Max length for User-Name

[Joe Friedeggs]

Pertaining to User-Name, RFC2865 states in section 5.1:


    0                   1                   2

    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
   |     Type      |    Length     |  String ...
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-

   Type

      1 for User-Name.

   Length

      >= 3

   String

      The String field is one or more octets.  The NAS may limit the
      maximum length of the User-Name but the ability to handle at least
      63 octets is recommended.



which recommends 'at least' 63 octets, but I see the sql (ver 2.2.6 with postgresql) set the limits the UserName to 'at most' 64 characters:



CREATE TABLE radcheck (
        id              SERIAL PRIMARY KEY,
        UserName        VARCHAR(64) NOT NULL DEFAULT '',
...



It seems to me the limiting factor of the User-Name here should only the 'length' field, which is one octet, therefore limiting the User-Name string to 255 charaters (minus overhead?).  Why is the UserName in the table limited to 64 characters?  What is the reasoning behind this?  Is there some other limiting factor?  I have a case where we need to use longer user names.


Thanks,

Joe