This is used to explicitly override the core network stack's routing decision.
.B mangle
table.
.TP
.BI "--oif " "ifname"
Route the packet through `ifname' network interface
.TP
.BI "--iif " "ifname"
Change the packet's incoming interface to `ifname'
.TP
.BI "--gw " "IP_address"
Route the packet via this gateway
.TP
.BI "--continue "
Behave like a non-terminating target and continue traversing the rules.  Not valid in combination with `--iif'