Future of pf / firewall in FreeBSD ? - does it have one ?

sthaug at nethelp.no sthaug at nethelp.no
Mon Jul 21 06:57:34 UTC 2014

> > > Also, the openbsd stack has some essential features missing in freebsd,
> > > like mpls and md5 auth for bgp sessions.
> >
> > I use MD5 auth for BGP sessions every day (and have been doing so for
> > several releases). One could definitely wish for better integration -
> > having to specify MD5 key both in /etc/ipsec.conf and in the Quagga
> > bgpd config is not nice. But it works.
> >
> As far as I know you can only send out correctly authed stuff but not
> validate incoming. Has that changed?

Have a look at tcp_signature_verify(), called from tcp_input.c. Added
in r221023, see


Steinar Haug, Nethelp consulting, sthaug at nethelp.no


Revision 221023 - (view) (download) (annotate) - [select for diffs] 
Modified Mon Apr 25 17:13:40 2011 UTC (3 years, 2 months ago) by attilio 
File length: 106717 byte(s) 
Diff to previous 220560
Add the possibility to verify MD5 hash of incoming TCP packets.
As long as this is a costy function, even when compiled in (along with
the option TCP_SIGNATURE), it can be disabled via the
net.inet.tcp.signature_verify_input sysctl.

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