Medias Mediatrix 1204, Reference Manual

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DHCP Server Configuration Reference Manual (SIP Version)
Mediatrix 1204 129
Changing the Size of DHCP Requests
You can append a string to the value used as Vendor Class ID (Option 60) in a DHCP request. This option is
useful when servers require that DHCP packets sent to them be of a minimum size. A string of arbitrary
characters (including blanks) can then be used to artificially increase the size of DHCP requests.
See “Vendor Class ID” on page 131 for more details.
X
To change the size of DHCP requests:
1. In the sysConfigMIB , define the string to append in the sysConfigProductNamePadding variable.
DHCP Server Configuration
DHCP servers generally allocate a range of IP addresses for use on a network and reserve IP addresses for
specific devices using a unique identifier for each device. The Mediatrix 1204 unique identifier is its media
access control (MAC) address.
You can locate the MAC address as follows:
on the label located on the bottom side of the unit.
in the sysMgmtMIB under the sysMacAddress variable.
you can dial the following digits on a telephone that is calling one of the SCN lines or analog
PBX extensions connected to the Mediatrix 1204:
*#*1
The Mediatrix 1204 answers back with its MAC address. See “Special Vocal Features” on page 14
for more details.
Mediatrix recommends to reserve an IP address with an infinite lease for each Mediatrix 1204 on the network.
Connection to the DHCP Behaviour
When the Mediatrix 1204 restarts, it requests a DHCP offer to get its IP addresses and network information.
The Mediatrix 1204 waits four seconds before sending another request. The delay between each request is
increased exponentially after each request up to a maximum delay of 64 seconds, and then restarts at a 4
seconds delay.
first request: 4 seconds delay
second request: 8 seconds delay
third request: 16 seconds delay
fourth request: 32 seconds delay
fifth request: 64 seconds delay
sixth request: 4 seconds delay
seventh request: 8 seconds delay
etc.
The Mediatrix 1204 stops broadcasting as soon as it receives at least one reply. If the offer is valid, the
Mediatrix 1204 takes it and continues its initialization procedure.
Standards Supported • RFC 2131 – Dynamic Host Configuration Protocol, section 2
• RFC 2132 – DHCP Options and BOOTP Vendor Extensions
Note:
Mediatrix recommends to use a Windows 2000- or Unix-based DHCP server. If you run Windows NT
4.0 and use the built-in Microsoft DHCP Server, use the Site Specific instead of Vendor Specific information.
Note:
If the localHostSelectConfigSource variable is set to static and any other xxSelectConfigSource
variable is set to dhcp , the Mediatrix 1204 makes its DHCP request that will be released immediately.