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Special Forums IP Networking Sharing Adsl Link Post 302138526 by royashoya on Tuesday 2nd of October 2007 07:32:13 AM

10-02-2007

Registered User

Sharing Adsl Link

Hi guyz,

got a little bit of a situation here. we are sharing an ADSL link with
another organization. so there are 2 networks.
network 1:
has the adsl router and the whole n/w is on subnet 192.168.0.*
the adsl router has its ip as 192.168.0.1

network 2(now us):
we have set up a linux box running Centos 4.3 to act as a firewall,
proxy and dhcp + file server. our network is on subnet 192.168.1.*
the linux box has two NICS:
eth0:192.168.1.1
eth1:192.168.0.6 (varies since it takes ip dynamically from the adsl
router on n/w 1)
on our network we have a domain running on 2003 server....n our dns is
also on the 2003 machine.

scenario:
from the linux box.....i can be able to surf the net, but all the
other client machines on our network (192.168.1.*) cannot access the
net. i cannot ping the adsl router or any 192.168.0* address from the
client machines, but i can do all that on the linux box.

now am suspecting i need a NAT....or a router to join the 2 networks.
however, i would like to utilize the linux box for the job (as a
NAT/ROUTER).

Can anyone help me get through this situation....i really need to sort
this out!
or if anyone can help me get the client machines access the other
n/w.....i would be grateful...coz then i can proceed n share the link.

royashoya

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vlan-interfaces

VLAN-INTERFACES(5)						   File formats 						VLAN-INTERFACES(5)

NAME

       /etc/network/interfaces (vlan) - vlan extensions for the interfaces(5) file format

DESCRIPTION

       /etc/network/interfaces	contains  network  interface  configuration  information  for  the  ifup(8)  and ifdown(8) commands.  This manpage
       describes the vlan extensions to the standard interfaces(5) file format.

       Primary extensions exist to make and destroy vlan interfaces, secondary extensions exist for ipv4 interface manipulation which  are  gener-
       ally needed when using (a lot of) vlans.

VLAN CREATION

       Vlan  interface	definitions  exist  of the vlan interface name, and an optional 'raw-device' parameter.  Vlan interfaces are numbered 1 to
       4095.  You have the option to have interface names zero-padded to 4 numbers, or just the plain digits without leading zero.  The  following
       example shows four ways to create a vlan with id 1 on interface eth0.  They all result in different names.

	iface eth0.1 inet static
	    address 192.168.1.1
	    netmask 255.255.255.0

	iface vlan1 inet static
	    vlan-raw-device eth0
	    address 192.168.1.1
	    netmask 255.255.255.0

	iface eth0.0001 inet static
	    address 192.168.1.1
	    netmask 255.255.255.0

	iface vlan0001 inet static
	    vlan-raw-device eth0
	    address 192.168.1.1
	    netmask 255.255.255.0

	# We don't have br support out of the box
	iface br0.2 inet static
	    vlan-raw-device br0
	    address 192.168.1.1
	    netmask 255.255.255.0

	# Aliases are ignored
	iface br0.2:1 inet static
	    address 192.168.1.1
	    netmask 255.255.255.255

EXTRA IFACE OPTIONS

       Usually someone who uses vlans also wants to do some other manipulations with the ip stack or interface.

       vlan-raw-device devicename
	      Indicates the device to create the vlan on.  This is ignored when the devicename is part of the vlan interface name.

       ip-proxy-arp 0|1
	      Turn proxy-arp off or on for this specific interface.  This also works on plain ethernet like devices.

       ip-rp-filter 0|1|2
	      Set the return path filter for this specific interface.  This also works on plain ethernet like devices.

       hw-mac-address mac-address
	      This sets the mac address of the interface before bringing it up.  This works on any device that allows setting the hardware address
	      with the ip command.

AUTHOR

       This manpage was adapted from interfaces(5) by Ard van Breemen <ard@kwaak.net>

SEE ALSO

       vconfig(8) interfaces(5)

vlan								 September 30 2007						VLAN-INTERFACES(5)