I'd like to understand this too. I thought we didn't want to try & do things in RADIUS that are not supported in Diameter.
The RADEXT WG charter requires that Diameter compatibility issues be examined as part of each work item. Extending the RFC 3588 NAS-Filter-Rule syntax does bring up Diameter compatibility issues. This was pointed out in Issue 130, which was filed in August 2005.
As I understand it, the DIME WG is being chartered to produce RFC 3588bis, so one possibility is that they will consider a NAS-Filter-Rule syntax revision as part of that effort.
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