Ubuntu Networking Help needed!

Chat about Linux in general

Ubuntu Networking Help needed!

Postby vdeane on Wed Feb 13, 2013 6:25 pm

In one of my college clubs we have a server running Ubuntu 10.04 for our email lists and website, and formerly, everything else. Until three hours ago, it was set up to serve as our router, which had the unfortunate side effect of making everything slower than dial-up. Because of this, I reconfigured the network cables to use our wireless router as the router; most of the network is OK with this, but the server does not like it at all. It has no network access and even trying to ping the router by IP address gives the error "Destination Host Unreachable". I have no idea how anything with respect to the network was configured, and no idea what the problem is. Can anyone help? I've been pulling my hair out and am out of ideas; I think I might have to reformat the hard drive and start from scratch.
vdeane
Level 1
Level 1
 
Posts: 49
Joined: Fri Dec 28, 2012 10:36 pm

Linux Mint is funded by ads and donations.
 

Re: Ubuntu Networking Help needed!

Postby vdeane on Thu Feb 14, 2013 11:16 pm

Anyone? I'm absolutely desperate for help and am in way over my head. I have since attempted to remove the DHCP/DNS server and iptables (I thought there was a firewall rule causing problems and couldn't figure out how to disable it), and now it won't boot. I get to the point where I should have a login prompt but instead I have a non-responsive blank screen. Please help... I can't figure out how to fix this other than re-install, which would leave us with 100% data loss (I can't mount the drive with a live CD for some reason - caja just says "cannot mount drive", so there's no possibility of data recovery), and I don't know how to how to set up certain things (such as automatically mounting the storage on our automation system, or telling apache to forward all traffic to a certain directory to a different computer). I'm in over my head, the person who set this server up won't return my emails, and these issues need to be fixed yesterday. We have no way of contacting our members without our email lists, for example. :cry:
vdeane
Level 1
Level 1
 
Posts: 49
Joined: Fri Dec 28, 2012 10:36 pm

Re: Ubuntu Networking Help needed!

Postby catweazel on Fri Feb 15, 2013 12:46 am

vdeane wrote:Anyone? I'm absolutely desperate

Perhaps you should try the Ubuntu forums rather than Mint forums. There's nothing in either of your posts that would indicate your MATE desktop is the cause of the issues.
Mint Testing Team & Mint Donor #3606
KDE 4.12.0, custom preemptive kernel 3.12.5,
Intel i7 4770K @ 4.7GHz, 16GB 2666MHz XMP,
4 Samsung 840 PRO 512GB SSDs in RAID0,
6TB HW RAID10, dual 24" Acer X243H,
Gigabyte nVidia GTX 680 Super Overclock
User avatar
catweazel
Level 7
Level 7
 
Posts: 1656
Joined: Fri Oct 12, 2012 9:44 pm

Re: Ubuntu Networking Help needed!

Postby vdeane on Fri Feb 15, 2013 7:56 pm

It'll be a shame to have to make an account there just for this oee issue. Maybe I'll create a WCKN account for future use...

I managed to mount the drives (LVM/RAID) but I'm not sure where to put the data. Many files require root, which means I can't copy them to my server with caja... can't connect to it as root, can't copy the files as a normal user.
vdeane
Level 1
Level 1
 
Posts: 49
Joined: Fri Dec 28, 2012 10:36 pm

Re: Ubuntu Networking Help needed!

Postby kwisher on Sat Feb 16, 2013 2:33 pm

Can you connect via SSH?
The instructions suggested Windows XP or better, so I installed Linux :)
User avatar
kwisher
Level 5
Level 5
 
Posts: 643
Joined: Wed Mar 05, 2008 12:54 pm
Location: Greentown, Indiana USA

Re: Ubuntu Networking Help needed!

Postby DrHu on Sat Feb 16, 2013 2:52 pm


Based on host unreachable, your ifconfig status may show your IP address for that workstation is not on the same network as the server/router
--if you need to investigate/diagnose the problem and no network/sys admin is available to help ?, then you can check various network setups to find out some additional info for your network..
http://www.comptechdoc.org/os/linux/use ... icnet.html
http://www.ibm.com/developerworks/libra ... index.html

Basically you have to
  • Check your routers web interlace and see the status of the network and devices (printers, client computers and any other resources (media streaming devices, email services etc..))
  • Check that the client (the computer you connect from ) see the router's gateway as being UP and active..
http://www.computerhope.com/issues/ch001062.htm
--that's a windows example, however the Linux one would be similar, just like a windows, apple or Linux desktop services or look will be similar
[windows: ipconfig, ping, netstat]
[linux: ifconfig, ping, netstat (netbios status using names)]

Your own research will get you more detailed or more specifically useful to you guides/youtube examples or howtos: looking will find them
--and yes the desktop has nothing to do with the network interface failure (host unreachable)
--the network service: router and your client network device has to be ready and running..
User avatar
DrHu
Level 17
Level 17
 
Posts: 7034
Joined: Wed Jun 17, 2009 8:20 pm

Re: Ubuntu Networking Help needed!

Postby vdeane on Sat Feb 16, 2013 3:47 pm

Re-installing ufw (if it got removed with iptables, I would have thought it would go back with iptables... guess not) got it to finish booting, and some work with /etc/hosts and /etc/network/interfaces got networking working. No ssh until I got networking up.
vdeane
Level 1
Level 1
 
Posts: 49
Joined: Fri Dec 28, 2012 10:36 pm

Re: Ubuntu Networking Help needed!

Postby kwisher on Sat Feb 16, 2013 4:47 pm

vdeane wrote:Re-installing ufw (if it got removed with iptables, I would have thought it would go back with iptables... guess not) got it to finish booting, and some work with /etc/hosts and /etc/network/interfaces got networking working. No ssh until I got networking up.

Better make a backup while it's working!!
The instructions suggested Windows XP or better, so I installed Linux :)
User avatar
kwisher
Level 5
Level 5
 
Posts: 643
Joined: Wed Mar 05, 2008 12:54 pm
Location: Greentown, Indiana USA

Re: Ubuntu Networking Help needed!

Postby vdeane on Sat Feb 16, 2013 4:58 pm

I actually made a backup before I got everything back... it was when I was getting the MySQL databases that I remembered the /var/log directory and found the ufw problem.
vdeane
Level 1
Level 1
 
Posts: 49
Joined: Fri Dec 28, 2012 10:36 pm

Linux Mint is funded by ads and donations.
 

Return to Chat about Linux

Who is online

Users browsing this forum: No registered users and 3 guests