RE: IBM i Access for Web vs IBM Navigator for i

Rob,

I'm trying to understand this entire iNav, IPV6, Java issue.
Correct me if I'm wrong.
iNav, (which uses Java), will, by default, try to use IPV6, which if not correctly configured, will cause performance issues.
Even though we're not using IPV6, any iSeries Java apps (iNav being of them) will attempt to use IPV6.
So I should stop IPV6 from starting, even though it posts TCP8A2A - Start IPv6 request completed successfully.
The only IPV6 config I see on my LPARS is a DNS config,

Internet Host
Address Name
::1 IPV6-LOOPBACK
IPV6-LOCALHOST

However, I did find a note from our V5R4 to V6R1 OS upgrade (Apr 2011), for one of our 3rd party apps.
"Additionally, they can either load an IBM PTF or have IPv6 enabled otherwise RPC will not work. If they are going the PTF route then it is SI38907
You Must insure that IPV6 or IPPV6 is enabled or RPC will not function"

At this point, I'm not sure if I can turn off IPV6.

Thanks
Paul


-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of rob@xxxxxxxxx
Sent: Monday, November 04, 2013 11:13 AM
To: Midrange Systems Technical Discussion
Subject: RE: IBM i Access for Web vs IBM Navigator for i

Based on what you've read before, what do you think Paul, and why?


Rob Berendt
--
IBM Certified System Administrator - IBM i 6.1 Group Dekko Dept 1600 Mail to: 2505 Dekko Drive
Garrett, IN 46738
Ship to: Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com





From: "Steinmetz, Paul" <PSteinmetz@xxxxxxxxxx>
To: "'midrange-l@xxxxxxxxxxxx'" <midrange-l@xxxxxxxxxxxx>
Date: 11/04/2013 11:07 AM
Subject: RE: IBM i Access for Web vs IBM Navigator for i
Sent by: midrange-l-bounces@xxxxxxxxxxxx



A few questions about the IPV6 issue.
Is this the same on V6R1 and V7R1?
I'm currently on V6R1, not using IPV6, however, the below message posts
following IPL or system saves.
TCP8A2A - Start IPv6 request completed successfully.
Even though IPV6 is started successfully, is it correct that turning off
IPV6 may improve iNAV performance?

Thanks
Paul

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [
mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Gqcy
Sent: Monday, November 04, 2013 10:49 AM
To: midrange-l@xxxxxxxxxxxx
Subject: Re: IBM i Access for Web vs IBM Navigator for i

Is there a way to turn off IPV6 while TCP is active, or do I need to
ENDTCP and start it again?


On 11/4/2013 9:21 AM, Dan Kimmel wrote:

More than just CPU cycles: I'm not sure of all the mechanics, but

there's a timeout wait for an IPV6 DNS server to respond before it'll kick
down to IPV4. That timeout is repeated, and repeated, and repeated on
every access to a server, even if the IP address is given in IPV4
notation.

Java always "prefers" IPV6 unless you tell it otherwise on the java

command line. The product I develop for RJS is a java web-app that talks
to a java web-service, both running on i. Our customers started installing
7.1 (where the default for starting IPV6 changed) and performance on our
product fell through the floor for some customers even though they had
moved to a faster machine. The solution turned out to be either to turn
off IPV6, or to add the -preferIPV4=true flag on the java command line, or
to configure IPV6 properly.

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-
bounces@xxxxxxxxxxxx] On Behalf Of Jim Oberholtzer
Sent: Monday, November 04, 2013 7:21 AM
To: Midrange Systems Technical Discussion
Subject: Re: IBM i Access for Web vs IBM Navigator for i

Nevertheless, it's a reasonable question. If there is an attempt to
communicate with IPV6, then significant CPU cycles may be expended to
detect and communicate with the network. It's best to turn off IPV6
unless it is properly configured and in use. Remember the defaults are
on, not off.

Jim Oberholtzer
Chief Technical Architect
Agile Technology Architects


On 11/3/2013 5:45 PM, Jack Callahan wrote:

Do all these systems have IPV6 configured properly? This sounds a lot

like

that problem. You don't notice it when all the IP you're doing is

telnet or

FTP, but when you start to use highly interactive web interfaces,

like

WebNav, missing IPV6 DNS server definitions KILL performance.

A bit presumptive of IBM to assume IPv6 is in use, if that's the cause

of

the performance problem.

Haven't run across anywhere in IBM documentation the states IPv6 is

the

preferred networking protocol for Navigator for i.

IPv6 certainly isn't in use on my firm's networks- still running IPv4
everywhere. And yet other web apps seem to run acceptably.
--

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