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tcpdump to see what you are getting from the switch

This is a nice tcpdump command line to see what you are getting from the switch as far as duplex and speed tcpdump -nn -vvv -s 1500 -c 1 -i eth0 ‘ether[20:2] == 0x2000’ For linux the output should look like tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 1500 bytes 08:13:11.630525 snap 0:0:c:20:0 CDP v2, ttl: 180s, checksum: 692 (unverified) Device-ID (0x01), length: 9 bytes: ‘SWITCH1’ Version String (0x05), length: 190 bytes: Cisco IOS Software, CBS30X0 Software (CBS30X0-LANBASE-M), Version 12.2(25)SEF1, RELEASE SOFTWARE (fc3) Copyright (c) 1986-2006 by Cisco Systems, Inc. Compiled Tue 23-May-06 15:26 by antonino Platform (0x06),… Continue Reading

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Building Demolished from the Ground Up Looks Better than New

A 15-story office block in the heart of London is being demolished backwards in order to build a skyscraper in its place. Demolishers are working up from the ground level upwards, dismantling each floor to reveal the concrete core of the P&O building. Find out why, and the new skyscraper replacing it, after the jump. When the P&O building was constructed in 1965, each floor was hung from a huge beam at the top of the tower and supported by the central core. According to Matthew White, project director, the weight has to be removed from the structure from the… Continue Reading