HOSTS(5) File Formats Manual HOSTS(5)NAME
hosts - hostname to IP address database
SYNOPSIS
/etc/hosts
DESCRIPTION
The hosts database lists the IP addresses and the hostnames that translate to these IP addresses. It is used by nonamed(8) in a network
without name servers. A simple /etc/hosts may look like this:
127.0.0.1 localhost
192.9.200.1 darask
192.9.200.2 burask
The localhost entry lists a special address that refers to the local host itself (a kind of /dev/tty for hosts.) You should only list it
if nonamed needs it! The other entries are actual machines. The file may contain comments marked with '#'.
You can have aliases (more hostnames on the same line), but it is not recommended, because nonamed can't present them to the system as
CNAME records. An often seen form like
192.9.200.1 darask.home.cs.vu.nl darask
is harmless though, and has the small advantage that you can use the short name in /etc/ethers so rarpd can match it at boot time.
FILES
/etc/hosts Hosts database.
SEE ALSO ethers(5), nonamed(8), rarpd(8), boot(8).
AUTHOR
Kees J. Bot (kjb@cs.vu.nl)
HOSTS(5)
Check Out this Related Man Page
RARPD(8) System Manager's Manual RARPD(8)NAME
rarpd - reverse address resolution protocol daemon
SYNOPSIS
rarpd [-d]
DESCRIPTION
Rarpd listens on the ethernet for broadcast packets asking for reverse address resolution. These packets are sent by hosts at boot time to
find out their IP address. Rarpd looks up the six octet ethernet number in the /etc/ethers file finding a host name. This name is trans-
lated to the IP address of the host by a DNS lookup. The IP address is then sent to the host.
Before rarpd can start its service it first finds out what the IP addresses of the ethernets are. It will look through /etc/ethers to map
the ethernet addresses to host names. It then uses /etc/hosts to map the host names to IP addresses. If this lookup fails then several
RARP requests are broadcasted in the hope that some RARP server knows the addresses. The IP addresses are eventually set in the same way
as ifconfig(8). (The address is not changed if already set with ifconfig.) Note that the host names in the ethers and hosts files must
match exactly. The DNS can not be used yet, so a simple name can't be translated to a fully qualified name.
Rarpd exits after startup if there are no active ethernets, or if there is no ethers file.
Warning! Sun diskless workstations assume that the first RARP server that answers is the host they are to boot from. For this to work all
other Sun RARP servers delay their answer if they are not also the requestors boot server. The Minix rarpd does not have this kludge so it
will happily engage the Sun boot server to see who can answer the client first. Unless your Minix host can actually serve a Sun diskless
client, it is better not to list any more hosts in the ethers file than necessary.
OPTIONS -d Turns on debugging messages. Debugging can also be turned on at runtime by sending signal SIGUSR1 or turned off with SIGUSR2.
SEE ALSO ifconfig(8), ethers(5), hosts(5), set_net_default(8), boot(8), inetd(8), irdpd(8), nonamed(8).
AUTHOR
Kees J. Bot (kjb@cs.vu.nl)
RARPD(8)
have edit the /etc/hosts as belows
123.45.12.55 mypc
so when i do a who, i can see my "mypc" BUT after i changed, i cant see "mypc"
do i have to restart anything? (6 Replies)
Hi,
I need to copy a file ( say 1MB file ) to multiple hosts( no of machines is huge).
What would be the most optimal way of doing it with minimal user intervention ?
Thanks,
Sumit (5 Replies)
hi all,
i want to know where i can add and IP address so when i do a "w", i can see what IP is assigned to which tty? i know in tru64 you just added an entry to /etc/hosts. this does not seem to be the case with hpux.
thanks (12 Replies)
Sorry noob here......
I have 2 files like this:
File A
8080000001 400
8080000002 300
8080000003 200
File B
8080000001 600
8080000002 200
8080000004 200
I want one file where
File OUT
8080000001 1000 (6 Replies)
Hy guys, I'm having a very strange problem, every time I change the /etc/hosts file on an Ubuntu machine @ work, every time I change the line:
127.0.0.1 programmer.COMPANY
to
127.0.0.1 programmer.COMPANY programmer
It works till the next reboot, now, I have never experienced this on... (5 Replies)
I want to change the following lines in /etc/hosts on FreeBSD:
::1 localhost localhost.my.domain
127.0.0.1 localhost localhost.my.domain
into the following lines
::1 localhost foo.example.com
127.0.0.1 localhost foo.example.com
I have the following script to do... (5 Replies)
This code is used to check for duplicate ip and hostnames in an /etc/hosts file
CENTRAL is path to /etc/hosts
AWK =awk
#check CENTRAL for duplicate ips or hostnames#
grep -v "^#" $CENTRAL | $AWK '{ print $1, $2; }' | \
while read ip hostname
do
if... (5 Replies)
I have a master list of hosts, and a list of bad hosts. I want to filter out the bad hosts from the master list. I was trying a few for loops but it's not providing the desired result:
for i in $(cat master_host_list);do grep -iv $i bad_host_list;done | sort | uniq
# won't work because it... (5 Replies)
Hello experts.
I trying to achieve 2 things here. I'm trying to convert all of the host names to lower case and add an "m" to each hostname. Can anyone provide some guidance on what I can do? Your input is greatly valued!
Here are the desired results:
1. read the host name from a file.
2.... (8 Replies)
I have a script to detect if a host is pingable or not. The problem is that I would like it to put the nonpingable hosts in one file and the pingable hosts in another. I have come up with this so far:
for ip in `cat /tmp/testlist2`; do ping -c 3 $ip >/dev/null && echo "$ip is up" || echo "$ip... (5 Replies)
ello,
i am new to the networking side.
I have a requirement to check the tcp network connectivity between server it's running on and the list of host's and ports combination.
please help me where i am going wrong.
my code:
#!/bin/bash
#read the file line by line
cd "$1"
cat... (17 Replies)
Can anyone help me to find the data and management IP address on a IBM unix server without looking at the /etc/hosts file. sometimes the hosts file may not make it obvious between the data & mgmt ip addresses. thanks (5 Replies)
I'm currently looking into ways to integrate the Telegram API into the forums:
Telegram Bots - Bot Code Examples
I'm thinking, first off, to use the Telegram API to get forum alerts and notifications (to Bot or Not?).
Second, I thinking of ways to more deeply integrate Telegram into the... (5 Replies)