Is there a specific reason why an Exchange Server should have 2 NIC cards

Hi as a part of my troubleshooting efforts on the Exchange Server on the network, I found that it is equipped with 2 NICs and both the connections are enabled and active.

One of them has a static address while the other is configured to get an address automatically.

Can someone tell me the reason why. One site on the internet mentioned something about IAS Server. Does it have anything to do with IAS.

Also this server needs a restart every 3-4 days. Could the dual NICs be the culprit?

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Aaron StreetConnect With a Mentor Infrastructure ManagerCommented:
we have two nics on our serrver.

one is on the Local LAN for email traffic. the second nice sits on a seperate Vlan, with a private IP address and is used to back up the server.

this way backup data does not interfear with the live data. (there is of course the issue with processr usage and disk access when backing up a live server but thats a different probelm)

there could be many resons for it. however generaly having two nics is to incress proformance by doubeling the bandwith. or to allow access to two seperate networks that are not routable between.
smckellar83Connect With a Mentor Commented:
if it is strictly an exchange server, there is no reason for 2 nics. The only reason I would enable 2 nics on an exchange server is to bridge them and get the benefits of double the bandwidth. as for rebooting every few days, it's unlikely.

If ISA was running in integrated mode you would need 2 nics
georjkuruviAuthor Commented:
Thanks for your comment.

Could you elaborate on "If ISA was running in integrated mode you would need 2 nics"

What is integrated mode?...Why does that need 2 NICS

Erik BjersConnect With a Mentor Principal Systems AdministratorCommented:
What are the IP settings for the 2 NICs?  Are they in the same or different subnets?  If they are in different subnets then this exchange server may be serving more than one network (say external and internal conection) and that is why there are 2 NICs.  That being said that is not the best way to setup an exchange server.

As for the restart every 3 - 4 days, what prompts the need to restart?  Anything in the event log?  This could be a different problem all to gether.

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