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at a command prompt to get similar text-based output. A quick comparison of the IP configuration information of two workstations can lead to rapid problem resolution. Of course, any time you compare workstations, make sure you’re comparing apples to apples; they should be on the same subnet. Here’s what to compare: • IP addresses—The IP addresses of the workstations should be the same, except for the node numbers (192.168.10.5 and 192.168.10.6 are the same ; 192.168.9.5 and 192.168.11.6 are not). • DNS server(s) • WINS server(s) Chances are, if these settings are different, you’ve got a configuration problem rather than a hardware or network problem. Previous Table of Contents Next
Informational Commands Previous Table of Contents Next If the problem is more thorny than a configuration issue, it can be useful to know the perspective of the problem workstation; that is, what the workstation can see, what it cannot see, and the state of various informational commands as run from that workstation. You can use various informational commands, as listed in Table 11.1, to see the workstation’s perspective on the network (these commands apply for both Windows 9x and NT). Table 11.1Informational Commands Command Description netstat -r Shows TCP/IP routing table. netstat -a Shows all TCP/IP sockets in use (client and server). arp -a Displays the MAC-to-IP address translation table. ping hostname or address Checks basic IP connectivity with hostname or address. tracert hostname or address Traces the route that a packet takes from the current workstation to hostname or address. Shows each router that the packet goes through on its way to hostname or address. nbtstat Checks the NetBIOS name table. All these commands (except nbtstat) are more or less lifted from UNIX; see Hour 12, “UNIX Networking Basics,” for examples of their use in basic TCP/IP troubleshooting. Hour 18 provides some in-the-trenches techniques. net You should also be familiar with the net command. Type net | more at the command prompt. This will show you the multitudinous net commands you can run. These are mostly file and print related; some relate to networking configuration in general, as well. Some of these
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To access the contents, click the c
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Workshop Q&A Quiz Answers to Quiz Q
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Eminent Domain TCP/IP Graffiti DHCP
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Configuring Your Proxy Proxy Troubl
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Socks Stuff AOL Instant Messenger A
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Table of Contents Introduction: Get
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about your more complex network iss
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Tell Us What You Think! Table of Co
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with me when I was first getting st
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NIC (network interface card) The te
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MAC Attack Previous Table of Conten
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Routers Previous Table of Contents
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technology as the future of local a
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for a TCP/IP address in a large net
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Sprechen Sie DLC? Previous Table of
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socket 80 of the TCP/IP address 167
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program in a name entry; entering t
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WINS Previous Table of Contents Nex
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kind and spit them out as fast as p
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Previous Table of Contents Next Hou
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Figure 2.1 A simple logical map. If
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Figure 2.4 A physical documentation
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the room). This way, you can read t
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un on the server at 9:50 on Monday
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Previous Table of Contents Next Par
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Beware of Vendor Your vendor probab
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call the risk/benefit ratio—the a
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Workshop Q&A Previous Table of Cont
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If you determine that it’s just o
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(see Figure 4.2). Figure 4.2 An Eth
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Division of Labor Previous Table of
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just that the network itself is at
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A Each situation is obviously diffe
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Ruling out is particularly effectiv
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Drive duplication can be a big help
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Previous Table of Contents Next Aft
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5. When you log problems on a given
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if they have a plan, they are going
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Is It a Virus, Doc? Previous Table
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O: Only have tried two other Intern
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A Remember that what a user says is
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Previous Table of Contents Next Loo
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Figure 7.1 Searching several sites
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You’ll also find forums run by th
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Previous Table of Contents Next
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a server but you think it should be
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Workshop Q&A Previous Table of Cont
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Name Brand Versus Generic PCs The c
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static electricity that may have bu
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SIMMs and DIMMs There are two kinds
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Page 111 and 112: This is called looping back, becaus
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Page 115 and 116: Figure 8.4 The NT Task Manager’s
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Page 119 and 120: Probably the most important thing t
Page 121 and 122: Hour 9 Ethernet Basics Previous Tab
Page 123 and 124: which translates into lots of colli
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Page 127 and 128: designation is simply an industry-s
Page 129 and 130: Down, Down, Down Previous Table of
Page 131 and 132: A Collisions cause other errors, su
Page 133 and 134: Follow the Rules: Share and Enjoy!
Page 135 and 136: Previous Table of Contents Next Err
Page 137 and 138: Token Analyzers Finding a NAUN is r
Page 139 and 140: Token-Ring does not have any hard-a
Page 141 and 142: Down Town Previous Table of Content
Page 143 and 144: C. 1, 16 D. 4, 16 Answers to Quiz Q
Page 145 and 146: Going Native Although Windows allow
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Page 149 and 150: machine with the username Administr
Page 151 and 152: protocol. They therefore relied on
Page 153 and 154: Previous Table of Contents Next Fol
Page 155 and 156: Most of the time, you’ll not want
Page 157 and 158: allows you to manage them and check
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Page 161: Figure 11.6 Showing bindings for al
Page 165 and 166: Figure 11.8 A monitor session. We k
Page 167 and 168: case you need them. 2. What does SM
Page 169 and 170: a great example of client/server. W
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Page 173 and 174: The first number is the process ID
Page 175 and 176: tcp 0 0 frotz.frob.com.telnet 200.1
Page 177 and 178: Name Game Previous Table of Content
Page 179 and 180: The next thing you need to find out
Page 181 and 182: A UNIX security and file permission
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Page 185 and 186: the amount of time used or data sen
Page 187 and 188: NLMs In addition to accepting comma
Page 189 and 190: NLM Party Previous Table of Content
Page 191 and 192: Again, make sure you are running th
Page 193 and 194: Big Monitor Is Watching Previous Ta
Page 195 and 196: Then, eureka! During one session of
Page 197 and 198: Protocol Problems Previous Table of
Page 199 and 200: Figure 13.10 UNICON will configure
Page 201 and 202: Summary Previous Table of Contents
Page 203 and 204: 7. The TCP/IP protocol and basic se
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Page 207 and 208: Configuring in Comfort Previous Tab
Page 209 and 210: Router 1 in Figure 14.3 is shown in
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Route in Peace: Routing Protocols P
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get to a network segment that until
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Figure 14.4 How two stations talk v
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Tree Trunks Previous Table of Conte
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garbage characters like these on a
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A. Add Router 99 to Router 88’s r
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Let’s lay out some definitions he
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Packet-Filtering Routers Previous T
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eceptionist hangs up one line (the
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from the proxy server without causi
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Proxy Trouble Previous Table of Con
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3. The proxy server resolves the na
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Q My vendor says that its firewall
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• Make checklists of tasks that m
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Joe User Previous Table of Contents
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groups | grep -q -w network && { ec
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If you’re going to add or replace
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Policies Previous Table of Contents
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in this hour—will pay off as you
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Q Which duplication software is rig
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Hour 17 Where Do I Start? Previous
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As optimistic as we’d all like to
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• PCAnywhere • ReachOut • Rem
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IPX/SPX Previous Table of Contents
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Q What happens if I ping the loopba
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correlations? A. netstat -a B. trac
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equire that the application files t
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The File and Print Blues Previous T
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With five potential points of failu
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In some cases, a slight difference
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Application Celebration Previous Ta
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Proto Local Address Foreign Address
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printer 515 Line Printer Daemon (ne
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Connected to 167.195.160.6. Escape
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Workshop Q&A Q What in the blazes i
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3. A 4. B 5. False 6. B 7. True 8.
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Intranet = Internal The word intran
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Internet Identification Previous Ta
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If an outside machine is “on the
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Here I Ping Again Previous Table of
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Figure 19.6 DNS zones, like the fol
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[rs.internic.net] Registrant: John
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For example, I ran an NFS server on
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• SMTP—Simple Mail Transfer Pro
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Dialout DNS Previous Table of Conte
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3. What does DMZ stand for? A. DNS
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• It’s a way to avoid a Dilbert
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Socks Stuff Previous Table of Conte
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Figure 20.2 The AOL Instant Messeng
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RealPlayer Previous Table of Conten
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external client for proxy support,
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Typical Operation Previous Table of
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scantily, and still others are not
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Not every kind of filter is availab
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important. Your relative or interpa
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Application Antics Previous Table o
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Broken Ring Previous Table of Conte
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creating a segment between the swit
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Q Where can I get an Ethernet mini-
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Figure 22.1 The MG-Soft MIB browser
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the probe has picked up what’s go
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Previous Table of Contents Next Her
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information without the overhead th
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A. Broadcast B. Baseline C. Brag D.
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• Application efficiency • Serv
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Application and Protocol Efficiency
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and so on—is to measure. Everythi
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it a point to say, “Would you sho
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Here are the two types of performan
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Network Statistics Previous Table o
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Q About that latency analysis metho
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Router Configuration Previous Table
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For the second option, you’ll hav
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Automatic for the People Previous T
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are in an unknown location) to conn
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Previous Table of Contents Next The
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C. SYS:SYSTEM\AUTOEXEC.BAT D. SYS:P
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active hub An active hub is one tha
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A TCP-based authentication service
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applications and protocols are base
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An extremely fast network cable tha
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See Internet Group Management Proto
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A device that converts (modulates)
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providers. Point-to-Point Tunneling
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security audit An examination (ofte
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An essential part of a network inte
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Index Symbols A 100 Megabit Etherne
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C new product, 45-46 burned-in addr
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DLC (Data Link Control), 17 DMZ (de
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F fat finger factor, 42-43, 46 fata
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ICQ, 335-336 IMAP (Internet Mail Ap
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M filters, 347-352 LANDecoder, 347
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NetBIOS (Network Basic Input/Output
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network card. See NIC Network Contr
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power supply check, 66 troubleshoot
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Q-R qualitative problems, 58 quanti
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names, 393-394 NetWare, 202 paging
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T dumb terminal mode, 211, 224 full
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isolating soft errors, 135-136 LANa
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U standardizing configuration, 245
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V W upstream, 134 Usenet newsgroups
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autodetection problems, 159 broadca
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