On Thu 24 Nov 2005, Markus B. wrote: > i configured a router on debian, but i have some serious problems > 1. i can not ping google.com or any other side if my INPUT OUTPUT > Policities are on DROP because of unknown host, if i turn the firewall > off i can ping them so i think there must be a problem with my ports. > But i dunno wich port I still need to open cause i already did it with > 53 and 80.
Ping is ICMP... > 2. some of my friends who want to be forwarded via the router can just > load some pages. google.com, heise.de and some others dont work. On the > other hand they are able to connect to ICQ, or Skype. So what error do they get? Timeout? > iptables -t nat -A POSTROUTING -o ppp0 -s 141.28.227.0/16 -j MASQUERADE > iptables -A FORWARD -i ppp0 -d 141.28.227.178 -j ACCEPT > iptables -A FORWARD -i ppp0 -d 141.28.227.177 -j ACCEPT > iptables -A FORWARD -i ppp0 -d 141.28.227.223 -j ACCEPT You're doing a MASQUERADE on the outgoing ppp0 interface; it's not likely that packets will arrive at ppp0 from the outside with one of the 141.28.227.0/24 addresses you show (although it's possible, you don't tell what IP address you may have on the ppp0 interface). Best do something like this: iptables -A FORWARD -i ppp0 -o eth0 -j ACCEPT The masquerading should take care of the rest. > iptables -A FORWARD -o ppp0 -s 141.28.227.178 -j ACCEPT > iptables -A FORWARD -o ppp0 -s 141.28.227.177 -j ACCEPT > iptables -A FORWARD -o ppp0 -s 141.28.227.223 -j ACCEPT Similarly, you won't have packets leaving ppp0 with those source addresses with the MASQUERADE rule... > # router rules > iptables -A INPUT -i ppp0 -p tcp --dport 53 -j ACCEPT > iptables -A OUTPUT -o ppp0 -p tcp --sport 53 -j ACCEPT > > iptables -A INPUT -i ppp0 -p udp --dport 53 -j ACCEPT > iptables -A OUTPUT -o ppp0 -p udp --sport 53 -j ACCEPT You should probably consider having something like this: iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT and just allow outgoing packets to port 53, the above rule will allow incoming responses. > iptables -A INPUT -i ppp0 -p tcp --dport 80 -j ACCEPT > iptables -A OUTPUT -o ppp0 -p tcp --sport 80 -j ACCEPT Same here. Paul Slootman -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
