failover - reserved address

Pavel Mlčoch pavkamlc at
Wed May 27 09:29:07 UTC 2009

So last question is, howto use reserved leases. Isn't possible to found information about it. I read and I tried setup infinite-is-reserved; in right pool, but I don’t know how is form to say "this lease is reserved". Can You paste some example lease?

 Pavel Mlcoch.

> -----Original Message-----
> From: dhcp-users-bounces at [mailto:dhcp-users-
> bounces at] On Behalf Of Simon Hobson
> Sent: Thursday, May 21, 2009 10:52 AM
> To: Users of ISC DHCP
> Subject: RE: failover - reserved address
> Pavel Mlãoch wrote:
> >Sorry for this question, but I don't found any
> >solution for reserved leases in my case. When I
> >use reserved leases, I cannot say which
> >configuration may server sent to client. I'd
> >like create leases file by hand (script), but I
> >must say what subnet or router may be used,
> >because in static IP addresses we have denied
> >client with unknown MAC address and this we have
> >to in leases too. I think the best way is
> >declare two subnets, one with right router for
> >known clients and second with wrong router and
> >another subnet for unknown.
> Well you could continue using host declarations
> with fixed-address statements. With that, you can
> use "deny unknown-clients" to prevent unknown
> clients getting an address from your servers. You
> do NOT need failover for this, it's OK to have
> two or more independent servers offering a
> service using such fixed address statements -
> provided they all have the same config !
> If you went to reserved leases, then I could see
> a couple of ways to do what you want.
> One is to use reserved leases to tie clients to
> addresses, but still use host declarations
> (without fixed-address statemets) to make the
> clients "known".
> The other might be to use reserved leases, but
> size the pool so that there are no free leases to
> give to unknown clients. This might not work very
> well with failover which really needs a few spare
> leases or they get into a "fight" over them.
> --
> Simon Hobson
> Visit for books by acclaimed
> author Gladys Hobson. Novels - poetry - short stories - ideal as
> Christmas stocking fillers. Some available as e-books.
> _______________________________________________
> dhcp-users mailing list
> dhcp-users at

More information about the dhcp-users mailing list