Hi DrFranken,
thanks for this info, gives a nice insight into the innards of i5/OS.
I didn't know there were two different IP stacks!
Regarding the Operations Console over LAN: what is your experience with this setup? Easy and dependable to setup, or does it require voodoo-magic and planet alignment like the Direct Access method?
I plan to do a fresh install from D M IPL (already have the licensekeys on paper), so I'm thinking about adding a second Ethernet card to the system, and perform the install / administration from LAN console.
regards,
Rene.
________________________________
From: DrFranken <midrange@xxxxxxxxxxxx>
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>
Cc: Rene K. <kraats@xxxxxxxxx>
Sent: Friday, July 5, 2013 4:04 PM
Subject: Re: Question: Operations Console via TCPIP?
The thing you probably don't understand is that there is a second TCP/IP
stack in the system. The one we use every day all day is up in IBM i and
that runs as a collection of jobs mostly in QSYSWRK subsystem. Clearly
when the system is in restricted state due to ENDSBS *ALL or ENDSYS then
that subsystem is down and that TCP/IP stack is shut down. If the
console was connected this way it would disconnect. So now what?
The Second TCP/IP Stack is in the Licensed Internal Code (LIC) It
doesn't have all the capability of the primary one and doesn't support a
suite of servers like FTP, DHCP, SMTP etc. It also has a limited list of
supported network adapters (all the ones that at GbE capable are on the
supported list) and it doesn't do Jumbo Frames for example.
So as you would expect this second stack requires it's own Ethernet
port. It doesn't need an entire card, just one port from it. If the
system is partition this Ethernet card muse be required by the
partition. It also needs it's own IP address that is different from IBM
i. Generally it is in the same subnet although that's up to you.
To configure this first identify the port that you want to use and
make sure it has no Ethernet line description attached to it in IBM i
and certainly not varied on! Record the Resource Name for the "Ethernet
Port" from WRKHDWRSC *CMN that you will use for the console connection.
Now enter Service Tools, take option 8 (Service tools user IDs and
Devices) and then press F13 (Select STS LAN adapter) If one is already
configured it will have a "*" in the selected column. If so you'll need
to understand why that is already there. Now select your adapter (option
1) and enter the IP address for it as well as the mask and gateway. The
Host Name for Servie Tools should match what you'll use on the PC side
when configuring the LAN console connection.
One entered press F7 to store and then F14 to activate. Once activated
(takes about 30 seconds for some reason) you should be able to PING this
address from the PC you want to use for LAN console.
So now you have a separate TCP/IP connection to the LIC that doesn't
reach up into IBM i. This connection is used primarily for two things:
1) The console as you're learning and 2) Virtual Optical media that are
hosted by another IBM i system. You can imagine that this virtual
optical, like the console, might need to work when the system is in
restricted state and over this connection it does!
To tell the system you intend a LAN console you'll want to next take
option 3 to select the console type and chose option 3 from Work with
Service Tools User IDs and Devices menu, Ops Console(LAN)
Switching from "other" to LAN console is best done this way rather
than playing the front panel games. This way you can assure the port is
available, the IP address is assigned, the network is connected, and
there is no mystery to switching. With the front panel you'll likely
have at least a couple tries at it before you get it going.
- Larry "DrFranken" Bolhuis
www.frankeni.com
www.iDevCloud.com
www.iInTheCloud.com
On 7/5/2013 4:53 AM, Rene K. wrote:
Hi All,
can someone tell me how Operations Console via TCP/IP works?
I've read the PDF's, but I'm still a bit unsure about how this setup works.
Suppose I use the control panel to '65+21' the console to a LAN connection, and use a 'D M' mode IPL to start from the BASE_01 CD.
Does the system then automatically present it's console via the LAN card? (it's in the right slot, i checked). When trying to connect to it from Operations Console, will it then use a preset TCP/IP address, or does it need an DHCP server for that?
Thanks,
Rene.
midrange.com
