How many fixed address ?

[Randy Grimshaw]

if it helps...
we have 23074 fixed-address systems in our configuration, and I don't
think we are the largest by far.
<><Randy


<><Randall Grimshaw
Room 203 Machinery Hall
Syracuse University
Syracuse, NY   13244
315-443-5779
rgrimsha at syr.edu

>>> David_Hankins at isc.org 9/8/2006 2:16 PM >>>
On Fri, Sep 08, 2006 at 03:03:03PM +0200, Anders R Gustavsson wrote:
> Hi,
> I am going to implement a dhcp server with a large number of clients.

> Maybe up to 5-6000.
> That I want to do is to use fixed addresses to mac. Like below...
> 
> host cd-i3m0010 {hardware ethernet 00:02:61:03:78:0a;fixed-address 
> 10.20.0.10;}# M110K443R2A0-0000163674
> host cd-i3m0011 {hardware ethernet 00:02:61:03:77:4a;fixed-address 
> 10.20.0.11;}# M110K443R2A0-0000163605
> host cd-i3m0012 {hardware ethernet 00:02:61:03:77:d4;fixed-address 
> 10.20.0.12;}# M110K443R2A0-0000163708
> 
> How many static mac-entries can I use with isc dhcpd server v3 ?

As many as you want.

The host records go into a hash table that has 9973 buckets (there
are separate hash tables for mac addresses and client identifiers).

The hash algorithm used is probably not the least collision
prone for mac addresses, so you'll probably get multiple
records in one bucket at ~6000, but probably not many.

It's hard to say without instrumenting the hash tables to dump
counts.

-- 
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-- 
David W. Hankins	"If you don't do it right the first time,
Software Engineer		you'll just have to do it again."
Internet Systems Consortium, Inc.	-- Jack T. Hankins