http://www.rfc-editor.org/rfc/rfc1028.txt
RFC 1028: Simple Gateway Monitoring Protocol, J. Davin, J.D. Case, M. Fedor, M.L. Schoffstall1987-11-01T23:00:00-00:00This memo defines a simple application-layer protocol by which management information for a gateway may be inspected or altered by remote users. This proposal is intended only as an interim response to immediate gateway monitoring needs.