[syslinux] dhcprelease in pxelinux

[Luciano Miguel Ferreira Rocha]

On Mon, Dec 06, 2004 at 08:46:13PM -0500, Rajeev Agrawala wrote:
> 
> 
> >From: "H. Peter Anvin" <hpa at zytor.com>
> >To: Rajeev Agrawala <rajeevagrawala at hotmail.com>
> >CC: syslinux at zytor.com
> >Subject: Re: [syslinux] dhcprelease in pxelinux
> >Date: Sat, 04 Dec 2004 12:16:07 -0800
> >
> >Rajeev Agrawala wrote:
> >>Can you please point me to RFC and relevant section regarding this. I am 
> >>in a situation where all machines boot using PXE but after local boot 
> >>switch to static IP address and I don't have enough dynamic address on 
> >>subnet to reboot all the machines.
> >
> >DHCPRELEASE means "I'm done with this address, permanently" which might be 
> >correct in your case but your configuration definitely is in the minority. 
> >In fact, for people using ipappend it is not just discouraged but actively 
> >wrong.
> 
> Yes, I understand my configuration would be in minority, but I can't 
> convince my management to use DHCP while booted in Linux :-(. I am not 
> using ipappend. The OS is statically configured with an IP address.
> >
> >It would definitely be better if you could get your DHCP server to service 
> >the public addresses; if not, I would suggest having the OS send 
> >DHCPRELEASE at OS boot time (typically before configuring the static 
> >address) by going though a DHCP request-release cycle; dhclient can do 
> >this, for example (dhclient -1 && dhclient -r).
> >
> 
> OS sending DHCPRELEASE is an option. But would be great if pxelinux could 
> do it as part of LOCALBOOT option. If the Locally boot OS needs an IP 
> address, it is going to do a DHCPDISCOVER/DHCPREQUEST anyways.

Can't you use two networks? A private network for dhcp booting, the
other for the fixed IP addresses?

Regards,
Luciano Rocha