Re: [fw-wiz] syslog and network management

UDP is a LOT faster than TCP. No ECC so it uses less cpu, less memory, and has less of a memory footprint. If you were dropping a lot of UDP, then TCP would not help at all--you would receive less, just more reliably.

NG is a great app. Not sure why it failed you. Good idea to try a different syslogd.

You state that you switched to regular syslogd with async file io--was the file io set to async with NG also? If it starts happening again try:

vmstat 5 (show disk activity every 5 seconds, io contention, # writes, etc.)
top (let you check cpu activity, ram, top apps, etc.)
netstat -i (check for errors, overruns, and overall activity)



-----Original Message-----
From: firewall-wizards-bounces@xxxxxxxxxxxxxxxxxxxxx
[mailto:firewall-wizards-bounces@xxxxxxxxxxxxxxxxxxxxx]On Behalf Of
Sent: Saturday, March 01, 2008 2:07 AM
To: Firewall Wizards Security Mailing List
Subject: Re: [fw-wiz] syslog and network management

On Thu, 28 Feb 2008, ArkanoiD wrote:

Hmm, did you try tcp transport (if your router does support it)?
It might be better..

the sending devices did not support tcp transport, but there is not much
of an excuse for a program who's purpose is receiving logs to do so poorly
at it. if it's missing so many UDP packets that the OS is overflowing it's
buffers and dropping them than it's going to do bad things to the tcp
dataflow as well. the difference is that now you are able to rely on the
sender to act as a buffer as well. but that leaves your logs where you
don't want them, eating up resources on the sender while being vunerable
to disruption.

David Lang

On Tue, Feb 26, 2008 at 02:12:51PM -0800, david@xxxxxxx wrote:

We were logging 6 PIXen as well as many switches and routers (and a
much lesser level). We never "noticed" a great loss of messages... I
guess I can assume you did, and maybe I could learn from how you did!

What daemon do you use?

we tried to use syslog-ng to receive activity from our border router and
write a copy locally (in large chunks) and relay the logs to another
syslog server inside.

we noticed a LOT of missing logs, when we changed to the default debian
syslogd we were able to handle an order of magnatude more logs without any
sign of missing logs (from around 100/sec to >1000/sec)

firewall-wizards mailing list

firewall-wizards mailing list
firewall-wizards mailing list