On Mon, 25 Jul 2005, Rod Roark wrote:
On Monday 25 July 2005 03:22 pm, Chris Jenks wrote:
Setting the iptables rules starts with:
iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -A INPUT -m state --state NEW -i ! ppp0 -j ACCEPT
iptables -P INPUT DROP
iptables -A FORWARD -i ppp0 -o ppp0 -j REJECT
Seems like this would drop all your incoming UDP packets, e.g.
responses to DNS queries. Regardless, try starting with the
simplest possible firewall with NAT and add things a little at
a time until you find something that breaks it.
-- Rod
I remembered that I had to adjust the MTU from 1500 to 1492 on the
router when I set up pppoe on it, and when I read about MTU again, I
realized that I also need to adjust it on the host machines behind the
firewall as well. When I lowered the setting on one of the hosts from 1500
to 1412, I could download mail.yahoo.com/index.html.
Yours,
Chris
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