[OT] squid + adsl

hi all,
i'm trying to realize a small home proxy-server with adsl connection.
Using adsl-start or adsl-connect the connection coming up because
"lynx www.google.com " works.

ip_forward = 1
ip_dynaddr =1

every iptable policy is ACCEPT

the routing table looks ok: the default route is on ppp0

in squid.conf

http_port 192.168.10.250:3280

my_net 192.168.10.0/24
acl http_access allow my_net

there's no portmap deamon activated

when i try to use internet form a client (192.168.10.189) using IE6 or
mozilla, i can see the connection from internal net to squid port (
ESTABLISHED ) , but nothing append on external net.
Does anybody can help me please?

thanks a lot

lore