small brain dump and more

Here is a little tips

run this command

echo “net.ipv6.conf.all.disable_ipv6=1” > /etc/sysctl.conf ; cat /etc/sysctl.conf ; reboot.

EDIT by ADMIN : DO NOT USE > – it will make empty file. Instead use >> – it will add at the end of file !!

Remember to use “>>” rather than “>” if using peacenell’s command above, to append (rather than overwrite) /etc/sysctl.conf 😉

@peacengell
Dude… that command will empty /etc/sysctl.conf from its previous contents…

@peacengell

just say:

echo “net.ipv6.conf.all.disable_ipv6=1” > /etc/sysctl.conf && sysctl -f /etc/sysctl.conf

need no reboot 😉

Yes, but use two “>” arrows, not one!

echo “net.ipv6.conf.all.disable_ipv6=1″ >> /etc/sysctl.conf
not
echo “net.ipv6.conf.all.disable_ipv6=1″ > /etc/sysctl.conf

all of this is WRONG!!!!!!!!!!!! The correct answer is as follows:
echo “net.ipv6.conf.default.disable_ipv6=1” >> /etc/sysctl.conf
echo “net.ipv6.conf.all.disable_ipv6 = 1” >> /etc/sysctl.conf
then run the following command
sysctl -p
no reboot is required
note the space before and after the =
if you want to test the config on the fly without editing the sysctl.conf file execute the following commands

sysctl -w net.ipv6.conf.default.disable_ipv6=1
sysctl -w net.ipv6.conf.all.disable_ipv6=1

in the command line you do not use any spaces around the =

Good Luck !!

@peacengell
Please delete (or at least fix) this comment before somebody actually empties their sysctl.conf file

thank you
how about
# echo “install ipv6 /bin/true” > /etc/modprobe.d/disable_ipv6.conf

Recommended solution at: https://access.redhat.com/site/solutions/8709

@CDSU
Only one that works. Thank u so much. After 48 hours of mind numbing frustration, i finally have my new dedicated server working! If u are a chick (i realize the chances are quite low, i would soooo take u out to a dinner dinner

@CDSU

[root@Adi openvpn-als]# echo “net.ipv6.conf.default.disable_ipv6=1″ >> /etc/sysctl.conf
[root@Adi openvpn-als]# echo “net.ipv6.conf.all.disable_ipv6 = 1″ >> /etc/sysctl.conf
[root@Adi openvpn-als]# sysctl -p
sysctl: cannot stat /proc/sys/“net/ipv6/conf/default/disable_ipv6: No such file or directory
sysctl: cannot stat /proc/sys/“net/ipv6/conf/all/disable_ipv6: No such file or directory
[root@Adi openvpn-als]#

edit the file ; /etc/sysctl.conf and add :
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.all.disable_ipv6 = 1
and save the fale; restart the network service
#service network restart

Just wondering why you didn’t disable the iptables6 in run level 2 and only in run levels 3,4, and 5.

“disable iptables6 – chkconfig –level 345 ip6tables off”

On my Centos 6.6 this service is on in levels 2, 3, 4, and 5. I am new in Linux and I am trying understand why things are done in a particular way so I don’t end up breaking the system.

Thanks.

Much simpler option:

# sysctl -w net.ipv6.conf.all.disable_ipv6=1
# echo “net.ipv6.conf.all.disable_ipv6 = 1” >>/etc/sysctl.conf

No reboot required, and yes, it will persist when reboot.

Changing the active kernel parameter does not require rebooting the system to take effect.