netdev - question about configuring multiple interfaces on a host within the same ipv6 sub-net

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Date:   Fri, 23 Jul 2021 23:15:19 -0700
From:   hui wang <huiwangforfbjob@...il.com>
To:     netdev@...r.kernel.org
Subject: question about configuring multiple interfaces on a host within the
 same ipv6 sub-net

Hi All

I have an host (running centos8), it has multiple interfaces connecting 
to the same IPv6 sub-net. Different IPv6 addresses are statically 
assigned to these interfaces. All these interfaces are assigned with the 
same gateway address.

I'd like to config the routing policy so that:

     All packets with source IP address specified goes out via the 
interface where the source IP address was assigned to.
     When source IP address is not specified by application. (ex. TCP 
sync packet), different interfaces' IP address is picked (as source IP 
address) randomly (if the destination IP address is different).

How do I config routing policy to achieve these in such an environment.

Please let me know if there are more appropriate mail lists for my question.

Thanks,

Hui