"real mirror" doesn't imply a public mirror; it just implies a complete mirror that includes intrepid and intrepid-updates (and in this case, intrepid-proposed). As Colin says, you can use the packages from the DVD to /start/ the mirror; but you need to have a full set of updates on your mirror, not just the set of packages on the original DVD.
netllama,
"real mirror" doesn't imply a public mirror; it just implies a complete mirror that includes intrepid and intrepid-updates (and in this case, intrepid-proposed). As Colin says, you can use the packages from the DVD to /start/ the mirror; but you need to have a full set of updates on your mirror, not just the set of packages on the original DVD.