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Operating Systems Linux Red Hat Purpose of Static IP address through DHCP Post 302534027 by Perderabo on Sunday 26th of June 2011 03:36:54 PM
Old 06-26-2011
We have to build thousands of PC's where I work. They are all built with the same image and thus they all use DHCP. A very few of them need a static IP (or at least the owners think they do Smilie). We assign these static IP's but the PC's still use DHCP. We have almost 3,000 PC's but less than 100 of them have static IP addresses.

The usual genuine reason for assigning static IP's is security. My PC has a static IP address and that address is known by various highly secured servers. Thus an ssh from my PC will be accepted.

At home I use static IP addresses because I feel like it. But my roku box must use DHCP, it has no capabilty to enter an IP address directly. This is the only device I know that must use DHCP but I guess that others may exist.
 

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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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