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Re: [RAM] Tunnelling Route Reduction Protocol

To: William Herrin <bill at herrin.us>
Subject: Re: [RAM] Tunnelling Route Reduction Protocol
From: Brian E Carpenter <brian.e.carpenter at gmail.com>
Date: Wed, 22 Aug 2007 10:32:38 +0200
Cc: Robin Whittle <rw at firstpr.com.au>, ram at iab.org
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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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Follow-Ups:
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References:
- [RAM] Tunnelling Route Reduction Protocol
  - From: William Herrin
- Re: [RAM] Tunnelling Route Reduction Protocol
  - From: Robin Whittle
- Re: [RAM] Tunnelling Route Reduction Protocol
  - From: William Herrin

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