Ip Conflict issue slowing down Internet?

Having an issue where the Internet connection is slowing way down. checked out the sonicwall Logs and i get this little alert. Im fairly new with sonicwalls but its the same IP address having the issue, but from different mac addresses? how can i find out what device on my network has that IP? or should i shut that ip out of the scope? Including a picture of the sonicwall log. any info is appreciated. sonicwalllog sonicwalllog
JoemtAsked:
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sentnerCommented:
Do you have a device that is using that IP as a static IP address?  To find out what device it is, ping it from one of the systems on the same subnet, and then check the arp table (command arp -a) to get the mac address.  Once you have that, you can try and determine the type of device by searching here:  http://www.coffer.com/mac_find

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JoemtAuthor Commented:
sentner:
I followed your steps and found that it is a Dell based on the Mac prefix, and its set to dynamic.
in the log the mac address that reports the dhcp decline changes. Should i just remove that IP from the scope and see what happens?
Im confused because it seems like multiple devices are trying to register that IP and being declined, every hour, on the hour. which doesnt make sense to me.
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JoemtAuthor Commented:
ok so the "Reported by" in the sonicwall logs arent mac addresses like i though. since i tried to search them using the same search you suggested and that i used to find the dell...no results. so hmm.. my initial thought process was flawed from the beginning...so now i dont know if 1 or multiple devices are trying to use that IP. so im thinking i should find out where that device is and shut it down? then see what happens? or just /release /renew on it?
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sentnerCommented:
Yes, I'd suggest finding that device and seeing how it's configured (it may not be using DHCP).  The easiest fix may be to exclude that IP from the DHCP range, and seeing if the problem goes away.  

Also, be sure you only have one DHCP server operating on that network.  If there are multiples, they could be assigning conflicting addresses.
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JoemtAuthor Commented:
I cant seem to find how to Exclude that IP from the Scope, other than making 2 scopes, which i dont really want to do.
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sentnerCommented:
Depends on the DHCP server being used... Most have an option for excluding an IP or range.  Alternatively, you could "reserve" that IP for a bogus MAC address, which would keep anything else from getting it.
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JoemtAuthor Commented:
when i checked the ARP the IP address that is causing the issues was there. so i flushed it, and nothing has grabbed in in the last hour or so. But i havent seen the Conflict come up since then either. Im going to use your Reserve IP bogus mac address trick if it DOES come back again. otherwise im going to call this one solved for now. thanks for everything sentner! going to award points. if anything does come up thats crazy. ill repost.
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