How do I configure my Network to work

Paddyman · #1 14th March 2007, 04:43 AM

Hello I have the following settings:

2 machines with Centos installed in both. Each has 2 Network cards. 1 normal ethernet card and a GigE card.
1 Machine which is my destop is connected to a router using normal ethernet card. The desktop is connected to the only monitor. The GigE card on the desktop machine is connected to the other GigE card in the second machine which is the server. The server is not connected to the router, thus does not access the internet. The server is not also connected to a monitor. My network link b/w the desktop and the server is CAT6 which is connected to both ends of the GigE card.

Now I want to access my server in my private network but I can't. What should I do or need to preconfigure before I can access the server. I would be greatful to any hel please.

silvagroup · #2 14th March 2007, 06:46 AM

Might want to check the howto section.

Paddyman · #3 14th March 2007, 05:50 PM

Thank you silvagroup. I have checked the howto section but nothing suits my type of connection.
This is actaully how my network looks like: It was suggested to me by one user in this forum:

Code:

Then for higher secuirty (of the server at least) I would add a second ethernet card to 
the desktop and (normally) not have the server have acces to the internet. During install 
you will (essentially) have to have the sever have access to the internet(for updates). 
When you install or do updates it would be easies just to swap the ethernet cables to 
grant the server access to the internet. This will mean you will have two separate 
networks. One with the desktop going out to the internet(small) and the second with 
the desktop and the server(later servers). When you add more servers you will have to add
another switch(or router) between the desktop and the servers.

So, (for ethernet on your desktop) you would plug desktop->router->modem. 
The server (to start with) would plug into the second ethernet port on your desktop. 
Later it would go server(s)->switch(or second router)->desktop 2nd ethernet port.

Depending on the amount of data you will be pushing between the desktop and the server 
you may (probably) want to use GigE on all your ethernet equipment rather
than regular 100 ethernet.

My installation looks exactly like the suggestions above.
My problem now is how do I make both PCs to communicate using the GigE on both machines? How do I set up the IP addresses?I am absoluetly new to linux and networking in general. I would appreciate any help please. Please help
Paddy
Paddy

alukin · #4 14th March 2007, 06:37 PM

Is routing enabled on hosts with 2 ehers?
cat /proc/sys/net/ipv4/ip_forward
if it is 0 then routing disabled and you must
echo 1 >/proc/sys/net/ipv4/ip_forward and check routing tables

To allow routing permanently check /etc/sysctl.conf:
# Controls IP packet forwarding
net.ipv4.ip_forward = 1

silvagroup · #5 14th March 2007, 06:59 PM

WOW

, you may find this of intrest http://blogs.sun.com/barts/.

Paddyman · #6 14th March 2007, 09:22 PM

This site

Code:

 http://blogs.sun.com/barts/

does not help me in any way. Too much talk and no example on how to configure my type of private network
Thank you any way.

Paddyman · #7 15th March 2007, 07:22 PM

I am able to configure my network so that I can ping the server. The server is responging. But when I try to vnc into the server I get an error

Code:

main: unable to connect to host: Connection refused (111)

I started the vncserver from the desktop as follows:

Code:

service vncserver start (it was ok) 
vncserver 
then 
vncviewer.

That's when I receive the error message
main: unable to connect to host: Connection refused (111)
Any idea what I might be doing wrong?