[Techtalk] LAN IP addresses changed after router reset

[Rudy Zijlstra]

On Wednesday 14 May 2008 15:16, Wei-Yee Chan wrote:
> Berenice wrote:
> > What puzzles me is why my computers suddenly changed IP addresses. I've
> > had this router for a while and the IP addresses have remained the same
> > whenever I've restarted the router.
>
> Do you have "always on" machines that were recently shut down or
> rebooted?  If your router's DHCP function is turned on, then the router
> will simply assign IP numbers arbitrarily.  Rebooting or shutting down
> of the machines could have caused the change in IPs.

No, any decent DHCP server will not do that, as the RFC specifies that it   
should try to provide the same IP address the the client each time. For this 
reason the DHCP server normally stores the IP addresses it has handed out so 
it can know on reboot. 

>
> > The reason I prefer to have my boxes numbered 1,2,3 is that it's easier
> > to remember. I've also recently set up a samba share on the Debian box,
> > and changing IP addresses may affect it (I'm going to check the smb.conf
> > later. I don't know exactly how samba was configured because it was done
> > automatically when I installed Debian).
>
> Set your router's DHCP server to assign the desired IPs according to
> their MAC addresses.  You could refer to your manual on how to do that.
>

Many routers will not allow you to do this... This is most often found  on 
full DHCP servers, but not in the simple implementations on embedded units. 
Unless they be linux based and are using ISC dhcp  ;-) 

Cheers,

Rudy


> Regards,
>
> Wei-Yee Chan
> http://chanweiyee.blogspot.com/
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