Using a GRM agent cache to access the Internet also

Requirements for a cache to access the Internet

A NetCache appliance configured as a GRM agent can be used to access content on the Internet, as well as to handle CDN content. However, Network Appliance recommends that you use your GRM agent caches to handle only CDN content delivery, which provides your customers with the most preferential service possible.

If you must use the same NetCache appliance to provide both CDN content delivery and Internet service, you must do the following in addition to GRM agent configuration to redirect requests for content on the Internet to your NetCache appliances:

Deploy an L4 or L7 switch or a WCCP router in front of the center or edge cache
Configure the center or edge cache for transparent proxying

For a deployment with a GRM DNS server

A local DNS nameserver sends DNS queries for domains for which the GRM DNS server is authoritative to the GRM DNS server. The GRM DNS server then returns the IP addresses of center and edge caches to the client.

A local DNS nameserver sends DNS queries for servers not hosted by the CDN up the hierarchy of DNS nameservers until a match occurs. The L4 or L7 switch WCCP router redirects the client request to one of the caches. If a cache miss occurs, the cache fetches the requested content from the appropriate origin server on the Internet.

For a deployment with a GRM L7 server

After a client request is directed to a GRM L7 server (through one of the methods described in About a GRM L7 server--Application-level (L7) redirection), the GRM L7 server rewrites the request. The L4 or L7 switch or WCCP router redirects the client request to one of the caches. If a cache miss occurs, the cache fetches the requested content from the appropriate origin server on the Internet.