rfc793 tcp协议
ThisdocumentdescribestheDoDStandardTransmissionControlProtocol(TCP).TherehavebeennineearliereditionsoftheARPATCPspecificationonwhichthisstandardisbased,andthepresenttextdrawsheavilyfromthem.Therehavebeenmanycontributorstothisworkbothintermsofconceptsandintermsoftext.Thiseditionc