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We are setting up XenServer machine with several VMs for our ecommerce business. We are intending to distribute services across several VMs (1 for web, 1 billing, 1 email, etc.)

The XenServer machine has 2 NICs.

My question is should we be using a public IP for each VM and rely on IPTables for firewall security, or should 1 NIC to devoted to management and the other for a virtualised firewall application such as Untangle, and route the VMs through there?

Thank you for any help

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I have been using xen for quite a while. I think you go with multiple public ip address so you can quickly monitor each service that those vms run.

Also a note: I have virtualized a production mail server and it turned out bad and sluggish.

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Thanks jmazaredo. The server only has 1 NIC but multiple IPs. I assume I can set this up in XenServer rather than relying on a firewall? –  Joseph Gardner Apr 3 at 13:44
    
Yes. You can setup this on the xenserver or directly on the vms vi bridge. –  jmazaredo Apr 4 at 13:40

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