Debian has a customization to udev that will keep network interface names persistent after hardware changes and reboots. Normally this is what you want and you will not care about this, but there are cases where this can be very annoying and we just have to disable it. I am speaking about situations when you will copy the files from a system and use them to recreate a new system, or when using some virtualization tools and cloning your vm; these situations will always result in network problems caused by the udev persistent rules.

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A while ago, I have linked an interesting story about the ethereal name change to wireshark. If you are a tethereal user (the console version of ethereal) and using Debian testing (like I am) you will notice that the Debian developers have pushed the new version with the changed name into Etch repositories. If for ethereal the correspondent is wireshark, for tethereal this is tshark (and not twireshark as you might have expected).
When you will install the new version this will remove the ethereal package and we will remain with wireshark.

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