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Operating Systems AIX NIM master with multiple client subnets Post 302911838 by bakunin on Monday 4th of August 2014 03:50:30 AM
Old 08-04-2014
Well, first off, the network IDs have to be unique, i. e. "subnet_1", "subnet_2", etc.. I suppose that was only a typo on your part.

To answer your question: yes, you will have to create separate NIM-networks for this. No, you won't have to configure 3 IP-aliases for your master.

The reason for this is: NIM operates using NFS (for "normal" package installations), bootp (for mksysb-installs) and tftp. All these protocols have to be - obviously - allowed by all the firewalls you might have in between your NIM-server and the prospective clients. In addition the NIM-server needs the standard gateway to each network to be able to act as a "bootp relay agent".

bootp (see RFC951, RFC1542 and others) works with broadcasts from (in respect of IP-numbers) anonymous interfaces and such packets would be dropped at the nearest router. Therefore bootp would not work over network boundaries. a "bootp relay agent" is a router which will take such a packet and forward it to a certain bootp-server and the same way tunnel its answer back to the client, so that bootp works in routed internetworks too.

I hope this helps.

bakunin
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BOOTPTEST(8)						      System Manager's Manual						      BOOTPTEST(8)

NAME
bootptest - send BOOTP queries and print responses SYNOPSIS
bootptest [ -f bootfile ] [ -h ] [ -m magic_number ] server-name [template-file] DESCRIPTION
bootptest sends BOOTP requests to the host specified as server-name at one-second intervals until either a response is received, or until ten requests have gone unanswered. After a response is received, bootptest will wait one more second listening for additional responses. OPTIONS
-f bootfile Fill in the boot file field of the request with bootfile. -h Use the hardware (Ethernet) address to identify the client. By default, the IP address is copied into the request indicating that this client already knows its IP address. -m magic_number Initialize the first word of the vendor options field with magic_number. A template-file may be specified, in which case bootptest uses the (binary) contents of this file to initialize the options area of the request packet. CREDITS
The bootptest program is a combination of original and derived works. The main program module (bootptest.c) is original work by Gordon W. Ross <gwr@mc.com>. The packet printing module (print-bootp.c) is a slightly modified version of a file from the BSD tcpdump program. This program includes software developed by the University of California, Lawrence Berkeley Laboratory and its contributors. (See the copyright notice in print-bootp.c) SEE ALSO
bootpd(8) REFERENCES
RFC951 BOOTSTRAP PROTOCOL (BOOTP) RFC1048 BOOTP Vendor Information Extensions MAINTENANCE COMMANDS
10 June 1993 BOOTPTEST(8)
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