{{tag>[iptables networking linux]}}
=====Temporary redirect traffic to other host=====
I've used the steps below to temporary redirect IP traffic, during migration to another host. Tested on CentOS 6.x

  * Configure the kernel to allow forwarding:<code>echo 1 > /proc/sys/net/ipv4/ip_forward</code>
  * Route traffic to destination:<code>iptables -t nat -A PREROUTING -p tcp --dport 443 -j DNAT --to-destination 2.2.2.2:443</code>
  * Allow forwarding: <code>iptables -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -A FORWARD -p tcp -d 2.2.2.2 --dport 443 -j ACCEPT</code>
  * Masquerade outgoing connections:<code>iptables -t nat -A POSTROUTING -j MASQUERADE</code>
  * Show active rules:<code>iptables -nvL -t nat</code>
  * Delete rules:
    * Find line numbers: <code>iptables -nvL -t nat --line-numbers</code>
    * Delete rules using line number:<code>iptables -t nat -D <num>
iptables -D FORWARD <num></code>