Utility to block traffic to one specific IP address

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Hello,

Running Windows Server 2003 SP2 on a multi-homed machine. Is there a
Windows utility that I can use to temporarily block all traffic to
(and possibly from) a specific IP address on the server?

For example, server has following addresses

10.12.1.2
10.12.1.3
10.12.1.4

I want to temporarily block all incoming traffic to 10.12.1.3 on the
fly. Meaning, I don't want to use something that will require a reboot
before it will take effect. Also, I need to be able to unblock it just
as quickly. I need to run a series of tests where I will be blocking
and unblocking the IP repeatedly. IPSec sounds like one option. Are
there other options?

All the traffic will be restricted to an internal LAN.

Thanks,
pimy

.

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