Question about Cisco Computers & Internet
There are two buildings and these buildings have one domain. also each building has one ISA server. Now i want these two ISA servers to connect that domain.....is that possible?
Assuming that your objective is to have an ISA server to protect each building's separate internet connection while maintaining a separate link for the internal networks between buildings then the answer is yes.
Here are a few things to watch:
1. Each building needs to be on its own subnet
2. You can connect the buildings to each other through ISA in several ways or by using a layer 3 switch or router on each end. Either way, you'll need to provide routes between the two private networks.
3. If you only have on DC and it's handling all DHCP you'll need to make sure that the switches can handle DHCP helpers and configure this appropriately. If you need help on this, let me know.
4. If you want to have the ability to quickly configure one ISA server to handle traffic for the opposite building in the event of an internet failure you'll need to configure a short DHCP lease. That way you can re-configure the gateway and get it out quickly to the clients after a failure, i.e. if you can stand an hour without internet easily, a one hour lease would be appropriate. The price for this is increased DHCP overhead traffic on the network.
If you are looking for a true high availability solution where you'll have no downtime on either side if the internet goes down then you will need ISA Enterprise on each end and the implementation will be quite complex and well beyond the scope of what we can do here.
If any of my assumptions are wrong, let me know and I'll try to fill in the holes.
Posted on Jul 16, 2009
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Posted on Jan 02, 2017
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