iptables

[Amir Tal <tal whatsup org il>]

hi,

one of my machines at home is running RH72 , 2.4.9-31 (upgraded from up2date) 
and since i upgraded i am having problems forwarding traffic through that 
machine using iptables.
the iptables version that comes with RH originally is iptables-1.2.3-1, and i 
figured that an upgrade is in order here so i removed the old packages and 
installed iptables-1.2.4-2 using up2date. this is the same error i am getting 
before and after the update :

# /sbin/iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
/lib/modules/2.4.9-31/kernel/net/ipv4/netfilter/ip_tables.o: init_module: 
Device or resource busy
Hint: insmod errors can be caused by incorrect module parameters, including 
invalid IO or IRQ parameters
/lib/modules/2.4.9-31/kernel/net/ipv4/netfilter/ip_tables.o: insmod 
/lib/modules/2.4.9-31/kernel/net/ipv4/netfilter/ip_tables.o failed
/lib/modules/2.4.9-31/kernel/net/ipv4/netfilter/ip_tables.o: insmod ip_tables 
failed
iptables v1.2.4: can't initialize iptables table `nat': iptables who? (do you 
need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.

insmod produces the following :

# insmod ip_tables
Using /lib/modules/2.4.9-31/kernel/net/ipv4/netfilter/ip_tables.o
/lib/modules/2.4.9-31/kernel/net/ipv4/netfilter/ip_tables.o: init_module: 
Device or resource busy
Hint: insmod errors can be caused by incorrect module parameters, including 
invalid IO or IRQ parameters

idea's anyone ?