I’m using a Mikrotik 751 router with a nearly default config which has a Gateway address on my 10.0.1.0/24 network (it’s being double NAT’d). The other ports are all bridged and have a LAN side address of 192.168.1.0/24. My cables are already run and I have a VOIP phone next to a computer at a couple locations with only one cable going to each PC/Phone workstation. So I wanted to use the phone’s PC switch port that’s built in on the Aastra phones. I want the PC’s to be on the 192.168.1.0 network and the phones to be on the 10.0.1.0 network. So I gave the phones a 192.168.1.xxx address and then did a src-nat and dst-nat Firewall NAT rule to make them appear as 10.0.1.xxx. Then I assigned the additional 10.0.1.xxx addresses to the WAN port of the 751u. It all worked fine, until a reboot. Then the default IP route got messed up due to the additional IP’s. I couldn’t remove the routes or alter the distance as they were dynamically created. Is there a better way of accomplishing what I’m trying to do?
If you add those extra 10.x.x.x addresses as 10.x.x.x/32 then the only routes they should produce will be for the individual IPs - no network range or default gateway.