Re: [MASQUERADING] iptables keeps sending from old IP after ppp0's IP has changed

[Daniel Musketa <Daniel@musketa.de>]

Am Mittwoch, 30. August 2006 15:01 schrieb Jan Engelhardt:
> >Every night the router's ppp0 goes down and after about a minute up again
> > with a new IP. But iptables keeps on sending the NATted UDP packets
> > _from_ the old IP address. `iptables -F` and reloading the rules doesn't
> > help. The only workaround is to stop asterisk on the NAT client for about
> > 2 minutes.
[...]
> >How can I force iptables to use ppp0's real IP address as sender IP in
> >outgoing packets?
>
> Flush the conntrack table when ppp0 has gone up (yes, up)

Is there a cleaner way than

#!/bin/sh
TIMEOUT=$(cat /proc/sys/net/ipv4/netfilter/ip_conntrack_udp_timeout)
TIMEOUT_STREAM=$(cat /proc/sys/net/ipv4/netfilter/ip_conntrack_udp_timeout_stream)
	
echo 0 > /proc/sys/net/ipv4/netfilter/ip_conntrack_udp_timeout
echo 0 > /proc/sys/net/ipv4/netfilter/ip_conntrack_udp_timeout_stream

sleep 10

echo ${TIMEOUT} > /proc/sys/net/ipv4/netfilter/ip_conntrack_udp_timeout
echo ${TIMEOUT_STREAM} 
> /proc/sys/net/ipv4/netfilter/ip_conntrack_udp_timeout_stream

#EOF

?

Daniel