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Windows Server Forum / Exchange Server / Design / February 2008HUB or EDGE
We have 3 locations, 3 AD sites, internet connectivity for all users goes through one internet link in one site. Is it possible for all inbounf mail flow from the internet to go through one HUB server? and then that HUB servers forwards mail to other HUB servers depending on recipient's location of mailbox? Tnx! Yes, and that's the typical implementation (inbound to one location). Some Orgs like to leverage their multiple points of presence/internet connectivity and add additional MX records to point to additional locations. This ensures that in case of internet outage at one site, or a site outage, the rest of the Org continues to receive/send internet mail. Deploying an Edge Transort server (or other non-Exchange MTA) to route mail to/from the intenet is always recommended and certainly more secure, but many organizations do receive inbound on their Hub Transport servers as well. Once the message makes it to Exchange, it can determine which server/Site the recipient is in and routes it to the Hub Transport server(s) in the destination.  SignatureBharat Suneja MVP - Exchange www.zenprise.com NEW blog location: exchangepedia.com/blog ---------------------------- > We have 3 locations, 3 AD sites, internet connectivity for all users goes > through one internet link in one site. [quoted text clipped - 4 lines] > > Tnx! > Yes, and that's the typical implementation (inbound to one location). Some > Orgs like to leverage their multiple points of presence/internet [quoted text clipped - 8 lines] > server/Site the recipient is in and routes it to the Hub Transport server(s) > in the destination. Thank you Bharat! :) > Yes, and that's the typical implementation (inbound to one location). Some > Orgs like to leverage their multiple points of presence/internet [quoted text clipped - 8 lines] > server/Site the recipient is in and routes it to the Hub Transport server(s) > in the destination. Just one more dilema.. To provide HA, is it possible to put two HUB's in NLB cluster and inbound mail flow will be directed to CNAME(IP) of that NLB. Is it going to work? Why not use multiple MX records instead? NLB will work, though. Deployment Options for Hub Transport Servers http://technet.microsoft.com/en-us/library/bb124398(EXCHG.80).aspx SignatureBharat Suneja MVP - Exchange www.zenprise.com NEW blog location: exchangepedia.com/blog ---------------------------- >> Yes, and that's the typical implementation (inbound to one location). >> Some [quoted text clipped - 18 lines] > mail flow will be directed to CNAME(IP) of that NLB. > Is it going to work? > Why not use multiple MX records instead? > NLB will work, though. Hm...but our hub's are located in LAN, and all mail from internet can be forwarder from firewall to one internal IP located on LAN. So I thought that NLB would be HA solution. I don't understand that with multiple MX records. It makes sence when hubs have internet IP's, right? Correct me if I'm wrong... You're right - if you have a single IP address available.... you can use NLB and publish the NLB IP address. SignatureBharat Suneja MVP - Exchange www.zenprise.com NEW blog location: exchangepedia.com/blog ---------------------------- >> Why not use multiple MX records instead? >> NLB will work, though. [quoted text clipped - 7 lines] > > Correct me if I'm wrong... Hi Bharat! I was under the impression that High Availabillity for Hub Transport Servers, HT, is provided by Active Directory and also if Hub Transport and Client Access Server, CAS, is colocated on the same server and you load balance CAS you should disable NLB for HT (port 25 - SMTP). So, you say I can NLB both CAS and HT? Jesper Bernle | Enterprise Messaging Administrator > You're right - if you have a single IP address available.... you can use > NLB and publish the NLB IP address. [quoted text clipped - 11 lines] >> >> Correct me if I'm wrong... The way I look... NLB in this case would be HA option for iternet inbound mail flow when you have no Edge servers, and all incoming mail is forwarded through firewall to one local IP...so to provide HA for hubs, NLB is solution HUB HA for outbound is provided by Active Directory. right? > Hi Bharat! > [quoted text clipped - 6 lines] > > Jesper Bernle | Enterprise Messaging Administrator True - as Lehr stated. You shouldn't use NLB for internal mail delivery - the doc link I posted earlier covers that. As of SP1 (iirc), you can use NLB to load-balance mail delivery as you intend to do. SignatureBharat Suneja MVP - Exchange www.zenprise.com NEW blog location: exchangepedia.com/blog ---------------------------- > The way I look... > NLB in this case would be HA option for iternet inbound mail flow when you [quoted text clipped - 17 lines] >> >> Jesper Bernle | Enterprise Messaging Administrator Okay. Good to know. :-) Jesper Bernle | Enterprise Messaging Administrator > True - as Lehr stated. You shouldn't use NLB for internal mail delivery - > the doc link I posted earlier covers that. As of SP1 (iirc), you can use [quoted text clipped - 22 lines] >>> >>> Jesper Bernle | Enterprise Messaging Administrator |
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