Re: WNLB HT servers

If your line-of-business applications don't support round-robin DNS for SMTP, then you certainly can use NLB for port 25. But as I said before you should be careful what things you point to the load-balanced address.
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Ed Crowley MVP
"There are seldom good technological solutions to behavioral problems."
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"Sawyer" <Gmail@xxxxxxxxx> wrote in message news:5783C9D7-DA0A-461D-8223-47ADBE75EFF1@xxxxxxxxxxxxxxxx
Hello Ed

The main reason i need to wnlb two HT servers, is because we have some applications that need to a smtp relay to send emails to the internet and internally. If these emails are not able to be sent for whatever reason it creates a loss of revenue. This is why i wanted to get some HA around this process. I understand the out of the box load balancing part of HT servers, and i agree with what you have described in your responce to my post. However If i create a receive connector that allows smtp relay on one HT server, this does not give me HA for my line of bussiness applications that need to relay email. This is why i decided to use nlb, with this i can create two receive connectors, one on each HT server the connectors would listen on the ip that has been NLB, and the default built in connectors are listening on a different seperate ip from the nlb ip. With this solution i have HA for my applications that require smtp relay, and at the same time, i havent broke the buit in load balancing mechanisims of Exchange 2007

"Ed Crowley [MVP]" <curspice@xxxxxxxxxx> wrote in message news:OyoIcLXFKHA.1248@xxxxxxxxxxxxxxxxxxxxxxx
You do not want to load-balance the Exchange part of the traffic. Exchange does a very good job of load-balancing and failure detection through normal routing mechanisms, and Exchange servers expect to talk to individual servers, not load-balanced clusters, so that will break intra-organizaitonal messaging. In general, nearly all SMTP servers do a good job of load balancing and failure detection so there is no need to load-balance Internet SMTP traffic, either, even though that method is possible and can work. The one are that does make some sense for load balancing is port 587 client submission SMTP, since clients don't generally try multiple SMTP servers for submitting mail.
--
Ed Crowley MVP
"There are seldom good technological solutions to behavioral problems."
.

"Sawyer" <Gmail@xxxxxxxxx> wrote in message news:00D6689A-4156-4CE9-AFBF-9A9445803304@xxxxxxxxxxxxxxxx
Hello all

I have two Windows 2008 servers that are running the HT and CAS server roles. The CAS role is using WNLB, and it is working out fine at the moment. I would now like to wnlb the HT servers. Can use WNLB to load balance the HT servers? and if so can i do it when i am already using wnlb for the CAS servers?

Many thanks for any suggestions





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