Question

Having two internet Connections with ISA Server

Asked by: hadoka

Dear All ,

I had a network managed by DC , & ISA Server , Recentrly i got a new internet connection for Doc. Controllers , I need to configure them to work on ISA server using the new internet connection and the other users use the same ISA server but for the old Internet Connection .. and i would like to prefere to keep the Users with the new connection in the same subnet ..

Note Server is having 4 nic , two of them already configured fo the old internet connection & the Other Users ..  other 2 is ready for any configuration ..


Seconf thing .. I need unauthinticated users to use also the ISA server on the old Internet Gateway ,, Namely they aren't connected to the dc and they need to access internet ,, and i need to controll there access through that ISA server ..

I know its pretty hard to do so .. but i know some one here could help

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Asked On
2008-12-27 at 02:19:20ID24010717
Tags

Multiple Gateways

,

ISA Server

,

Two Internet Connection

Topics

Network Design & Methodology

,

MS Forefront-ISA

,

Network Routers

Participating Experts
5
Points
500
Comments
11

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Answers

 

by: keith_alabasterPosted on 2008-12-27 at 13:16:51ID: 23249523

Won't happen - Not possible through ISA. Basic ISA README file in the setup guides.

Keith

 

by: hadokaPosted on 2008-12-27 at 13:20:26ID: 23249532

no any solution for my both questions??????????

 

by: keith_alabasterPosted on 2008-12-27 at 13:27:50ID: 23249560

Two questions should be just that - two questions. However, as it is Christmas....

Two internet connections is a non starter through ISA - as I say, basic ISA setup guidance notes explain this. The only time two connections can be used is if you were routing traffic out based on IP addresses as you could use the OS routing tables - and you would need a third nic in the ISA. Anything else, forget it.

The second is a no-no also for the same reason. ISA uses the routing tables based on the host OS - it is not a router itself, therefore it cannot send one group of users one way and another group of user a different way - regardless of whether they are authenticated or not.

 

by: MrMandersonPosted on 2008-12-27 at 16:59:24ID: 23250026

As Keith has already said you cannot achieve this via ISA. You will need to implement a router infront of the ISA firewall which deals with the load balancing / failover for the 2 internet connections. This type of router will of course require dual wan ports / ATM that supports load balancing / failover.

Regards
Steve


 

by: keith_alabasterPosted on 2008-12-28 at 01:09:37ID: 23250911

That will not solve the questions. The external router will not know (or care) about which group is making the Internet connection. Routing (by design) is based on layer 3 traffic and will route based upon the target ip address, not the username or mac address of the source.

 

by: Roachy1979Posted on 2008-12-28 at 09:36:36ID: 23252083

One way I can think of doing it is via login script (set in AD).  You could use a Kix Script to define a different default gateway for the any users that were domain members.  This is demonstrated here:

http://www.kixtart.org/forums/ubbthreads.php?ubb=showflat&Number=144072&site_id=1#import

That said you would still need an additional ISA box to do this for the 2 separate gateways.

If cost is a prohibitive issue and you want to impose content filtering, then look at (google) Squid/Squidguard/DansGuardian to see what some options are for non AD joined clients.

The other option is to build the second ISA and use Group Policy to specify a Proxy server in the browser settings.  Assuming all users use IE that should work.


 

by: HayesJupePosted on 2008-12-28 at 23:37:24ID: 23254329

Guys,

            this is possible - but not with one ISA.

You could setup a 2nd ISA... for gods sake dont use mutliple default gateways on your network, simply use group policy to make the specified users use the second ISA - as long as its only web traffic - it will work.

 

by: keith_alabasterPosted on 2008-12-29 at 01:11:30ID: 23254534

Yes, it is standard capability with two ISA's (naturally) because you are setting up two environments, regardless of whether you put them into individual or dual arrays. As long as you are happy to pay for licensing two ISA servers. However, this was not the question asked. Given the environment in place and the approach currently being taken, it cannot be done.

Putting in a different environment, by buying new, additional hardware, software and new licenses etc then frankly, anything can be done.
Keith

 

by: HayesJupePosted on 2008-12-29 at 02:55:23ID: 23254880

true - although it may not have been exactly the question asked - it is a viable and supportable solution to the question asked - as lets face it... there is no solution for him with one ISA server.

 

by: keith_alabasterPosted on 2008-12-29 at 03:06:31ID: 23254909

Exactly :)

 

by: ValutusPosted on 2009-01-01 at 18:19:48ID: 23277227

Its quite likely that this suggestion will not be suitable for your environment ,as you sound like you mainly utilise Microsoft however:

In addition to being able to policy route traffic out specific interfaces, you need to be able to tag the packets as they come in and keep track of the connections and return them out the correct interfaces.

One such solution is to replace the ISA server with something like OpenBSD / FreeBSD + Squid + Squidguard / Dansguardian.  In addition to that, the easiest solution would be to put the users in specific ip ranges (i.e. use DHCP reservations)

alternatively you could run 2 or more coppies of squid listening on differant ports with differant "tcp_outgoing_address" configured to use the approporiate outbound interface.  

I implemented such a system for a customer of mine a couple of years ago.  They have multiple tenants sharing an office building.  They provide internet access to each tenant, with multiple internet connections for failover and load balancing.

I achieved this by implementing a FreeBSD server, with multiple coppies of squid running on it (in Jails though you shouldn't need to go that far) listening on differant ports.

20120131-EE-VQP-002

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