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  3. May 2016

RE: Multiple TCPIP Interfaces... how does the system choose which one to use?

Does the server choose, or does the client have to choose. What do you mean by the client does not specifically bind to an IP? Is the server pushing to the client or is the client requesting via a broadcast? Otherwise, the client has to send the request to a specific IP address (and port for that matter). Am I missing something about how IP works?

Mark Murphy
STAR BASE Consulting, Inc.
mmurphy@xxxxxxxxxxxxxxx


-----"Steinmetz, Paul" <PSteinmetz@xxxxxxxxxx> wrote: -----
To: "'Midrange Systems Technical Discussion'" <midrange-l@xxxxxxxxxxxx>
From: "Steinmetz, Paul" <PSteinmetz@xxxxxxxxxx>
Date: 05/05/2016 12:26PM
Subject: RE: Multiple TCPIP Interfaces... how does the system choose which one to use?


Brad,

We have two interfaces and had a similar issue.
We created static routes to resolve this issue.

2. Work with TCP/IP routes

Paul

-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Bradley Stone
Sent: Thursday, May 05, 2016 12:12 PM
To: Midrange Systems Technical Discussion
Subject: Multiple TCPIP Interfaces... how does the system choose which one to use?

Assume you have 2 TCPIP interfaces set up on your IBM i:

192.168.1.10
and
192.168.1.11

When a client application doesn't specifically bind to a specific TCPIP interface, how does the system choose which one is used?

In this case a client said for years it would use the right one, but one day it just "decided" to switch to the second interface causing problems since only the first interface was set up by a firewall to allow outgoing requests.

I have since explained to them how to set our software to specifically bind to the correct IP, but this question got me wondering how the system chooses which interface when there is no specific binding going on.

Thanks!

Brad
www.bvstools.com
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