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  # 1343442 15-Jul-2015 07:49
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The best thing about Mikrotik is that they come as a blank canvas. No assumptions are made in terms of what configuration is required.
And yea, if you are using it as a local dns server it will listen on ALL interfaces.
First thing to do would be create a 'drop all from wan' rule and then build the required 'accept' rules above that.

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  # 1343447 15-Jul-2015 08:09
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Zeon: Thanks for the help Ralph, I think your suggestion was spot on.

For those interested it looks like our router was running an Open DNS resolver being used in a DNS amplification attack.

When I had got the router I only configured the PPP details and WLAN and presumed that the firewall must be preset but obviously not!

It's a Mikrotik RouterOS device. You could access the web control panel, SSH, telnet - pretty much everything over the WAN interface....


The default Mikrotik router configuration has a drop rule on the Ether1.

It's important if you configure a VLAN10 or use PPPoE that you replicate this rule on the VLAN10 or PPPoE inbound interface.


 
 
 
 


Mr Snotty
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  # 1343450 15-Jul-2015 08:17
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Damn, I didn't ask that since I presumed you would firewall all the ports :)

I personally always run a port scan via GRC Shield's Up to confirm it is firewalled even if I know it is. With some routers it may surprise you.






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  # 1344690 15-Jul-2015 14:00
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Yea, my mistake on that presumption! I struggled to use the web-UI on Mikrotik to configure the firewall - it ended up being the command line was actually more user friendly :S




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