Opened UDPv4 socket fd=3 remote=127.0.0.1:323įirst chronyd and chronyc try to talk over dynamic unix socket and failing which they fall back to UDP socket session (in this case). GNU General Public License version 2 for details.Ĭould not remove /run/chrony/ : Permission deniedĬould not bind Unix socket to /run/chrony/ : Permission denied You are welcome to redistribute it under certain conditions. Curnow and othersĬhrony comes with ABSOLUTELY NO WARRANTY. Both chronyc and chronyd speaks over UDP socket session over loopback ip. So, question is, what is it doing with that?Ĭhronyc is the utility of chrony package, admin uses it to write new changes to be done on chronyd. See chronyd, it is running over local udp port#323 on 127.0.0.1. Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name Lets see few applications running in my laptop and using loopback ip network-scripts]$ sudo netstat -tulnpĪctive Internet connections (only servers) Essentially, these are local applications which have to communicate with each other but they don’t need to send traffic outside or need rout-able traffic. Using the loopback interface bypasses any local network interface hardware. So, loopback interface/ip is used to access the network services that are running on the host via the loopback network interface. But still it is unclear what is its purpose in localhost system. Ok, so there is a loopback interface with its reserve ip and user can ping that ip or mapped domain name. ::1 localhost localhost.localdomain localhost6 ~]# So, why i am able to ping my localhost? Answer is, static local dns infrared]$ ping localhostĦ4 bytes from (127.0.0.1): icmp_seq=1 ttl=64 time=0.101 msĦ4 bytes from (127.0.0.1): icmp_seq=2 ttl=64 time=0.088 msĢ packets transmitted, 2 received, 0% packet loss, time 1000ms There is reserved ipv6 address for loopback and lets ping that as ~]# ping6 ::1Ħ4 bytes from ::1: icmp_seq=1 ttl=64 time=0.029 msĦ4 bytes from ::1: icmp_seq=2 ttl=64 time=0.014 msĦ4 bytes from ::1: icmp_seq=3 ttl=64 time=0.028 msģ packets transmitted, 3 received, 0% packet loss, time 2038ms ping statistics -Ģ packets transmitted, 2 received, 0% packet loss, time 1018ms Let me ping my hostname as infrared]$ infrared]$ ping IANA has reserved 127.0.0.0/8 ip address range for loopback interfaces in the localhost. Today, thought of a blog came in my mind where I shall explain more about loopback interfaces and try to find why and how it exist in the networking space. Long time ago, around the beginning of my career, Once I was asked about loopback interface in an interview.
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