In my experiences with network teams, they seem to not understand how IBM z networking (specifically OSA hardware) works. Their reality of having a single physical wire carrying potentially over 100 IP addresses is beyond their "norm". Meanwhile, many IBM z SysProgs do not have mucn experience with TCP/IP (or VTAM, for that matter), which can impede working with the network team to solve connectivity issues. This presentation is a high-level review of TCP/IP v4 addressing and routing, along with common IBM z debugging tools that can be used to provide the networking team with connectivity data. The concepts and tools are common across all IBM Z operating systems, but I will touch on the implementation differences between z/VM, z/OS, VSEn and common Linux implementations.
