Home Linux Networking Lab questions

[mary talpas]

I am attempting to modify Nosmo VM's DNS address. I see the instructions calls for iptables to redirect the route from buttercup(campus) to my router(apple extreme). I use the command listed
iptables -t nat -R PREROUTING 1 -d 207.62.187.54 -j DNAT --to-destination 192.168.1.254

I believe my ip router address is suppose to replace 192.168.0.1. Is this correct? Am I suppose to put my external ip address in place of 207.62.187.54? Because I don't see where the 207.62.187.54 address is in Nosmo's table.

I can find some of what this command is doing in my book but not all of it. Can you describe the command?

then i change resolv.conf with
echo nameserver 192.168.1.254 > /etc/resolv.conf

change Frodo and Elrond to use custom VMnet2 instead of the Bridge.

Add the static route 192.168.1.2 to my router?

Can you reply and clarify my questions?
Mary

[Jonathan Simms]

Mary here is what I have for my nosmo configuration:

/etc/sysconfig/iptables

# Generated by iptables-save v1.2.7a on Thu Jan 8 16:04:13 2009
*nat
REROUTING ACCEPT [16:2930]
OSTROUTING ACCEPT [1:108]
:OUTPUT ACCEPT [1:108]
-A PREROUTING -d 207.62.187.54 -j DNAT --to-destination 192.168.1.1
COMMIT
# Completed on Thu Jan 8 16:04:13 2009

/etc/resolv.conf

; generated by /sbin/dhclient-script
search cruzio.com
nameserver 74.220.64.45
nameserver 74.220.64.55

I used DHCP for nosmo's eth0 interface and then reserved the IP address for nosmo based on nosmo's MAC address in my home Linksys router.

/etc/sysconfig/network-scripts/ifcfg-eth0

check_link_down () {
return 1;
}

DEVICE=eth0
BOOTPROTO=dhcp
#BROADCAST=192.168.0.255
#IPADDR=192.168.0.2
#NETMASK=255.255.255.0
#NETWORK=192.168.0.0
ONBOOT=yes

Hope that helps some.

[Jonathan Simms]

Hi Mary,

I went home and got nosmo to work without DHCP because what I hadn't done previously was change /etc/syconfig/network from:

[code]NETWORKING=yes
HOSTNAME=nosmo
GATEWAY=192.168.1.0
[/code]

to

[code]NETWORKING=yes
HOSTNAME=nosmo
GATEWAY=192.168.1.1
[/code]

I set the interface file for eth0 back to static and everything works great.

Also what is the IP of the default gateway of your router? Because normally it is 192.168.x.1