The IPv6 Webcache and Server Farm

The IPv6 user clients and the webcache they access for HTTP requests are not directly attached to the TWCB router and can not assure a path from the cache servers back to the user clients that transit the TWCB router. Therefore, the IPv6 Cache1 webcache requires that source and destination NAT be configured.

The destination IP address for Cache1 is 2000:1::10 and is contained in the IPv6 standard dest1_acl access list. The source NAT pool address range is 2000:1:2::/48.

Cache1 uses the default HTTP port: 80. A bypass list denies TWCB functionality for web requests to web host sites 3000:1::/48 because these sites require IP address authentication for user access. Cache1 configuration denies TWCB functionality to end-users 2000:2::1:2:0/64 as specified by IPv6 access list deny1_acl.

The s1IPv6Server server farm is configured with cache servers 4000:1:2::5-7. All cache servers are configured the same and our example shows the CLI input for cache server 4000:1:2::5.

The predictor method for the s1IPv6Server is the default predictor destination IP hash.

s1IPv6Server cache servers will use an ICMP ping probe with parameter values changed to an interval of 4 seconds and the number of retries to 5. The maximum number of connections per cache server will be configured for 800.