[CentOS] Centos 7 using cups with cups-lpd loaded getting print jobs from an Sco Unix lpd system

Thu Sep 17 21:52:55 UTC 2015
Shawn Parks - CMAC <shawnparks at cmacmail.biz>

Centos users,
   I new to Centos 7 and my problem is the following:
I am using my Centos 7 system as a print server in a warehouse.
Using cups for the print queue's.  Which I can print to the printers
find from the Centos 7 machine.

The hosting system is Sco Unix using lpd printing.  This machine is
in Illinois and the warehouse / Centos 7 machine is in Arizona.

I have loaded "cups-lpd" using yum and it seems fine.  I have
also setup "/etc/xinetd.d/cups-lpd"

Following is a "netstat -tanp |grep -i listen"

tcp        0      0    *               
LISTEN      1090/sshd
tcp        0      0   *               
LISTEN      1096/cupsd
tcp        0      0  *               
LISTEN      1671/master
tcp6       0      0 :::515                  :::*                    
LISTEN      1095/xinetd
tcp6       0      0 :::22                   :::*                    
LISTEN      1090/sshd
tcp6       0      0 :::631                  :::*                    
LISTEN      1096/cupsd
tcp6       0      0 ::1:25                  :::*                    
LISTEN      1671/master

I notice that "port 515" is only listening on tcp6 not tcp.

Question:  could this be my problem?  and how can I get "port 515" to be 
listened to on tcp?

my Sco Unix print queue "status" file says "waiting for gate to come 

I have had the local hardware person verify that the router is "port 
forwarding" port 515
to my Centos 7 system.

Help in this matter would be greatly appreciated.