On Feb 22, 2007, at 3:55 AM, Frank Bonnet wrote:
I have a new mailhub with two ethernet gigabit interfaces, and I would like to transparently redirect IMAP or POP3 requests to the second interface which have a different IP address, to let the first interface drive the SMTP traffic only.

Is it possible? This will avoid thousands of email clients re- configuration to
let users grab their incomming emails.

Configuring the two interfaces with two different IP addresses is no problem at all, presuming that these IP addresses reside in different subnets. If both IPs reside in the same subnet, you are better off configuring the second IP as an alias on the first interface, and using the second NIC for some other purpose.

You can do other things, such as using ng_fec to perform "port trunking", or using IPFW or some other thing to manually force traffic out of the other interface, but it's unlikely to result in much benefit.


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