When configuring ROS 6.6 so that one interface has one static ip and one ip from dhcp (both in the same subnet) - after a week the interface stop responding to any packets.
Status in the routing table for 0.0.0.0/0 route is "unreachable". But pinging the gateway from the router does get reply.
This router was set up with no firewall nor nat-rules.

Rebooting the router does not make the interface start responding.

When deleting either the dhcp client or the static ip, the interface starts responding again.

The changelog for ROS 6.6 states something related to multiple IP's, so I'm thinking this is an ARP-update failure that might have been introduced with the new ROS.

However, if the issue was an arp-failure, I'd expect that restoring the config that was running for a week would make the config run for another week - it didn't. Restoring the config from backup puts the interface dead immediately.

Does anyone have a clue what may cause this behavior?

I think that can be related to the issue i'm having on ROS6.5
I have 2 WAN connected to the same operator (2 ADSL routers with few static ip adresses) on port 9 and 10 on an RB2011UAS.
Problem is, i cannot enable both interfaces. If i do, ROS Kicks me out or i cannot ping the public IPs configured on the ports. It seems the behaviour of a loop, but either ports have the "master port" set to "none", mac adress is different and have different ranges of public ip adresses (no internal LAN adresses configured on them). That is getting me crazy.