Novell ZENWORKS LINUX MANAGEMENT 7.3 IR2, Administration Manual

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376 Novell ZENworks 7.3 Linux Management Administration Guide
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The well-known IP ports include:
Š
67 decimal: The Proxy DHCP server listens on this port for PXE information requests. This is
the same port used by a standard DHCP server.
Š
68 decimal: The DHCP/Proxy DHCP server responds to client requests on this port. This is the
same port used by a standard DHCP server.
Š
69 decimal: The TFTP server listens on this port for file requests from PXE devices.
Š
4011 decimal: When running on the same server as the DHCP daemon, the Proxy DHCP
server listens on this port for PXE information requests.
The proprietary IP ports include:
Š 998 decimal: novell-pbserv client connection port. The novell-pbserv daemon receives all
connection requests from the Preboot Services devices on this port.
Š
13331 decimal: novell-zmgprebootpolicy client connection port. The novell-
zmgprebootpolicy daemon receives all connection requests from the PXE devices on this port.
Although PXE devices make their initial requests to the novell-tftp and novell-zmgprebootpolicy
daemons on the ports listed above, the remainder of the transactions can occur on any available port.
For this reason, imaging servers cannot be separated from their clients by a firewall.
IMPORTANT: The novell-tftp and novell-zmgprebootpolicy daemons are not firewall or network
filter friendly. You should not attempt to run these daemons through a firewall. If users need to pass
preboot work through a firewall, then all Preboot Services work needs to be on the outside and
merely reference a Web service inside the firewall.
29.3.4 Editing the Preboot Services Menu
Depending on the configuration settings for Preboot Services in the ZENworks Control Center, PXE
devices may be able to display the Preboot Services Menu during the boot process. The menu has
the following options:
Š
Start ZENworks Imaging
Š Start ZENworks Imaging Maintenance
Š
Disable the ZENworks Partition
Š Enable the ZENworks Partition
Š
Start DELL DTK
Š Start DELL DTK (Maintenance Mode)
Š
Exit
For more information on configuring whether to display the menu, see Section 29.4.1, “Configuring
Preboot Services Menu Options,” on page 380 .
There might be circumstances when you want to modify the options on the Preboot Services Menu.
You can customize these options by editing a text file contained on the imaging server. For example,
you can:
Š
Add, delete, and modify menu options