Re: [Bridge] Split path for packets, and bridge configuration problem.

[Stephen Hemminger <stephen@networkplumber.org>]

On Wed, 31 Jul 2019 11:55:37 -0700
John Clark via Bridge <bridge@lists.linux-foundation.org> wrote:

> I’m trying to configure a Linux system to bridge an ethernet link for packet ingress from a local network and combine that with a radio link for the reply packet egress.
> 
> I vaguely recall something like this use to be used for Satellite links, where the incoming packets from the outside world were via the Sat link, but outgoing packets were via a terrestrial link, phone modem or DSL, depending.
> 
> What I have working is the packet entering the bridge on the ethernet link, then I see the MAC address of the node from the in the ‘bridge show’ output, but even if I assign the MAC address to the ‘radio’ tap interface, I see both the ‘ethernet’ port as ‘master’, and the tap device as ‘self’, but no packets are sent to the tap device.
> 
> In the past I’ve just written user apps that basically implement tunnels and using collection of such apps and taps, gotten packets to where I need them to be.
> 
> I was trying to use more standard tools, and not write more custom code.
> 
> Thanks for any assistance.
> John Clark.
> 

Hacks like this are best done with netfilter.