Date: Sun, 11 Apr 1999 14:58:31 +0100 From: Brian Somers <brian@Awfulhak.org> To: Christopher Michaels <ChrisMic@clientlogic.com> Cc: "FreeBSD Mailing List (E-mail)" <questions@FreeBSD.ORG> Subject: Re: IPFW filtering on a dynamic linkup. Message-ID: <199904111358.OAA62305@keep.lan.Awfulhak.org> In-Reply-To: Your message of "Sun, 11 Apr 1999 01:48:17 EDT." <6C37EE640B78D2118D2F00A0C90FCB441A605C@site2s1>
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You can kick off a script when your link comes up, passing it the IP
address and interface:
!bg /usr/local/bin/myscript MYADDR INTERFACE
or you could use the ``set filter'' command in your config file if
you just want to block things.
> FreeBSD-2.2.8
>
> Hello,
> I've been trying to figure out how to do this with no avail. I have a
> dialup link, using usermode ppp on the tun0 device. What I would like to be
> able to do is filter requests going to specific ports, via the dialup link.
> So for example, if someone tries to connect to my machine's telnet port (23)
> it'll be filtered. I don't want to filter out requests via the fxp0
> interface though. I also do not was to filter out any requests to port 23
> going out over the tun0 device. The thing is, most of the example rules in
> the ipfw config file need the machine's IP address to do this, and it is a
> dynamic address.
>
> Also, is there anyway/anywhere that ipfw logs packets that matched a
> specific rule, as in where and where it originated?
>
> Any help, pointers, references (other than 'man ipfw' unless you are
> pointing out a specific thing I missed) would be appreciated.
> -Chris
>
> P.S. I don't want to use tcpwrappers, citing the telnet port was just an
> example.
--
Brian <brian@Awfulhak.org> <brian@FreeBSD.org>
<http://www.Awfulhak.org>; <brian@OpenBSD.org>
Don't _EVER_ lose your sense of humour ! <brian@uk.FreeBSD.org>
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