Weird extranet problem

[Stacy Pober]

> At 05:20 PM 2/7/99 -0800, Spober at manhattan.edu wrote:
> >Using the URL:  http://www.umi.com/pqdauto the error message [appears]...
> >Using the numeric URL that is the equivalent of the above address
> >(http://192.195.245.135/pqdauto) the error message [appears]...
> >Using the numeric IP:  http://192.195.245.140 we can get to a generic UMI
> >page, but ...

> From: James Klock <j-klock at evanston.lib.il.us>
> Aha!
> 
> UMI, being a subscription server, wants to convince themselves that the
> requests for information that they are serving are coming from people who
> are paying for it.  One of the ways that they do this is by confirming the
> IP # of the requesting machine.  We, for example, have told them to allow
> connection from any machine in the 207.227.130.* subnet.  
> http://www.umi.com/pqdauto  is, if memory serves, the URL through which UMI
> authenticates IP numbers before sending traffic on to the data.  
> It sounds like what's happening is that when you try to contact UMI via
> your Extranet connection, your IP number is not the same as when you go
> through your campus Internet connection.  
> 
> My suggestion: contact your Extranet provider, and find out from them what
> IP number your outgoing traffic uses.  If they are assinging you a dynamic
> IP number from a pool, you may have a problem.  If not, the easiest thing
> to do is to tell UMI to enable access from the IP number(s) that your
> Extranet connection uses.  Our experience has been that UMI is quite
> reasonable about allowing customers to register whatever range of IP
> numbers they wish.

Hmm, interesting. 

The thing is, we provided the same address range to another vendor who 
uses restriction to filter out non-subscribers.  The other vendor's site 
works fine for us over the Extranet, even during periods when the campus 
connection is down.  So I think the machine IP's are getting through 
unchanged over the Extranet.

Could UMI somehow inadvertantly be filtering our connections based on the 
address of the Extranet router rather than the IP's of the individual 
computers?   How does the router IP address get sent instead of the IPs 
for the workstations?




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Stacy Pober                   mailto: spober at manhattan.edu
Information Alchemist         http://www.manhattan.edu/library/
Manhattan College Libraries   Voice: 718-862-7166
Riverdale, NY 10471           Fax:   718-862-7995
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