second default route freezes all traffic

RouterOS
1

we have a hex router with mostly the default factory config hooked up at our site. the only non-default part is, it’s getting internet from the lan side through a default route advertised via ospf from isp 1. using ospf, everything is honkey dory and flowing.

the issue arises when i connect it to what i want to be its primary isp, isp 2, and it gets a new default route, which completely freezes all freezes all traffic, even on the local side. (the new isp connection would be nat’ed though i don’t know why that should kill local traffic.) even icmp, which as per default config has its own allow rule in the firewall regardless of the interface, also stops working. until safemode undoes the changes and brings everything back.

is this ringing any kind of bells for anyone? where could i start looking?

2

To prevent overheating our crystal balls please draw the network diagram, describe it and post exported configuration with serials/passwords removed.

3

Check if your both upstream interfaces is on the same bridge if they do remove both of them from the bridge this is just an speculation please attach your config

4

spare your crystal balls for this, i had an ospf misconfiguration. thanks for dropping by though :slight_smile: