Hello,
within radsecproxy.conf you can add simple rewrite rules with

   "addVendorAttribute <vendor>:<attribute>:<value>"
  
Within a posting from 2010 I found the following explanation:
"with all numerical values just like with the other attribute configuration options."

but "value" is a string in fact

i.e.:
   
   rewrite miktest {
           addVendorAttribute 14988:27:2000
           addVendorAttribute 14988:26:0
   }


   - When I radtest with a client (with freeradius) I get:

   Received Access-Accept
   :
   Mikrotik_Wireless_VLANIDtype = 842018864
   Attr-26.14988.26 = 0x30

   => So, the number 2000 is transformed into 842018864 and 0 is transformed into 0x30.

   (Looking at /usr/share/freeradius/dictionary.mikrotik:
   ATTRIBUTE       Mikrotik_Wireless_VLANID                26      integer
   ATTRIBUTE       Mikrotik_Wireless_VLANIDtype            27      integer)

So I would like to pass 2000 and 0 as numbers to freeradius. How can I accomplish this? It would be great if someone could give some hints
   
Regards
Michael