Unable to write socket stream -- Mikrotik Router doing Recursive routes

[joshhboss]

I dont know how much this can be the fault of my router and I'll explain why I think it might have something to do with it. So with Mikrotik Routers I have been practicing with Recursive routes. (pinging dns to monitor your internet and failovering to secondary WAN if your gateway is still reachable but not the internet) Which is how I want to have it.

So Im working at an event and it is in about a week. I have 2 internet connections (WAN1 - 1gig/1gig, and WAN2 (400/30) So obviously I have one that is much more powerful than the other. But for some reason when I run iperf test to my iperf server (Ubuntu Server on Vultr) I wasn't able to get the test to run for more then more the a few moments before giving me the error. "error unable to write to stream socket: Connection refused". Now I have another set of Mangle rules that basically invert the roles of the WANs. basically making the 400/30 the primary internet and the 1gig/1gig the failover. Now when I run the test with that set of rules. that error does not happen. When I connect to another router that is on the same block of publics, I do not have the issue. I do not know where exactly I need to go digging to understand why this continues to happen. The internet seems to be working fine but once the event begins, the amount of clients connecting will shoot up to 3k to 4k. I dont want any mysterious behavior. I ALWAYS prep and iperf the hell out of my networks before an event, not being able to has me seriously concerned. The router im using is a CCR2116, so it is a pretty powerful router. I know this is an iperf discussion forum but I was hoping maybe there were some mikrotik users floating around that might be able to take a look, and maybe have come across the same similar issue.

There are some no-recursive routes in place just because I testing with different routing tables to make sure it wasn't something with he routes, but honestly it keeps happening. Does connection tracking have anything to do with this maybe ?

hope to hear from someone, I would greatly appreciate it.

Config is there in a zip file

CCR2116 Config.zip