Date: Wed, 8 May 2024 21:14:27 +0100 From: Lexi Winter <lexi@le-fay.org> To: Dirk-Willem van Gulik <dirkx@webweaving.org> Cc: FreeBSD Hackers <freebsd-hackers@freebsd.org> Subject: Re: IPv6 and IPv4 combined rules in pf.conf Message-ID: <ZjvdI2LzAYEIMjCy@ilythia.eden.le-fay.org> In-Reply-To: <0C18B410-E90B-4295-B09E-43B48F9191A4@webweaving.org> References: <0C18B410-E90B-4295-B09E-43B48F9191A4@webweaving.org>
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Dirk-Willem van Gulik:
> For dual stack hosts; with both an IPv4 and IPv6 CIDR that they are
> listening to - is there a recommended way to setup pf.conf to avoid
> mistakes/duplication ?
> To avoid duplication in constructs such as:
> # Foo app servers
> foobarserver_host4=231.17.X.Y
> foobarserver_host6=fe80::5246:…
>
> # Load balancers - direct or via tun0 in post/fail-back
> bar_net=X.Y.Z.Z #
> bar_net6=fe80::5246:… #
> …
>
> pass in on { tun0, $ext_if } proto udp from $bar_net to $foobarserver_host4 port 2194 keep state
> pass in on { tun0, $ext_if } proto udp6 from bar_net6 $var to $foobarserver_host6 port 2194 keep state
> Is there some recommended way of doing this in stock FreeBSD ? Or does
> one usually end up with some sort of macro/generate style solution ?
i would suggest something like this:
table <foobarserver> {
231.17.X.Y
fe80::5246:...
}
table <bar-net> {
...
}
pass on { tun0, $ext_if } proto udp from <bar-net> \
to <foobarserver> port 2194
alternatively, if 'foobarserver' is the local host, you can simply do:
pass in on { tun0, $ext_if } proto udp from <bar-net> \
to self port 2194
note that in either case pf doesn't need 'keep state'.
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