Networking :: SSH From Internal Network

Oct 6, 2009

I am not too knowledgeable on networks, however I think this should be possible.I have a computer at work, which is connected to the work network. I have files stored on the central server here and also my local computer.

At this place, computer support say "We do not offer this service". However they also say "The simplest way to do what you are asking is to install an ssh server on your actual workstation".I have done this, and it the openssh server is working because I can test from my workstation by doing ssh user@hostname and it works.What I want to do however, is to connect from outside the network. Firstly, is this possible, and secondly, what is the syntax for ssh in order to do it.

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Networking :: Cannot Ping Internal Network

Jan 28, 2009

cannot ping internal network

I am a new user to Linux but in the last couple of months gained some Idea about it,I am trying to set up a small network in my office having 3 windows xp PCs, two fedora10 PCsI have an adsl router with 4-port hub connecting to the internet, one switch (say sw1) and one linux PC (say linux1) is connected directly to the router, the three win xp PCs are connected to switch sw1.all the above is working fine, I am able to get connected to Internet In all the systems, and able to network among all the above four.Now I want to make the linux1 as a proxy server for, hence I added another network card into it connected it to another switch sw2, which is connected to another linux pc (say linux2).

I have tried a hundred things, and googled an equal no. and finally posting it here.In order to reduce confusion I have disabled DHCP in all machines, and given static ips insteadNetworkManager was not happy about it, hence to fix my static IP i disabled NetworkManager ('chkconfig NetworkManager off')

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Networking :: Can't Connect To Internal Network

May 11, 2009

I did a new install of Kubuntu 9.04. I use static ip addresses. In an attempt to resolve the issue with the network manger in 9.04, I removed the network manager. I am now able to set the ip addresses just fine and I get to the internet. However, for some reason, I can't get to my internal router. Has anybody encountered this or have a suggestion on what I may try?

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Networking :: Can't Access Websites From Internal Network

Aug 28, 2010

I am in the process of setting up my own Linux gateway/firewall using two nics eth0(external network) and eth1(internal network). The Linux gateway hands out ip addresses using dhcp3-server, and uses iptables to route the traffic correctly. Clients are able to connect and access the internet...everything is working great, HOWEVER I can't access my apache virtual hosts websites from the internal network? They work just fine if i access them from the outside world

I can type ip of the web server, and it shows the first virtual host listed in my /sites-enables/000-default folder. but i can't use any DNS entries. I don't have any internal DNS servers running. This doesn't makes sense, because if i replace the linux firewall/router with my normal linksys wrt54G router it works just fine.

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Networking :: Port Redirection To Internal Network NAS Box

Jan 17, 2011

I'm have a base level understand of linux at this point. I have Debian box that I am trying to do some port redirection with.

I have my external NIC as eth0 with an IP of x.x.250.5.
I have my internal NIC as eth1 with an IP of

On the internal network I have a NAS box with a web interface at What I need is to set it up so that a request to x.x.250.5:8080 will some how forward/redirect to the internal network NAS box at

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Networking :: Port Forwarding Within Internal Network

Feb 26, 2010

I have a question about port forwarding. I have an internal Red Hat server and I would like to use it as a central connection point to some back end servers. This is not an internet router setup. I was thinking I could use iptables and do port forwarding similar to an internet router but internal to internal.
Basically I would like to take any connections to port 22 on server1 interface eth0 and forward them out of interface eth1 to server2 port 22.I am finding a lot of information on port forwarding, but it is all based on using an internet router that is passing through to an internal server. I need to know how to configure a basic linux setup with no existing iptables entries so that I can do this within an existing network.Also, if there is a better or easier approach I would appreciate any direction. I don't want to do this through an SSH tunnel.I know to start I need the following to enable forwarding in the kernel and a firewall PREROUTING rule.

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Networking :: Multiple Network Connections - Internal And Wireless

Dec 4, 2008

What I want is quite simple, I have my PC running Linux Mint 5 (Elyssa), and I would like to connect it to both an internal network, which has a file/print server, another machine and will soon host a small cluster. I also have a wireless router connected to the tinterweb.

The thing is using my ethernet I want to connect to the internal network whilst simultaneously using my wireless to deal with the internet, I want to keep the internal network off the net as it really doesn't need to be connected. I can connect to my internal quite happily and also my wireless but not both at once.

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Networking :: Preventing Internal Network Traffic With Firewall

Jul 3, 2010

Does anyone know if it is possible to filter/block network traffic between internal hosts on a lan?

Eg. : Linux firewall/router ( - LAN Default G/W - all internal > external traffic gets filtered.

How would you filter tcp/ICMP/UDP traffic from internal host a ( ) to host b (

All the internal hosts have the linux f/w as the default gateway, and are all on the same /24 subnet.

I would like to know if I can filter traffic between internal hosts.

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Ubuntu Networking :: Internal Network Doesn't Seem To Be Loading Driver

Feb 27, 2010

I just recently installed a fresh copy of 9.10 server on an older machine I had laying around to use as a router and home server. Everything is setup and I'm on the net on it, except for some reason the Netgear GA311 I'm using for the internal network doesn't seem to be loading a driver. I've tried modprobing 8139 (which it says isn't found) as well as 8139too, 8139 too goes through ok, but it doesn't make any change, with lshw still claiming that it is "unclaimed". It seems that the Realtek chipset this card is based on is extremely compatible with Linux and I'm having trouble finding anyone with a similar issue with it.

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Ubuntu Networking :: Ping Fails On A Single Pc In Internal Network?

Jun 1, 2010

I want to ssh to a pc in our home network. It is a standard network in terms of a DSL router, dynamic IPs via DHCP, WPA2/PSK security, wireless network connection for all pcs except one which is wired to the router.I got the error "no route to host" from ssh. Openssh-server was already installed. It turned out later that the laptop I want to ssh to (namely the one which is connected by cable) cannot be pinged by any other laptop on the network.

The pc in question (lucid lynx with most recent updates) is online, can ping itself and the router, but cannot ping others in the network and cannot be pinged by them. I suspect a firewall setting of being the problem.

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Ubuntu Networking :: Static Route For A Nested Internal Network?

Jul 13, 2010

I'm using ubuntu server 10.04. I need to create a second network to do some testing. Here's what it looks like so far: WAN > x.x.x.x/9 > router > > LAN

I need to do this: WAN > x.x.x.x/9 > router > > LAN > ubuntu server (LAMP, dhcp, dns via eth1) [eth0] > ubuntu server [eth1] The two networks should be transparent to one another. I've got everything working, except routing. Here is ifconfig:


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Networking :: Port Forwarding In Bittorrent Client In Internal Network With Nat

Apr 9, 2010

I have an internal network behind a server <> connected to the internet that NATs my ip <> only. NAT is not allowed to any other ip addresses. When I use Transmission Bittorrent client to download torrents, The thing is that this is not my machine and doesn't have access to the internet at all. What is happening here? Can anyone help me?

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CentOS 5 Networking :: Open The Firewall To Internal Network Card?

Jul 28, 2010

I have just installed CentOS and it is working fine!I made a masquerade with the document there: I didn't used the script, because right now, I do not completely understand it, and obviously I am not modifying anything by leaving it like that.I was using Mandriva before and I am used to graphical tools My questions are:I add the following lines in my iptables:

[root@localhost ~]# service iptables stop
[root@localhost ~]# iptables -t nat -A POSTROUTING -o eth1 -j MASQUERADE
[root@localhost ~]# service iptables save


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CentOS 5 Networking :: Public Subnet Is Not Accessible From The Internal Network

Aug 6, 2010

I will try to explain a bit first about my network typology: I have one cent os 5.5 machine with 2 nics - external one 86.x.x.122 and internal one with 2 IPs: and 89.x.x.121. The ideea is that I have a public subnet (86.x.x.120/29) of IPs which are routable only through 86.x.x.122 so I have a webserver hosted on a different machine with the IP of 89.x.x.122 and GW 89.x.x.121 - everything works perfectly fine, except that I cannot access from the internal network / 24 the so called DMZ (roughly) - the 89.x.x.122.

What really makes me crazy is that I setup the IPtables rules correctly because I can access the webserver from the outside world but I cannot accessit from the internal network...

what I'm missing - why the cannot see the 89.x.x.122 machine... What IPtables rules should I add?

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Ubuntu Networking :: Internal Error Network Is Unreachable?

Aug 7, 2011

I am plagued by the following error when attempting port forwarded connections to my minecraft server. Port forwarding is good and test ok on router based firewall. No iptables entries. Natty N, all updates current.

[INFO] Disconnecting CascadianNW [/]: Failed to verify username! [internal error Network is unreachable] Network is unreachable

Some discussion indicate jvm network connection issues related to ipv6, but they are old posts.

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Fedora Networking :: Configuring IPv6 (network) Tunnelling - Getting Only Internal Addresses From DHCP

Aug 25, 2011

I am trying to configure my IPv6 network. My computers are behind a Fedora gateway IPv6-configured, which is working great. But for computers inside my network, it seems I am getting only internal addresses from DHCP. Here is my ifconfig for an internal computer:

Quote: em1 Link encap:Ethernet HWaddr F4:6D:04:34:92:2B inet addr: Bcast: Mask: inet6 addr: fe80::f66d:4ff:fe34:922b/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:744250 errors:0 dropped:0 overruns:0 frame:0 TX packets:548987 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:841392242 (802.4 MiB) TX ytes:60384500 (57.5 MiB) Interrupt:18 Memory:f7100000-f7120000

he-ipv6 Link encap:IPv6-in-IPv4 inet6 addr: 2001:470:1c:611::3/64 Scope:Global inet6 addr: fe80::cea7:b778/128 Scope:Link UP POINTOPOINT RUNNING NOARP MTU:1480 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:61 dropped:0 overruns:0 carrier:61 collisions:0 txqueuelen:0 RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)


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Networking :: Creating Domain Name In Bind Exposing Bind To Internal Network

Sep 3, 2009

I am configuring bind9 on fedora 9(sulphur).I have configured /etc/named.conf and created zone file in /var/named/I have started the service but when I am executing the command nslookup it is not able to resolve the name.Another problem I am facing when I do telnet localhost 53,I am able to connect.but when I do telnet myip 53 it does not connect.Seems to be a firewall problem but I ve disabled iptables selinux completely even I ve disabled dnsmasq but still not working.

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Ubuntu Servers :: Two Network Cards / Can't Access Internal Network

Feb 25, 2011

I've installed Ubuntu Server 10.10 with two network cards. One for external, and one internal.My problem is that as soon as i activate eth1 (external), i can't access the server from the internal network (eth0)

With these settings i can't reach the internal network from inside.If i disable the gateway on eth1 and enable the gateway on eth0, it works.

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Red Hat / Fedora :: Virtual Box Internal Network

Apr 29, 2011

I decided to write in this section because my guest OS on VirtualBox is Fedora, and I need to configuring the internal network in order to communicate with another guest running Mandriva (actually I don't succeed in configuring the network on Mandriva too). I configured VirtualBox (host OS is Ubuntu) from the graphical interface as follows: Linux Fedora (VM) -> Settings -> Network -> Board 2 (the first is used with NAT) ->

When I run Fedora now I can see two network interfaces (eth0 e eth1): the first connect Fedora to Ubuntu, the second should be my internal network (right?! I'm not sure about this). DHCP server doesn't seem to work, and I don't know how I can configure the network in a static way..

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OpenSUSE Network :: SSH Working For External But Not Internal?

Jan 14, 2010

I have a SuSE server (sorry but no idea what version of SuSe it's running.. I'd take a guess at 10.0) on a network with several other SuSE servers. They are all able to be SSHed externally as well as internally and all have their local firewalls disabled. I just had to reboot one of the servers and it is behaving quite strangely. I am able to SSH in and out of it externally, but can't SSH in and out of it internally.

When trying to SSH out internally I get the message:
"ssh: connect to host *.*.*.* port 22: No route to host"
When trying to SSH in internally I get the message:
"ssh: connect to host *.*.*.* port 22: Connection timed out"
Using ssh -v doesn't give any more useful information.

I have double checked that the IP is correct and that the internal firewall is disabled etc. The external firewall hasn't got anything that would prevent it (and shouldn't be an issue anyway as it's an internal only problem... SSH externally works fine). Also, it might help to know that I have the same problem with ping. I can ping this server from an external system, but not from an internal one.

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OpenSUSE Network :: Lock A Certain Website For Internal Users?

Aug 4, 2010

I have a firewall/router box running openSUSE 11.2 between the outside world and the LAN. This router also provides DNS for the LAN and has SuSEfirewall enabled. LAN users need (almost) full access to the internet. However, I want to block certain sites which are not required for work (you name it: facebook is my candidate). What is the most elegant way to block certain sites (which have quite a lot of different IP numbers) ?

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Ubuntu Servers :: Setting Up Secure FTP On Internal Network

Mar 8, 2010

I'm running Ubuntu Server 9.10 and I'm looking to setup an FTP server. I have SSH running beautifully and it's accessible from any computer whether it be inside the network or coming in from the internet (provided you have the administrator username and password ). I've tried Proftpd and vsftpd and have failed miserably so far. Which FTP server application do you think I should go with and how could I go about setting it up through my SSH connection?

My current setup is this:
- Ubuntu Server 9.10 with Fixed IP of
- 500GB Hard Drive
- SDA1 = 512MB ext2 /boot
- SDA2 = 2GB swap
- SDA3 = 20GB ext4 /
- SDA5 = 438GB ext4 /home
- One User (Username = administrator)
- Full SSH Capabilities
- IP Address to DNS provided by
- WRT120N Router with Remote Access and Port 22 Open

I basically want to set up a secure FTP server that anyone on the internal network can access as well as anyone from the internet (as long as they have a username and password). I want to setup a username and password for each user so that they all have read/write access to the same folder in my /home partition (I'll call it FTPSHARE).

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Fedora Servers :: Internal Mail Service Setup With 7 PCs On Network?

Jul 27, 2010

I've 7 PC's on my network. I've to setup an internal mail service, to send mails inside the network. I've installed Fedora 12 on one machine and the rest run's on Windows XP. What all packages do I need? How can I configure it?

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OpenSUSE Network :: OpenSSH Chroot Only Supports Internal-sftp?

Nov 16, 2009

Had my chroot jail all set up and working nicely in OpenSUSE 11.1, upgraded to OpenSUSE 11.2 and had to set:

Subsystem sftp internal-sftp
(which was:
Subsystem sftp /usr/lib64/ssh/sftp-server)
ForceCommand internal-sftp


Of which with-pam is mandatory. I used prefix to put the binaries in a place that would not conflict with the standard distribution, this meant I also needed to change /etc/init.d/sshd so that it referenced the newly compiled version of sshd, and copy /etc/ssh/sshd_config to /opt/etc/sshd_config.

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OpenSUSE Network :: DHCP - Internal Computers Connect To The Internet?

Nov 23, 2010

I set up a server that has dhcp going. This works 100% as I get ipaddresses. My question is how do these internal computers connect to the internet? There is a proxy that needs to be passed as well...

Is this just a simple case of portforwarding or is this a completely different thing?

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General :: Access Internal Network Virtual Hosts In Apache?

Mar 6, 2011

I currently have an Apache Web Server running on Ubuntu 10.4 and I use a DynDNS service to make them accessible to the outside world via a domain and/or subdomain.

My configs currently look like this:

<VirtualHost *:80>
ServerAdmin <obscured>@<obscured>.com
ServerName <subdomain>.<obscured>.com
ServerAlias <subdomain>


This works fine from access outside of the network and all subdomains resolve to the correct directory.

The problem I am having is with accessing a subdomain over my internal network.

I can access the Web Server using the server's IP address: but this always takes me to the same virtual host and I don't know how to distinguish between different virtual hosts (different subdomains).

Ideally I would like to access the same subdomains using http://<subdomain>/ where <subdomain> is the same as the subdomain attached to the external domain name.

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Programming :: Faking IP Addresses To Test Servers On Internal Network

Jun 9, 2009

I'm in the process of setting up a script in perl to make 1,000's of curl calls to my companies application on our test server. Our software does all sorts of tracking of data based on IP addresses using geoIP, so i was wondering if anyone knew of a way to fake these addresses to the server?I know a big issue with the IP faking is the return path but i dont really need this. I also cant do it on the hardware level since the script is going to be picking lots of different IP's at random.Anyone have any idea if this is possible and if so, are there any known libraries i can use for this? I prefer perl but any Linux compatiblie scripting language is fine.

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General :: Send Cookies / Site Login Information Over Internal Network?

Aug 23, 2011

Is there a way I can send cookies/site login information to computers within my internal network? i.e push them through in packet headers? Not FTP. For example if I want to send cookies with my shopping cart or login information from one computer to another within my network how can I accomplish this?

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Ubuntu Servers :: Unable To Configure PostGreSQL For Internal Network Access?

Jan 9, 2010

I have a problem configuring my PostGreSQL server for internal network access.

I want to be able to access my postgre server from

It works when I set listen_address to *, but if I input, or any other IP address, I always get:


WARNING: could not create listen socket for ""
FATAL: could not create any TCP/IP sockets
postgresql.conf section


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Programming :: Apache Mod_write/proxy - Bunch Of Web Servers Running On My Internal Network

Jan 26, 2011

Suppose I have a bunch of web servers running on my internal network:

And I have a dyndns account, I was wondering:

How can I do this?

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