Forefront TMG 2010 Firewall Replacement

Hello, Experts!

We're currently using Forefront TMG 2010 for the 'Firewall Policy' feature only. I'd like to move to something that's going to be developed on (Microsoft announced they are mothballing Forefront).

I wanted to provide an explanation of what we use it for perhaps someone can guide us to a better solution.

1. We have limited external (public) IP addresses, but many internal resources that need to be made available externally.

2. On GoDaddy DNS, we've created DNS entries for our systems -- all tied to one external IP address.

3. On our Cisco Meraki firewall, we've created a 1:1 NAT rule that any traffic on selected ports (generally port 80) directed towards that external IP address assigned to our network should get routed to 10.0.0.XXX on our internal network.

4. At the 10.0.0.XXX address internally, we've installed Forefront that then routes traffic to/from different systems. e.g.:
sandbox1.domain.com is 10.0.0.50
sandbox2.domain.com is 10.0.0.51
sandbox3.domain.com is 10.0.0.52

That way, if some externally requests sandbox1.domain.com, the site is up and available.

I'm looking for a new way of solving #4 above.

Thanks!
workforceinsightAsked:
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btanExec ConsultantCommented:
if replacement is from MS Forefront suite, it likely be Forefront UAG. The latter is a Application Layer Gateway and is the solution for incoming access to internal resources from the Internet. Actually, Forefront TMG is installed during a Forefront UAG installation.

@ http://technet.microsoft.com/en-us/library/ee522953.aspx
@ http://blogs.technet.com/b/tomshinder/archive/2011/04/19/choosing-between-forefront-tmg-or-forefront-uag-for-publishing-scenarios.aspx

- Forefront UAG can be used to publish internal servers via Web portal or directly (similar to Forefront TMG). For website and VPN replacement use Direct Access, but do note that Direct Access is not a replacement of VPN in few scenarios, e.g. VPN for external workers who shouldn't access all services as company's workers. Of course we can implement several Direct Access implementations in one company, but external workers are enforced to have desktops in company's domain.

However, I see application delivery controller (ADC) will be way forward since you already going to consider replacement and I foresee such req as shared need more granularity and HA also...catch the below candidates - they can drill to web apps and have rule to customise outbound and inbound for that matter - but this really will be good to get principle advice before making decision...

NetScalar
http://www.citrix.com/content/dam/citrix/en_us/documents/products-solutions/netscaler-a-comprehensive-replacement-for-microsoft-forefront-threat-management-gateway.pdf

F5 Networks
http://www.f5.com/pdf/white-papers/microsoft-threat-management-gateway-alternatives-white-paper.pdf
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workforceinsightAuthor Commented:
Thanks, breadtan!

It's been a few months - does anyone know of any evolving technologies that would satisfy this need?
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btanExec ConsultantCommented:
I wss thinking of SDN but probably too complicated to worth exploration.  I saw F5 route domain using smae ip but still treated as different domain. Another is different ports but it is not new and can be constraint with port exhaustion etc
http://support.f5.com/kb/en-us/products/big-ip_ltm/manuals/product/tmos-ip-routing-administration-11-2-0/2.html
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