By Joseph D Sloan
ISBN-10: 059600186X
ISBN-13: 9780596001865
Through the years, millions of instruments were built for debugging TCP/IP networks. they vary from very really expert instruments that do one specific activity, to generalized suites that just do approximately every little thing other than exchange undesirable Ethernet cables. Even larger, lots of them are totally loose. there is just one challenge: who has time to trace all of them down, type via them for the simplest ones for a selected function, or work out tips on how to use them?Network Troubleshooting instruments does the paintings for you-by describing the simplest of the freely on hand instruments for debugging and troubleshooting. you can begin with a lesser-known model of ping that diagnoses connectivity difficulties, or tackle a way more finished software like MRTG for graphing site visitors via community interfaces. there is tkined for mapping and immediately tracking networks, and airy for shooting packets and debugging low-level problems.This ebook is not just concerning the instruments on hand for troubleshooting universal community difficulties. It additionally outlines a scientific method of community troubleshooting: the best way to record your community so that you know the way it behaves less than common stipulations, and the way to contemplate difficulties once they come up, so that you can clear up them extra effectively.The subject matters coated during this booklet contain: * figuring out your community * Connectivity trying out * comparing the trail among community nodes * instruments for shooting packets * instruments for community discovery and mapping * instruments for operating with SNMP * functionality tracking checking out program layer protocols * software program resources if you are concerned with community operations, this booklet will prevent time, funds, and useless experimentation.
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Extra info for Network Troubleshooting Tools
Example text
Keep in mind that the use of these tools has political implications. You should be safe scanning your own system, but you are on very shaky ground if you scan other systems. These two tools make no real effort to hide what they are doing, so they are not difficult to detect. Stealth port scanners, however, send the packets out of order over extended periods of time and are, consequently, more difficult to detect. Some administrators consider port scans adequate justification for cutting connections or blocking all traffic from a site.
Sometimes when setting up their computers, people will copy the configuration from other computers, including the supposedly unique IP number. A rogue DHCP server is another possibility. If you suspect one of your hosts is experiencing problems caused by a duplicate IP number on the network, you can shut down the interface on that computer or unplug it from the network. ) Then you can ping the IP address in question from a second computer. If you get an answer, some other computer is using your IP address.
239 00-60-97-06-22-22 Type dynamic dynamic The command netstat -r gives the computer's routing table: C:\>netstat -r Route Table 33 =========================================================================== Interface List 0x1 ........................... 00 10 5a a1 e9 08 ...... 00 00 00 00 00 00 ...... edu:pop3 State ESTABLISHED ESTABLISHED ESTABLISHED TIME_WAIT As you can see, the format is a little different, but it supplies the same basic information. ) You can use netstat -a to get the active connections and services.