There are multiple bugs with wan load balancing affecting site to site tunnels (vti/gre tunnels excepted)
multiple issues with local traffic routing, pppoe and dhcp wan interfaces
and issues with not following the pbr of loadbalancing and instead using the default route.
enable-local-traffic under the wan load balancing has no bearing on these issues
https://forum.vyos.io/t/wan-load-balance-failover-trouble-with-dhcp/889
https://forum.vyos.io/t/ipsec-site-to-site-with-wan-loadbalancing-not-routing/1180
https://forum.vyos.io/t/wan-lb-and-mss-clamping-issues/8963/2
https://forum.vyos.io/t/multi-wan-load-balancing-configurations-have-no-effect/8738
https://forum.vyos.io/t/snat-rules-generated-by-load-balancing/2056/11
https://forum.vyos.io/t/wan-load-balance-rules-to-allow-local-traffic/3686/6
it seems that rules created in wan load balancing don't get followed by vyos itself.
https://phabricator.vyos.net/T2747
https://phabricator.vyos.net/T4362
https://phabricator.vyos.net/T4352
```
vyos@E1# show load-balancing wan
disable-source-nat
enable-local-traffic
flush-connections
```
a complete rework of the load balancing package is required it seems.
first steps should be discussed.