Failover on six /18 "subnets"?
dhcp1 at thehobsons.co.uk
Tue Mar 26 17:12:37 UTC 2013
"Nicolas C." wrote:
>We are about to manage six /18 "subnets" in DHCP-failover mode. Is
>anyone have feedback on failover for large networks?
>I'm a little worried by the time DHCP will need to initialize the leases
>database and I don't want these large ranges to interfere with our
>smaller subnets already in place.
This is governed by the size of the pools, not the size of the subnets - the server builds a hashed table with an entry for every possible lease it can offer. If your pools are the full /18 subnets, then I make that around 100k addresses to keep track of - and there have been reports of slow startup times when you get to this sort of scale. You wil need a fair bit of memory, and fast disks to manage that - you'll also need to address other factors, such as ensuring that logs are configured as asynchronous.
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