Running Gentoo, kernel version 2.4.24 on a Sparc Ultra 10
I have recently purchased Vonage Voice over IP. In their 'how to make this
work with a linksys device', they say (basically):
Forward udp ports 53, 69, 5060, 5061, and 10000-20000 to the device.
I interpret this to mean:
iptables -t nat -A PREROUTING -i eth0 -p udp -d $EXTERNAL_IP \
--dport 53 -j DNAT --to 192.168.0.5:53
etc for each port.
Unfortunatly, I don't seem to be able to specify a range of ports in the
iptables syntax. So, when I get to that large, 10,000 wide range of ports,
it dies. After much tinkering, I find that I can do:
for port in {10000..10597}; do
iptables -t nat -A PREROUTING -i eth0 -p udp -d $EXTERNAL_IP \
--dport $port -j DNAT --to 192.168.0.5:${port}
done
and it will work. If I do just 1 port more, iptables fails, and all the
tables get magically flushed (which isn't a good idea by the by, but we'll
get there later).
Idealy, I'd like to:
iptables -t nat -A PREROUTING -i eth0 -p udp -d $EXTERNAL_IP \
--dport 10000-20000 -j DNAT --to 192.168.0.5:10000-20000
and call it a day.
Their table that describes this (text version of the linksys web
configuration tool. '_' are unchecked boxes, 'X' are checked boxes):
Ext.Port Protocol Protocol IP Enable
TCP UDP
53 to 53 _ X 192.168.0.5 X
69 to 69 _ X 192.168.0.5 X
5060 to 5061 _ X 192.168.0.5 X
10000 to 20000 _ X 192.168.0.5 X
Any help would be greatly appreciated.
Thanks;
--Jason
