|
|
|
This thread is locked; no one can reply to it.
|
1
2
|
| setting up network for prime searching |
|
William Labbett
Member #4,486
March 2004
 |
Yup. I got a super fan for the CPU but I was awaiting my Power Supplies I'd ordered which I've got ubuntu 12 point something (64-bit). I thought I'd use this machine as the main machine which is 'in charge' of all the other machines. So now it's time to try and set up the network. I've got an ethernet switch and a bunch of ethernet cables. My other 4-core machine will be up and running soon (I was waiting for the quiet PSU). I reckon allegro.cc can get the network running despite I not having a clue about networks. I think I've got everything that's needed. I'd be grateful if allegro.cc could temporarily make-believe that I'm on a remote planet trying to set up a surface to air missile strike on a meteor that is bound for earth at hyperspeed. I await your instructions.
|
|
Thomas Fjellstrom
Member #476
June 2000
 |
So, is this a separate switch to your internet modem/router? If its a separate switch, plug all of the machines into the switch, and that switch into your router. Or if you don't have a separate switch, just plug them into your router. If they don't need to be connected to the internet, just don't plug them into the router (you will need a separate switch for that). Modern ethernet is pretty plug and play (if you have a router of some kind). So yeah, easiest way is to plug the machines into your switch, and the switch into your modem/router. -- |
|
William Labbett
Member #4,486
March 2004
|
Thanks Thomas. Thomas Fjellstrom said: So, is this a separate switch to your internet modem/router? Yes. It's a unit. Quote: If its a separate switch, plug all of the machines into the switch, and that switch into your router. Done that (I think). The switch has got 8 ethernet lead sockets on the back. All the sockets look the same. I've plugged the main machine in, plus my 4-core that's now working. Also I've plugged a lead in which connects to my router. Now to be able to control the 4-core from the main machine and to be able to monitor what's going on on it. Is this possible?
|
|
Thomas Fjellstrom
Member #476
June 2000
|
Just install SSH and log into each one -- |
|
William Labbett
Member #4,486
March 2004
|
Right. I think ssh is installed. Can you explain what I need to do to login to another machine connected to the switch. I know how to start : Ctrl Alt T to open a terminal. What after that ?
|
|
Thomas Fjellstrom
Member #476
June 2000
|
Heh. Install Putty or Kitty (if you're in windows), and use that to connect to the other machines. You'll need to find their IP address from your router, it should have a list of addresses it's recently given out to machines. Otherwise you'll have to log into their console and get the ip from them directly using the ifconfig command. -- |
|
William Labbett
Member #4,486
March 2004
|
I've installed Putty. I've got to the page for the router but I can only see one ip address. Where do I find the ip addesses of the other machines ?
|
|
Thomas Fjellstrom
Member #476
June 2000
|
on your router you'd look for the DHCP settings. Should have a list of mac->ip addresses somewhere. Might not, but some ISP routers really suck. If you cant find it there, you can scan for the machines using ping, going through all 254 ip addresses :-x -- |
|
William Labbett
Member #4,486
March 2004
|
I've got to that kind of page. There were some old entries for when I had my machines connected to the router. Refreshing the list got them deleted. It doesn't say anything about any other machine being connected. I've got a feeling that the ethernet lead from the 2nd machine should be connected to the router itself. At the moment the ethernet switch is connected to the router and the two machines are connected to the switch. I can't get on to the internet with the other machine so I guess I've not connected it up properly.
|
|
Thomas Fjellstrom
Member #476
June 2000
|
Hm, when did you connect those machines? after or before you started them up? You can either log into them and run ifdown eth0 && ifup eth0, or you can just reboot. And they should come online. -- |
|
William Labbett
Member #4,486
March 2004
|
Nope. It didn't work but I've plugged the computer straight into the router (ie not into the switch) and now it connects. So I presume any PC I plug into the router will
|
|
Thomas Fjellstrom
Member #476
June 2000
|
Hm, any normal switch should work fine... What kind of switch is it? can you post the model/brand? How old are the other computers? It's possible they don't like the type of cables you're using. Or, you haven't plugged the switch into the power outlet. -- |
|
William Labbett
Member #4,486
March 2004
|
Yup. That's what it is. I couldn't find the adapter when I was sorting things out and then I forget that I'd never found it before I got started. I've been looking around my flat but can't find it. I've a horrible feeling I threw it out when I was sorting things out. I'll to get a power supply for it somehow.
Until then I can try with the router. I've got to get on with the maths right now though but I'll be back later. Thanks very much for the help.
|
|
Thomas Fjellstrom
Member #476
June 2000
|
No problem. -- |
|
William Labbett
Member #4,486
March 2004
|
Great news. Found the adapter in one of my kitchen cupboards. EDIT : I've tried it with the power plugged in but I get the same problem. The ethernet switch is EDIMAX ES-3208P
|
|
Thomas Fjellstrom
Member #476
June 2000
|
reboot one of the computers when its plugged into the switch. -- |
|
Peter Hull
Member #1,136
March 2001
|
Are both machines running linux of some sort? If so, try plugging them both into your router and running nmap on the main computer. inet addr:x.y.z.4 Bcast:x.y.z.255 Mask:255.255.255.0 then run nmap x.y.z.0/24
should show all the machines on that network (one will be the router itself) 22/tcp open ssh
If not install openssh-server on that computer ssh user@host If that's OK you can try connecting them through the switch instead and confirming it still works. pete
|
|
William Labbett
Member #4,486
March 2004
|
Hi Pete. Thanks for the help. I've run nmap (after installing it) on the main machine (with ubuntu on). I ran ifconfig. Got 192.168.1.68 for the this machine. I therefore know that my other linux machine has ip address 192.168.1.66 (because there's only three listed on the BTHomeHub screen and the other one's got windows on it). I then ran nmap and this seems to be of great significance :- report on william-PC.home (192.168.1.66) All 1000 scanned ports are closed. When I try to connect to the machine with ssh - I always get 'connection refused'. Should I be logging in with the Administrator's username for the machine I'm trying to log onto - or some other username ?
|
|
Thomas Fjellstrom
Member #476
June 2000
|
If the ports are closed, ssh isn't running, and may not be installed. You'll need to make sure its installed and running. And you'd need to use the admin creds for the machine you're logging into. -- |
|
Peter Hull
Member #1,136
March 2001
|
If the port is closed that implies the ssh service (sshd) is not running on William-PC.home. If you're using Debian or Ubuntu you might well need to install sshd on William-PC.home. Use your package manager/software centre and look for openssh-server. If using Ubuntu software centre you'll need to 'Show technical items' You can test it by logging into the same machine with ssh localhost (see attachment) [edit] Beaten!
|
|
Thomas Fjellstrom
Member #476
June 2000
|
Peter Hull said: [edit] Beaten! Thats ok, you totally win the thread with the nmap comment. I didn't want to get into that... It would have been fine if he just logged in to the machine and did an ifconfig like I suggested.... -- |
|
William Labbett
Member #4,486
March 2004
|
I've installed ssh server thing on 'the other machine'. I do ssh WilliamLabbett@192.168.1.66 then it asks for the password 'for the machine'. I type in the password for WilliamLabbett and it always says Permission denied, please try again (everytime I try again).
|
|
Peter Hull
Member #1,136
March 2001
|
Obvious things to check:
If you're sitting in front of 192.168.1.66 try 'whoami' to check username and 'ssh localhost' to check you log in locally.
|
|
William Labbett
Member #4,486
March 2004
|
Thanks Peter. The whoami command revealed that I should have been using william as the username. I'm a bit confused now because I log in as WilliamLabbett but my username is william So now I can control one machine from another! Pleased about that. Now mprime starts up when I boot the other machine, so I'm not sure what I'm doing when I run the program from my 'main machine'. What I mean is, I don't know whether I'm opening an interface to the program that's already running or whether I'm opening an new instance of the program. I've got tmux installed on the main machine. Thanks for the help guys. Any further thoughts would be welcome.
|
|
Peter Hull
Member #1,136
March 2001
|
Almost there I csan feel it in my bones! The next step is going to be tmux/screen so you can start a job and detach. Thomas is the expert there, I've never done it.
|
|
|
1
2
|
Probably want to start that program inside of tmux or screen, so you can log out and it'll keep running.
