ISSUE: Cannot contact any KDC for realm

[Gen Lee]

Hello Kerberos!

While testing if Kerberos is correctly installed and running (kinit
administrator at DOMAIN.COM) for my Active Directory Domain Controller with
Samba
I get error:

kinit: Cannot contact any KDC for realm 'DOMAIN.COM' while getting
initial credentials.

I traced my error with KRB5_TRACE=/dev/stdout kinit
administrator at DOMAIN.COM and
it's seems that Kerberos tries to request information from ip *10.0.2.15* but
my domain is correctly configured to ip*172.20.10.50*.

Any clue what should I configure to Kerberos for requesting information
from *172.20.10.50* not from*10.0.2.15*?

*resolv.conf*:

namserserver 172.20.10.50
search domain.com
domain DOMAIN.COM

*interfaces*:

auto eth0
iface eth0 inet static
    address 172.20.10.50
    netmask 255.255.255.0
    gateway 172.20.10.1
    dns-nameservers 172.20.10.50
    dns-search domain.com


Gen Lee