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168 posts

Master Geek


#138751 15-Jan-2014 15:44
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I've got a Mikrotik Routerboard hooked up to a (Snap) VDSL connection via a Vigor VDSL router in bridge mode. Overnight my observed speed dropped substantially, and after hunting around for a while I've noticed that the Mikrotik is reporting fairly heavy transmit bandwidth usage (3-5Mbps). The link speed from the Vigor is sill about 26 down/7 up, which I think is quite reasonable and is consistent with what I normally get.

I've gradually unplugged everything on the network side of the Mikrotik without seeing the Tx usage drop. This suggests to me that the Mikrotik is doing something stupid with the connection. Or perhaps someone's compromised the router?

Any thoughts?

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1273 posts

Uber Geek


  #967627 15-Jan-2014 15:54
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Have you turned off the bandwidth test server authentication? Try torching the interface facing the Vigor and see what the traffic is (prot/port)




Most problems are the result of previous solutions...

All comment's I make are my own personal opinion and do not in any way, shape or form reflect the views of current or former employers unless specifically stated 



168 posts

Master Geek


  #967645 15-Jan-2014 16:17
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]

This is torch on the interface. Not sure how to get info on the source/dest port?

As far as I can tell the bandwidth test is not configured at all (there's 0.0.0.0 in the "Test to" field.

 
 
 
 


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  #967650 15-Jan-2014 16:20
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What are your firewall rules for the WAN? Is your DNS exposed?

You really need to torch the interface and see what the traffic is and where it's going.



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Uber Geek


  #967658 15-Jan-2014 16:27
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lyndondrake: ]


This is torch on the interface. Not sure how to get info on the source/dest port?

As far as I can tell the bandwidth test is not configured at all (there's 0.0.0.0 in the "Test to" field.


You need to tick Port and Protocol




Most problems are the result of previous solutions...

All comment's I make are my own personal opinion and do not in any way, shape or form reflect the views of current or former employers unless specifically stated 



168 posts

Master Geek


  #967659 15-Jan-2014 16:29
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BTW figured out how to use torch - but now whatever was going on seems to have stopped.

Here's my firewall rules - might well need to put some more in there :-)




168 posts

Master Geek


  #967747 15-Jan-2014 19:44
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Having eventually figured out how to use torch I realised I was being used for DNS amplification (is that the right term? spurious DNS requests). I had to add a default drop rule to the pppoe interface as of course the ether1 interface doesn't get a chance to intercept the packets.

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  #967793 15-Jan-2014 21:25
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Hardly surprising it was DNS, it's a massive problem now.

If you have a router that has DNS exposed it's not a matter of when you'll get attacked, it's simply a matter of how much bandwidth the attack will use and how long it'll take to be detected.

Why do you have the forward rules?




 
 
 
 




168 posts

Master Geek


  #968179 16-Jan-2014 14:13
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I've removed the forward rules. At one point I reset the Mikrotik and the rules it put in were different from those I'd had previously.

Thanks for the help — things seem to have calmed down now.

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