Re: Proxy User Stories

Sally's SCADA system
Sally remotely operates equipment as part of a national infrastructure
project. Her network is isolated from the internet. It uses dedicated fibre
cores where possible with VPN where fibre is not available. The VPN links
pass through national carriers in remote locations and have high and
variable latency and relatively low bandwidth. Sally deploys caching
proxies at the ends of VPN links to avoid duplicate data transfer and
improve system availability and responsiveness when these links are playing
up. The system is expected to work for 15 to 20 years and will be
maintained by different organisations over this period. Long term
interoperability concerns dominate engineering decision making processes.
Sally doesn't want to add a failure mode to the system where certificates
expire and bring down the system.