Problems remotely changing IP address of second NIC

[Alex White]

Seth Art wrote:
> I am wondering if anyone knows what i am doing wrong.   This has been
> bothering me for months.  I have a Fedora Core 2 machine in another
> city that i monitor remotely.  It has 2 NICS.  One of them is
> connected to a LAN and has an IP address always.  I use this to ssh
> into the box on a daily basis.  The other card is in promiscuous mode
> with no IP address and sniffs traffic from a DMZ.  (if you haven't
> guessed yet its a snort box).     Every once and a while there comes a
> need for me to give the card on the DMZ an IP address temporarily.
> 
> This is what i do:
> 
> 1) I SSH into to the LAN CARD, become root.  
> 2) I then use system-config-network-gui though the ssh connection to
> get a nice gui from the remote machine.
> 3) There is no DHCP server on the DMZ so i give it a static address on
> the same subnet, set subnet mask to 255.255.255.0 and default gateway
> to the correct default gateway.
> 4) I then apply changes and activate the card.
>
> Is there something i am doing wrong?   Is there a better more
> effective way accomplish what i am doing?
> 
> Thanks for all your help,
> Seth

You could try the following:

ifconfig ethx x.x.x.x netmask x.x.x.x gw x.x.x.x

This will temporarily assign the card (either eth0 or eth1 I don't know 
which for you) the ip address it needs as well as the netmask and proper 
gateway. If you do the following the card will go back to it's original 
configuration:

ifconfig eth0 down
ifconfig eth0 up

This is assuming that the card is eth0 it may be eth1 for you. You can 
also accomplish the same by editing 
/etc/sysconfig/network-scripts/ifcfg-ethx to edit the card's info and 
then reload it's config as such

ifconfig ethx down
ifconfig ethx up

And there you have it. This should function for you.

HTH

Alex White