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Forward caches
Also known as forward proxy caches, they are usually deployed by Internet service providers (ISPs), schools and corporations to save bandwidth. In order to use the cache in this way you need to configure individual browsers with the network settings of the cache.
In the following example a CACHEBOX is deployed on the same network as the users. It can in fact be deployed anywhere on the LAN, WAN or Internet, however it generally makes sense to have it as close to users as possible. LAN speeds are usually much faster than WANs so files will be sent to users quicker giving them a much better user experience.
A transparent forward cache, also known as an interception proxy caches, is a type of forward proxy that doesn’t require clients to be configured to use it. There are multiple ways of achieving this, including having a router/firewall send traffic to a forward cache or placing the cache directly in-line.
Gateway mode
In the example below the clients have their default gateway set as the CACHEBOX, which has its default gateway set as a NAT firewall. The CACHEBOX redirects HTTP traffic via its cache and passes the rest directly on to the NAT firewall.
However, because it introduces a single point of failure into the network this type of deployment is generally discouraged. If it is used it is only really suitable for small networks.
WCCP deployment
In the example below a Cisco router ISP is configured to separate out web traffic automatically and forward it transparently via a cluster of CACHEBOXs, using WCCP.
Reverse caches
Also known as gateway caches, surrogate caches, or web accelerators, reverse caches are deployed in front of web servers. They operate on behalf of the origin or content server, and are essentially invisible to clients. A number of gateway caches can work together to form a Content Delivery Network (CDN.
The following diagram shows a typical reverse caching set up, using a cluster of CACHEBOXs and three content servers:
Because most of the queries are served from the CACHEBOX cluster it reduces the load on the content servers.
"Quite simply, the CACHEBOX is the ideal solution for ISPs operating where internet bandwidth is in short supply or very expensive."
Teledata ICT
"We installed our CACHEBOX two weeks ago and it’s alleviated half of that port 80 traffic! Even in that short space of time, the difference has been dramatic - it was an ‘Oh my god’ moment from day one."
Esplanade Wireless
"Since installing CACHEBOX we’ve seen tremendous benefits...We regularly get hit rates of 40% and with large object caching picking up the web videos, we’ve been adding a lot more subscribers to our network."
Karib Cable Kelcom
"We chose ApplianSys because its products address the fundamental IT issues my customers face. They’ve made them user friendly, reliable, and backed them up with excellent support."
Computer Facilities
"CACHEBOX has done exactly what it says on the tin. The system has had 100% uptime and it’s been a case of ‘set-and-forget'."
Trafficmaster
"With the ApplianSys solution we make significant savings on our internet access, it's almost a third of what we were paying previously."
Leeds Learning Network
"The ApplianSys solution has given us flexibility and control over our own filtering. With it we can now set appropriate levels of filtering."
East of England Broadband Network
"We have the first solution which can do everything we need - control, auditing, security - and deliver serious performance. Serious caching, sensible prices."
Exeter College
"It's reassuring for us that support's there, that ApplianSys cares how we're getting on."
6th Form College, UK
