Unless things have changed, there's no such thing as a online "backup"
dhcp server...

You can't have more than one dhcp server serving the same set of IP address...

What you can do is have two dchp servers each serving 50% (or 80/20 or
whatever) of the addresses in your subnet, example:
Server 1
Scope to
Exclusion to

Server 2
Scope to
Exclusion to

But you can also simply configure the scopes separately as:
Server 1 scope to

Server 2 scope to

Another option would be to configure the i's dhcp to server the same
set of address as the router, but configure it not to start. If the
router goes down, you simply start dhcp on the i.


On Thu, Apr 28, 2011 at 10:43 PM, Jim Franz <franz400@xxxxxxxxxxxx> wrote:
Have been asked if iSeries can be "backup" dhcp to the current Sonic Wall router handling dhcp. Customer needs access to iSeries, even if internet router out. This local network has 20 local pc's (dhcp), several printers w/fixed addresses, the Sonic Wall router, & iSeries - no Win Server & no spare pc. Router went down in a power outage & initially did not come back up. None of the pc's could connect to the iSeries for hours till fixed.
I know the iSeries (V6R1) supports DHCP - but asking how many use the DHCP as a 2nd dhcp in the network - any issues? Now that I think about it - this doesn't seem righ since the router inside address is the local gateway. Is a 2nd router on the switch a better idea?
Jim Franz
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