Re: Avoiding natd overhead

First, sorry for the double post, received a message saying the first
one was rejected by a spam filter, however I now see it's on the
list! ;)

Of course you may ask for more help! First, take advantage of what's
out there, people have written some absolutely great documentation,
including the FreeBSD handbook, a reference which I have out near 24/7.
Specifically for the problem at hand though, read up on the following :
FreeBSD Handbook chapter 21, man make.conf , man make , and
http://pages.silverwraith.com/papers/6/ .

If you have the correct sources synced, refer to chapter 21 in the
handbook again if not sure. Then take the following out for a test
drive.

cd /usr/src/sbin/natd

make -DCPUTYPE=pentium4 <== I happen to have a p4, insert your correct
cpu type.

Now, make a backup of your existing natd binary, cp /usr/sbin/natd to
the location of your choice maybe /home/username/

from /usr/src/sbin/natd now type make install

do a ls -lah /usr/sbin/natd you should see a new natd binary with the
date / time you compiled it, ie recent.

Restart natd, or start it if it's not, and see how it goes!

If something goes wrong, you can always copy your backup
to /sbin/natd .


This should get you started, theres some more optimizing you can do, but
I figure start here without adding to many variables to the mix. And
just adding the CPU type to the make flags as shown above, seems to be
the single largest factor in making natd run as you would expect.

Thanks!

Chris Bowman







On Sat, 2006-10-21 at 14:41 +0100, Spadge wrote:
Chris Bowman wrote:
I see this question come up now and then
on the lists, so, I'll share
what I've learned about natd and performance! First, if your running
natd on a processor which supports more functions than just a standard
386, ie a Pentium, Athlon, etc. Then I've found compiling natd with
make flags for that processor, and with O3 optimizations will make your
jaw drop in comparison to the default installed version of natd. You
can find if you have the sources downloaded for FreeBSD the natd source
in /usr/src/sbin/natd , just recompile natd itself, or when you re-build
world for your system, make sure you have make flags set in make.conf so
everything will rebuild with optimized flags, however I don't recomend
O3 at all for a build world, will almost definately break something, for
natd itself, it works fine.

This is pretty interesting stuff, and something I'm going to have to
look into.

Could I be incredibly presumptious and ask you for some more info to get
me started on my way?

Where would I start looking for info on what make flags are available
for natd and my CPUs? I'm not seeing anything helpful in the README and
my Makefile is very short.

Thanks for any help.



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