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I understand haproxy should have one NIC for the incoming traffic and another one facing the web servers. But since all my servers are on a public networks exposed to internet, could I sue a simple dedicated server with only one NIC? The main question is: haproxy's performance will be affected from this?

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haproxy's performance will only be affected if you clog the NIC; otherwise it'll work just fine.

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what clog the NIC means? – rtacconi Aug 1 '11 at 10:47
Utilise all the available bandwidth. – womble Aug 1 '11 at 12:12
You can also "clog the NIC" with large numbers of small packets, and still have bandiwdth available. This could manifest itself as a large number of interrupts on the device, and might be common in an application where there are many small requests and replies (such as a RESTful web servies). – rmalayter Aug 1 '11 at 14:30

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