Re: load balancing metrics

There are many metrics for a service group.
For Application Redirection, these metrics have different algorithm
with SLB.

Minmisses : When minmissesis specified for a real server group
performing Application Redirection, all requests for a specific IP
destination address will be sent to the same server. This is
particularly useful in caching applications, helping to maximize
successful cache hits. Best statistical load balancing is achieved when
the IP address destinations of load balanced frames are spread across a
broad range of IP subnets.

Hash: For Application Redirection, all requests for a specific IP
destination address will be sent to the
same server. This is particularly useful for maximizing successful
cache hits. The hash metric should be used if the statistical load
balancing achieved using minmissesis not as optimal as desired.
Although the hashmetric can provide more even load balancing at any
given instance, it is not as effective as minmisses when servers leave
and reenter service.

So,. I think you might misunderstand the algorithm of metrics between
SLB and Applicaiton Redireciton.
For your case, if you use sip, sport, or sport + dport for algorithm,
the bandwidth of your Internet access and resource of a proxy server
will be consume rapidly because each proxy server has to access the
same content on the Internet everytime when a client wanna access a
resource which was cached by another proxy server.

cconnell_1@xxxxxxxxx wrote:
Hi,
We currently load balance proxy servers on the alteon, in transparent
mode so traffic flow generally goes

client--> alteon(inport filter
redirect)-->-proxy(in)--proxy(out)-->-alteon--->internet
internet-->alteon(filter
redirect)-->proxy(out)-->proxy(in)-->alteon-->client

The filters redirct tcp traffic to the real server group. And the
stickyness is acheived by setting thash sip, and dip, and the hash
metric.

This ensures all client sessions with the same ip go through the same
proxy(there are 3 proxy real servers)

My question is can we load balance by another way (not IP stickyness)
but achive session sticyness on the the same proxy, maybe bye using
sport, dport hash or something?

I know that cisco css firewalls use sport+dport hash and therefore give
a better load balance.
Thanks

.

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