Need help from Mikrotik Gurus!

RouterOS Beginner Basics
1

Hi everyone,

I am fairly new to routeros but have managaged to configure a couple Mikrotiks. But now I am stumped and need help from Mikrotik gurus!

Current situation (working fine):

RB1100 with 4 networks:

192.168.200.0/24 ".200net (internet gateway network)
192.168.201.0/24 “.201net” (inside network)
192.168.202.0/24 “.202net” (inside network)
192.168.205.0/24 “.205net” (inside network)


One Routing table with all static routes:

0.0.0.0/24 192.168.200.10 (this is the internet gateway)
192.168.200.0/24 .200net (internal network)
192.168.201.0/24 .201net (internal network)
192.168.202.0/24 .202net (internal network)
192.168.205.0/24 .205net (internal network)


My Gateway to the internet is a firewall) on .200net. Firewall IP: 192.168.200.10

This all works great. So far so good. But I want to add ANOTHER internet gateway (a second firewall at IP 192.168.6.10.) To do this I’ve configured another Mikrotik interface to put the new gateway on:

192.168.206.0/24 “.206net”

I ONLY want traffic destined for 10.0.100.188 to be sent to this (new) gateway, and all
other internet traffic will continue to use the default route 0.0.0.0/24 192.168.200.10.
Now to accomplish this, I could just add another static route in my routing table like this:

10.0.100.188 .206net gateway 192.168.6.10

Which I’ve done, and it works great. So far so good, this is what I want.

But now for the problem: In the event that this new secondary route becomes unreachable, for whatever reason, I do NOT, UNDER ANY CIRCUMSTANCES, want the Mikrotik to send traffic destined for 10.0.100.188 to the default route 0.0.0.0/24 192.168.200.10. I just want it to fail, die, stop, spin its wheels, or ANYTHING BESIDES attempting to use the default route for this traffic.

I’ve tried identifying the 10.0.100.198 traffic with a routing rule, and sending it to a
secondary routing table–which worked, but my problem remains–when the secondary gateway becomes unreachable, the Mikrotik reverts to sending it out the main routing table’s
default route. I can see how this would help some people, but I want to avoid it at all costs. I am missing something, I must be doing something wrong. Can anyone
help? I would really appreciate! If you need more info or have questions I can post it.

Thanks!!

Metal legs

2

add a route to 10.0.100.198 with distance=100 (just high number) and type=blackhole

3

I bow to your superior knowledge. Thank you! I assume you mean add the blackhole route to the main table? I can’t wait to try this. :smiley:

4

yep, to the same table as the main route. when main route become inactive - blackhole is on stage

5

This worked like a charm! I can’t thank you enough!