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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