More links to DDN Protocol Handbooks in dtic if interested. Their search capabilities may be improving. barbara V1 https://apps.dtic.mil/sti/pdfs/ADA166324.pdf V2 https://apps.dtic.mil/sti/pdfs/ADA166325.pdf V4 but from Internet Protocol Handbook (DNS) https://apps.dtic.mil/sti/pdfs/ADA214698.pdf