We just released an update of the IBM Redbook: Enhanced Networking on IBM z/VSE.
The Redbook is here . It extends the information, that is provided in Security on IBM z/VSE, SG24-7691 .
Below I added the table of contents:
Chapter 1. Networking options overview
Chapter 2. TCP/IP for VSE/ESA
Chapter 3. IPv6/VSE
Chapter 4. Fast Path to Linux on System z
Chapter 5. OpenSSL
Chapter 6. Comparison of stacks and protocols
Appendix A. API reference