iptables (NAT/PAT) setup for SSH & Samba

Posted by IanVaughan on Server Fault See other posts from Server Fault or by IanVaughan
Published on 2010-04-29T13:07:03Z Indexed on 2010/04/29 13:17 UTC
Read the original article Hit count: 513

Filed under:

ssh

|

samba

|

iptables

I need to access a Linux box via SSH & Samba that is hidden/connected behind another one.

Setup :-

  
 A        switch    B         C
|----|    |---|    |----|    |----|
|eth0|----|   |----|eth0|    |    |
|----|    |---|    |eth1|----|eth1|
                   |----|    |----|

Eg, SSH/Samba from A to C

How does one go about this?
I was thinking that it cannot be done via IP alone? Or can it?

Could B say "hi on eth0, if your looking for 192.168.0.2, its here on eth1"?
Is this NAT? This is a large private network, so what about if another PC has that IP?!

More likely it would be PAT?
A would say "hi 192.168.109.15:1234"
B would say "hi on eth0, traffic for port 1234 goes on here eth1"
How could that be done?

And would the SSH/Samba demons see the correct packet header info and work??

IP info :-

A - eth0 - 192.168.109.2
B - eth0 - 192.168.109.15
  - eth1 - 192.168.0.1
C - eth1 - 192.168.0.2

A, B & C are RHEL (RedHat) But Windows computers can be connected to the switch. I configured the 192.168.0.* IPs, they are changeable.

Any help?

© Server Fault or respective owner

Related posts about ssh

Problem with hadoop start-dfs.sh

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
I installed and configured hadoop on my Ubuntu 14.04 server, virtualized inside of hyper-v, however I am getting an issue when i run start-dfs.sh root@sUbuntu01:/var/log# start-dfs.sh 14/06/04 15:27:08 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java… >>> More
SSH problems (ssh_exchange_identification: read: Connection reset by peer)

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
I was running 11.10 and decided to do the full upgrade and come up to 12.04 after the update SSH (not SSHD) is now misbehaving when attempting to connect to other OpenSSH instances. I say OpenSSH as I am running a DropBear sshd on my router and I am able to connect to it. When attempting to connect… >>> More
SSH main process ended

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
I have a running ubuntu server 10.04.1. When I tried to login to the server via ssh, I could not. Instead, I got connection refused error. I tried to ping the machine and I got reply! So, the clear reason is that SSH daemon is stopped. After reboot, I was able to login to my server via ssh. After… >>> More
SSH server not working (respawns until stopped)

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
I have a running Ubuntu Server 10.04.1. When I tried to login to the server via ssh, I could not. Instead, I got connection refused error. I tried to ping the machine and I got reply! So, the clear reason is that SSH daemon is stopped. After reboot, I was able to login to my server via ssh. After… >>> More
Cannot SSH after resetting firewall on VPS

as seen on Server Fault - Search for 'Server Fault'
I'm having trouble trying to SSH to my Debian 5 VPS with blacknight. It was working fine until I did the following: Logged into 'Parallels Infrastructure Manager' - Container - Firewall - Set to 'Normal Firewall settings'. It told me there was an error with the IPTables and offered the option again… >>> More

Related posts about samba

Unable to connect to Samba printer

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
I have a headless Ubuntu 12.04 server for files and printers. It shares files via Samba just fine. However, the HP PSC-750xi connected to the server via USB is not accessible from my Ubuntu 12.04 laptop. I can browse for it in the Printing control panel, but any attempt to authenticate my ID to the… >>> More
Samba folder is gone

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
I seem to have some issues sharing folders from my Ubuntu 12.04 machine to a Win7 machine. After playing around with the settings, I decided to revert to Samba's original setting by reinstalling it: sudo apt-get purge samba sudo rm -rf /etc/samba/ /etc/default/samba sudo apt-get install samba just… >>> More
Samba on OS X 10.6.4

as seen on Server Fault - Search for 'Server Fault'
I just updated from 10.6.3 to 10.6.4, and now my Samba shares won't mount and won't allow access into the directories. In the logs, I've started to get the following errors, any idea what might have gone wrong? 2010/06/25 15:54:27, 0, pid=13848] /SourceCache/samba/samba-235.4/samba/source/passdb/secrets… >>> More
OpenLDAP and Samba, can't log onto Samba share from Windows

as seen on Server Fault - Search for 'Server Fault'
The former jackass IT-guy that I'm taking over for had a Samba share setup on a Fedora server that uses our OpenLDAP server to authenticate users who want to log in from Windows. We recently added a new employee and I jumped through the LDAP hoops to add them to the system. However, I can't seem… >>> More
Windows 7 Samba issue

as seen on Server Fault - Search for 'Server Fault'
We have a strange samba issue affecting only one user. Our samba setup is as follow : Red Hat Enterprise Linux Server release 5.4 (Tikanga) - Samba Server Samba version 3.0.33-3.14.el5 - Samba version Domain Controller WIN2008R2 Standard -… >>> More