Using tags (RFC2868)

Hi, I'm trying to use tags, in order to group tunneling attributes. I've tried adding them like that: Tunnel-Preference:0 += "10" Tunnel-Preference:1 += "10" But when running the radius in debug mode (-X -x), I see that the following is being returned to the NAS: Sending Access-Accept of id 74 to 213.8.9.XXX port 21693 (....) Tunnel-Preference:0 += 10 Tunnel-Preference:0 += 10 Any ideas why?