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Re: [lwip-users] Sending to a non-local network without default netif se

From: HaaCee2
Subject: Re: [lwip-users] Sending to a non-local network without default netif set
Date: Fri, 14 Nov 2014 08:27:29 -0700 (MST)

In response to the remark:
"Simon is right: routing doesn't have anything to do with the source address
and it shouldn't have to"

I think Simon is not right (no pun intended).
I am not entirely familiar with the ideas behind LwIP. But sourcebased
routing is very much in line with rfc1122 (ip for hosts). I quote:

> Under the Strong ES model, the route computation for an outgoing datagram
> is the mapping:
>                          route(src IP addr, dest IP addr, TOS) -> gateway
> Here the source address is included as a parameter in order to select a
> gateway that is directly reachable on the corresponding physical
> interface. Note that this model logically requires that in general there
> be at least one default gateway, and preferably multiple defaults, for
> each IP source address.

We are facing a similar challenge with our project and we need a similar
mechanism. Is the adaptation of the ip_route available somewhere in the


Erik van Veelen

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