[lwip-users] bind and ip_route

[Emil Ljungdahl]

Hi all

 

I’m struggling with lwIP in a multihomed setup (2 physical interfaces, A and B). Both interfaces are connected to a LAN with a default gateway as the only route per interface.

 

If I bind to a port and IP-address of interface B and receives (for example) a HTTP connection request, the reply might be sent on interface A, since ip_route only selects interface depending on destination address. I’m not the guy to tell what is wrong and what is right regarding the IP-stack, but shouldn’t a netconn/socket/pcb that is bound to a local address, that is “owned” by a local netif, only use that netif for both rx and tx?

 

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Best regards

Emil Ljungdahl