Ubuntu Isc-Dhcp 4.2.4 and disable IPv6 !

CpServiceSPb . cpservicespb at gmail.com
Thu Mar 17 14:38:53 UTC 2016


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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