Free TON

Add second (backup) engine address

I think it will be useful for validator connection stability.
When main ip down, use backup ip till main ip up

Current ADNL Layer design lacks the description of transport properties (i.e ip Address) change mechanism. IP change IMHO should be propagated to DHT routing table across the participating nodes and this would slow down the catchain layer. Better solution would be to use the same IP Address switching on network layer (i.e ARP for Ethernet networks).

I mean provider internet ip, not local