Re: syslog and network management

[Roel Jonkman <naj_foleor () yahoo com>]

All,

UDP checksum is optional, if the checksum field is 0, there is no checksum.

                      roel

----- Original Message ----
From: Paul D. Robertson <paul () compuwar net>
To: Firewall Wizards Security Mailing List <firewall-wizards () listserv icsalabs com>
Sent: Thursday, March 13, 2008 9:43:14 AM
Subject: Re: [fw-wiz] syslog and network management

On Mon, 3 Mar 2008, Darden, Patrick S. wrote:

> 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.

First, Cisco routers drop UDP on overlaod before they drop TCP, so if your 
log server isn't on the same subnet, that may mean TCP is a better choice 
if you're getting flooded.

Second, it depends on your buffers with TCP, but at least you'd know on 
the receiving end that you're dropping packets.  With buffer tuning, you 
may be able to withstand flooding the log server and catching up again.

Third, I'm pretty sure the RFCs say that UDP must default to checksumming 
packets.


Paul
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