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Full Discussion: Changing ip in a custom way
Top Forums UNIX for Dummies Questions & Answers Changing ip in a custom way Post 302341568 by Wonderke on Thursday 6th of August 2009 07:23:36 AM
Old 08-06-2009
Changing ip in a custom way
Hi.
I hope someone can help me. I have e very special question.
I have a Lunix server and I have installed Webmin on it. This way, I can create a login for an other user and give him restricted access to some custom commands I set up.
One of the commands i would like to setup, is for him to change the ip adress. With Webmin, I have the option to edit files en perform commands afterwards, so my first thought was to edit the ifcfg-eth'x' file (x because i have several network cards). But the file contains too much data, for I want him to only be able to change the IP-adress, Netmask and Gateway (of 1 of the cards).
Standard it looks something like this:

# Intel Corporation 80003ES2LAN Gigabit Ethernet Controller (Copper)
DEVICE=eth0
BOOTPROTO=none
BROADCAST=192.168.101.255
IPADDR=192.168.101.91
IPV6INIT=no
IPV6_AUTOCONF=yes
NETMASK=255.255.255.0
NETWORK=192.168.101.0
ONBOOT=yes
GATEWAY=192.168.101.1
TYPE=Ethernet
PEERDNS=yes
USERCTL=no

when actually I would only need something like this:

IPADDR=192.168.101.91
NETMASK=255.255.255.0
GATEWAY=192.168.101.1

Is there a way to link the original file to a new file, and when they edit teh new file, because of the link the original file will also be edited (the identical lines as IPADDR etc), and after which i give the command to restart the network devices, which allows the user to change only the given data in that new file, and so make him activate these new settings.

I hope I was clear enough; I know its something strange, but i need it in a very specific service.

thanks in advance!
 

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LEARN ABOUT FREEBSD

nos-tun

NOS-TUN(8)						    BSD System Manager's Manual 						NOS-TUN(8)

NAME

     nos-tun -- implement ``nos'' or ``ka9q'' style IP over IP tunnel

SYNOPSIS

     nos-tun -t tunnel -s source -d destination -p protocol_number [source] target

DESCRIPTION

     The nos-tun utility is used to establish an nos style tunnel, (also known as ka9q or IP-IP tunnel) using a tun(4) kernel interface.

     Tunnel is the name of the tunnel device /dev/tun0 for example.

     Source and destination are the addresses used on the tunnel device.  If you configure the tunnel against a cisco router, use a netmask of
     ``255.255.255.252'' on the cisco.	This is because the tunnel is a point-to-point interface in the FreeBSD end, a concept cisco does not
     really implement.

     Protocol number sets tunnel mode.	Original KA9Q NOS uses 94 but many people use 4 on the worldwide backbone of ampr.org.

     Target is the address of the remote tunnel device, this must match the source address set on the remote end.

EXAMPLES

     This end, a FreeBSD box on address 192.168.59.34:

	   nos-tun -t /dev/tun0 -s 192.168.61.1 -d 192.168.61.2 192.168.56.45

     Remote cisco on address 192.168.56.45:

	   interface tunnel 0
	   ip address 192.168.61.2 255.255.255.252
	   tunnel mode nos
	   tunnel destination 192.168.59.34
	   tunnel source 192.168.56.45

AUTHORS

     Nickolay N. Dudorov <nnd@itfs.nsk.su> wrote the program, Poul-Henning Kamp <phk@FreeBSD.org> wrote the man-page.  Isao SEKI
     <iseki@gongon.com> added a new flag, IP protocol number.

BUGS

     We do not allow for setting our source address for multihomed machines.

BSD
								  April 11, 1998							       BSD
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