Re: Comments on architecture doc, Sect. 5

[Patrik Fältström <paf@cisco.com>]

At 15.03 -0500 00-11-03, Mark Day wrote:
>  > ACCOUNTING CPGs retrieve the data from
>  > SURROGATEs that collect and store the data locally. This interior
>  > data may be collected from the SURROGATEs by ACCOUNTING CPGs using
>  > SNMP or FTP, for example.
>
>Is it always a "pull" by the CPG?  It seems reasonable that the data could
>also be deposited directly to a CPG by the interior ACCOUNTING SYSTEM.

In general, if you are able to let the decision whether this is push 
or pull being something the people operating the system chooses, that 
is a good idea.

You can _also_ allow a push/pull combination like what we used in 
Whois++ and what the notify extension in DNS uses. The server which 
have new data tell the other party that new data exists, and closes 
the connection (or equivalent). It is then up to the other party to 
pull the data itself.

This to minimize the risk of denial of service attacks on the 
receiving party in a push system.

    paf