Is it necessary to assign hostname to slave KDC in small letters for KDC propagation?

[Ken Raeburn]

On Apr 23, 2008, at 10:51, Juri Dakua wrote:
> FYI: all goes well if I assign the hostname in small letters
> (testslave), create the host principal accordingly
> (host/testslave.techmbng.com) and configure DNS server to return the
> same on IP lookup (testslave.techmbng.com).
>
>> From this it seems like kprop tries to do database propagation  
>> using the
> host principal for the FQDN with hostname in all small letters
> (testslave.techmbng.com) rather than the actual FQDN assigned.
>
> Is it mandatory to have to slave KDC hostname assigned with all small
> letters or am I missing something?

DNS is not case-sensitive.  Kerberos requires a single, fixed binary  
encoding of a name -- that is, the spelling of the name is case- 
sensitive.  The Kerberos library will take the name supplied and  
convert it to lowercase.  So you can tell your host its name in  
whatever case you want, and you can enter it into DNS using whatever  
case you want (the two need not match), but the Kerberos service  
principal names must use the lowercase form (and, obviously, need not  
match the other two).

Ken