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Using Secondary IP Addresses

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By Ryan Seale

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Posted: 23 Oct 2003
 

Problem: Moving Email servers around and changing configurations can cause problems. MX records and External DNS records always take a while to update and this will cause extra planning by the server administrators or downtime.

Solution: Using secondary IP addresses, all client access and MX records can point at "floating" IP addresses that can easily move from one NetMail server to another. All that is required is to pick a secondary ip address, add it to the server that can support the appropriate protocols, and it should work.

*It has been recommended to add this new ip address to the trusted hosts list, but since the adapter using the address should already be in the list, I don't believe it's required. Be sure to edit the autoexec.ncf files appropriately so the server will add the secondary ip back after reboot.

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