Port / IP redirection allows you to direct traffic to alternative ports/IP addresses.
It is controlled by the file
Redirect from one IP address to a different one:
IPx|*|IPy|*|tcp/udp - To IPx redirects to IPy IPx|portA|IPy|portB|tcp/udp - To IPx to portA redirects to IPy portB
Redirect from port to a different one:
IPx|portA|*|portB|tcp/udp - To IPx to portA redirects to portB *|portA|*|portB|tcp/udp - To portA redirects to portB
*|666|*|25|tcp 203.0.113.60|666|*|25|tcp 203.0.113.4|666|*|25|tcp
• Where a port is specified it cannot be a range, only a single port.
• All redirections to another IP address will always appear on the destination server with the source of this server, not the originating IP address.
• This feature is not intended to be used for routing, NAT, VPN, etc tasks.
/proc/sys/net/ipv4/ip_forwardmust be set to 1 for DNAT connections to work. CSF will set this where it can, but if the kernel value cannot be set then the DNAT redirection many not work.
||This file contains a list of port and/or IP address assignments to direct traffic to alternative ports/IP addresses.|