I'm not a newbie to linux or networking with linux, but iptables has me beat. I'm setting up a router/firewall for a friend of mine who has Bellsouth DSL, PPPOE works fine, everything works fine, except the firewall.

he can browse the web just fine, for most sites. Some sites, just.. wont connect. The one we've really noticed is jobsearch on monster.com. He can get to monster's front page, but when he clicks on search for jobs.. it just..does nothing. There are a few other sites, but this is the one we're using for testing purposes.

Anyway. Walking the interfaces we find

eth0 10.0.0.1 255.0.0.0
This is connected to the cable modem (10.0.0.138)
ppp0 Dynamic IP
This is the actualy net connection via PPPOE.
eth1 192.168.0.1 255.255.255.0
Connection to his lan

For the point of just tryint to get this to work i've defaulted to a 4 line firewall.

$IPTABLES -P INPUT ACCEPT
$IPTABLES -P OUTPUT ACCEPT
$IPTABLES -P FORWARD ACCEPT
$IPTABLES -t nat -A POSTROUTING -o ppp0 -j MASQUERADE

/proc/sys/net/ipv4/ip_forward and ip_dynaddr are both 1

I've also check to make sure that ECN (Explicit Congestion Notification) isnt turned on.

I basicly cant think of anything that can be causing this.. does anyone have any idea.