[ntp:questions] Interface IP address Change.

Danny Mayer mayer at ntp.isc.org
Sat Jul 5 03:30:16 UTC 2008

David Woolley wrote:
> Danny Mayer wrote:
>>> Interface addresses aren't supposed to change, not just for ntp.  You 
>>> will probably also confuse named.
>> No, named has handled that for a very long time.
> The named I have had had for less than a very long time won't even 
> detect an interface going from down to up with the same address until 
> the next time it scans for new interfaces.  I sometimes have to do rndc 
> reload to get connectivity back.

Then there must be something very wrong with your configuration. I was 
testing this at one time during the development of the code and I assure 
you that it does work and has always worked in BIND9.

>> Well operated ISP's and companies will change your IP address from time 
>> to time. Even my office network will change my IP address on my laptop 
>> even though it will renew my existing address if it's available.
> They should not, because a client that is up should renew the lease long 
> before it expires.  Even if the machine is offline, leases should be set 
>   long enough to cover most normal offline time.

I move around in the office and our network is divided into different IP 
address zones. I get a new address when I move to a different zone. When 
I get back to my own office there is know way that my laptop will 
remember what it was previously using. Don't expect the DHCP server to 
do so.


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