05-30-2001
This depends on what name resolution mechanism you are using - files, NIS/NIS++, DNS? From your question I will assume you are using files in which case hostnames are mapped to IP addresses in /etc/hosts thus:
[ip_address] [hostname] [alias]
A remote login can be done via a number of ways, rlogin is one. If you have the hostname mapped to an ip address in /etc/hosts the syntax would be
rlogin [hostname]
You could also use telnet
telnet [hostname]
Or rsh and ssh in exactly the same way.
Of course routes and networking has to be set up in order for you to be able to talk to the other machine, and if you are sitting in an infrastructure where firewalls determine access control certain forms of communication between machine may be disallowed by firewall rules (i.e. certain ports blocked).
Hope this helps.
Regards.
8 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
Hi!
Im new to all this but the computer club im in has unix i think.
now my questions.
1.is it NTFS i need to partion the harddrive with to be able to use unix?
2.Unix and Linux whats the diffrense?yes im a noob got no idea been using crap windows for ages and hate it.
3.I got a win98... (2 Replies)
Discussion started by: Pierre
2 Replies
2. Programming
What does "extern" do?
ex. extern int x;
and another question, what about using static in functions? like: static void foo(), why? (2 Replies)
Discussion started by: Esaia
2 Replies
3. Solaris
Hello Everbody
I hope you can give me a hand, I have some questions
The first one itīs about some message that I donīt know what means, I was looking about it. but nothing. This is the message
rsh: connection from bad port
bsd-gw: Error reading from connection: Bad file number
And my... (4 Replies)
Discussion started by: lo-lp-kl
4 Replies
4. UNIX for Dummies Questions & Answers
Hi everyone im new to this forums, i just wanted to get started by asking a few question(Im a Unix newbie)
1. How do i sort a file called "dirr" in a ascending order on the 3rd column
2. what does alias on=who do
Thanks in advance!!! (1 Reply)
Discussion started by: Da Paper
1 Replies
5. Programming
hey all, I have question when am writing simple shell...
in the child am calling execvp, i want the parent to know when execvp returns - 1. how can i let the parent know the result of execvp
thanks in advance (9 Replies)
Discussion started by: joey
9 Replies
6. Homework & Coursework Questions
1.) I am to write scripts that will be phasetest folder in the home directory.
2.) The folder should have a set-up,phase and display files
I have written a small script which i used to check for the existing users and their password.
What I need help with:
I have a set of questions in a... (19 Replies)
Discussion started by: moraks007
19 Replies
7. UNIX for Dummies Questions & Answers
1) The lpr and sort utilities accept input either from a file named on the command line or from standard input.
a)Name two other utilities that function in a similar manner.
b)Name a utility that accepts its input only from standard input.
2) Explain the following error message. What... (10 Replies)
Discussion started by: youngyou
10 Replies
8. UNIX for Dummies Questions & Answers
Hello,
I would like to know how we can highlight/select a section of a file in vi and delete that section if we don't want to use the dd command to delete one line at at time. There is one where we don't want to delete the whole line , but up to a certain word. (2 Replies)
Discussion started by: Pouchie1
2 Replies
LEARN ABOUT OSX
hosts.equiv
HOSTS.EQUIV(5) BSD File Formats Manual HOSTS.EQUIV(5)
NAME
hosts.equiv, .rhosts -- trusted remote hosts and host-user pairs
DESCRIPTION
The hosts.equiv and .rhosts files list hosts and users which are ``trusted'' by the local host when a connection is made via rlogind(8),
rshd(8), or any other server that uses ruserok(3). This mechanism bypasses password checks, and is required for access via rsh(1).
Each line of these files has the format:
hostname [username]
The hostname may be specified as a host name (typically a fully qualified host name in a DNS environment) or address, +@netgroup (from which
only the host names are checked), or a ``+'' wildcard (allow all hosts).
The username, if specified, may be given as a user name on the remote host, +@netgroup (from which only the user names are checked), or a
``+'' wildcard (allow all remote users).
If a username is specified, only that user from the specified host may login to the local machine. If a username is not specified, any user
may login with the same user name.
EXAMPLES
somehost
A common usage: users on somehost may login to the local host as the same user name.
somehost username
The user username on somehost may login to the local host. If specified in /etc/hosts.equiv, the user may login with only the same
user name.
+@anetgroup username
The user username may login to the local host from any machine listed in the netgroup anetgroup.
+
+ +
Two severe security hazards. In the first case, allows a user on any machine to login to the local host as the same user name. In the
second case, allows any user on any machine to login to the local host (as any user, if in /etc/hosts.equiv).
WARNINGS
The username checks provided by this mechanism are not secure, as the remote user name is received by the server unchecked for validity.
Therefore this mechanism should only be used in an environment where all hosts are completely trusted.
A numeric host address instead of a host name can help security considerations somewhat; the address is then used directly by iruserok(3).
When a username (or netgroup, or +) is specified in /etc/hosts.equiv, that user (or group of users, or all users, respectively) may login to
the local host as any local user. Usernames in /etc/hosts.equiv should therefore be used with extreme caution, or not at all.
A .rhosts file must be owned by the user whose home directory it resides in, and must be writable only by that user.
Logins as root only check root's .rhosts file; the /etc/hosts.equiv file is not checked for security. Access permitted through root's
.rhosts file is typically only for rsh(1), as root must still login on the console for an interactive login such as rlogin(1).
FILES
/etc/hosts.equiv Global trusted host-user pairs list
~/.rhosts Per-user trusted host-user pairs list
SEE ALSO
rcp(1), rlogin(1), rsh(1), rcmd(3), ruserok(3), netgroup(5)
HISTORY
The .rhosts file format appeared in 4.2BSD.
BUGS
The ruserok(3) implementation currently skips negative entries (preceded with a ``-'' sign) and does not treat them as ``short-circuit'' neg-
ative entries.
BSD
November 26, 1997 BSD