sendto: Operation not permitted

[Claudio Mio]

Hi   My firewall has been running for sometime. However there have been somethings that I could never do. This has not caused me problems until now.   The machines is running Mandrake 8.1 and has an internal interface (eth0) and an external interface (ppp0).   The problem is I cannot ping machines on the internal lan and I cannot ping localhost. I can ping machines on the net ok however. The error I get is: sendto: Operation not permitted   If I kill the iptables service by running: /etc/rc.d/init.d/iptables stop I can ping successfully both localhost and the machine on the internal lan. If I start the iptables service and reset the rules to ACCEPT for everything then I can reproduce the problem. Ie I get: sendto: Operation not permitted This says to me there is something other than iptables at work here? Is the kernel getting involved at all? This is probably relevant.... My rc.local echos '0' into /proc/sys/net/ipv4/icmp_echo_ignore_all & /proc/sys/net/ipv4/conf/all/accept_source_route. Any help would be appreciated... Thanks, Claude