** Reply to message from [EMAIL PROTECTED] on Thu, 12 Sep 2002 07:38:38 -0700


> In <[EMAIL PROTECTED]>, on
> 09/11/2002 at 09:44 PM,
>    Rupesh Moharana <[EMAIL PROTECTED]> said:
> 
> >       Can any one please help me to setup a dual NIC
> >gateway using linux os. I have tow ip address one is
> >for Global internet (etho) and another is for my local
> >intranet (eth1). My problem is using the network
> >configuration utility i have configured every
> >parameter for the global IP address in eth0. 
> 
> >IP Address.
> >Subnet mask.
> >default gateway.
> 
> Look in /etc/sysconfig
> 
> The file 'network' will contain your default route (gateway). The
> network-scripts directory will contain the startup scripts for each
> interface, ifcfg-eth0 and ifcfg-eth1.  These contain all the pertinent
> info for IP addres, subnet mask, etc for the appropriate interface.  
> 
> >DNS 1 ip address
> >DNS 2 ip address.
> 
> Look at /etc/resolv.conf.  This is your DNS resolver file, and that's
> where you specify your DNS servers.
> 
> You'll also need to set up IP Forwarding.  Normally this is done by
> 
> `echo 1 > /proc/sys/net/ivp4/ip_forward`
> 
> But that only sticks until the next reboot, by which time you will have
> completely forgotten about it.  (Might be months or years from now.)  That
> means the command needs to be in a startup script somewhere.  If you don't
> have ip_forward set, you won't get communication in one interface and out
> the other.

Insert the following line into your /etc/sysctl.conf:

#Controls IP packet forwarding
net.ipv4.ip_forward = 1

If the lines are already there, make sure it is set to "1" and then restart your 
sysctl.conf by running (as root) :

/sbin/sysctl -p

That should set you up without having to reboot and will ensure that packet forwarding 
will be enabled on subsequent reboots.

jb



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