I'm helping a client through the process of configuring a Windows 2012 DHCP server while migrating from Linux ISC DHCP.
In the Windows New Scope Wizard dialog, there is an option to:
...specify the routers, or default gateways (plural), to be distributed by the scope.
My customer asked when it would make sense to distribute multiple default gateways to DHCP clients...
I didn't have a good answer. So I'm curious when/if this functionality is appropriate, and does it hinge heavily on certain clients systems (e.g. Windows PCs)? I'd like to hear about practical scenarios.
Any given connection defines a gateway as non-operational (dead) when a packet sent to the gateway must be retransmitted more than half of the number of times specified in the value of the TcpMaxDataRetransmissions entry. The connection switches to the next gateway in the list in the DefaultGateway or DhcpDefaultGateway entries. The system defines a gateway as dead when more than 25 percent of its connections have switched to the next default gateway in the list.
Source: technet.microsoft.com/en-us/library/cc960464.aspx