Administering and Logging Network Status Displays

The following tasks show how to check the status of the network by using well-known networking commands.

How to Control the Display Output of IP-Related Commands

You can control the output of the netstat command to display IPv4 information only, or both IPv4 and IPv6 information.

1. Create the /etc/default/inet_type file.
2. Add one of the following entries to /etc/default/inet_type, as required for your network:

   • To display IPv4 information only:

     DEFAULT_IP=IP_VERSION4

   • To display both IPv4 and IPv6 information:

     DEFAULT_IP=BOTH

     Or

     DEFAULT_IP=IP_VERSION6

     For more information about the inet_type file, see the inet_type(4) man page.

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   Note - The -f flag in the netstat command overrides the values set in the inet_type file.

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Example 5-10 Controlling Output to Select IPv4 and IPv6 Information

• When you specify the DEFAULT_IP=BOTH or DEFAULT_IP=IP_VERSION6 variable in the inet_type file, you should have the following output:

  % ipadm show-addr
  ADDROBJ      TYPE       STATE   ADDR
  lo0/v4       static     ok      127.0.0.1/8
  net0/v4      static     ok      10.46.86.54/24
  lo0/v6       static     ok      ::1/128
  net0/v6      addrconf   ok      fe80::a00:fe73:56a8/10 
  net0/v6add   static     ok      2001:db8:3c4d:5:a00:fe73:56a8/64

• When you specify the DEFAULT_IP=IP_VERSION4 variable in the inet_type file, you should have the following output:

  % ipadm show-addr
  ADDROBJ      TYPE       STATE   ADDR
  lo0/v4       static     ok      127.0.0.1/8
  net0/v4      static     ok      10.46.86.54/24

How to Log Actions of the IPv4 Routing Daemon

If you suspect a malfunction of routed, the IPv4 routing daemon, you can start a log that traces the daemon's activity. The log includes all packet transfers when you start the routed daemon.

• Create a log file of routing daemon actions:

  # /usr/sbin/in.routed /var/log-file-name

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  Caution - On a busy network, this command can generate almost continuous output.

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Example 5-11 Network Log for the in.routed Daemon

The following example shows the beginning of the log that is created by the procedure How to Log Actions of the IPv4 Routing Daemon.

-- 2003/11/18 16:47:00.000000 --
Tracing actions started
RCVBUF=61440
Add interface lo0  #1   127.0.0.1      -->127.0.0.1/32   
   <UP|LOOPBACK|RUNNING|MULTICAST|IPv4> <PASSIVE> 
Add interface net0 #2   10.10.48.112    -->10.10.48.0/25   
    <UP|BROADCAST|RUNNING|MULTICAST|IPv4> 
turn on RIP
Add    10.0.0.0        -->10.10.48.112      metric=0  net0  <NET_SYN>
Add    10.10.48.85/25  -->10.10.48.112      metric=0  net0  <IF|NOPROP>

How to Trace the Activities of the IPv6 Neighbor Discovery Daemon

If you suspect a malfunction of the IPv6 in.ndpd daemon, you can start a log that traces the daemon's activity. This trace is displayed on the standard output until terminated. This trace includes all packet transfers when you start the in.ndpd daemon.

1. Start a trace of the in.ndpd daemon.

   # /usr/lib/inet/in.ndpd -t

2. Terminate the trace as needed by typing Control-C.

Example 5-12 Trace of the in.ndpd Daemon

The following output shows the beginning of a trace of in.ndpd.

# /usr/lib/inet/in.ndpd -t
Nov 18 17:27:28 Sending solicitation to  ff02::2 (16 bytes) on net0
Nov 18 17:27:28         Source LLA: len 6 <08:00:20:b9:4c:54>
Nov 18 17:27:28 Received valid advert from fe80::a00:20ff:fee9:2d27 (88 bytes) on net0
Nov 18 17:27:28         Max hop limit: 0
Nov 18 17:27:28         Managed address configuration: Not set
Nov 18 17:27:28         Other configuration flag: Not set
Nov 18 17:27:28         Router lifetime: 1800
Nov 18 17:27:28         Reachable timer: 0
Nov 18 17:27:28         Reachable retrans timer: 0
Nov 18 17:27:28         Source LLA: len 6 <08:00:20:e9:2d:27>
Nov 18 17:27:28         Prefix: 2001:08db:3c4d:1::/64
Nov 18 17:27:28                 On link flag:Set
Nov 18 17:27:28                 Auto addrconf flag:Set
Nov 18 17:27:28                 Valid time: 2592000
Nov 18 17:27:28                 Preferred time: 604800
Nov 18 17:27:28         Prefix: 2002:0a00:3010:2::/64
Nov 18 17:27:28                 On link flag:Set
Nov 18 17:27:28                 Auto addrconf flag:Set
Nov 18 17:27:28                 Valid time: 2592000
Nov 18 17:27:28                 Preferred time: 604800