yes, you can. or atleast you'd upgrade to the rpm versions that are in 4.6
you can even upgrade from 4.x to 5.x if you want...though i wouldn't reccomend it :)
it all depends on what is in the repo.
I've got whatever is in the published rhel-x86_64-as-4 channel ;)
You know if there is any details on which channels give you what?
Currently it seems you have to work it out from the listed name.
I think the way it works is that each channel has the most up-to-date (er...no pun intended ;) ) rpms for that flavor of redhat. then every quater the cut a "release" that includes all of those patches as the 4.5 or 4.6 or whatever.
so, if you are just going to point at the channel rpms, i don't think you need to worry about the version number of the redhat release - as long as the major version number is the same.
i don't think that redhat has separate channels for rhas 4.5, 4.6, etc. it's just 1 channel for rhas 4.
there are other areas you can go in the rhn site to download ISOs of just 4.5 or 4.6 if you want to patch like that vs the firehose of patches
I figured this would probably be the case. One of the T-Systems admins is on a Redhat course next week and going to ask the trainer if they can confirm this.
Do you happen to know the best way to upgrade from 4.6 to 4.8?
if you are pointed at a repo w/ all the 4.8 era rpms, up2date should just work.