I need to move our exchange interface to put a Barracuda spam filter inline. Our current setup is: 2 vms (win2k3 stnd sp2, server1.0, on a dell 1750 with 2 nic bridged to 4 vitual nics), a front end exchange vm with an interface on the outside with a public ip x.x.94.10 with gtwy x.x.94.1, and a private ip x.x.7.30 without a gtwy, a back end exchange with a private ip x.x.7.13.
The suggestion I was given was to NAT our public ip x.x.94.10 to a private ip x.x.8.10 in our firewall. Patch outside switch to the spam filter and address it x.x.8.10. Create a dns record for the spam filter barracuda.barracudanetworks.com x.x.8.10. Change our mx record from mail.xxxx.org to barracuda.barracudanetworks.com. And flush and re-register dns.
Does this sound like a good way to go? How will this affect OWA, which we had accessed through mail.xxxx.org? Thanks.