Re: Linux firewall question..

["Crist Clark" <crist.clark () globalstar com>]

delarion wrote:
> I have a Linux box running IPchains, a firewall script, uredir, and
> portfwd... I was wondering if it is possible to make it allow GRE (IP 47)
> for MS-PPTP / VPN?  Could someone point me in the right direction on where I
> would go to obtain such information?

Uh, 'man ipchains?'

       -p, --protocol[!] protocol
              The protocol of the rule or of the packet to check.
              The  specified  protocol  can  be  one of tcp, udp,
              icmp, or all, or it can be a numeric value,  repre-
              senting  one of these protocols or a different one.
              Also  a  protocol  name  from   /etc/protocols   is
              allowed.    A  "!"  argument  before  the  protocol
              inverts the test.  The number zero is equivalent to
              all.   Protocol  all  will match with all protocols
              and is taken as default when this option  is  omit-
              ted.   All  may  not be used in in combination with
              the check command.

Been a while since I've used ipchains, I pulled the documentation
off of one of those man-to-HTML webpages. 
-- 
Crist J. Clark                                Network Security Engineer
crist.clark () globalstar com                    Globalstar, L.P.
(408) 933-4387                                FAX: (408) 933-4926

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