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

NAME
ypxfrd - High speed NIS map transfer daemon SYNOPSIS
/usr/sbin/ypxfrd DESCRIPTION
The ypxfrd daemon is the transfer agent that handles map transfer requests from yppush on the master server and ypxfr on slave servers and clients. This program performs the actual transfer of the NIS maps to slave servers and clients. Typically, the maps are transferred to all slave servers and clients unless the transfer is restricted to those subnets or hosts by an entry or entries in the /etc/yp/securenets file. See ypserv(8) for information on this file. The ypxfrd daemon is activated at system startup time by an entry in the /sbin/init.d/nis file of an NIS master server machine. If the log file /var/cluster/members/{memb}/yp/ypxfrd.log exists, ypxfrd appends all its output to that file. You can use the log file to retain a record of what was attempted, and the results. See ypfiles(4) and ypserv(8) for an overview of NIS. RESTRICTIONS
The ypxfrd daemon transfers NIS maps stored as ndbm files only. It does not transfer maps stored as btree or hash files. FILES
The ypxrfd log file. Each cluster member has its own copy. SEE ALSO
Commands: yppush(8), ypserv(8), ypxfr(8) Files: ypfiles(4) ypxfrd(8)
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