It just occurred to me that sipx on centos has iptables. maybe not
active, but its got it.
can I use iptables, internally, without involving natting to do
selective port forwarding.
example:
private ip address of 192.168.0.2 sipx.secnap.com.
public ip of ITSP: 4.2.2.2
I want to do something like this:
if traffic comes in from source ip 4.2.2.2 to 192.168.0.2:5060
redirect it to 192.168.0.2:5080
(assuming that the original firewall did the natting. pretend here isn't
one)
all other traffic to 192.168.0.2:5060 goes to 192.168.0.2:5080
all traffic to 192.168.0.2:5080 goes to 192.168.0.2:5080.
pretend I know lots about freebsd and ipfw and just tonight figures out
how to type 'iptables --list'
eg: tutor me.
I am thinking that if this can be done, it might make life easier for
people like me and mitchel who can't get the ITSP to send to port 5080.
before I take m live phone system offline, look here, several paragraphs
down:
<http://www.linuxquestions.org/questions/linux-networking-3/iptables-port-forwarding-599401/>
they do something like this:
echo 1> /proc/sys/net/ipv4/ip_forward
iptables -t nat -A PREROUTING -p tcp -s *route_only_for_this_ip* -d *router_ip*
--dport 80 -j DNAT --to *destination_ip*:*destination_port*
iptables -t nat -A POSTROUTING -o eth0 -d *destination_ip* -j SNAT --to-source
*router_ip*
so, echo 1 > /proc/sys/net/ipv4/ip_forward (might not be needed)
but
iptables -t nat -A PREROUTING -p tcp -s 4.2.2.2 -d localhost --dport
5060 -j DNAT to localhost:5080
--
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