Re: [CARD Techical Issue] Rate limiting flag

Hi James,

just a quick example of the use of flag bits: ECN-bits with TCP.

Jukka

On Tue, 1 Jul 2003, James Kempf wrote:

> Last paragraph in in introduction to Section 4 says that the R flag is used
> by the router to indicate to the MN to reduce sending rate of messages. As
> far as I know, this type of rate limiting is not done in any other IETF
> protocol (but I may be missing it).
> 
> Typically, there are two ways that IETF protocols rate limit that I am
> familiar with:
> 
>     - by specifying a constant intermessage time which clients are required
> to abide by
>     - by having the server (router in this case) drop packets selectively
> when traffic gets too heavy
> 
> The former works for well-behaved hosts, the latter reduces the impact of
> DoS attackes.
> 
> Is there something about CARD that recommends this approach rather than a
> standard IETF protocol approach?
> 
>             jak
> 
> 
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