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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