RE: location of DHCP lease files

[Dan Williams <dcbw redhat com>]

On Tue, 2008-11-04 at 13:52 -0500, Miner, Jonathan W (US SSA) wrote:
> I understand the need for multiple lease files, based on network.
> 
> My concern was the two different directories being used.  I was trying to solve a network problem, and couldn't understand why my lease files were several months old... Then I discovered that NM was putting lease files somewhere else.
> 
> Persistence across boots would require some cooperation with the DHCP server, which, in my case, may give me a new IP each time I boot. (It's some 3rd party, Windows based DHCP/DNS "solution", which I don't manage)

I'm not opposed to switching back to where dhclient really puts them if
that works better for people.  I think the original reason to put them
in /var/run _was_ to blow them away on reboot, but since there's a lot
of suspend/hibernate going on these days thats no longer valid.

Dan


> - Jon
> 
> 
> -----Original Message-----
> From:	Dan Williams [mailto:dcbw redhat com]
> Sent:	Tue 11/4/2008 1:41 PM
> To:	Miner, Jonathan W (US SSA)
> Cc:	networkmanager-list gnome org
> Subject:	Re: location of DHCP lease files
> 
> On Tue, 2008-11-04 at 11:47 -0500, Miner, Jonathan W (US SSA) wrote:
> > Hi -
> > 
> > I've noticed that the native Fedora "ifup-eth" script puts its lease files into
> > 
> > /var/lib/dhclient/dhclient-${DEVICE}.leases
> > 
> > but, NetworkManager puts the lease files into
> > 
> > /var/run/dhclient-${DEVICE}.lease
> 
> Correct.  NM uses different lease files because in the near future,
> we'll want to use separate lease files for _each connection_.  Since
> many machines move around, it's pretty pointless to use the same lease
> file for your home AP as for your work AP.
> 
> What happens right now is that you'll get a lease from work, dhclient
> will cache it, and then when you come home it'll try to renew that work
> lease at home, leading to DHCP lag.  That's bad.
> 
> So even if the lease files _did_ stay in the same place as dhclient puts
> them, you'd have a lot more lease files anyway.  But, once we modify NM
> to handle leasefile-per-connection, we should probably move them back
> to /var/lib/dhclient just to they are persistent.
> 
> I assume you're worried about persistence of the lease across boots?
> 
> Dan
>  
> 
> 
> 
>