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Marcos
Asked: 2014-09-16 04:11:59 +0800 CST

Both named and dnsmasq serving DNS on port 53?

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Is this considered normal for Ubuntu 14.04 ?

netstat -tulpn shows that both bind9 (named) and dnsmasq serve on port 53:

 Active Internet connections (only servers) Proto Recv-Q Send-Q Local
 Address           Foreign Address         State       PID/Program name
 tcp        0      0 127.0.0.1:53            0.0.0.0:*               LISTEN      4041/named 
 tcp        0      0 127.0.1.1:53            0.0.0.0:*               LISTEN      3653/dnsmasq

Also with UDP:

udp        0      0 127.0.0.1:53            0.0.0.0:*    4041/named
udp        0      0 127.0.1.1:53            0.0.0.0:*    3653/dnsmasq

Notice that only dnsmasq listens outside localhost, over port 67:

udp        0      0 0.0.0.0:67              0.0.0.0:*                           2158/dnsmasq

Other functions this server performs are primary DNS zones for a dev team's private domain, routing, NAT and transparent proxy(squid3 & iptables) with DHCP server.

networking

1 Answers

  1. They are bound at different addresses. named is listening on 127.0.0.1 while dnsmasq is listening on 127.0.1.1. They probably resolve to different virtual network devices

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