How to disable IPv6 in Solaris 11 By Devan

How to disable IPv6 in Solaris 11

In contrast to solaris 10, during the Solaris 11 installation, the installer does not ask to disable IPv6. When you assign IP address using ipadm create command, it also create an IPv6 interface. Even if you delete the IPv6 interfaces with “ipadm delete-addr ” and “ifconfig inet6 unplumb“, after rebooting the system you would see the IPv6 interface re-plumbed. The ipadm command persists across reboots but the ifconfig command re-pumbs the IPv6 interface.

The DefaultFixed network profile cannot be changed, so in order to disable IPv6 in solaris 11, we have create a custom profile (ncp) and add NCU’s (network configuration units) as described below. NCPs are made up of individual configuration objects called NCU. Each NCU represents a physical link or an interface that includes the properties that define the configuration for that particular link or interface.

Creating a custom profile

Create a custom profile named noipv6 :

# netcfg
netcfg> create ncp noipv6

Create NCU for the phys

Create the NCU for phys :

netcfg:ncp:noipv6> create ncu phys net0
Created ncu 'net0'.  Walking properties ...
activation-mode (manual) [manual|prioritized]> manual
mac-address>
autopush>
mtu>
netcfg:ncp:noipv6:ncu:net0> list
ncu:net0
 type             link
 class            phys
 parent           "noipv6"
 activation-mode  manual
 enabled          true
netcfg:ncp:noipv6:ncu:net0> end
Committed changes
netcfg:ncp:noipv6> list
ncp:noipv6
 management-type  reactive
NCUs:
 phys net0

Create NCU for the IP

Create the NCU for IP :

netcfg:ncp:noipv6> create ncu ip net0
Created ncu 'net0'.  Walking properties ...
ip-version (ipv4,ipv6) [ipv4|ipv6]> ipv4
ipv4-addrsrc [dhcp|static]> static
ipv4-addr> 192.168.1.20
ipv4-default-route>
netcfg:ncp:noipv6:ncu:net0> list
ncu:net0
 type             interface
 class            ip
 parent           "noipv6"
 enabled          true
 ip-version       ipv4
 ipv4-addrsrc     static
 ipv4-addr        "192.168.1.20"
netcfg:ncp:noipv6:ncu:net0> end
Committed changes
netcfg:ncp:noipv6> end
netcfg> end

Enable the profile created

Enable the newly created profile :

# netadm enable -p ncp noipv6
Enabling ncp 'noipv6'

Verify

Check the IP address to verify that the IPv6 interface does not exist anymore.

# ifconfig -a
lo0: flags=2001000849[UP,LOOPBACK,RUNNING,MULTICAST,IPv4,VIRTUAL] mtu 8232 index 1
 inet 127.0.0.1 netmask ff000000
net0: flags=1000843[UP,BROADCAST,RUNNING,MULTICAST,IPv4] mtu 1500 index 3
 inet 192.168.1.20 netmask ffffff00 broadcast 192.168.1.255
 ether 0:c:29:12:40:6f
lo0: flags=2002000849[UP,LOOPBACK,RUNNING,MULTICAST,IPv6,VIRTUAL] mtu 8252 index 1
 inet6 ::1/128

In case you want to plumb another interface, add the phys and IP to the same profile we just created in a similar fasion shown above. To select the profile noipv6 use the command :

# necfg
netcfg> select ncp noipv6