How to disable IPv6 protocol in kickstart installation?

Environment

• Red Hat Enterprise Linux 9
• Red Hat Enterprise Linux 8
• Red Hat Enterprise Linux 7
• Red Hat Enterprise Linux 6
• kickstart

Issue

• How to disable IPv6 protocol in kickstart installation.?

Resolution

To disable IPv6 protocol in kickstart installation, following two settings must be set.

• Set "--noipv6" in ks.cfg file:

network --onboot yes --device eth0 --bootproto dhcp --noipv6       

Above setting will add "IPV6INIT=no" in /etc/sysconfig/network-scripts/ifcfg-eth0.

To disable IPv6 during the installation

Red Hat Enterprise Linux 6

• Pass "noipv6" parameter to the kernel. This setting will create /etc/modprobe.d/ipv6.conf file and set "options ipv6 disable=1" in it.

kernel vmlinuz
append ks=http://192.168.122.xxx/ks.cfg noipv6 initrd=initrd.img

Red Hat Enterprise Linux 7

• Pass "ipv6.disable=1" parameter to the kernel.

vmlinuz initrd=initrd.img inst.stage2=hd:LABEL=RHEL-7.3\x20Server.x86_64 ks=http://192.168.122.xxx/ks.cfg ipv6.disable=1

Red Hat Enterprise Linux 8

• Pass "ipv6.disable=1" parameter to the kernel.

vmlinuz initrd=initrd.img inst.stage2=hd:LABEL=RHEL-8-4-0-BaseOS-x86_64 ks=http://192.168.122.xxx/ks.cfg ipv6.disable=1

Red Hat Enterprise Linux 9

• Pass "ipv6.disable=1" parameter to the kernel.

vmlinuz initrd=initrd.img inst.stage2=hd:LABEL=RHEL-9-1-0-BaseOS-x86_64 ks=http://192.168.122.xxx/ks.cfg ipv6.disable=1

Please note that both the above settings are necessary, otherwise IPv6 protocol won't be disabled after the installation.

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