RAM needed for DHCP + router?

Gary Gatten Ggatten at waddell.com
Fri May 27 00:59:58 UTC 2011

Your biggest consumers would be FBSD itself and the routing tables. I *think* full internet routing tables are still less than 512MB, (google to check), so unless you have more routes than that - 512MB may work, 1GB most likely will.  Too many unknowns, like; is this ipv4 only or 6 and 4 routes? Tweaked/minimal kernel, etc.

----- Original Message -----
From: Chris Hill [mailto:chris at monochrome.org]
Sent: Thursday, May 26, 2011 06:46 PM
To: FreeBSD Questions List <questions at freebsd.org>
Subject: RAM needed for DHCP + router?

Hello list,

I'm looking to build a NAT / DHCP box for a lab network for my company. My 
question is, how do I estimate the amount of RAM the machine will need?

This box will be running isc-dhcpd, doing NAT either via natd or pf, and 
not much else. I expect the amount of traffic (throughput) to be very 
small, but the address space involved is quite large, at least by my 
standards. It seems to me that this will require potentially large amounts 
of memory for routing tables, etc., but not much disk.

I'll be installing the latest -RELEASE; 32-bit if I can, 64-bit if I must, 
depending on how much memory it looks like I'll need. I may also install 
webmin for the benefit of my computer-literate-but-not-unix-savvy 


Chris Hill               chris at monochrome.org
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