From: Church, Chuck (cchurch@xxxxxxxx)
Date: Tue Apr 30 2002 - 09:39:17 GMT-3
Guy,
Most recent DHCP servers have the option of pinging a prospective
address before giving it out. Set what you consider your 'primary' DHCP
server to ping once, and the other maybe 2 or 3 times. That way the
'primary' will always respond quicker.
Chuck Church
Sr. Network Engineer
CCIE #8776, MCNE, MCSE
US Tennis Association
70 W. Red Oak Lane
White Plains, NY 10604
914-696-7199
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Michael Snyder
Sent: Monday, April 29, 2002 11:43 PM
To: 'Lupi, Guy'
Cc: ccielab@groupstudy.com
Subject: RE: DHCP redundancy
You just defined how dhcp works. Assign half of your dhcp pool to one
dhcp server, and the other half to dhcp server two. For Example, pools
.50-.124 and .125-.199
It makes no difference which responses faster. Assuming that one server
is faster than the other, it will run out of address, and then stop
issuing valid lease offers, while the slower of the two will continue to
issue valid lease offers. Remember even if the client gets two valid
lease offers, it will only take one of them, and turn the other down.
Note - The client will always try to renew the lease with the dhcp
server that issued the lease.
I wouldn't try to overlap the pools. If you need that many addresses,
it's time for a new subnet. Having more that a 100 computers on one
flat network is about the limit anyway.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Lupi, Guy
Sent: Monday, April 29, 2002 8:04 PM
To: 'ccielab@groupstudy.com'
Subject: DHCP redundancy
Let's say you have 2 routers on an ethernet network, and both of them
are
running a dhcp server for the same network. As far as I know, whichever
router responds with an address first is the one that the client is
going to
take. Is it safe to say that the ping characteristic of the dhcp server
on
the router is enough to assume that the 2 routers will not assign
overlapping addresses? I want to make sure that if I come across a
situation in the lab where I decide to use this I can do it knowing that
it
would work in the real world. Or is there a way to configure each
router to
hand out half of the addresses so there is no overlap, and then
configure it
so that if one router can't fulfill the request it relays the request to
the
other router? Thanks.
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 10:58:22 GMT-3