Using icmp reachability,trace a route,path mtu, Computer Network Security

 

USING ICMP TO TEST REACHABILITY:

 ICMP can also be used to test several tools. An Internet host A, is reachable from another host B, if data packets can be send from A to B. Ping function tests reachability. It transmit datagram from B to A, that sends back to B. it uses ICMP echo reply and echo request messages. Internet layer added code to reply to incoming ICMP echo request messages.


USING ICMP TO TRACE A ROUTE:

 List of all routers on path from A to B is known the route from A to B. The intermediate routers transmit ICMP time exceeded message to the host and receiver transmits an ICMP destination unreachable message to the host.

 Tracert (Windows version) gives ICMP echo messages with increasing TTL. Router that decrements TTL to 0 provides ICMP time exceeded message, with router's address as host address. First, with TTL 1, gets to first router, which discards and transmits time exceeded message. Next, with TTL 2 goes through first router to second router. It continues until an ICMP echo reply data packet from destination is received.

USING ICMP FOR PATH MTU:

 Fragmentation should be removed. Source can manage outgoing datagrams to avoid fragmentation. Source calculates path MTU- smallest network MTU on path from host to destination. Source probes path using IP packet message with don't fragment flag. Router acts with ICMP fragmentation needed message. Source transmits smaller probes until destination reached.

 

 

Posted Date: 8/1/2012 9:33:58 AM | Location : United States







Related Discussions:- Using icmp reachability,trace a route,path mtu, Assignment Help, Ask Question on Using icmp reachability,trace a route,path mtu, Get Answer, Expert's Help, Using icmp reachability,trace a route,path mtu Discussions

Write discussion on Using icmp reachability,trace a route,path mtu
Your posts are moderated
Related Questions
Dynamic Packet Filtering Dynamic Packet Filtering is also referred to as stateful firewalling. Here the firewall maintains the status of connections as well. When a connection

Categories of Controls Controlling risk through mitigation, avoidance or transference is accomplished by implementing controls. There are 4 effective approaches to select the co

DEPLOYMENT AND IMPLEMENTING OF AN IDS The strategy for deploying IDS should consider various factors. These factors will determine the number of administrators required to insta

QUESTION (a) Which PKI (Public Key Infrastructure) model is typically favored by business organization? (b) Give one possible use of the "extensions" field of an X.509 certi

DIRECT INDEXING It is less usually known method. It is possible only is cases where protocols address are given from a compact range. In the diagram below an example of direct

Question: a) Give two reasons why the building-block approach is favoured to the traditional network design approach. b) With reference to network monitoring parameters, dis

QUESTION 1: a) Differentiate between a routing protocol and a routed protocol. b) Describe any three design goals of Routing protocols. c) Lists some of the features shared

Question: (a) Explain the following terms: Information Communication Technology, Operating System and Application Software. (b) Define what a computer is, give four anatomi

To master the complexity one must apply the given points. CONCENTRATE IN UNDERSTANDING THE CONCEPTS: Instead of details of wires used to connect computers to a specif

QUESTION (a) What do you understand by a VLAN? Provide one advantage of using a VLAN. (b) What is a trunk port in a VLAN? (c) A VLAN will be created using one or more