On 13 Apr 2018, at 10:45, kay <kay.d...@gmail.com> wrote:
> I have a special use case for the Direct Routing (DR) mode.
> Is there a possibility to reroute SYN packets, when they can not be
> delivered to the backend? It could be easily detected by several SYN
> packets being sent.

Repeating the earlier answer:

You need an extra application to do this. There are several, but I’d suggest 
you look at keepalived as a first option.

There was much discussion many years ago (20 or so) about putting 
realserver/backend monitoring into IPVS, but it was felt at the time that this 
wasn’t a kernel function and should be handled by a userspace application. That 
still applies today.

Please read the documentation before posting - it's available at:

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