Hello,

The picture here shows my problem on aix:

http://camp.homelinux.net/src_ip-problem-public.jpg

I'm wondering if there might be a way to fill in the
virtual ip_src from the Network IP layer.... My aix admins
say the only way to do this is to remove the virtuals
and add NICs for each application....

Is this really my only option?

Thanks for your time....
-- foobee

foobee wrote:

> The picture here shows my problem on aix:
>
> http://camp.homelinux.net/src_ip-problem-public.jpg
>
> I'm wondering if there might be a way to fill in the
> virtual ip_src from the Network IP layer.... My aix admins
> say the only way to do this is to remove the virtuals
> and add NICs for each application....
>
> Is this really my only option?

Ok, let's see if we understand this right. Each server (server1,
server2) has one NIC. Each NIC has two IP addresses. You want
"application" on server1 to open a socket to "service" on server2 and
"service" to see the source ip address of the data as a specific one of
the two IP addresses on server1?

If that's how it is the answer is easy - change application to bind() to
a specific IP address on server1 before it opens the socket to server2.
Even if you don't control the source code to the application, many
mainstream applications allow you to bind() a specific address.

If not, please post more detail.

> Ok, let's see if we understand this right

That's it.... You got it...

> If that's how it is the answer is easy - change application to bind() to
> a specific IP address on server1 before it opens the socket to server2.

Ok... I have looked @ this a bit.... Looks like I need to do more
research in this area... So all the applications run in the
Java websphere env..... one application / JVM.... Any idea how to set
the bind() address for a complete JVM?

> Even if you don't control the source code to the application, many
> mainstream applications allow you to bind() a specific address.

I don't control the source...

Thanks soooooo much for your time and thoughts....

-- foobee

You can find info on binding Websphere to a specific ip address here:

http://www-1.ibm.com/support/docview...=UTF-8&lang=en

Just what I needed..... Thanks to all!

-- foobee

Ok.... I though that I had a configuration issue on my machine and
the IBM guy (pmr 30146,344) was going to help me w/ it....
But after talking more w/ him..... He said the configuration is correct
and we have JUST verified that it is NOT possible from w/ in
websphere to set the src_ip with this configuration:

http://www-1.ibm.com/support/docview...=UTF-8&lang=en

Basically he wasn't sure of the src_ip result.... And I just proved it
doesn't work... The tech note we now know is ONLY for
listening...
He also said he has talked w/ colleagues and they know of no way from
w/in websphere to set the src_ip....

So where do we go from here?

1) Write a cutpoint in AspectJ (Aspect Orientated Programming) for
the java.net.Socket constructors that redirects to the existing
java.net.Socket constructor that I have working. This would
allow us to build dependencies for all connections including
LDAP, Oracle, VCom, HTTP, etc.... With no changes to the applications.

2) Write some code.. somewhere... that populates an http header
which can be used for only HTTP dependency mapping.... This
could done w/ an Aspect or may require application code changes.

Any thoughts?

-- foobee