Measuring DRP-RTT in Cisco Distributed Director

[Barry Margolin]

In article <002b01bf02ba$77a15e60$8c2ebca8 at chungnam.ac.kr>,
=?ks_c_5601-1987?B?w9bDorG5?=  <ckchoi at hr.chungnam.ac.kr> wrote:
>
>In Cisco Distributed Director, measuring DRP-RTT is occurs between
>distributed servers and the client¡¯s local DNS. The reason of this is
>that there¡¯s no client¡¯s information(IP addr) field in DNS query to the
>local DNS. 
>    I think the measuring way will work well. But latency between
>distributed server and the client¡¯s local DNS is different from it
>between distributed server and the client. I guess this difference can be
>big sometimes so that the client will be connected to worth server then
>the best server. 
>    What I like to know is how I can measure the RTT between server and
>the client. (even though current measuring way doesn¡¯t be a serious
>problem in global point of view).
>Do exist any solutions or hits for my purpose?

With a Distributed Director, I think you can accomplish this by running the
DD in HTTP Redirect mode, rather than DNS mode.  In this mode, the DNS
entry for the web site points to the DD itself.  When the client connects
to the DD, it computes the DRP-RTT to the client, and then sends it an HTTP
redirect to the closest web server.

-- 
Barry Margolin, barmar at bbnplanet.com
GTE Internetworking, Powered by BBN, Burlington, MA
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