iptables and pptp - dialin

[Manfred Sampl <msampl@gmx.net>]

Hello,

I have major problems setting up a ruleset of iptables rules for DSL dialin. 
I'm using pptp to connect to my ISP. On the web, I have found a number of 
example configs... (of course I had a look at the docs :-)

Thats what I have got so far, but the connection is closed a few moments after 
applying the rules:

$IPTABLES -t filter -A INPUT -i $EXTIF -p tcp --dport 1723 -j ACCEPT 
$IPTABLES -t filter -A INPUT -i $EXTIF -p gre -j ACCEPT               
$IPTABLES -t filter -A FORWARD -i $EXTIF -o $INTIF -s $INTIP -d $INTIP -j 
ACCEPT
$IPTABLES -t filter -A FORWARD -o $EXTIF -i $INTIF -s $INTIP -d $INTIP -j 
ACCEPT

line 1+2 is more or less clear, but isn't there a OUTPUT necessary? And what 
are line 3+4 good vor? Do I have to set up a rule for the server IP 
10.0.0.138?

THX for any help
Manfred

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