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There is only one target for checking ICMP/ARP
Extend it for checking multiple targets
set protocols failover route 192.0.2.55/32 next-hop 192.168.122.1 check target '203.0.113.1'
set protocols failover route 192.0.2.55/32 next-hop 192.168.122.1 check target '203.0.113.11'
The route will be installed only if all targets are 'alive'
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If there is no route in the routing table (requires install route)
it checks routing table and returns best route None
But if we have 2 routes to the same dest ip but with different
metrics it doesn't get None (not first route install)
It cause that bast metric route cannot be installed (wrong logic)
Add func "is_route_exists" and check route/gateway/metric for
the required route
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Failover route allows to install static routes to the kernel routing
table only if required target or gateway is alive
When target or gateway doesn't respond for ICMP/ARP checks this route
deleted from the routing table
Routes are marked as protocol 'failover' (rt_protos)
cat /etc/iproute2/rt_protos.d/failover.conf
111 failover
ip route add 203.0.113.1 metric 2 via 192.0.2.1 dev eth0 proto failover
$ sudo ip route show proto failover
203.0.113.1 via 192.0.2.1 dev eth0 metric 1
So we can safely flush such routes
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