SNAT and DNAT

[Florent]

Hi,

For moving some boxes to the local side of my firewall, I want the firewall to get alias IP for these boxes and DNAT the traffic to the new IPs the boxes.
Actually, my script contains this line  for a PC with old IP 192.168.1.4 and new 192.168.3.4 for example :

iptables -t nat -A PREROUTING -i eth0 -d 192.168.1.4 -j DNAT --to 192.168.3.4

Is it necessary to SNAT all outgoing packets from this box with :

iptables -t nat -A POSTROUTING -o eth0 -s 192.168.3.4 -j SNAT --to 192.168.1.4



Florent