Print Services for Unix & 11 Port Issue

[Caine Chow]

Just a quick question.

Does "Print Services for Unix" have any limitations on the number of ports
or connections that can be used to print to the spooler?

Does it have the "11 Port" issue where by default only 11 ports can be used
for LPR type connections (but can be configured to use more)?

Thanks.

C

 

[Alan Morris]

And a quick answer.
The LPD service in Windows will take as many connections as is set in the
registry.

HKLM\SYSTEM\CurrentControlSet\Services\LPDSVC\Parameters\MaxConcurrentUsers

http://support.microsoft.com/default.aspx?scid=kb;en-us;121786
LPR and LPD Registry Entries for TCP/IP Printing



LPR Port printing to an LPD service follows the IEEE spec of TCP port use
721 to 731.

Once port 721 to 731 are used tcpip will not allow any service to use the
port until after the tcpip timeout has expired and the tcp port is once
again available.

If you need this info it's also @ microsoft.com

 

[Bruce Sanderson]

The "11 port" thing is about the ports used by the client to establish a
connection with an LPD on a server. RFC 1179 says that the client (lpr)
must use ports 721 through 731 to send to the lpd port (515).

There is no limitation on what sending ports the LPD function in Print
Services for Unix will respond to - the LPD listening on port 515 will
accept connections from any source port.

In older versions of Windows (NT 3.51 prior to Servcie Pack 5), the LPR
client would only send print on ports 721-731. So, if there were more than
11 printers defined on a computer to use LPR, there could be printing
slowdowns etc.

Registry entries were added to NT 3.51 and NT 4.0 by Service Packs that
allow LPR to use (send on) ports other than those defined by RFC 1179. The
"Standard TCP/IP Port) in Windows 2000 and later has this turned on by
default - it will always use any available port above 1024.

If you choose to use the LPR Port created by Print Services for Unix
(instead of the "Standard TCP/IP Port), it will restrict source ports to
conform to RFC 1179 by default (721-731). KB article 179156 discusses this
and how to configure the Print Services for Unix port to use any available
port.

See
http://support.microsoft.com/default.aspx?scid=kb;en-us;141708
http://support.microsoft.com/default.aspx?scid=kb;en-us;179156