AIX 5L Problem Determination - IBM Redbooks

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3. If there is a default route, attempt to ping it. # ping 9.3.240.1 PING 9.3.240.1: (9.3.240.1): 56 data bytes 64 bytes from 9.3.240.1: icmp_seq=0 ttl=64 time=1 ms 64 bytes from 9.3.240.1: icmp_seq=1 ttl=64 time=0 ms ^C ----9.3.240.1 PING Statistics---- 2 packets transmitted, 2 packets received, 0% packet loss round-trip min/avg/max = 0/0/1 ms The ping -c command will limit the number of pings to the value specified after the -c flag. # ping -c 1 server2 PING server2.itsc.austin.ibm.com: (9.3.240.57): 56 data bytes 64 bytes from 9.3.240.57: icmp_seq=0 ttl=255 time=0 ms ----server2.itsc.austin.ibm.com PING Statistics---- 1 packets transmitted, 1 packets received, 0% packet loss round-trip min/avg/max = 0/0/0 ms # export NSORDER=local,bind,nis # ping -c 1 server2 PING server2: (9.3.240.57): 56 data bytes 64 bytes from 9.3.240.57: icmp_seq=0 ttl=255 time=0 ms ----server2 PING Statistics---- 1 packets transmitted, 1 packets received, 0% packet loss round-trip min/avg/max = 0/0/0 ms 4. If you have more than one network interface, attempt to determine if any interfaces are working. If you cannot ping your default route, either the default gateway is down, or your local network connection may be down. Attempt to ping all of the gateways listed in the routing table to see if any portion of your network is functioning. If you cannot ping any host or router interface from among those listed in the routing table, try to ping your loopback interface lo0 with the following command: # ping localhost PING localhost: (127.0.0.1): 56 data bytes 64 bytes from 127.0.0.1: icmp_seq=0 ttl=255 time=1 ms ^C ----localhost PING Statistics---- 1 packets transmitted, 1 packets received, 0% packet loss round-trip min/avg/max = 1/1/1 ms If the ping is successful, you have an adapter or network hardware problem or a routing problem. The ping -f (flood ping) command outputs packets as fast as they come back or one hundred times per second, whichever is more. The 182 IBM ^ Certification Study Guide - AIX 5L Problem Determination Tools and Techniques
command ping -f (flood ping) requires root access to the system. For every ECHO_REQUEST sent, a period '.' is printed, while for every ECHO_REPLY received, a backspace is printed. This provides a rapid display of how many packets are being dropped. If the ping is not successful, you need to: 1. Ensure that the inetd process is actively using the lssrc -g tcpip command. If inetd is not active, issue the startsrc -s inetd or startsrc -g tcpip command. # lssrc -g tcpip Subsystem Group PID Status routed tcpip 5424 active inetd tcpip 6192 active snmpd tcpip 6450 active gated tcpip inoperative named tcpip inoperative ----- the output was edited for brevity ----- 2. Check the state of the loopback interface (lo0) with the netstat -i command. If you see lo0* in the output, check the /etc/hosts file for an uncommented local loopback entry, as follows: # netstat -I lo0 -n Name Mtu Network Address Ipkts Ierrs Opkts Oerrs Coll lo0* 16896 link#1 412934 0 414344 0 0 lo0* 16896 127 127.0.0.1 412934 0 414344 0 0 lo0* 16896 ::1 412934 0 414344 0 0 # grep localhost /etc/hosts 127.0.0.1 loopback localhost # loopback (lo0) name/address A splat (*) after the interface name in the output from the netstat command indicates that the interface is down. Use the following command to start the lo0 interface: # ifconfig lo0 inet 127.0.0.1 up If you cannot reach a host that is in a different network, you can check the connection using the traceroute command. The traceroute command output shows each gateway that the packet traverses on its way to finding the target host. If possible, examine the routing tables of the last machine shown in the traceroute output to check if a route exists to the destination from that host. The last machine shown is where the routing is incorrectly set. # traceroute 9.3.240.56 traceroute to 9.3.240.56 (9.3.240.56), 30 hops max, 40 byte packets 1 server4e (10.47.1.1) 1 ms 1 ms 0 ms 2 server1 (9.3.240.56) 1 ms 1 ms 1 ms Chapter 8. Network problem determination 183
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ibm.com/redbooks IBM Certification
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Note: Before using this information
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3.5.1 The /etc/inittab file . . . .
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7.2.1 Data relocation . . . . . . .
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9.9.1 The lslicense command . . . .
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x IBM ^ Certification Study Guide -
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10-12 Performance tuning flowchart
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8-7 Commonly used flags of the rout
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Trademarks The following terms are
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This publication does not replace p
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Comments welcome Your comments are
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1.1 Certification requirements To a
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e. Verify that file systems are mou
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Preparation for this exam is the to
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2.1 Defining the problem The first
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If the problem occurs on more than
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2.4.1 Answers The following are the
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3.1 A general overview of the boot
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mainly to components on the motherb
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Figure 3-3 Task selection menu in d
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3.2.2 PCI systems next step is to s
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3.3 Boot phase 1 Newer PCI architec
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3.4 Boot phase 2 In boot phase 2, t
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As mentioned, there are a lot of di
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3.4.3 LED 518 product documentation
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Figure 3-9 Boot phase 3 /etc/initta
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3.5.2 LED 553 3.5.3 LED c31 3.5.4 L
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3.5.5 pSeries servers A specific LE
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When the system is gracefully shut
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LED Reason/action c31 Define the co
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3. A file system is being mounted b
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3.9.1 Answers 3.10 Exercises The fo
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4.1 Hardware basics RS/6000 and pSe
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The most important fields in the pr
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Figure 4-1 Main diagnostics menu Th
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► Full testing requires that the
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3. Place the CD-ROM into the drive.
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Note: This service aid is only pres
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2. Select Change Show use of an SSA
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LED 299 A LED code of 299 shows tha
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Figure 4-2 Format of the 103 code m
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4.5 Quiz The following assessment q
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4.5.1 Answers 4.6 Exercises The fol
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5.1 Configuring the dump device Pri
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5.2 Starting a system dump A user-i
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A command status screen will be dis
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If the system does not have a key s
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The shconf command is invoked when
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5.4 Increasing the size of the dump
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Setting output device to /dev/rmt0.
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Look at the time of the dump and th
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Failure Causes SOFTWARE PROGRAM Rec
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Using crash, you can examine: ► A
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► ? or help[] Lists all subcomman
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LR: .waitproc+d4 (0000edc4) 2ff3b38
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DSIRR Data Storage Interrupt Reason
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*prevthread:0xe6000000 *nextthread:
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In this example, the VMM return cod
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The snap command syntax is as follo
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Flag Description -t Format Lists ea
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Flag Description -p Device Temporar
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Figure 5-3 Error log case study 2.
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Figure 5-4 Case study Which of the
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5.10.1 Answers 5.11 Exercises The f
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6.1 The error daemon The error logg
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To change the current log file, the
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To process a report from the error
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Flag Description -g Displays the AS
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Flag Description -F FlagList Select
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Probable Causes ERRDEMON STARTED AU
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To display a detailed report of all
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USER ID 0 0=SOFT IPL 1=HALT 2=TIME
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Resource Class: planar Resource Typ
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Flag Description -k ErrorID[,ErrorI
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6.5.1 Setting up an accounting syst
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6.6 The syslogd daemon The syslogd
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232 IBM ^ Certification Study Guide
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Figure 10-1 General performance tun
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Display previously captured data Th
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10.1.2 The vmstat command The vmsta
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later). The method used in AIX Vers
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second. Large values indicate a CPU
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kernel routine records the process
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syncd 1 2 2 0 0 0 sh 1 1 1 0 0 0 sl
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The memory columns The memory colum
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The sr column The sr column shows t
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If you want to sort to the sixth co
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► Workload Management Class (-W)
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schedtune limitations The schedtune
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schedtune parameters are reset by t
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Normal files are automatically mapp
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tty: tin tout avg-cpu: % user % sys
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When looking for performance proble
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those that do not. If you are runni
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The netstat -m command The netstat
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spec buf 1 0 0 0 128 128 0 locking
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Late Collision Errors The Late Coll
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The retrans column displays the num
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Figure 10-3 Web-based System Manage
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Superclasses A superclass is a clas
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► Shared subclass: This subclass
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The sequence of attributes within a
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This manual assignment can be done
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This defines three levels of privil
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The class assignment is done by WLM
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Figure 10-8 shows the SMIT panel wh
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Figure 10-10 SMIT panel for rset re
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10.6.1 The dbx command The dbx comm
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Subcommand Description return Conti
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15) phxent_dd [5 entries] 16) kbddd
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10.8 Command summary The following
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10.8.4 The nfsstat command 10.9 Qui
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6. Which command will show system c
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11.1 Overview 11.1.1 Terminology 11
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Note: Before installing a new set o
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► APAR number, such as IY00301. I
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► To install all filesets associa
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Table 11-2 Commonly used flags of t
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11.5 Quiz Flag Description -f Check
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- A Web server The browser must be
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Figure 12-2 HTTP filesets If you ar
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- Remote computer Type the remote d
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Figure 12-4 Documentation Library S
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CISPR International Special Committ
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I/O Input/Output I 2 C Inter Integr
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OEM Original Equipment Manufacturer
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SPM System Performance Measurement
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Other resources These publications
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phase1 figure 23 phase2 15, 24, 36
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pc.statd 189 daemons shdaemon 73 te
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host name resolution telnet login p
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N name resolution diagnostic 185 pr
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ecent CPU usage 241 recovering an i
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System Resource Controller (SRC) 13
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IBM Certification Study Guide - AIX
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