Re: DNS based Destination Selection

[Jay Ford <jay-ford@uiowa.edu>]

On Thu, 19 Jun 2003, Cedric de Launois wrote:
> > My quick reactions:
> >    o  DNS is too high a level for (srcaddr,dstaddr) selection;
> >       not everything goes by name
>
> Indeed. We thought of this mechanism in the NAROS solution. We perfomed
> recently a quick evaluation of this solution (use of DNS to influence
> an external source's destination decision making). First results
> clearly show this is too high level : 70 to 90% of the traffic
> flows we analyzed were NOT preceeded by a DNS request ! (This
> is only an approximation since it is hard to see which DNS request
> is associated with which flow). This is due to the spread of p2p
> applications : lots of flows without any DNS lookup.

Wow.  I wouldn't have expected the no-preceding-DNS percentage to be that
high.  I guess I was more right than I knew.  ;^)

________________________________________________________________________
Jay Ford, Network Engineering Group, Information Technology Services
University of Iowa, Iowa City, IA 52242
email: jay-ford@uiowa.edu, phone: 319-335-5555, fax: 319-335-2951