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VCP5: WAN load-blancing rework

Up to VyOS 1.3 there is a dedicated CLI tree load-balancing wan used to aggregate multiple WAN links for either load-sharing or backup.

When reworking this implementation for VyOS 1.4 we should rethink the CLI design and also the concept behind it.

Current status

load-balancing relies on a dedicated "daemon" written in C that directly interacts with iptables/nftables and the routing. It also comes with a duplicate copy of the NAT CLI nodes only used for WAN load balancing which is quiet redundant.

Design Goals for a redesign

  • Make use of the common nat source CLI tree
  • Make use of failover-route implementation
  • Get rid of any additional daemon monitoring those routes