I have a RUT240 with ethernet WAN set as primary and mobile set to secondary. The health check is to ping s3.amazonaws.com every 10 seconds, with a 3 second timeout and 5 failed attempts before failover and 3 succeeded attempts before recovery.
For some reason, the RUT240 keeps failing over to wireless, yet if I go onto CLI and I do a "ping s3.amazonaws.com -I eth1" (eth1 is the WAN interface), I get answers just fine:
root@Teltonika-RUT240:/mnt/mtdblock7# ping s3.amazonaws.com -I eth1
PING s3.amazonaws.com (22.214.171.124): 56 data bytes
64 bytes from 126.96.36.199: seq=0 ttl=236 time=6.604 ms
64 bytes from 188.8.131.52: seq=1 ttl=236 time=6.669 ms
When I plug the WAN wire directly into my PC I can also ping s3.amazonaws.com fine as well.
Running firmware RUT2XX_R_00.01.13.1