F19: ipv6disable=1 as boot-param ignored

Reindl Harald h.reindl at thelounge.net
Mon Jul 8 14:15:06 UTC 2013



Am 08.07.2013 15:56, schrieb Cristian Sava:
> On Sun, 2013-07-07 at 18:18 +0200, Reindl Harald wrote:
>> "ipv6disable=1" in F19 is ignored
>>
>> i get tired every few months research how IPv6 to disable
>> because it permanently changes, maybe it is F19/systemd
>> maybe it is the F20 3.10.0-1.fc20.x86_64 because it is
>> the only 3.10 build currently, however the kernel-line
>> is clear
>>
>> on pure ipv4 networks there is no need for
>> "inet6 fe80::20c:29ff:fe30:82b9" period
>>
>> eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
>>         inet 192.168.196.18  netmask 255.255.255.0  broadcast 192.168.196.255
>>         inet6 fe80::20c:29ff:fe30:82b9  prefixlen 64  scopeid 0x20<link>
>>         ether 00:0c:29:30:82:b9  txqueuelen 1000  (Ethernet)
>>         RX packets 755  bytes 71786 (70.1 KiB)
>>         RX errors 0  dropped 0  overruns 0  frame 0
>>         TX packets 594  bytes 162204 (158.4 KiB)
>>         TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>>
> Do you mind to disable IPV6 in ifcfg-eth0 (comment out IPV6_...)? You
> will probably lose your default (ipv4) route!
> You're not alone.

this has notthing to do with ifcfg-files
there is "IPV6INIT=no" since many years on my machines

"ipv6disable=1" is for disable the *entire* ipv6 stack
and a good admin disableds *anything* which is not
in use for security reasons - i have ip4-rules on servers
which are even block 127.0.0.1 for Samba while it is
allowed from specific LAN IP's but not from php-scripts
__________________

syslog message at boot:
ipv6: Loaded, but administratively disabled, reboot required to enable

this does currently no longer work and every release
the magic how to achive this is randomly changed
from sysctl to kernel-params, different params or
modprobe-aliases a few years before



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