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Depends on the current router. Is it using the VPN functionality of the router, or is the VPN handled by your provider (mostly obvious by another VPN router or modem from the provider, with the other side having a similar router/modem)?<br />
Obviously, if your provider is doing the VPN, then a normal router will do. If you have a normal ADSL/cable/broadband connection, the VPN is handled by you, and you have to match the current router or the router on the other side (to prevent compatibility problems)
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Depends on the current router. Is it using the VPN functionality of the router, or is the VPN handled by your provider (mostly obvious by another VPN router or modem from the provider, with the other side having a similar router/modem)?
Obviously, if your provider is doing the VPN, then a normal router will do. If you have a normal ADSL/cable/broadband connection, the VPN is handled by you, and you have to match the current router or the router on the other side (to prevent compatibility problems)

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The VPN is handled by me. I will have to verify the router being used by the provider. So if it is a Cisco gigabit router then it is best if I go with a Cisco gigabit router with VPN?
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The VPN is handled by me. I will have to verify the router being used by the provider. So if it is a Cisco gigabit router then it is best if I go with a Cisco gigabit router with VPN?

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Can you share with us your network map?
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just replaced with a regular router and same yourself the headache of the setting up the otherside to match, if its not broken don't bother fixing it.
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just replaced with a regular router and same yourself the headache of the setting up the otherside to match, if its not broken don't bother fixing it.

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I have two branch locations using Site to Site VPN between us. I need to replace a router in one of the locations. I was going to replace with a VPN router. Do I need to do this or should I just replace with a regular gigabit router.
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I have two branch locations using Site to Site VPN between us. I need to replace a router in one of the locations. I was going to replace with a VPN router. Do I need to do this or should I just replace with a regular gigabit router.

Router - VPN or not

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

A switch is a device that filters and forwards packets of data between LAN segments. Switches operate at the data link layer or the network layer of the Open Systems Interconnection (OSI) Reference Model and therefore support any packet protocol. LANs that use switches to join segments are called switched LANs or, in the case of Ethernet networks, switched Ethernet LANs. A hub is a connection point for devices in a network. Hubs are commonly used to connect segments of a LAN. A hub contains multiple ports; when a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets.

Switches / Hubs

The Internet Protocol (IP) is the principal communications protocol in the Internet protocol suite for relaying datagrams across network boundaries, organized in abstraction layers, traditionally called "Link," "Internet," "Transport" and "Application”. Its routing function enables internetworking, and essentially establishes the Internet. IP defines packet structures that encapsulate the data to be delivered. It also defines addressing methods that are used to label the datagram with source and destination information.