How can I use ethtool to view and change the settings for a Network Interface Card when using the xen kernel?

Updated -

When using the xen kernel, the interface name for your Network Interface Card may be different. If your interface is usually named eth0, under the xen kernel it may be named peth0. So, to use ethtool on the first interface with the xen kernel, you can use:

ethtool peth0
...

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