Let's talk about Distance Sniffing/Remote Visibility

Thu Mar 28 15:23:41 UTC 2002

Yeah, the device I've got in my head is a 1U server with 4 (or more?)
interfaces... not so much to simultaneously pull 400Mbps of bandwidth for
analysis but rather to just have a interface going to each switch I might
want to monitor and then span traffic to the Ethereal box. Given that I'm
trying to attain remote visibility, it might be nice not to need remote
hands to be swapping patch cords back and forth.

I'm imagining that even with a relatively speedy box, if you were trying to
do analysis from multiple interfaces you'd at least choke the disk I/O.
There's always stringent filters, I guess.

thanks for the input,
-carl

                    "E.B. Dreger"                                                                                   
                    <eddy+public+spam at noc.ever        To:     CARL.P.HIRSCH at sargentlundy.com                        
                    quick.net>                        cc:     nanog at merit.edu                                       
                    Sent by:                          Subject:     Re: Let's talk about Distance Sniffing/Remote    
                    owner-nanog at merit.edu             Visibility                                                    

                    03/28/02 09:02 AM                                                                               

"C" is close.  Not sure what you mean by "a ton of interfaces".
Most (all?) good managed switches have a "monitor port" or
"mirror port" where they can blind copy traffic from other ports
to the one that's set aside for snooping.

Four-port ethernet cards are readily available.  How many
switches do you wish to monitor simultaneously?  Even with only
four ports (more in one box is certainly possible), you can have
a fair amount of traffic to digest.

--
Eddy

Brotsman & Dreger, Inc. - EverQuick Internet Division
Phone: +1 (316) 794-8922 Wichita/(Inter)national
Phone: +1 (785) 865-5885 Lawrence

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