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I currently have three locations I am dealing with. &nbsp;I have location 1 and 2 that are in the same forest. &nbsp;Location 1 is the main domain with location 2 apart of the same domain. &nbsp;Location 1 has a domain trust set up with location 3 which is a totally seperate forest. &nbsp;I can share files to and from location 1 from both location 2 and 3. &nbsp;However, Location 3 cannot see location 2 and location 2 cannot see location 3. &nbsp;I can't ping from either 2 or 3. &nbsp;Location 2 and 1 are in the same domain just for example abc.com. &nbsp;How can I get def.com to talk to location 2? 
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I currently have three locations I am dealing with.  I have location 1 and 2 that are in the same forest.  Location 1 is the main domain with location 2 apart of the same domain.  Location 1 has a domain trust set up with location 3 which is a totally seperate forest.  I can share files to and from location 1 from both location 2 and 3.  However, Location 3 cannot see location 2 and location 2 cannot see location 3.  I can't ping from either 2 or 3.  Location 2 and 1 are in the same domain just for example abc.com.  How can I get def.com to talk to location 2? 

Adtran router configuration

Windows Server 2003 was based on Windows XP and was released in four editions: Web, Standard, Enterprise and Datacenter. It also had derivative versions for clusters, storage and Microsoft’s Small Business Server. Important upgrades included integrating Internet Information Services (IIS), improvements to Active Directory (AD) and Group Policy (GP), and the migration to Automated System Recovery (ASR).

Windows Server 2003

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.

Routers

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.