TCP IP Analysis and Troubleshooting by Laura Chappell

By Laura Chappell

Introductory consultant to packet-level research and troubleshooting of TCP/IP networks. This e-book defines the common packet constructions noticeable on a TCP/IP community (IP, UDP/IP, TCP/IP, ICMP, ARP constructions) in addition to the sphere buildings and performance of those easy packets. The ebook additionally defines the simplest instruments for troubleshooting TCP/IP networks. comprises bankruptcy assessments and numerous hint documents for perform.

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Com. I suggest that you download and review these files. Keep checking out there for more files as we release our lab files (with some documentation) publicly. When you view these trace files, remember to focus on the summary portion first – get a general feel for the traffic and look for recognizable patterns. Then begin to focus on one conversation. Make sure you get a good screen capture utility that will help you document your findings in a graphical manner, as well. com. PRN – This trace shows a typical ARP lookup sequence.

This field is only in use if the packet is a fragment. Time to Live Field This field denotes the remaining lifetime (in seconds and hops through routers) of the packet. Typical starting TTL values are 32, 60, and 128. 1 had not crossed a router in Observation #2. ) Default TTL values are incorporated into the vendor's TCP/IP stack. Applications (such as traceroute) can override these defaults as desired. Each time a packet is forwarded by a router, the router must decrement the TTL field by 1. If the router must hold the packet in a queue for an extended period of time (longer than one second), it must decrement that TTL value by the number of seconds the packet was held in the queue.

Interesting, eh? 3. The router strips off the MAC header – now it holds a naked little IP packet in its hands. 4. The router examines the destination IP address and looks in its routing table for a host entry (a route entry that matches the entire destination address), a network entry (a route entry that matches the destination network address), or a default gateway (a place to send all packets destined to unknown addresses). 5. The router decrements the TTL value by 1 (if the packet is held in the router’s queue for more than a second, it should also be decremented by the number of seconds it was held).

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