General :: Setup Nat Router To Two Private Networks
Feb 8, 2010
set up a redhat nat router for a classroom we have out main network is 192.168.110.0/24 and we ran out of ip address for all the school computers so i added a nat router to a large classroom with a network address of 192.168.116.0/24 almost everything is working fine except a connection to the ads server with a program called medisoft im guessing my nat is blocking it how can i open up all ports to and from my 192.168.116.0/24 network as it doesnt need any protection
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Jan 11, 2011
I have one doubt that is how can we actually connect a system in private network with the system in a public network using IP address. I have one system in private network (in my campus) I need to connect it with the system on public network (home) using IP address and communicate with each other. How can I do it or is there any other way of connecting these two systems more easily?
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Apr 24, 2010
I'm having trouble getting my network set up the way that I want it/had it. You see, when I first set up my network, I just had my cable modem going directly to my standard wired router (A D-Link DI-604), which had DHCP,and was connected to all of the computers on my network. I had one switch hooked up to one of the ports of the router, but this was a regular switch, and it would not try to assign IP addresses, it would just pass through the DHCP info as I wanted.
Now however, my network setup has changed. My room mate and I both got laptops, and we decided that we wanted to have wireless access so we didn't have to constantly plug in to the router.
Now my network is set up like this: The modem is hooked up to the router(DI-604), which is hooked up on the LAN side to our computers, our switch (which is hooked up to 3 more computers), and to a wireless router card (A Gigabyte GN-BC01).
The wireless router card has two jacks for ethernet. One for WAN, and one for LAN. The LAN side we have plugged only into the computer in which the card is installed.
Now the problem is this: The wireless router card comes with DHCP by default, and it's assigning addresses to the laptops and to the computer hat it's in, and worse, the IP addresses are on a different subnet than that of the main dlink router. The Main (dlink) router assigns addresses from 192.168.0.1 (itself) to 192.168.0.254, while the wireless router card assigns addresses from 192.168.1.1 to 192.168.1.254 (itself).
Because of this, I cannot access services on the wireless network from my wired network or vice versa. The first thing I tried was setting the card to assign addresses from 192.168.0.12 to 192.168.0.253, however it just said "internal error" when I tried to do this. I decided that this may be because it sees that it was being assigned an address on it's WAN side on the same subnet. So the next thing I tried was disabling DHCP and setting the "LAN IP Address" to 192.168.0.12, hoping that the DHCP would just go through the card, like a switch. I would have set the LAN IP address to be assigned by DHCP, but this was not an option, so I decided that'd be the best thing to set it to.
Once again however, setting the LAN ip address to an address on the same subnet as that of the IP assigned to it's WAN side caused it to report an "internal error". I verified that this was the issue by setting the LAN address to several other private IP addresses to test (I.E. 10.0.0.1, 192.168.3.1, 192.168.5.12).
My question then really is: How do I set up both routers so that I can access services and computers from each network from the other network. Should I set them with different subnets and set the gateway on the wireless network to the main router? To the wireless router card? Should I put them on the same subnet? Will it know how to communicate?
Here is a link to (picture) my network diagram. Network Diagram
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Jan 12, 2010
i followed this guide, [URL] a few days ago and set up an sftp server no problem. The user can only see what is in there home folder which is only the examples file which is empty. Today i went to set up a 2nd ftp account for my own private use. I have it set up and all, followed exactly what he said the 2nd time around and my 2nd user is not chroot'd. I can explor the contents of the whole drive.
My fist user that works fine is "ftpuser" and the group is "sftponly" just like in the guide. My 2nd user is named "ftptaylor". Now i did have an ftp server set up with vsftpd where i had the same ftpuser account in a different group, but it was jailed to /home/ftpuser. I cant tell you how i did it, i followed a number of guides untill one worked. But could it be that the guide above does not in face jail the users, but just that my user was already jail'd?
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May 7, 2010
After years with Linux and using ssh on a daily basis I have to admit I've never setup public/private key authentication and I've never run passwordless logon to ssh. It's not that I've never tried, I have - I've just never got it working. That to me is an almost alien concept as I am a tinkerer at heart and rarely stop until something is working the way I'd like it to. I get the principle of what's going on but I've always had a mental block about it.
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May 13, 2010
I've just finished installed a mail server with Fedora 12 + postfix + courier. I also have Squirrelmail and ISPConfig3 installed. The mail server is behind a router. I have [URL] pointed to the static IP at my router. My ISP has opened port 25 & 110 for me and my router has these 2 ports forwarded to my mail server (192.168.0.100).Workstations in local network can connect to my mail server and send emails with no problem but cannot receive emails from outside. I tried an email dossier and it saids connection timed out on smtp session. Do I need to include my static IP somewhere in the configuration so that it communicates to the world properly?
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Nov 19, 2010
A server is acting as a router between two networks. If the load increases what happens, to the speed of network? whether the network speed will be reduced or it will sustain the same speed (Ex: 100MBps).
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Jan 26, 2010
I installed OpenSSH via tasksel and am using Webmin for administration. I'd like to be able to SSH externally and want to setup the necessary public/private keys to use in FileZilla. In Webmin, under Servers > SSH Server I can click 'Host Keys' and see an RSA key. Is this the public or private key for my server? Do I need to copy this into a text file to import it into FileZilla on my remote PC (that I want to connect from)? Is that all that needs to be done (aside from opening the port on my router/firewall)? Or, is there an automated way to set this up via Webmin?
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Feb 4, 2010
I'm currently running Koala on a Dell Latitude D630. I've been with Ubuntu since Hardy, so I have some experience, but this is beyond me. Basically, I was at school, closed my laptop, and bicycled home. When I opened it up at home, I saw a blank screen. When I tried to reboot, I was told that the disk couldn't be mounted. When I boot a LiveCD, I can see my two disk partitions (/ and /home) as "16GB Filesystem" and "95GB Filesystem". The 16GB system can't be mounted, and I'm pretty sure is fragged. I tried reinstalling Ubuntu, figuring that would fix it, but no luck- it starts fine, but it gets about halfway through and then says it can't install the files.
The machine is still under a service contract with Dell, so swapping out the HD itself isn't such a big deal. It would be nice to get my data, though. I can successfully mount the 95GB (/home) system. I then see two folders "dan/" and "lost+found/". I can't enter the "dan" folder because I don't have permission. Opening a terminal and navigating to /media/95GB Filestystem/dan/ works if I "sudo su root" first, but not as "ubuntu" In the dan/ folder, all I see is "Access-your-private-data.desktop" (because my /home directory is encrypted) and "README.txt". The README says to run the command "encryptfs-mount-private".
When I do that, however, I just get the message ERROR: Encrypted private directory is not setup properly I tried putting my decryption password immediately after the decrypt command, a la: encryptfs-mount-private mypasswordgoeshere but with no change in results. The one ray of sunshine in all this is that I backup my /home directory to an external every week or two. So the actual data loss is not catastrophic. But it *has* been a busy week, so I would really like to recoup that data, since it includes little things like the first chapter of my dissertation, and the job negotiation emails in my .evolution folder.
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Apr 19, 2011
I have just installed fedora 14 and would like to setup my linksys wag54g router in order for me to connect to the internet. I'm the newest newbie ti linux been spoiled rotten by the ease of installing stuff on win7. I need a step by step how to please as I am completely new to the command line as well. I have uploade the quick install guide for the router, but at this stage I dont know wether I should go ahead with what the install guide says or not as I dont know what works for linux.
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Sep 17, 2010
I just installed ecryptfs (debian Lenny). However, when I try to run it (as normal user), I get the following
$ ecryptfs-setup-private Enter your login passphrase: And it wont accept any password (naturally since this is the first time I'm running it).
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Aug 17, 2010
i've set up a little mail server ob my private server, using getmail to get the mails from different pop accounts and to send it to maildirs of some virtual users, and i use dovecot as imap server to provide the mails to my clients which are mostly outook 2007. i run getmail as a cronjob which fetches my mails every 2 minutes, anyhow i'd like to run it on demand when a client pushes the send/receive button. is there a way to tell dovecot to run getmail on demand?
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Dec 10, 2010
Long story short: I opted to encrypt my home, enter the passphrase and soon as I log out and rebooted, I got stuck with a message about /var/lib/ICEauthority file and other messages. So I've been trying to fix one issue at the time. The bottom line is that I'm trying to get to my private folder. Dropped in recovery mode:
[Code]...
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May 15, 2011
a friend of mine is doing a small website-project in school (group of ~6 people). They want to use git as VCS and need acces to a server. I have an account on the server from university, but - of course - no root access.
I could create private/public keys for them, to SSH into my account, but I don't want them to have this power I found 'git-shell', which seems to be used for restricted access with git (although I'm not sure whether I understood the functionality).
My question is: Is it possible to configure SSH keys in that way, that the server runs them (and only them) in git-shell in a specified directory (using ~/.ssh/{config,authorized_keys})?
So that they can
- log in with their SSH key
- use git, execute scripts etc.
- use git push/pull from their private+school PC
- work only in a specific directory (like chroot) eg. ~/web-project/
[Code]...
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May 24, 2010
I just set up my Twitter account on the Gwibber social client.However Gwibber rather than showing tweets,shows only my Private Messages no matter which column i select. I tried doing a re-setup but that did'nt work.
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Aug 18, 2010
i noticed that all files can be seen by another computer if the drive is accessed
can I stop this? can i set a private folder?
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Apr 12, 2011
I am a (somewhat) newbie to Linux (but have an extensive Windows background), and I have just installed Debian Squeeze in an old EeePc 701 4G using the netinst version only with the following packages:
eeepc-acpi-scripts
x-window-manager
gnome-session
gdm
gnome-themes
gnome-themes-extra
plymouth
bridge-utils
Now I would like to install Debian in my main laptop, but I think it won't be able to connect to any wireless networks during setup and before installing firmware-brcm80211 and wireless-tools (its wireless card is a Broadcom 43224AG). That being, and to avoid connecting the computer directly to the router (it is not easy), I would like to bridge the EeePc's wireless connection to my laptop using a cable. I tried using the instructions found at the Debian Wiki, but I couldn't set it up properly.
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Mar 15, 2011
I'm trying to setup a OpenVpn on my Ubuntu 10.04 and after doing the configs from here: [URL] I get an error:
[Code]....
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Apr 10, 2011
Is it possible to set up a (Open)VPN server without havning the server behind a router (NAT)?
My ISP allows me to have multiple IP addresses (assigned by DHCP).
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Sep 8, 2010
I would like to setup a Linux Router with Fedora. Here is what I have and would like to do...
Email filter device is on the LAN at 192.168.x.3. I need to provide SNAT to that device from both T1 interfaces...
All outgoing traffic will route through DSL except for traffic destined for addresses on either eth0 or eth1 (web sites).
I assume I would need the following:
I also assume I would need to setup iptables with FORWARDs for the 192.x.x.x networks to eth3.
What I am not sure how to do, is properly setup the incoming redirections so that the email filter can be access from both eth0 and eth1 by different IP addresses.
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Apr 5, 2010
how to setup ubuntu as router. i already try to setup but it doesn't work.
my situation is to create ubuntu as router. i have two network card etho and eth1. i want to create eth0 in DMZ and eth1 only can only access in internal.
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Apr 3, 2011
I have multiple devices in my garage that need internet connectivity. I have my main Netgear router inside the house. I have a computer running Ubuntu in the garage with dual NICs.
Here's a map of how I have it setup now: [URL]
Here's my /etc/network/interfaces:
Code:
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet static
address 192.168.1.60
netmask 255.255.255.0
gateway 192.168.1.1
auto eth1
iface eth1 inet static
address 192.168.1.5
network 192.168.1.0
netmask 255.255.255.0
broadcast 192.168.1.255
I was trying to keep everything on the same subnet. Eth0 is the external NIC, connected to the router in the house. eth1 is the internet NIC, which would go out to the devices in the garage. Now, I know it would be easiest to just connect a switch up and run all the devices in the garage off that switch. But the switch I have is a 10/100, and my network in the house is gigabit, and I want the PC in the garage to have gigabit access... which is why I'm doing this dual NIC setup and using the PC as a router, then the other devices in the garage will be 10/100.
In addition, I used the shell script as described in this article: [URL] to setup iptables. I also uncommented the net.ipv4.ip_forward=1 line in /etc/sysctl.conf. What am I doing wrong here? None of the devices in the garage that I connect up to the Ubuntu PC are getting connectivity. None are getting a DHCP lease from the main router in the house. The Ubuntu PC itself has internet access just fine though.
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Feb 9, 2010
I want to setup a router with firewall on ubuntu box that will connect windows pcs one serving as outside source and one serving as inside target.
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Nov 17, 2010
I am planning to setup a home network with Ubuntu.the home network consists of ~3/4 computers; a mediaserver (reelbox) and 2 more PCs.Can I setup the server as a DSL router and get rid of my modem/router I have right now?
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Dec 1, 2010
I am trying to set up SSH so that I can edit files on a home server (linux). I know this question has been asked many times before, but none of the answers seem to apply to me.
Here's my setup. I have the modem connected to a switch (wired) that connects 2 PCs to the internet (one desktop, one server, both wired).
All of the threads I see that discuss static IPs seem to require that I set up a router. Is this necessary? Can I still transfer files through a switch?
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Feb 17, 2010
I am trying to get more control of my small office network. It consists of several windows workstations, a debian box, and a ZyXEL P-660HW-D1 router, Right now, the only way to reach the debian box from other computers is to type in its ip address.
The goal is to be able to reach the box by just typing ://debianBox into my browser, though ideally I want to set it up to be something like ://debianBox.officenet, and to also reach other people's computers by typing ://mattBox.officenet and ://fredBox.officenet
The Zyxel router has a LAN page with a DHCP Setup tab with fields setup like so In the past I was able to mange this using an Orange router, but now I have to use the ZyXel.
So I installed dnsmasq on the debianBox, but I do not know how to configure it to get the results. I want and still get internet fromthe Zyxel router.
In the etc/hosts file of the debian box I added 192.168.69.15 debianBox, and for testing on my windows machine I set the primary dns entry of the Ip4 connection to 192.168.69.15 as well, but typing ://debianBox in my browser still gives me not found.
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Sep 12, 2010
I want to connect to my office intranet without utilizing internet, there is aprox 210 ft distance and i cannot locate my N router's signal even when i installed the router outside of the building, the server is redhat enterprise, and want to share filehosting and internet with the office to cut down costs.
Office building with intranet>--------<210ft>----------my apartment
I am willing to invest some money in this setup but undecided how to extend the network, someone told me i can use a router in repeater mode but i cannot find any such router, my employer has allowed me to use the office network (so nice of him) but at my own setup.
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Mar 9, 2011
I am trying to setup a firewall using Centos 5.5. The machine has 2 NICs, one connecting to the ISP/Modem and the other connected to a DIR-655 wireless router. The nic is connecting to the internet port on the router.
I do not want DHCP on the Firewall machine but on the wireless router.
[ISP/Modem]<--->[machine eth0]<--->[machine eht1]<--->[DIR-655 internet port]
IP from ISP Dynamic 192.168.1.1 192.168.1.2
IP's on the DIR-655 LAN will be 124.168.0.0/24 network lets say.
I have setup routes on the eth0 192.168.0.0/24 and 124.168.0.0/24
and added 124.168.0.0/24 to eth1.
I can ping eth0 and eth1 but cannot ping 192.168.1.2.
this setup is not actually connected to the internet so I disabled iptables to try testing the ping and still no good.
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May 12, 2010
I've got an Ubuntu box set up as a router and wifi hotspot. I can access the internet and any website using this box. I can connect a laptop to my wifi access point, and connect to both the router box and the internet. I'm writing this message from it. If I access either hsbc Hong Kong internet banking or speedtest.net from my laptop I can't connect. Every other site I've tried is fine. What could be causing this? I don't know where to start. I've set up the firewall rules and routing tables, so I vaguely know what I'm doing... but clearly not enough to debug this issue.
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Jun 18, 2010
\How can i setup my computer (currently running Ubuntu 10.04 lts) into a router so that other laptop can have a wireless connection to it and be able to access the Internet?
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