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Full Discussion: Ftp, telnet etc. not operational?
Top Forums UNIX for Dummies Questions & Answers Ftp, telnet etc. not operational? Post 302069817 by RTM on Wednesday 29th of March 2006 10:07:15 AM
Old 03-29-2006
Your /etc/hosts.deny file should look like this (lines without # in front of them):
ALL:ALL

This sets it so everything is denied from everywhere.

Then, you set up your hosts.allow to allow only what you want.

ALL: 127.0.0.1

This would allow ftp, telnet, ssh, r* commands, etc... to localhost from localhost (localhost should be the system you are working on).

If you have another system (PC, UNIX, whatever) that you want to add to allow it to telent or ftp or ssh into this system, you have to add a line for it - by either putting in the IP or the IP range.

Let's say the other system has a IP of 192.168.0.100. and you want to ssh from it to the Linux system. On the Linux system, add the following to /etc/hosts.allow - this will allow ANY system within the IP range of 192.168.0.XXX to connect.

sshd: 192.168.0.

If you only want one IP to connect:

sshd: 192.168.0.100

These will allow ssh only - to have ftp or telnet, you would either change the sshd to ALL (NOT recommended) or add lines to specify each individual protocol you want to add. Suggest you start with one and add on as needed.

sshd: 192.168.0.100
in.ftpd: 192.168.0.100
in.telnetd: 192.168.0.100
in.rlogind: 192.168.0.100
 

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LEARN ABOUT DEBIAN

oidentd_masq.conf

oidentd_masq.conf(5)						File Formats Manual					      oidentd_masq.conf(5)

NAME

       oidentd_masq.conf - oidentd IP masquerading/NAT configuration file.

DESCRIPTION

       If you are using IP masquerading or NAT, oidentd can optionally return a username for connections from other machines.  Support for this is
       specified by calling oidentd with the -m (or --masq) flag and by creating an /etc/oidentd_masq.conf file.

       oidentd can also forward requests for an IP masqueraded connection to the machine from which connection originates by way of the -f option.
       This  will  only  work if the host to which the connection is forwarded is running oidentd with the -P (proxy) flag, or if the host's ident
       daemon will return a valid reply regardless of the input supplied by and the address of the host requesting the info  (some  ident  daemons
       for windows do this, maybe others).

FORMAT

       <IP Address|Hostname>[/<Mask>] <Ident Response> <System Type>

       The  first  field  contains the IP address or the hostname of a machine that IP masquerades through the machine on which oidentd runs.  The
       mask parameter can be either a network mask or a mask in CIDR notation.	A mask of 24 is equivalent to  255.255.255.0,  a  mask	of  16	is
       equivalent to 255.255.0.0, etc.

       The second field specifies the reply that oidentd will return for lookups to the host matching the IP address specified in the first param-
       eter.

       The third field specifies the operating system the machine matching the first parameter is running.

EXAMPLES

       <Host>[/<Mask>]		<Ident Response>    <System Type>
       192.168.1.1		     someone		 UNIX
       192.168.1.2		     noone		 WINDOWS
       192.168.1.1/32		     user1		 UNIX
       192.168.1.0/24		     user3		 UNIX
       192.168.0.0/16		     user4		 UNIX
       somehost 		     user5		 UNIX
       192.168.1.0/255.255.255.0     user6		 UNIX

AUTHOR

       Ryan McCabe <ryan@numb.org>
       http://dev.ojnk.net

SEE ALSO

       oidentd(8) oidentd.conf(5)

version 2.0.8							    13 Jul 2003 					      oidentd_masq.conf(5)
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