topic Authenticating multiple users from the same IP Address ? in Network Access Control

Authenticating multiple users from the same IP Address ?

steve.saindon — Fri, 21 Feb 2020 18:05:35 GMT

Hi,

I have a situation where I need to authenticate inside http users before going on the Internet. Easy enough with the PIX or the “Authentication proxy feature” on the IOS Firewall combined with a Tacacs server.

Problem is : All users appear as the same IP Address to the Firewall, since Citrix servers are used on the inside. The firewall sees traffic just if it had just passed a NAT : the same IP address for everyone but only multiplexed on a port basis.

I was thinking of using the “Authentication proxy feature” on the IOS Firewall but I’ve noticed the following in the “Restrictions” section :

http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/products_configuration_guide_chapter09186a00800ca7c7.html

“The authentication proxy does not support concurrent usage; that is, if two users try to log in from the same host at the same time, authentication and authorization applies only to the user who first submits a valid username and password.”

Which I think defeats what I’m trying to do.

Question : Is there anyone with a similar situation ? If yes, did you find any features that would support such an environment ?

Thanks !

Steve Saindon

Network Consultant

Interreseau-Conseils Inc.

Re: Authenticating multiple users from the same IP Address ?

rais — Wed, 04 Dec 2002 19:29:14 GMT

I believe you have to have a separate internal proxy server that sees all users' IP addresses the way they are. The server then direct them to the internet based upon the correct user/password.

Hope this helps.

Re: Authenticating multiple users from the same IP Address ?

bdube — Wed, 04 Dec 2002 21:24:58 GMT

Salut Steve,

Even to surf the Web, your client is forcing users to pass through the Citrix server(s) ? This seems a little bit strange.

About the restriction, i've got the same one before and i didn't find a solution with the PIX.

Since users connect to Citrix before, and i suppose that users have been authentified there, you may leave all traffics from Citrix servers pass through without auth.

Salut

Benoît