How to Control the Display Output of IP-Related Commands

You can control the output of the netstat and ifconfig commands 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 -4 and -6 flags in the ifconfig command override the values set in the inet_type file. The -f flag in the netstat command also overrides the values set in the inet_type file.

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Example 7–14 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:

  % ifconfig -a lo0: flags=1000849 mtu 8232 index 1 inet 10.10.0.1 netmask ff000000 qfe0: flags=1000843 mtu 1500 index 2 inet 10.46.86.54 netmask ffffff00 broadcast 10.46.86.255 ether 8:0:20:56:a8 lo0: flags=2000849 mtu 8252 index 1 inet6 ::1/128 qfe0: flags=2000841 mtu 1500 index 2 ether 8:0:20:56:a8 inet6 fe80::a00:fe73:56a8/10 qfe0:1: flags=2080841 mtu 1500 index 2 inet6 2001:db8:3c4d:5:a00:fe73:56a8/64

• When you specify the DEFAULT_IP=IP_VERSION4 or DEFAULT_IP=IP_VERSION6 variable in the inet_type file, you should have the following output:

  % ifconfig -a lo0: flags=849 mtu 8232 inet 10.10.0.1 netmask ff000000 qfe0: flags=843 mtu 1500 inet 10.46.86.54 netmask ffffff00 broadcast 10.46.86.255 ether 8:0:20:56:a8