Ubuntu Isc-Dhcp 4.2.4 and disable IPv6 !

[CpServiceSPb .]

Hi again.
Adding of GRUB_CMDLINE_LINUX_DEFAULT="ipv6.disable=1"
to /etc/default/grub allowed to avoid listening of ipv6 port by dhcpd.

Thanks.

With wishes of many good things.

2016-03-17 17:38 GMT+03:00 CpServiceSPb . <cpservicespb at gmail.com>:

> Hi.
> Output of netstat command made me think.
> Let' s look:
>
> tcp        0      0 127.0.0.1:5038          0.0.0.0:*
> LISTEN      27158/asterisk
> tcp        0      0 0.0.0.0:80              0.0.0.0:*
> LISTEN      911/apache2
> tcp        0      0 10.10.0.254:82          0.0.0.0:*
> LISTEN      911/apache2
> tcp        0      0 127.0.0.1:82            0.0.0.0:*
> LISTEN      911/apache2
> tcp        0      0 10.10.0.254:53          0.0.0.0:*
> LISTEN      2167/named
> tcp        0      0 127.0.0.1:53            0.0.0.0:*
> LISTEN      2167/named
> tcp        0      0 10.10.0.254:5432        0.0.0.0:*
> LISTEN      1635/postgres
> tcp        0      0 127.0.0.1:5432          0.0.0.0:*
> LISTEN      1635/postgres
> tcp        0      0 127.0.0.1:953           0.0.0.0:*
> LISTEN      2167/named
> tcp        0      0 127.0.0.1:5432          127.0.0.1:59125
> ESTABLISHED 27198/postgres: ast
> tcp        0      0 127.0.0.1:59125         127.0.0.1:5432
> ESTABLISHED 27158/asterisk
> udp        0      0 0.0.0.0:5060            0.0.0.0:*
> 27158/asterisk
> udp        0      0 127.0.0.1:41958         127.0.0.1:41958
> ESTABLISHED 1635/postgres
> *udp        0      0 0.0.0.0:40895 <http://0.0.0.0:40895>
> 0.0.0.0:*                           12116/dhcpd*
> udp        0      0 10.10.0.254:53          0.0.0.0:*
> 2167/named
> udp        0      0 127.0.0.1:53            0.0.0.0:*
> 2167/named
> *udp        0      0 0.0.0.0:67 <http://0.0.0.0:67>
> 0.0.0.0:*                           12116/dhcpd*
> udp   125440      0 0.0.0.0:68              0.0.0.0:*
> 10681/charon
> udp        0      0 10.10.0.254:123         0.0.0.0:*
> 1290/ntpd
> udp        0      0 127.0.0.1:123           0.0.0.0:*
> 1290/ntpd
>
> *udp6       0      0 :::39873
> :::*                                12116/dhcpd*
>
>
> I will try to change grubconf.
> But I turned off IPv6 completely by sysctl.d.
>
> With wishes of many good things.
>
> 2016-03-17 15:39 GMT+03:00 Nicolas C. <dhcp at nryc.fr>:
>
>> Le 16/03/2016 23:05, CpServiceSPb . a écrit :
>>
>>> I have isc-dhcp-server installed at ubuntu 14.04 x64.
>>> Its version is 4.2.4
>>> I have fully disabled IPv6 at OS.
>>> Also I have "-4" option for dhcp server startup.
>>> But there is one IPv6 listened address by netstat -anupt.
>>> Port is dyynamic.
>>> What is this dynamically defined port intended for ?
>>> And how is to fully disable IPv6 listening ?
>>>
>>
>> Hello,
>>
>> What makes you think that this is caused by the DHCP server? Can you give
>> us the output of your "netstat" command? Is the dhcpd service listening to
>> an IPv6 address? Maybe a "ps -ef | grep dhcpd" will give us a hint.
>>
>> Try disabling IPv6 by adding "ipv6.disable=1" on the
>> GRUB_CMDLINE_LINUX_DEFAULT variable in the /etc/default/grub file, then run
>> "update-grub" and reboot. But there's little chance that the DHCP server
>> has anything to do with your problem because it is not dual-stack : it can
>> operate only for one protocol at the time (DHCPv4 *or* DHCPv6).
>>
>> Have a nice day,
>>
>
>
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