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Your Web Server My favorite Web server troubleshooting technique (which I mentioned briefly in Hour 18) is to telnet to socket 80 of a Web server and see whether I can use the GET HTTP command. (Most times, this will make the server shoot the main index page my way.) If I can, that means the server is responding to HTTP requests, and users should have no trouble accessing the server to get HTML pages. This is a good indication that the network between you and the Web server is okay. Most Web server problems fall into three categories: • Reliability problems • Third-server problems • Network problems We won’t discuss network problems here—they’re addressable using the techniques we discussed in the “Cyber Chaos” section, earlier, as well as in Hour 17, “Where Do I Start?” and Hour 18. Reliability Problems Reliability problems fall into two subcategories: • Capacity problems (server overload) • Crash problems (server dies with a blue screen, kernel panic, and so on) If your server is truly so popular as to be overloaded (really unlikely unless you provide an incredibly popular service on the Internet), you’ll first want to check your server log files. Are the hits that you’re getting “official” hits? Or has one of your users posted a non–work-related (but very popular) Web page? Overload is really unlikely on an non–Internet-connected server. Most Web servers can handle hundreds, if not thousands, of users without a problem. It’s when you start to get hundreds of hits per second that you really have a problem. If you really want to be that popular, you’ll have to collect your log files and involve your server vendor and ISP, and you’ll probably have to upgrade two things: your Web server and your Internet connection. Based on the amount of Web data shown to be transferred in your logs, these two vendors will make recommendations about how you can upgrade. It’s more likely, particularly for a non–Internet-connected intranet server, that your problems will be crash related. Take heart—most reliability problems are revision related or related to other software on the server. Make sure to get the latest version and/or patches for whatever Web server you use, as well as to use divide-and-conquer and rule-out methods on other services that run on the server.
For example, I ran an NFS server on one NT server in conjunction with a Web server. The server kept dying with the blue screen of death on a regular basis—that is, until I removed the NFS server from it and replaced it with an NFS server from a different vendor. Previous Table of Contents Next
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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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Previous Table of Contents Next
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This is called looping back, becaus
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Windows Previous Table of Contents
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Figure 8.4 The NT Task Manager’s
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UNIX Previous Table of Contents Nex
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Probably the most important thing t
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Hour 9 Ethernet Basics Previous Tab
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which translates into lots of colli
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it currently requires fiber-optic c
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designation is simply an industry-s
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Down, Down, Down Previous Table of
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A Collisions cause other errors, su
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Follow the Rules: Share and Enjoy!
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Previous Table of Contents Next Err
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Token Analyzers Finding a NAUN is r
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Token-Ring does not have any hard-a
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Down Town Previous Table of Content
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C. 1, 16 D. 4, 16 Answers to Quiz Q
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Going Native Although Windows allow
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Eminent Domain Previous Table of Co
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machine with the username Administr
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protocol. They therefore relied on
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Previous Table of Contents Next Fol
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Most of the time, you’ll not want
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allows you to manage them and check
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Binding Previous Table of Contents
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Figure 11.6 Showing bindings for al
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Informational Commands Previous Tab
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Figure 11.8 A monitor session. We k
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case you need them. 2. What does SM
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a great example of client/server. W
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Previous Table of Contents Next Alt
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The first number is the process ID
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tcp 0 0 frotz.frob.com.telnet 200.1
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Name Game Previous Table of Content
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The next thing you need to find out
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A UNIX security and file permission
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the amount of time used or data sen
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NLMs In addition to accepting comma
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NLM Party Previous Table of Content
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Again, make sure you are running th
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Big Monitor Is Watching Previous Ta
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Then, eureka! During one session of
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Protocol Problems Previous Table of
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Figure 13.10 UNICON will configure
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Summary Previous Table of Contents
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7. The TCP/IP protocol and basic se
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ivory-tower stuff, but some of it i
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Configuring in Comfort Previous Tab
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Router 1 in Figure 14.3 is shown in
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to that network. Instead, the next
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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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Page 251 and 252: in this hour—will pay off as you
Page 253 and 254: Q Which duplication software is rig
Page 255 and 256: Hour 17 Where Do I Start? Previous
Page 257 and 258: As optimistic as we’d all like to
Page 259 and 260: • PCAnywhere • ReachOut • Rem
Page 261 and 262: IPX/SPX Previous Table of Contents
Page 263 and 264: Q What happens if I ping the loopba
Page 265 and 266: correlations? A. netstat -a B. trac
Page 267 and 268: equire that the application files t
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Page 271 and 272: With five potential points of failu
Page 273 and 274: In some cases, a slight difference
Page 275 and 276: Application Celebration Previous Ta
Page 277 and 278: Proto Local Address Foreign Address
Page 279 and 280: printer 515 Line Printer Daemon (ne
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Page 283 and 284: Connected to 167.195.160.6. Escape
Page 285 and 286: Workshop Q&A Q What in the blazes i
Page 287 and 288: 3. A 4. B 5. False 6. B 7. True 8.
Page 289 and 290: Intranet = Internal The word intran
Page 291 and 292: Internet Identification Previous Ta
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Page 297 and 298: Figure 19.6 DNS zones, like the fol
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Page 303 and 304: • SMTP—Simple Mail Transfer Pro
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Page 307 and 308: 3. What does DMZ stand for? A. DNS
Page 309 and 310: • It’s a way to avoid a Dilbert
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Page 313 and 314: Figure 20.2 The AOL Instant Messeng
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Page 323 and 324: scantily, and still others are not
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Page 329 and 330: Application Antics Previous Table o
Page 331 and 332: Broken Ring Previous Table of Conte
Page 333 and 334: creating a segment between the swit
Page 335 and 336: Q Where can I get an Ethernet mini-
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Page 339 and 340: Figure 22.1 The MG-Soft MIB browser
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Page 345 and 346: information without the overhead th
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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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