Set source IP for traffic originating from the router

Installing and Using OpenWrt
1

I have 3 tunnels connected via different internet uplinks and routed thru a VPS with OSPF. I announce a dummy interface IP to the other end as a consistent destination for traffic to route across one of the 3 active tunnels.

the issue I'm seeing is traffic that originates from the Openwrt router uses the interface IP of the link that is active, such as a DNS or NTP connection. This isn't preferred because I would like to not announce these /30 PTP links in my larger BGP network.
I want to make all traffic originating from the router to use the IP assigned to the dummy interface as the source address for all packets, is this possible in openwrt?

2

Can't you configure the preferred source addresses of the routes that are used?

BTW the source option of IPv4 routes in OpenWrt is the preferred source address.

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3

If you use bird for the bgp you could use and set krt_prefsrc when exporting routes to the kernel table.

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