Default Open Ports in Cumulus Linux

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The following ports are opened when a switch running Cumulus Linux 3.2 or later boots up:

Internet Protocol

Port

Protocol

TCP

22

Secure Shell (ssh)

TCP

53

DNS forwarder and DHCP server (dnsmasq)

(RMP only)

TCP6

22

Secure Shell (ssh)

TCP6

53

DNS forwarder and DHCP server (dnsmasq)

(RMP Only)

UDP

53    

DNS forwarder and DHCP server (dnsmasq)

(RMP Only)

UDP

68*

DHCP client (dhclient)

UDP

123

Network Time Protocol (ntp)

UDP

3784/3785/4784

Prescriptive Topology Manager (ptm)

UDP6

53     

DNS forwarder and DHCP server (dnsmasq)

(RMP Only)

UDP6

123

Network Time Protocol (ntp)

UDP6

3784/4784

Prescriptive Topology Manager (ptm)

UDP6

*

DHCP client (dhclient)

*Has a dynamically assigned port.

The ports can be seen with the following command:

cumulus@switch:~$ sudo netstat -nlp --inet --inet6

Active Internet Connections (only servers)

Protocol Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:53 0.0.0.0:* LISTEN 444/dnsmasq
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 874/sshd
tcp6 0 0 :::53 :::* LISTEN 444/dnsmasq
tcp6 0 0 :::22 :::* LISTEN 874/sshd
udp 0 0 0.0.0.0:28450 0.0.0.0:*   839/dhclient
udp 0 0 0.0.0.0:53 0.0.0.0:*   444/dnsmasq
udp 0 0 0.0.0.0:68 0.0.0.0:*   839/dhclient
udp 0 0 192.168.0.42:123 0.0.0.0:*   907/ntpd
udp 0 0 127.0.0.1:123 0.0.0.0:*   907/ntpd
udp 0 0 0.0.0.0:123 0.0.0.0:*   907/ntpd
udp 0 0 0.0.0.0:4784 0.0.0.0:*   909/ptmd
udp 0 0 0.0.0.0:3784 0.0.0.0:*   909/ptmd
udp 0 0 0.0.0.0:3785 0.0.0.0:*   909/ptmd
udp6 0 0 :::58352 :::*   839/dhclient
udp6 0 0 :::53 :::*   444/dnsmasq
udp6 0 0 fe80::a200:ff:fe00::123 :::*   907/ntpd
udp6 0 0 ::1:123 :::*   907/ntpd
udp6 0 0 :::123 :::*   907/ntpd
udp6 0 0 :::4784 :::*   909/ptmd
udp6 0 0 :::3784 :::*   909/ptmd

 

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