kerberos log messages

[Felix Koop]

Hi kerberos gurus,

I have set up a kerberos server in a small environment. Now I am seeing
several kind of log messages and I don't know if I should be concerned:

AS_REQ (7 etypes {18 17 16 23 1 3 2}) <krb-server IP>: ISSUE: authtime
1231456921, etypes {rep=18 tkt=16 ses=16}, <krb-principal>@<realm> for
krbtgt/<realm>@<realm>

TGS_REQ (1 etypes {1}) <krb-server IP>: ISSUE: authtime 1231486439,
etypes {rep=16 tkt=1 ses=1}, <krb-principal>@<realm> for <service
principal>
TGS_REQ (7 etypes {18 17 16 23 1 3 2}) <krb-server IP>: ISSUE: authtime
1231534749, etypes {rep=16 tkt=18 ses=18}, <krb-principal>@<realm> for
host/<server>@<realm>

Could someone please explain what these mean and if they are important?
If there is any documentation that I should read, I would be grateful
for a pointer. Thanks.

-- 
Mit freundlichen Grüßen

Felix Koop