Re: Setting IP redunduncay in AS/400

Requirements:
1) at least on additional Ethernet port, preferable NOT on thee same card as the current production interface also preferably to a different physical switch.
2) TWO additional IP addresses in the same subnet as the production interface.

Steps:
A) create a new IP interface using one of the new IP addresses and attach it to the current Ethernet line description, and start the interface.
B) create a new line description for the new port you are adding and vary it on.
C) create a new IP interface using the other of the new IP addresses and attach it to the new line description, and start this interface.
D) using DSPLIND display each of the two lines and record the smallest of the two frame sizes.
E) now in IBM i Navigator create a connection to the server using one of the two new interfaces, NOT the current production interface. (It will become apparent in a moment why this is important. )
F) locate networking, TCP/IP and IPv4. Expand that to see the IP interfaces. You should see the three for this effort plus 127.0.0.1 and any used for tools like iTerra, Maxava, Mimix, PowerHA etc.
G) Right click on the production IP address and end it. DID I MENTION THIS WOULD BE DISRUPTIVE? Yeah could be! This is also why you don't want to be connected to this IP address at this time. :-)
H) Now delete the production IP from the server.
I) Now create a new IP Interface that is type VIrtual. Attributes required:
- Use the Production IP address
- Subnet mask of 255.255.255.255 Seems just wrong but it is correct.
- On the advanced tab check the Proxy Arp box.
- On the advanced tab enter the frame size recorded in D above.
- IF you prefer that traffic flow over one of the two lines, select that as the preferred interface. Otherwise leave this alone. You might do this if one of the lines is 1G and the other is 100M, prefer the 1G line in this case.
J) Now start the interface and you're back in business.

Considerations:
I) You can now pull either line out or fail a card or switch port or cut a cable and the users will not know.
II) Traffic will be flowing almost exclusively over just one of the lines. If that's the one that fails then traffic moves to the other line immediately. The system will issue a gratuitous ARP to inform everyone on that subnet that the MAC address of the interface has changed.
III) IMPORTANT: Traffic that is INITIATED from the server (e.g. EDI or bank transmissions) will come from one of the two new interfaces now, NEVER from the production IP. This has firewall implications, understand this.
IV) For enhanced reliability set the CMNRCYLMT parm on the Ethernet line descriptions to (1 0) for infinite retries. You can do this while the lines are varied on.
V) This works on V5R3 and up.

Done from memory while off line, please forgive any slight discrepancies in terminology to what's on the screen.

DrFranken
Sent from my iPad

On Oct 1, 2013, at 10:07 AM, Vikhyath Kamath <vikyat_kaamath@xxxxxxxxx> wrote:

*This message was transferred with a trial version of CommuniGate(r) Pro*
Hi,

We use IBM i V6R1.

We have a 2 or more LAN adaptors in each LPAR. We use one IP for HA (ITERA) and other is accessed by users.

Thanks and Regards,
Vik.


________________________________
From: Midrange <midrange@xxxxxxxxxxxx>
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>
Sent: Tuesday, October 1, 2013 7:04 PM
Subject: Re: Setting IP redunduncay in AS/400


Please tell us the software release as the available options change significantly. If you are truly running AS/400 then you may not have options. Also do you have more than 1 LAN card available for each partition?

DrFranken.

Sent from my iPad

On Oct 1, 2013, at 9:22 AM, Vikhyath Kamath <vikyat_kaamath@xxxxxxxxx> wrote:

Hi,

We have 5 LPARs on each of our servers. Recently we faced an issue where the LAN adaptor of iseries system failed and we had a five hour outage.
I was considering if we could have IP redundency - so that each LPAR would have 2 IPs pointing one IP which the user access. So if one IP fails, there is a fail-over to the other IP. Could some please guide how this is done in AS/400 system?

Thanks and Regards,
Vik.
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