Protocol numbers Essay

protocol numbers be used to configure firewalls, routers, and placeholder servers. In Internet Protocol version 4 (IPv4, Request for Comments RFC 791I), the protocol number can be found in the Protocol field of an IP header.ICMP Echos argon used mostly for troubleshooting. When there are 2 hosts which have communication problems, a few simple ICMP Echo requests will show if the 2 hosts have their TCP/IP stacks configured correctly and if there are any problems with the routes packets are taking in order to get to the other side ICMP Echo schoolingType severalize ReferenceEcho Reply RFC792CodesNo Code1 Unassigned JBP2 Unassigned JBP3 goal Unreachable RFC792Codes0 Net Unreachable1 Host Unreachable2 Protocol Unreachable3 interface Unreachable4 take apartation Needed and Dont Fragment was Set5 Source Route Failed6 goal network Unknown7 Destination Host Unknown8 Source Host Isolated9 Communication with Destination internet isAdministratively Prohibited10 Communication with Dest ination Host isAdministratively Prohibited11 Destination Network Unreachable for Type of divine service12 Destination Host Unreachable for Type of Service13 Communication Administratively Prohibited RFC181214 Host anteriority Violation RFC181215 Precedence cutoff in effect RFC18124 Source Quench RFC792CodesNo Code5 airt RFC792CodesRedirect Datagram for the Network (or subnet)1 Redirect Datagram for the Host2 Redirect Datagram for the Type of Service and Network3 Redirect Datagram for the Type of Service and Host6 jump off Host Address JBPCodesAlternate Address for Host7 Unassigned JBP8 Echo RFC792CodesNo Code9 Router advertizing RFC1256Codes0 No Code10 Router Selection RFC1256Codes0 No Code11 while Exceeded RFC792Codes0 Time to Live exceeded in Transit1 Fragment Reassembly Time Exceeded12 Parameter Problem RFC792Codes0 Pointer indicates the error1 Missing a Required excerpt RFC11082 Bad Length13 Timestamp RFC792Codes0 No Code14 Timestamp Reply RFC792Codes0 No Code15 Information Request RFC792Codes0 No Code16 Information Reply RFC792Codes0 No Code17 Address Mask Request RFC950Codes0 No Code18 Address Mask Reply RFC950Codes1 No CodePORT comeService names are assigned on a first-come, first-served process, as documented in RFC6335.Port numbers are assigned in various ways, based on three ranges System Ports (0-1023), user Ports (1024-49151), and the Dynamic and/or Private Ports (49152-65535) the difference uses of these ranges is described in RFC6335. System Ports are assigned by IETFprocess for standards-track protocols, as per RFC6335. User Ports are assigned by IANA using the IETF Review process, the IESG Approval process, or the Expert Review process, as perRFC6335. Dynamic Ports are not assigned.The registration procedures for service names and bearing numbers are described in RFC6335.Assigned ports both System and User ports SHOULD NOT be used without or prior to IANA registration.