I have a scenario of implementing ADS synchorisation over internet . I have a local ADS running in 2003 server .I planned to install exchange server in a remote location where my production servers are located .I have Ipsec VPN connectivity between local to remote .Which is the best way to replicte ADS with exchange in this case .Do I need to install another ADC in the remote location and create atwo way trust between these DCs or I can directly sync to the remote exchange server ? Si any other way to accomplish this without VPN? I mean through direct internet? .Please give your suggestions.