add "src" attribute to kernel route

Alexander Zubkov green at
Tue Jan 22 09:47:50 CET 2019


Yes, it is possible. Take a look at the docs:

On Tue, Jan 22, 2019 at 9:41 AM Volodymyr Litovka < at> wrote:
> Hi colleagues,
> in Linux it is possible to specify source IP address for all packets
> with undefined this field, like:
> root at n1:~# ip route
> dev eth1 proto kernel scope link src
> via dev eth1 src
> using the command
> root at n1:~# ip route add src nexthop via
> dev eth1
> (note "src" parameter)
> This configuration instructs kernel to assign specified source address
> for all outgoing packets which travel to specified destination, if
> source address in the packet is unspecified. This quite important in
> order to provide reliability for applications which can't specify source
> IP address. in general, for such apps Linux chooses IP address of
> outgoing interface and, when this interface gone, all sessions go away
> as well since they're binded to interface's address. If I will be able
> to assign Loopback address, I will always have sessions active
> regardless of physical interfaces' state.
> Whether it's possible to configure Bird (We're using 1.6 on Ubuntu 18)
> in same way - when installing routes into the kernel, add "src"
> parameter like in the example above?
> Thank you.
> --
> Volodymyr Litovka
>    "Vision without Execution is Hallucination." -- Thomas Edison

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