Appendix B describes the current connectivity assumptions of commonly deployed grid software used in LCG. The LCG Security Group considers these assumptions to be inappropriate for deploying a production grid and recommends that developers and designers develop ways to more effectively constrain the required access of future systems. Specifically, whilst application developers MUST NOT rely on the availability of any connectivity not specified in this document, that described in Appendix B should also NOT be read as an agreed minimal set. For instance, by requiring that network communications pass into and out of a site through one or more.
