Weird apt-get update output, DiffIndex ign???

[crazytux]

Can somebody please shed a light on this:

sudo apt-get update && sudo apt-get upgrade
Password:
Get:1 http://ftp.de.debian.org stable Release.gpg [378B]
Hit http://ftp.de.debian.org stable Release
Get:2 http://security.debian.org stable/updates Release.gpg [189B]
Ign http://ftp.de.debian.org stable/main Packages/DiffIndex
Ign http://ftp.de.debian.org stable/contrib Packages/DiffIndex
Ign http://ftp.de.debian.org stable/non-free Packages/DiffIndex
Hit http://ftp.de.debian.org stable/main Packages
Hit http://ftp.de.debian.org stable/contrib Packages
Hit http://ftp.de.debian.org stable/non-free Packages
Get:3 http://security.debian.org stable/updates Release [22.5kB]
Ign http://security.debian.org stable/updates/main Packages/DiffIndex
Ign http://security.debian.org stable/updates/contrib Packages/DiffIndex
Ign http://security.debian.org stable/updates/non-free Packages/DiffIndex
Get:4 http://security.debian.org stable/updates/main Packages [41.0kB]
Hit http://security.debian.org stable/updates/contrib Packages
Hit http://security.debian.org stable/updates/non-free Packages

What does it mean the "Ign" lines?

It keeps saying that over and over with apt-get update, I never seen it before. But on etch/stable on 3 different systems I get this, whats wrong here????

[TheBigPhish]

Ok, the "DiffIndex" IIRC means that it is pulling the differential indices for that repository...to see what has changed.

and the "Ign"? Means ignore. It found something that negates it, so it is ignoring it, possibly due to the fact that there is an identical duplicate package listed in the repository listing.