Date: Fri, 13 Oct 2000 16:42:31 -0400 From: Bill Fumerola <billf@chimesnet.com> To: Gerhard Sittig <Gerhard.Sittig@gmx.net> Cc: freebsd-security@FreeBSD.ORG Subject: Re: Dynamic rc.firewall Message-ID: <20001013164231.S37870@jade.chc-chimes.com> In-Reply-To: <20001013191623.C25237@speedy.gsinet>; from Gerhard.Sittig@gmx.net on Fri, Oct 13, 2000 at 07:16:23PM %2B0200 References: <5.0.0.25.2.20001013032255.00a8ee40@127.0.0.1> <20001013191623.C25237@speedy.gsinet>
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On Fri, Oct 13, 2000 at 07:16:23PM +0200, Gerhard Sittig wrote:
> > How can I have rc.firewall automatically pull in ip, netmask
> > and network numbers from the currently configured interfaces.
> >
> > Lets say I was to supply 'xl0' and have it extract the
> > information from ifconfig. I started a perl program, but I
> > don't have enough documentation available at the moment to
> > actually extract the data from what is returned.
>
> I don't know whether ipfw has a similar "alias", but in ipf
> (which is available in FreeBSD, too) you can specify address
> 0.0.0.0/32 in your rules when you mean "my current address on
> this interface". Just make sure to issue "ipf -y" whenever the
> interface address changes (ppp.linkup or the appropriate dhcp
> client hook).
< /home/billf # ipfw sh
00010 4 336 count ip from any to any via lo0
00020 4 336 count ip from any to any via 127.0.0.1
65535 1394368 292507478 allow ip from any to any
Granted you can't just use this anywhere, but ipfw allows for a
preprocessor.
--
Bill Fumerola - Network Architect, BOFH / Chimes, Inc.
billf@chimesnet.com / billf@FreeBSD.org
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