32.5M dhcpd.conf with 108000 classes is parsed for 40 minutes. Is this ok?

A.L.M.Buxey at lboro.ac.uk A.L.M.Buxey at lboro.ac.uk
Fri May 15 13:33:26 UTC 2009


> subnet netmask {

ouch. thats a 256 times worse than dealing with just 1
class A.

> But seriously, I remember previous posts where allocating whole class A
> or class B address spaces cause the hash table generators to go

a couple of class B's is no issue - i hear problems with dealing
with much larger numbers.

> Finally you have 38000 real IPs with a max lease time of 180 seconds.
> Typical clients renew approximately half way through, so you need
> enough grunt to handle around 400 requests per second.

180 second lease time is crazy. 3 minute leases?  thats a 90 second
refresh on RFC clients - is that sort of address recycling etc needed?
3600 (for an hour) is reasonable on most systems...eg even wifi hotspots
as clients are usually around for that average amount of time.


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