Ubuntu :: SSH Into Machine Without External IP?
Mar 8, 2011
I have two machines sitting in different offices.
Machine A is an ubuntu server box which does not have an external IP address, but is connected to the internet.
Machine B is an ubuntu server box which does have an external IP address (and is connected to the internet).
As it stands, machine B cannot ssh into machine A, only the other way around. What I was wondering is is it possible for machine A to setup some sort of tunnel which machine B can then use to connect back to machine A? I only need SSH access, and I only need it from Machine B to Machine A.
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Mar 22, 2011
I've got the following two subnets.
Code:
Subnet 1: 10.1.0.0/24
Subnet 2: 172.16.0.0/24
A machine in subnet 1 is natted to a static address in subnet 2. For instance 10.1.0.10 is natted to 172.16.0.10.
I have achieved this with the following iptables rule. (in addition to enabling forwarding)
Code:
iptables -t nat -A POSTROUTING -s 10.1.0.10 -j SNAT --to 172.16.0.10
So far this works perfectly. What I want to do now is to add another rule that only nats the machine in case it is NOT accessing subnet 1.
In other words, when this machine accesses any other machine in subnet 1, it should show up as 10.1.0.10. Whenever it accesses subnet 2 of anything else, it should appear as 172.16.0.10.
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Jun 4, 2010
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Sep 1, 2011
I have an apache server running on my ubuntu machine. I can view them using my local ip (192.168.1.6):80/. And my friends can view the things hosted on my server using my external ip (example http://123.123.123.123:80) but when a friend links back to me to show me what they are looking at and share the moment, I can't view the link, it simply redirects to my router login page.
I had an older linksys router and this could work fine. I could click on the links with my external IP and it routes back to my server for viewing.
Remember to note that I am on the machine that has the server, and I'd like to be redirected out and back to it so we can share pictures back and fourth without me having to replace the external IP address with my local one just to view that link in the browser.
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[Code]...
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Jul 14, 2009
Have done a bit of Googling around this but got totally swamped so will try here. Basically we are running a CentOS server which hosts a number of virtual hosts under Apache. Recently I needed to set up a development environment for another site using Ubuntu and have this running and accessible on the LAN from a VMWare image. I'm using bridged networking so the VMWare machine has its own IP on the LAN subnet.
I've set up a DNS to point to the external IP of the physical host but can't figure out how to route traffic requested on this domain to the VMWare host. I've basically tried two approaches (configuring a proxy web server and reverse proxy in an httpd.conf file and mucking around with iptables forwarding rules but without success.
Ideally I'd like somesite.somewhere.com to point to the VMWare IP but I could live with a custom port on the end if thats whats required.
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Jan 22, 2011
I have a really weird one. This may be a putty issue, or it may be a config issue in Ubuntu. I've no idea who to blame. I have four machines involved in my little issue that has me scratching my head on where to even BEGIN to diagnose what is going on. The computer I'm attempting to connect to (For identification purposes, I'll call it the main machine) is running a relatively new install of KUbuntu 10.04, stock install of openssh daemon. ufw is disabled, firewalls are off, etc, and I can prove that later.
The machine acting odd is a Win XP 32 bit running Putty. Haven't had a problem until this reload of the previously mentioned machine. A Work machine that is running RedHad of some flavour. A Virtual Machine running a headless setup of Ubunto 8.04. Now that the introductions are over, here is a quick map of the machines that can successfully connect with. My major problem is that I cannot get SSH (And ONLY SSH) to work between the XP machine and the main machine.
Work -> Main = Works
Work -> VM = Works
XP -> VM = Works
XP -> Main = Fails
XP -> VM -> Main = Works
Main -> Main = Works (IE: "ssh localhost")
VM -> Main = Works
When I try to get the XP machine to connect to the Main machine, I get an error with Putty saying:
"Server sent disconnect message
type 2(protocol error):
baad service request ssh-connection"
I've changed Putty to try using SSH Protocol 1 only, but it says the protocol isn't installed on the Main machine, which is true. I've tried setting just 1, and it gives me the error, and I've tried setting it to "2 only" and it again comes up with the error. I went into /var/log as root on the Main machine, and did a "tail -n0 -f *" and then tried to connect, but nothing relevant shows up.
As for the proof that the firewall is disabled, three of the machines are working with Synergy, I am able to swap between all three of the machines without a problem, I can get to WebAdmin from the XP machine to the Main machine, and I can open a Samba share from the XP machine to the Main machine without a problem. This sounds like a protocol issue, but I can't see anything in WebAdmin that'll put me in the right direction.
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Feb 20, 2011
I have an issue with the manner in which Network Manager is configuring the network and short of ditching Network Manager I can see no solution.The issue : Getting a machine to update its machine name in the DNS serverSounds simple doesn't it I operate a FreeBSD based firewall / DHCP / DNS server, using a default Network Manager DHCP configuration the Fedora clients do not register their names with the DNS server when they obtain an address.
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