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Operating Systems AIX Moving VIOS, LPAR's, HMC to different subnet Post 302892794 by ibmtech on Friday 14th of March 2014 01:50:11 PM
Old 03-14-2014
Ok, that means eth0 (192.168.128.X) is the private network (which communicates with all Manage systems).

Eth1 is your public IP (which you use to establish connection from putty or web).
Unless you do VLAN Tagging or give a dedicated ethernet card to LPAR, they have to be on same subnet as your VIO

Code:
"Now I figured that default gateway has to be the same one that of VIOS  and LPAR's are using in order for HMC to connect to them via console".

This sentence is not really true, because the connection to Manage systems is through Private network and that is the reason you see Manage systems with different subnets are connected to HMC. (my personal example, I have my HMC on 10.10.4.x network and my MS on 4.x and 170.x)

Ok, if your eth2 configuration worked, then something must be wrong with eth1 configuration (either gateway or subnet mask values), or may be that IP is conflicting with other host.
We need more details on this to understand and troubleshoot.

Once you are in HMC, you will use console to get into VIO/LPAR, but in order to reach HMC you configure Public IP (in your case eth2).

So, once you are connected to HMC, then you use console to get to VIOS/LPAR.

Look at the network topology (from HMC under HMC management select that), you should see eth0 as the interface for all connections.

Hope this helps.
 

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nets(4) 						     Kernel Interfaces Manual							   nets(4)

NAME
nets - JOIN DHCP server database DESCRIPTION
The nets file is employed by joind, the JOIN DHCP server, to tell it which networks to administer and the ranges of IP addresses available for dynamic assignment on each of those networks. FORMAT Blank lines and lines beginning with the number sign (#) are ignored. Entries are separated from one another by newline characters. Entries consist of three fields: the network number (expressed as an IP address), the IP address or name of a host running joind, which dynamically configures clients on the network, and a range of available addresses for dynamic allocation to hosts on the net. The range is expressed as a pair of IP addresses separated with a dash (-). There must be no whitespace separating the dash from the IP addresses. Several servers may administer a single network, and a single server may administer several networks. Each network-server pair may have several ranges of IP addresses available for dynamic allocation. The network and server IP addresses do not have to be repeated for each entry. A line containing a single field is assumed to be an IP range with the same server and network as the previous entry: a line of two fields is assumed to be a server address and IP range with the same network as the preceding entry. The ranges of addresses served by each cooperating server must be disjoint. This condition is checked by the server on startup. RELATED INFORMATION
joind(8), join.ipaddresses(4) delim off nets(4)
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