[CentOS] CUPS and virtual interfaces

From: "m.roth at 5-cent.us" <m.roth at 5-cent.us>
>> Yes, the CUPS Manual says: 
>> "Multiple Listen directives can be provided to
>> listen on multiple addresses"
> Well, did that... and no joy, from another box, I can still 
> telnet to the server on one of the virtual IPs, port 631. 
> I can't really play around much, here - this is a production 
> box, used by a lot of staff.

Strange; I just created an alias on my PC, told cups to listen on my main IP, and it did...

eth0 = 192.168.16.23
eth0:0 = 192.168.16.40

# grep Listen /etc/cups/cupsd.conf
Listen localhost:631
Listen 192.168.16.23:631
Listen /var/run/cups/cups.sock

# netstat -nltp | grep cupsd
tcp        0      0 192.168.16.23:631           0.0.0.0:*                   LISTEN      18733/cupsd
tcp        0      0 127.0.0.1:631               0.0.0.0:*                   LISTEN      18733/cupsd

$ telnet 192.168.16.40 631
Trying 192.168.16.40...
telnet: connect to address 192.168.16.40: Connection refused
telnet: Unable to connect to remote host: Connection refused

Guess you restarted cupsd... right?

JD