Keeping your fork insync with a remote

gistfile1.txt

Add the remote repo as "upstream"
git remote add upstream git@github.com:red5/red5-server.git

Get the remote repo
git fetch upstream

Ensure you're on your fork's master branch
git checkout master

Rebase with the remote master
git rebase upstream/master

Very first push of work on your fork may require -f
git push -f origin master