I want to set up bind9, but something is listening on port 53. It's local address is ubuntu.ubuntu-do:domain. How to disable it, so it wouldn't listen anymore? I think it is dnsmasq, but still I don't know hot to disable it.
1 Answer
Port 53 is reserved for the Domain Name System (DNS).
In your case it is the DNS cacher dnsmasq of the package dnsmasq-base. This pre-installed package is a dependency of network-manager, the network manager of your desktop environment (e.g. Unity, GNOME, …).
For this reason, don't uninstall the package dnsmasq-base and/or disable the service. Install bind9 and all is fine
sudo apt-get install bind9Now you should see something like this, bind9 (named) is also running on port 53:
% sudo netstat -tulpn | grep ":53 "
tcp 0 0 192.168.2.131:53 0.0.0.0:* LISTEN 8921/named
tcp 0 0 127.0.0.1:53 0.0.0.0:* LISTEN 8921/named
tcp 0 0 127.0.1.1:53 0.0.0.0:* LISTEN 1223/dnsmasq
tcp6 0 0 :::53 :::* LISTEN 8921/named
udp 0 0 192.168.2.131:53 0.0.0.0:* 8921/named
udp 0 0 127.0.0.1:53 0.0.0.0:* 8921/named
udp 0 0 127.0.1.1:53 0.0.0.0:* 1223/dnsmasq
udp6 0 0 :::53 :::* 8921/named Use the command
sudo netstat -tulpnto show the ports and listening processes for udp and tcp. For DNS it's usually UDP.
Use
ps -p PID -o comm=to show the command name for the given process id (PID).
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