nov 26), fbsd_user said:
> > Looking for way to code IPFILTER rules with shell symbolic
> > substitution. I know how to do it in the rules, but how to get ipf
> > pgm to exec in shell? Any body have example of how to setup this?
> 
> /etc/rc.firewall has lots of examples using ipfw; the concepts should
> work just as well with ipf.

    that won't work with ipf, but: you can have the rules passed through
    /bin/sh (which would do the substitutions), and piped into ipf.

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