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Can two physical devices use the same Virtual IP

Posted on 2009-04-22
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Last Modified: 2012-05-06
this might be a very dumb question, but I have a situation where to machines are trying to use the same group of IPs as virtual addresses. They are trying to use X.X.X.251-254. Will this cause problems?

I believe this would cause problems, but I just wanted to hear it from some one else.

Thanks
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Question by:Teleswitch
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Expert Comment

by:omarfarid
ID: 24205926
yes, it will cause problem since if two or more take the same ip address then this will confuse the arp tables on the systems on the same network including the router. Also all will attempt to reply to incoming traffic, etc.
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Author Comment

by:Teleswitch
ID: 24205942
Just to clarify. Theses are two different clients who are using Virtual IPs for redundancy, but they are attached to the same layer 3 switch.  I don't think the switch would be able to route the packets.
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Expert Comment

by:omarfarid
ID: 24206004
but if these systems are supposed to talk to other systems on other networks then they need router. Also, when some other system try to resolve ip to mac address these 2 systems will reply!!!
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Author Comment

by:Teleswitch
ID: 24206099
Thanks for getting back to me so fast!
Here is the run down on whats happening.  We run a colocation and sell bandwidth to clients / public IPs. Our switch connects direclty to our service provider nad they handle all the routing. I have a client that is claiming that some one is stealing his IP addresses because his system goes down. This network was setup with a full class C (no subnetting) and the default gateway of .1, but thats a whole nother issue. The problem I ran accross today is that this client and another one are using the same range of IP addresses as Virtual IPs.  Could this be causing his problems?

T
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Author Comment

by:Teleswitch
ID: 24206129
We run a colocation and sell bandwidth / public IPs to clients

sorry for the bad typing
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Expert Comment

by:omarfarid
ID: 24206139
How is the connection between these two clients? are they connected to the same lan / vlan? If you can provide a network diagram
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Author Comment

by:Teleswitch
ID: 24206362
Yes, they are on the same VLAN. The entire Class C is one VLAN.
Network-Diagram.pdf
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Author Comment

by:Teleswitch
ID: 24206375
We have a total of 20 clients on 3 Class Cs, but I only show the two on the diagram to make it simple.
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Accepted Solution

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omarfarid earned 2000 total points
ID: 24206806
if the clients' systems are on the same vlan the definitely it will cause conflict and you should force them to use different ips.
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Author Closing Comment

by:Teleswitch
ID: 31573330
Thank you for your help!! Common sense was tell me that it was a problem, but I needed to confirm.
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