[c-nsp] Anycast services

[David J. Hughes]

On 19/05/2006, at 6:15 AM, Tim Durack wrote:

> So everybody keeps saying. I know TCP is stateful, but for a web
> proxy, seems like it would work well enough. Might have to refresh to
> fix broken state, but users are used to that kind of behaviour on the
> Internet anyway.

Having your HTTP connections dynamically routed to another proxy 
instance will have a significant impact on your user experience.   If 
you are using proxy-auth then the user will need to resupply their 
credentials.  If the user is accessing a site that uses source IP addr 
in it's session mechanism (shopping cart etc) then that will break when 
your request is generated by the other proxy.

Anycast for stateless UDP based services makes great sense.  Anycast 
for TCP delivered app's makes much less sense.


David
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