Re: HMC: IBM recommended I turn off local loopback.

Doing a lshmc -n on the HMC brings only the eth0-eth1 on my old CR4. On the
HMC you only have control over the physical interfaces, not the loopback
(that's virtual) nor the usb that goes to the service processor on most
xseries or other auxiliary interfaces the system might use internally.
AFAIK as a rule any interface not in use should not be configured.

Roberto

On Wed, Aug 8, 2018 at 10:00 AM, Rob Berendt <rob@xxxxxxxxx> wrote:

Potential there... However I'm not up to speed in linux notation. In IBM
i terminology NETSTAT *IFC shows up 127.0.0.1 on a line description of
*LOOPBACK. What would that be for Linux?


Rob Berendt
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Dept 1600
Mail to: 2505 Dekko Drive
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From: "Roberto José Etcheverry Romero" <yggdrasil.raiker@xxxxxxxxx>
To: "Midrange Systems Technical Discussion" <midrange-l@xxxxxxxxxxxx>
Date: 08/08/2018 08:39 AM
Subject: Re: HMC: IBM recommended I turn off local loopback.
Sent by: "MIDRANGE-L" <midrange-l-bounces@xxxxxxxxxxxx>



Ah but I think that is not a case of "turn off the loopback interface"
which, IIRC, is lo0 but take off the IP from a real interface that's not
in
use.
Maybe having the loopback IP on a not-in-use interface messes with the
real
loopback?

Roberto

On Tue, Aug 7, 2018 at 5:09 PM, DrFranken <midrange@xxxxxxxxxxxx> wrote:

I would want to know why. Almost any computer today 'talks to itself'
using the loopback. Linux is no exception. HMC is Linux.

- Larry "DrFranken" Bolhuis

www.Frankeni.com
www.iDevCloud.com - Personal Development IBM i timeshare service.
www.iInTheCloud.com - Commercial IBM i Cloud Hosting.

On 8/7/2018 3:51 PM, Rob Berendt wrote:

While working with a serviceable event on my HMC they had me send in

some

dumps.
A tangent on their analysis was that they recommended that I turn off

the

local loopback.
HMC Management
Network Settings
Change network settings.
Select eth0, Details

Change from:

Specify an IP address
TCP/IP interface address: 127.0.0.1
TCP/IP interface network mask: 255.0.0.0

to:

No IPv4 address

I wasn't really given a reason why. Should I just do it?

eth3 is the one really in use.


Rob Berendt

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