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I have a point to point wireless connection using two mikrotiks. When I plug the mikrotik into a switch with just my laptop I get an IP address conflict on my machine no matter what IP I am assigned. Using wireshark i see the conflicts are from the mac address of the mikrotik on the other end of the wireless connection. Why is it conflicting with multiple IP addresses when the router itself is assigned a single IP address with no NAT entries or anything like that? I included a little diagram to help visualize my issue

[me] [mikrotik] --------------[problem mikrotik]----(other equipment on diff subnet)

The problem mikrotik has a wan on the same subnet as my machine. The lan is a different subnet. Any ideas? When I plug the equipment into my network I get IP conflicts on a lot of different servers. Took me forever to isolate it to this mikrotik! Thanks

Oh and all this equipment has been working previously with no known changes made to the configs. It just started acting up recently.

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Have you tried turning it off and on again? –  SpacemanSpiff Sep 8 '11 at 19:52
    
What are the IP addresses of the 2 routers? Also is there a route in place, it could be corrupt.. Have you reset the router to your pc and reconfigured? If you can do it... –  David Sep 8 '11 at 20:20
    
192.168.1.100 for central router and 192.168.1.101 for problem router WAN and 10.0.0.1 for it's LAN. There are routes in place and they are the same as before the problems started happening. These mikrotiks have been working for literally years with this config and nothing appears to be changed. I've done some google searches and it appears this problem has occured for others and the only fix I've seen is to replace the router. I'm hoping serverfault can offer up some better suggestions! Thanks for your reply –  Jason Sep 8 '11 at 20:38
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many many times –  Jason Sep 8 '11 at 21:20
    
It isn't doing arp spoofing, or something similar on the WAN interface is it? –  NickW Mar 1 '13 at 9:29
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