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ISP Redundancy Mode

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ISP Redundancy Mode - 29.Sep.2009 4:41:20 PM   


Posts: 144
Joined: 26.Mar.2002
Status: offline
Hi folks,

Anyone know whether ISP redundancy mode will support mixed networking routing relationships? I'll explain.

I have two Internet facing NIC's, one is configured with ISP A with a public IP (e.g., the second is via an RFC1918 perimeter (, which then connects onto the Internet via a router with a public IP.

Do I need to configure I three-legged setup within TMG or will a back-to-back configuration do? It seems that TMG gets confused with the network relationship, since the route onto ISP A needs to be NAT'd and onto ISP B, it needs to be routed.

Is this a supported configuration for ISP redundancy?

Post #: 1
RE: ISP Redundancy Mode - 1.Oct.2009 11:47:18 AM   


Posts: 50013
Joined: 10.Jan.2001
From: Texas
Status: offline
Hi Mylo,

Good question. I would think that it would not matter if you're using a private address on one of the external interfaces, as long as you're not using that network ID in a definition for any other TMG Networks.



Thomas W Shinder, M.D.

(in reply to mylo)
Post #: 2

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