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ulthwe13

Member

Registered: 2023-05-05

Posts: 1

How to Disable IPv6 and persist after reboot

I've been trying to disable Ipv6 as per the instructions on the wiki using sysctl I've set the following in /etc/sysctl,d/99-sysctl.conf

net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.enp4s0.disable_ipv6 = 1

After rebooting I still have an ipv6 address.

output of ip addr

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: enp4s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether f0:2f:74:b2:74:8a brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.25/24 brd 192.168.0.255 scope global dynamic noprefixroute enp4s0
       valid_lft 84689sec preferred_lft 84689sec
    inet6 fd13:ed41:aeff:0:4ab9:1ee6:bc67:83a1/64 scope global noprefixroute
       valid_lft forever preferred_lft forever
    inet6 2a02:c7e:3300:7a00:afd9:8812:7aee:66a4/64 scope global dynamic noprefixroute
       valid_lft 2609sec preferred_lft 2609sec
    inet6 fe80::cc53:57de:c32a:748d/64 scope link noprefixroute
       valid_lft forever preferred_lft forever

seth

Member

From: Won't reply 2 private help req

Registered: 2012-09-03

Posts: 76,337

Re: How to Disable IPv6 and persist after reboot

/etc/sysctl,d/99-sysctl.conf

sysctl net.ipv6.conf 2>/dev/null | grep disable

Adding ipv6.disable=1 to the kernel line disables the whole IPv6 stack, which is likely what you want if you are experiencing issues

Last edited by seth (2023-05-05 08:15:02)

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