Question

2

Brief detail on hosts file

rated 0 times [ 2] [ 0] / answers: 1 / hits: 528 / 2 Years ago, sat, march 19, 2022, 7:07:27

Can somebody explain what does this mean? Explanation to each line will be helpful. I have mentioned some of my queries in comments too.

127.0.0.1 localhost //According to @Dave, it's machine ip.

127.0.1.1 dell-Inspiron-342 // then what is this ip of?

The following lines are desirable for IPv6 capable hosts

::1 ip6-localhost ip6-loopback

fe00::0 ip6-localnet

ff00::0 ip6-mcastprefix

ff02::1 ip6-allnodes

ff02::2 ip6-allrouters

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answered 2 Years ago velelf · Accepted Answer

127.0.0.1 is the IP address for local machine. That means the machine you are working on and it is the same for all of us (we all have this). This line should not be messed with.

127.0.1.1. Section 10.4 of the debian manual:

Some software (e.g., GNOME) expects the system hostname to be resolvable to an IP address with a canonical fully qualified domain name. This is really improper because system hostnames and domain names are two very different things; but there you have it. In order to support that software, it is necessary to ensure that the system hostname can be resolved. Most often this is done by putting a line in /etc/hosts containing some IP address and the system hostname. If your system has a permanent IP address then use that; otherwise use the address 127.0.1.1.

Is added due to this bug: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=719621

Both of these IPs are IPv4. Since the world is running out of IP addresses there is also IPv6. Where IPv4 uses 4 numbers from 0 to 255 (roughly; so 2**32 permutations) IPv6 addresses are 128 bits long (so 2*128 permutations) used in 8 groups of 4 hexadecimal digits.

These ...

::1 ip6-localhost ip6-loopback

fe00::0 ip6-localnet

ff00::0 ip6-mcastprefix

ff02::1 ip6-allnodes

ff02::2 ip6-allrouters

are all IPv6 versions. ::1 is the IPv6 version of 127.0.0.1 so also means local host.

These are multicast addresses:

Well-known IPv6 multicast addresses

Address     Description

ff02::1     All nodes on the local network segment

ff02::2     All routers on the local network segment

ff02::5     OSPFv3 All SPF routers

ff02::6     OSPFv3 All DR routers

ff02::8     IS-IS for IPv6 routers

ff02::9     RIP routers

ff02::a     EIGRP routers

ff02::d     PIM routers

ff02::16    MLDv2 reports (defined in RFC 3810)

ff02::1:2   All DHCP servers and relay agents on the local network segment (defined in RFC 3315)

ff02::1:3   All LLMNR hosts on the local network segment (defined in RFC 4795)

ff05::1:3   All DHCP servers on the local network site (defined in RFC 3315)

ff0x::c     Simple Service Discovery Protocol

ff0x::fb    Multicast DNS

ff0x::101   Network Time Protocol

ff0x::108   Network Information Service

ff0x::114   Used for experiments