Re: packet loss

[Matt Kettler <mkettler () evi-inc com>]

At 10:13 AM 9/28/2004, Larry Wichman wrote:
> In the course of my testing of Snort I have averaged about 40% packet 
> loss. I am running Snort on Fedora. The segment I am monitoring is 100 mb 
> and is very busy. Does anyone have any recommendations for tuning Snort to 
> not drop so many packets? Is there any recommendations for hardware? The 
> CPU is running at about 40% and the memory looks fine.

First, I'd make sure your setup is reasonably optimized.

What logging modes are you using? switching to tcpdump or unified packet 
logging is a HUGE improvement from the default plain text-mode logging.


Then some simple low-cost hardware checks:
Are you digging into your swap partition, or do you have sufficient ram?

What kind of NIC are you using? A Realtek RT8139 is a popular, but very 
inefficient network controller. Look into something with more efficient DMA 
alignments (Dec tulip, Intel eepro, etc). The newer gigabit realtek 8169 
part is fairly reasonable from what I hear, but I've not tested it.




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