BlueCoat Definitions

Deploying the ProxySG Appliance: https://bto.bluecoat.com/support/basic-proxysg-deployment-self-help

Deployment Methodologies: https://bto.bluecoat.com/doc/13364

Reverse Proxy with SSL: https://bto.bluecoat.com/doc/8412

Explicit Mode: In an explicit proxy configuration, the client (browser) is explicitly configured to use a proxy server, meaning the browser knows that all requests will go through a proxy.  The browser is given the IP address and port number of the proxy service (the ProxySG). You could also use a Proxy Auto-Configuration (PAC) file to configure the browser to download the proxy settings from a Web server. When a user makes a request, the browser connects to the proxy service and sends the request. The disadvantage to explicit proxy is that each desktop must be properly configured to use the proxy, which might not be feasible in a large organization.

Transparent Mode: When transparent proxy is enabled, the client (browser) does not know the traffic is being processed by a proxy other than the origin server. To enable the ProxySG to intercept traffic sent to it, you must create a service and define it as transparent. The service is configured to intercept traffic for a specified port, or for all IP addresses on that port. A transparent HTTP proxy, for example, typically intercepts all traffic on port 80. To make sure that the appropriate traffic is directed to the ProxySG, deploy hardware such as a Layer-4 switch or a WCCP router, or the ProxySG’s software bridge that can redirect selected traffic to the appliance. Traffic redirection is managed through polices you create on the redirection device

Deployment Options: Inline, Explicit, Transparent, SPAN Port Deployment

Reverse Proxy: In computer networks, a reverse proxy is a type of proxy server that retrieves resources on behalf of a client from one or more servers. These resources are then returned to the client as though they originated from the server itself (or servers themselves).[1] While a forward proxy acts as an intermediary for its (usually nearby) associated client(s) and returns to them resources accessible on the Internet, a reverse proxy acts as an intermediary for its (usually nearby) associated server(s) and only returns resources provided by those associated server(s).

Forward Proxy: Forward proxies are proxies where the client server names the target server to connect to. Forward proxies are able to retrieve from a wide range of sources (in most cases anywhere on the Internet).The terms “forward proxy” and “forwarding proxy” are a general description of behavior (forwarding traffic) and thus ambiguous. Except for Reverse proxy, the types of proxies described in this article are more specialized sub-types of the general forward proxy servers.

WCCP: The Web Cache Communication Protocol (WCCP) is a Cisco-developed protocol that allows certain Cisco routers and switches to transparently redirect traffic to a cache engine such as a ProxySG appliance. This traffic redirection helps to improve response time and optimize network resource usage.The ProxySG can be configured to participate in a WCCP scheme, in which WCCP-capable switches or routers collaborate with ProxySG appliances to form one or more groups that service requests from clients.  https://bto.bluecoat.com/sgos/ProxySG/Acceleration_WebGuide/Content/01Concepts/wccp_co.htm

Configuring WCCP: https://bto.bluecoat.com/doc/435

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