November 18th, 2004

lookin' good

(no subject)

An e-mail I just sent--and copied to our entire systems team and [another clueless idiot at a large networking provider] (the e-mail prompting my rant is at the bottom)


Dear [a member of our systems team]:

I'm tired of pulling punches with these idiots. Since [a large networking provider] has proven repeatedly over the last year that they are dumber than bricks and incapable of troubleshooting network problems for themselves, let me break it down for them.

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Now, what does [the above] mean in terms of instantaneous network utilization, since I know that has been brought up as a strawman issue by [a large networking provider]? Nodes construct echo replies by reversing the source and destination headers, setting the code to zero, and re-computing the checksum. Therefore two 1700 byte are approximately 3400 bytes on the network. If those 3400 bytes were to be transmitted over the course of 79 ms we would see 344.3 kilobits in a second of non-stop echo responses and replies. That's about 22% of a T-1. (I'm excluding fragmentation overhead, network management, and other traffic from that figure--but I'm also excluding processing delays &c. that would make that true instantaneous figure lower). For one thing, the default ping client sends out one ping per second--putting us more at _ 1.8% _ of a T-1's total bandwidth from the 1700 byte ping test over time.

Can we please now put to rest FOREVER the ridiculous idea [a large networking provider] seems to have that nothing is wrong with their implementation of our network and get them down to finding and fixing their problem(s)? Thanks much.

Fed up and going to bed,

--Pete

p.s. [a large networking provider] also seems to have missed the "for a PPTP VPN" part of our static NAT request for the BFS-local PPTP VPN on [an IP address], because they are not passing GRE and therefore VPN connections fail after authentication.
--
Peter L. Thomas, Technical Director
High Performance Technologies, inc. (www.hpti.com)
Office: 973-442-6436 x246, Cell: 703-615-7806, Fax: 973-442-6402
E-mail: [my work e-mail address]
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