Can dhcpd4.1-p1 Communicate with dhcpd3.1.3?
Glenn Satchell
glenn.satchell at uniq.com.au
Mon Nov 1 11:16:24 UTC 2010
On 11/01/10 01:13, Martin McCormick wrote:
> We want to transition from Version 3.1.3 to 4.1 without
> loosing our lease data base.
>
> There are presently two servers in the usual failover
> pair and the idea is to switch out the secondary first. It
> appears to be happy with the dhcpd.leases file so what would
> happen if we brought down the existing 3.1.3 secondary and then
> replaced it with the new 4.1 secondary? Would they sync up?
> Would the new secondary at least honor the existing leases? That
> would be good enough since the public would not have the chaos
> that results when the lease data base is lost.
>
> The plan is to replace the primary when the new
> secondary is functioning so there is no loss of lease
> continuity.
>
> Thank you for any suggestion.
>
> Martin McCormick
It is strongly recommended to run the identical version of dhcpd on both
failover peers all the time. There is no guarantee that the failover
protocol is compatible between different versions, and there was a
significant change about that time.
This is from the dhcpd.conf man page, please note the last sentence:
DHCP FAILOVER
This version of the ISC DHCP server supports the DHCP fail-
over protocol as documented in draft-ietf-dhc-failover-
12.txt. This is not a final protocol document, and we have
not done interoperability testing with other vendors' imple-
mentations of this protocol, so you must not assume that
this implementation conforms to the standard. If you wish
to use the failover protocol, make sure that both failover
peers are running the same version of the ISC DHCP server.
The lease file and dhcpd.conf should be completely compatible between
versions, so the suggested process is to shutdown both instances of
dhcpd, install the new software and start them up.
The only systems that should notice this are new systems booting up that
have not got an existing IP address. Renewing clients will just try
again a bit later, without losing their current IP address.
You can test the lease file and dhcpd.conf with the new version using
dhcpd -t and dhcpd -T.
--
regards,
-glenn
--
Glenn Satchell | Miss 9: What do you
Uniq Advances Pty Ltd, Sydney Australia | do at work Dad?
mailto:glenn.satchell at uniq.com.au | Miss 6: He just
http://www.uniq.com.au tel:0409-458-580 | types random stuff.
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