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
Students were asked about search engine they used.90 of them said they used google chrome,70 used Internet Explorer,40 used Mozilla Firefox,30 used Google Chrome and Internet Explo

QUESTION: (a) Briefly explain the steps involved in Network Simplex Method. (b) What data structures you would expect in the Network Simplex Method. Show the data struct

Topic -Spam is an ever-growing problem, with some network administrators reporting that 90% or moreof the email delivered to their mail servers is spam. Identify and briefly evalua

Encryption Key Size When using ciphers, the size of crypto variable or key is quite important as the strength of many encryption applications and cryptosystems were measured by

QUESTION (In this question, you will need to use the ISO 27001:2005 and ISO 27002:2005 standards) For each of the situations below, comment on the following: 1. Mention

Question 1: Why do we need a Law of Contract? a Explanation Reasons to have a law of contract b Explain the close procurement project process - Explanation (causes,

why is it that sometime we put password in our account to login or signup and it would not work?

PROCESSING AN INCOMING ARP MESSAGE When an ARP message reaches, the protocol specifies that the receiver must operate two basic steps. First the receiver finds the sender's add

QUESTION (a) Consider the following digital bit stream 01001100 is to be encoded in: i. NRZ-I ii. Pseudoternary iii. Manchester iv. Differential Manchester Show th

what is the guaranteed quality of this coursework? how many days it take for 10-12 pages? how much will be? thanks