The following servers are used by an HMC when it is configured to use Internet VPN connectivity. All
connections use ESP and UDP on port 500 and port 4500 when a Network Address Translation (NAT)
firewall is being used.
v 129.42.160.16 IBM VPN Server
v 207.25.252.196 IBM VPN Server
Using the telephone and modems to connect to remote support
If you want to use a modem to connect to remote support, you must provide a dedicated analog line to
connect to the HMC modem. The HMC uses the modem to dial the global network and to connect to
IBM service and support.
For more information about connecting to remote support using the telephone and modems, see
“Configuring the HMC network types” on page 50.
Using multiple call-home servers
This topic describes what you need to know when you decide to use more than one call-home server.
To avoid a single point of failure, configure the HMC to use multiple call-home servers. The first
available call-home server attempts to handle each service event. If the connection or transmission fails
with this call-home server, the service request is retried using the other available call-home servers until
one is successful or all have been tried.
The connected HMC that has been identified by problem analysis to be the primary analyzing console for
a given managed system will report the problem. This primary console will also replicate the problem
report to any secondary HMC. This secondary HMC must be recognized on the network by the primary
HMC. A secondary HMC is recognized by the primary HMC as an additional call-home server when:
v The primary HMC is configured to use "discovered" call-home servers and the call-home server is
either on the same subnet as the primary HMC or it manages the same system
v The call-home server has been manually added to the list of call-home server consoles available for
outbound connectivity
Choosing network settings on the HMC
Learn about the network settings you can use on the HMC.
Installing and configuring the Hardware Management Console 9
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