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Operating Systems Linux Red Hat Purpose of Static IP address through DHCP Post 302534010 by Lazydog on Sunday 26th of June 2011 12:44:00 PM
Old 06-26-2011
Here is the thought process;

DHCP is use for mobile devices which could/do move around form one network to another, i.e., Laptops.

Static is used for device that would not move around, i.e., Servers, Desktops and Printers.

If your network is growing then any new device that is static would get a static IP address for the new network. Mobile device connecting to the new network would get a DHCP address from the new network.

I guess if you are working for Mom & Pop you don't need to think this way but in an environment of 6000+ employees and 10000+ devices, using DHCP for static is not going to cut it.

Here is another thing to think about. Just because you map an ip address to a MAC address doesn't mean the machine is going to be assigned to that device. MAC spoofing ring any bells? This is why you want devices that provide a serves to have a static IP Address not some sort of DHCP static.

At the end of the day it all comes down to what you prefer. I prefer static devices to have static addresses and mobile devices to have DHCP addresses. If you cannot see far enough into the future to plan ahead for a growing network.......
 

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bptojdb(8)						      System Manager's Manual							bptojdb(8)

NAME
bptojdb - Converts bootptab entries into permanent, static IP entries for JOIN databases. SYNOPSIS
/usr/sbin/bptojdb [-m | -f] filename OPTIONS
Create client IDs for Microsoft DHCP clients. Microsoft does not use the client's MAC address by itself as the client identifier. Instead, it prepends a 01 (Ethernet) to the MAC address and changes the hardware type to 0 (generic). If the clients in your bootptab file are Microsoft clients, you will need to use the -m option. Create client IDs for FTP Software's DHCP clients. FTP Software does not use the client's MAC address by itself as the client identifier. Instead, it creates a 16-byte client identifier with the prefix "cid-". If the clients in your bootptab file are FTP Software DHCP clients, you will need to use the -f option. DESCRIPTION
The bptojdb program reads entries in a standard bootptab file and creates permanent, static IP entries for the JOIN databases. After read- ing the bootptab file, bptojdb displays to the standard output entries in a format suitable for the jdbmod utility. Each MAC address in the bootptab file is given a static IP address with a permanent lease. To store the information in the JOIN databases, run jdbmod with the converted data. For example: bptojdb bootptab | jdbmod FILES
SEE ALSO
Commands: jdbdump(8), jdbmod(8) bptojdb(8)
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