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Re: [RAM] Tunnelling Route Reduction Protocol

Brian E Carpenter <brian.e.carpenter@gmail.com> Wed, 22 August 2007 08:32 UTC

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Date: Wed, 22 Aug 2007 10:32:38 +0200
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
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To: William Herrin <bill@herrin.us>
Subject: Re: [RAM] Tunnelling Route Reduction Protocol
References: <3c3e3fca0708200646j391fd621n568f2b791c93a36f@mail.gmail.com> <46CA50F0.2040001@firstpr.com.au> <3c3e3fca0708210630r7d559c6fk94bc38c1aaa68df7@mail.gmail.com>
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On 2007-08-21 15:30, William Herrin wrote:
...
> 
> 1. 99.9% of the time, the originator of the packet has already had to
> do a DNS lookup or some other lookup to map a name to an IP address.
> Doing another lookup for that first connection attempt leaves us in
> the same ballpark speed-wise.

Wouldn't that be 49.95%? Half of all first packets tend to be
responses such as SYN/ACK that involve no DNS lookup. For a server
handling thousands of requests per second, adding a lookup means
holding thousands of TCBs in a wait state for the duration of the
lookup. There are perhaps some interesting DDOS attacks there.

    Brian

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