Hello! I've got the following setup: ippp0 (isdn), ppp0 (adsl), eth1 (internal lan), eth0 (nic dedicated to the adsl modem) Firewall rules: Default 2.4. iptables (everything set to accept) except: iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE iptables -t nat -A POSTROUTING -o ippp0 -j MASQUERADE Routing Table: Default gw is set to the ptp partner of ippp0 Problem: Packets which are received on ppp0 don't get responded (tcpdump shows only the incoming packets, no responses; stuff like ident lookups from irc servers time out although a ident server is running and bound to 0.0.0.0) Connections which get masqueraded through ppp0 with the following ruleset: ip rule add from 192.168.0.10 to default iif eth1 table 50 ip route add table 50 via <ptp partner of ppp0> work fine though. If i switch the default gateway of the system from ippp0 to ppp0 i can reach ppp0 from the outside w/o any problems, but ippp0 is unreachable. ip_forward is enabled, rp_filter is disabled. Do you need any additional information to help me on this? best regards, Michael Renner
