Skip to main content
RPC
RPC
Associate III
January 21, 2025
Solved

IP Forwarding

  • January 21, 2025
  • 2 replies
  • 688 views

Hello, I have a question about LWIP functionality.

I'd like to know if it's possible to redirect a tcp request received on the pppos interface, to a device that is connected onto the ethernet interface and listening on the desired port.
Thanks in advance!

Best answer by STea

Hello @RPC ,

I assume that would be possible as mentioned in LwIP documentation and this can be done by setting 

#define IP_FORWARD   1
(add this to lwipopts.h)

IP_FORWARD==1: Enables the ability to forward IP packets across network interfaces. If you are going to run lwIP on a device with only one network interface, define this to 0. refer to lwIP: IPv4.
Regards


2 replies

S
STeaBest answer
ST Employee
February 18, 2025

Hello @RPC ,

I assume that would be possible as mentioned in LwIP documentation and this can be done by setting 

#define IP_FORWARD   1
(add this to lwipopts.h)

IP_FORWARD==1: Enables the ability to forward IP packets across network interfaces. If you are going to run lwIP on a device with only one network interface, define this to 0. refer to lwIP: IPv4.
Regards


In order to give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.
    Andrew Neil
    Andrew Neil
    Super User
    February 18, 2025

    https://www.nongnu.org/lwip/2_0_x/group__lwip__opts__ipv4.html#ga881d32ff5ee02af01f758953f1b51d59

    A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
    Terms & ConditionsAccessibility statement