Why does DNS assign same IP's on computers

I continuously see that DNS is assigning 2 computers with the same IP. Is this normal? What kind of problems can this cause? How can it be prevented? Thanks.
fstincAsked:
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JamesSenior Cloud Infrastructure EngineerCommented:
What you need to do is checked the ip schema on the PCs in question and check if they are configured for DHCP or are they using a Static IP Schema.
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farzanjCommented:
It is possible under various conditions.  They may be aliases or they may be in the round robin pool.  With round robin pool the load is divided among a pool of machines.

Or, it may simply be an error.
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JamesSenior Cloud Infrastructure EngineerCommented:
DNS is used for name resolution. On a network your PCs should always look to the Server configured a DNS server to provide name resolution to requests from client PCs. In DHCP in the scope option this has the option to add the ip address of a DNS Server. So, when clients are booting up to the Server, DHCP will provide the client PCs with the ip address of the DNS Server.

On a network with no Server, such as a Workgroup a Router will provide the ip settings for client PCs.
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enachemcCommented:
one possible cause could be that the ethernet adapters have the same MAC address
run an IPCONFIG /all to diagnose this
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fstincAuthor Commented:
This computer was not on the domain. After I join it to the domain it still resolves with the same IP address even after I release and renew it. I would need to get a hold of the other computer to see if it has the same mac address, but now that I think about it, this might be the other computer since I had to reimage it. . .
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enachemcCommented:
you do not need to find the other computer
unplug the first one
use a third computer:
ping the IP
arp -a

read the mac address
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fstincAuthor Commented:
Is this syntax correct:

arp -a 192.168.x.x? I tried variations but doesn't do the job. Looks at the cmd help options, but dont see how to do this.
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enachemcCommented:
just do a ping on the IP in doubt
after the ping, arp -a
just that
the ping is neccesary for the arp to function
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fstincAuthor Commented:
Awww. Nice. From the looks of it, I cant ping the other computer, which means its lost and I have to find it or it doesnt even exist. Nonetheless, info is helpful. Thanks.
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