While my experience with Citrix is extremely limited, I do know that 
there is, indeed, a Linux client.  HP uses them on some of their 
Linux-based Thin Clients.  We never had a Citrix server to test it out 
with, hence the limitation.  According to this website:

http://www.citrix.com/site/SS/downloads/details.asp?dID=2755&downloadID=3323

They have the client downloads for Linux in zip and rpm format.  I am 
sure that alien could provide a debianized package as well. ;)

As for functionality, that's something that I throw my hands up in the 
air with, but it did seem to have a similar entrypoint as rdesktop, 
asking for an IP address and port to connect to and so on.

OpenVPN ( http://openvpn.sf.net ) is also a terrific VPN server/client 
solution that uses cryptographic key signatures to insure cross-platform 
reliability.  It would be trivial to spread a shared subnet out over the 
same clients.  Citrix and OpenVPN share a few things in common: a) they 
both utilize SSL b) they both transport TCP/IP, while in contrast, 
OpenVPN is free and Citrix has an initial wallet-draining function.  YMMV.

-Scott

Alan Dayley wrote:

>There is talk of getting a Citrix Access Gateway
>(http://www.citrix.com/English/ps2/products/product.asp?contentID=15005)
>to provide a turnkey VPN solution for our network.  I am confused about
>support for Linux clients and, unfortunately, the people selling it seem
>just as confused.  I know there are some on this list with Citrix product
>experience.
>
>The initial goal is to provide secure email access (POP) to the LAN email
>server from clients on the internet.  Eventually there may be access to
>file shares and other LAN resources.  ie. a VPN connection.
>
>I have learned that when a remote user contacts the Citrix Access Gateway,
>it downloads a client application to the user's computer.  This client app
>provides all the VPN functionality to the remote user's computer, handling
>all the certificates, encryption, IP addresses, etc.  Very nice.
>
>Starting asking or looking for Linux and it gets muddy.  Hence, my questions:
>
>1. The Citrix VPN client that is downloaded as described above appears to
>be a Windows only application.  There is a Linux application for a client
>on a Citrix Presentation Server but that is not what we want.  Is there a
>Citrix Access Gateway client for Linux?
>
>2. If #1 is false and there is no client for Linux, can some "standard"
>Linux SSL VPN client connect to the Citrix Access Gateway?
>
>3. Excluding Citrix as a solution provider, what other VPN solutions are
>available that you would recommend?  We're looking for something as
>turnkey as possible.
>
>I know #1 and #2 are things the vendor should answer.  The reseller we
>talked to today, though smart in their experience, seemed clueless about
>connecting with Linux and could not provide straight answers.  I am still
>waiting on answers directly from Citrix.
>
>Alan
>
>
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