Question

40

How to disable IPv6 on Ubuntu?

rated 0 times [ 40] [ 0] / answers: 1 / hits: 112061 / 3 Years ago, tue, july 6, 2021, 7:18:30

I disabled IPv6 on an Ubuntu box which has ssh and rsync running. But both of these are still listening on an IPv6 address. How should I fix this?

[email protected]:~# sysctl net.ipv6.conf.all.disable_ipv6

net.ipv6.conf.all.disable_ipv6 = 1

[email protected]:~# sysctl net.ipv6.conf.default.disable_ipv6

net.ipv6.conf.default.disable_ipv6 = 1

[email protected]:~# sysctl net.ipv6.conf.lo.disable_ipv6

net.ipv6.conf.lo.disable_ipv6 = 1

And

[email protected]:~# ss -lnp6

State      Recv-Q Send-Q        Local Address:Port    Peer Address:Port

LISTEN     0      128            :::22                 :::*      users:(("sshd",1505,4))

LISTEN     0      5              :::873                :::*      users:(("rsync",3423,5))

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guialk

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3 Years ago

answered 3 Years ago huovie · Accepted Answer

This worked for me:

Add these lines to the bottom of sysctl.conf

net.ipv6.conf.all.disable_ipv6 = 1

net.ipv6.conf.default.disable_ipv6 = 1

net.ipv6.conf.lo.disable_ipv6 = 1

Then run sudo sysctl -p or reboot

source: http://www.noobslab.com/2012/05/disable-ipv6-if-your-internet-is.html

This of course won't stop bind from blindly trying to use ipv6 though, so you also need to alter /etc/default/bind9 like so:

# run resolvconf? 

RESOLVCONF=yes 

# startup options for the server 

OPTIONS="-4 -u bind"

source: http://blog.evilcoder.net/disable-ipv6-on-bind9-linux/#sthash.U95y4s6U.dpuf