How to identify a client?

[Sten Carlsen]

I have a similar situation, but with a few differences. I hope this 
could be an inspiration.

I have made a host entry for each of the MACs (wired / wireless)they are 
each given the same IP, that works without any problem. I can even 
continue a download while switching form wired to wireless.

The other thing I have tried is to have a host entry with a  option 
dhcp-client-identifier. IIRC this also works.

Tom Schmitt wrote:
> Hi,
>
> I'm running ISC-dhcpd which is running fine. I use dynamic DNS-Update which is also working fine and the TXT-record the dhcpd adds in the DNS makes sure, nobody else will occupy this name while the lease is lasting. The leasetime is one day in all subnets.
>
> So far, so good.
>
> Now I have besides all my normal subnets a few WLAN-subnets, also using DHCP. And of course there are Clients switching from a normal subnet to a WLAN-subnet and back. 
> And now comes the problem: In the WLAN the client is using another MAC (the one of the WLAN-card instead of the normal NIC) but the same name. So, if a client was first in a normal subnet, getting a lease and a DNS-entry, then the client is moving to a WLAN-subnet and comes with the same name but differrent MAC to the DHCP. The clienst is getting a new IP but no entry in the DNS because there is already an entry and the TXT-records says: Its not yours!
>
> So, for the time the old lease is valid, the client has no DNS-entry.
>
> What can I do to solve the problem?
> The only thing I could think of, was a shorter leasetime. But this is problematik for several other reasons. Abd beside: It wouldn't solve the problem, only make it happen fewer times than with a longer lease.
>
> Is there a best practice to avoid this problem? Do anyone else have the same problem?
>
> Bye,
> Tom.
>
>   

-- 
Best regards

Sten Carlsen

No improvements come from shouting:

       "MALE BOVINE MANURE!!!"