failover - reserved address
dhcp1 at thehobsons.co.uk
Thu May 21 08:52:12 UTC 2009
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
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.
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