[SOLVED] Forward public IP to local IP

raczkowski1 · 03-23-2012, 06:23 AM

HI

I have host in local network with ip 192.168.10.50
and I forward publick ip 100.100.100.3/25 to 192.168.10.50

iptables:

Quote:

/sbin/iptables -t filter -A FORWARD -s 192.168.10.50 -j ACCEPT
/sbin/iptables -t filter -A FORWARD -d 192.168.10.50 -j ACCEPT
/sbin/iptables -t nat -A POSTROUTING -s 192.168.10.50 -j SNAT --to 100.100.100.3
/sbin/iptables -t nat -A PREROUTING -d 100.100.100.3 -j DNAT --to 192.168.10.50

Everything works fine bun I can't ping in the same subnet(100.100.100.0/25) where is using 100.100.100.3

Where could be problem?

Thanks

nikmit · 03-23-2012, 10:15 AM

are all your hosts on the 100.100.100.0/25 subnet configured with the same netmask?
if some are configured as /24 rather than /25 things will break

raczkowski1 · 03-25-2012, 11:17 AM

Hi
I have public range address IP with 23 bits netmask but I cut this for few smaller subnets and one have /25 bits mask.

Yesterday I resolved problem by setting public IP 100.100.100.3(this is example IP) on physical network card in my server and everything working now OK.

Thanks for reply.