prevent ip conflict in dhcp client

s m sam.gh1986 at
Thu Jul 11 11:18:56 UTC 2013

thanks Eugene,
you're right but i forgot to say that my client acts like a router. i mean
none of interfaces should have ip address in same range (this is conflict
for me). i can manage each interface to get ip address from DHCP or
manually. so one interface may get ip address from dhcp server whereas all
others have ip addresses which are set manually.
for this situation, do you have any ideas to avoid ip conflict?
thanks again for your attention

On Thu, Jul 11, 2013 at 3:06 PM, Eugene <genie at> wrote:

> Hi Sam,
> Actually I think this is wrong approach. Correctly configured networks
> should be consistent and should not need such 'fixes'. Also you should
> observe the IP provided by upstream DHCP server otherwise it is an
> invitation for trouble (both technical and possibly legal).
> Are the 'other' interfaces in your internal networks? Then you should
> change them to use different address block from that used in your
> provider's network (there are many address blocks for private networks).
> And/or you should talk to your admin and discuss the address policy, maybe
> they can give you a fixed address.
> Best wishes
> Eugene
> -----Original Message----- From: s m
> Sent: Thursday, July 11, 2013 2:19 PM
> To: freebsd-questions
> Subject: prevent ip conflict in dhcp client
> hello all
> i have a question about dhcp client. i want to know if there is any way to
> understand the ip address which is offered by server before it assigned to
> the interface.
> i have a freebsd system which one of its interfaces should get ip address
> from dhcp server whereas other interfaces have ip addresses and their ip
> address change many times. so i want to prevent ip conflict.  is there any
> way to prevent ip conflict in this situation?
> i think the best way is to know the ip address which is offered by dhcp
> server before assigning it to interface  and check if it has conflict with
> others or not. is it possible? if yes, how i can do this?
> any comments or hints are appreciated.
> thanks in advance
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