Network address translation (NAT) is an network technique that allows that a public IP can be shared by many private hosts(machines).

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How change Gateway of subnet ( private network, Internal) on MAAS

Ubuntu : 16.04 MAAS: 2.0.0 beta 3 I need to change the gateway address of my subnet( private lAN,Internal which is 192.168.120.1) to ip address of my region/rack controller( internal ip ...
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MAAS 2.0 and Ubuntu 16.04 Node Enlist get connection error to Internet behind a NAT

OS: UBUNTU 16.04 MAAS : 2.0.0 beta 3 1 Node as region/rack controller 2 Nodes Nodes are behind proxy I defined NAT on my region/rack controller i defined proxy on MAAS GUI When nodes try to boot ...
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73 views

Accessing a LAMP webserver that's behind a Ubuntu VM acting as a firewall

I currently have two VM's set up in the following manner: /-----------------------\ /-----------------\ | Ubuntu VM | /---------------\ ...
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21 views

How can I ssh to a server after running sshuttle?

I ran sshuttle on a server to Nat all of it's traffic behind a proxy server, so in this way I can hide it's IP address. But the problem is that I can not SSH to the server, as SSH will be behind the ...
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36 views

Setting up NAT forwarding using iptables on ubuntu server 14.04

I have a server with 2 ethernet interfaces(em1 and em2). em1 is the internet facing interface(192.168.16.113) and em2 has a static address(10.1.1.100) connected to a switch. I have configured the ...
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26 views

DNAT redirecting to specifc port is not working

I want to redirect ssh by port using DNAT, and i do try to ssh it through the command > username@IP_ADDRESS:10003 and i got this message "ssh: Could not resolve hostname IP_ADDRESS:10003: Name or ...
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27 views

Is it possible to define a fallback gateway server?

I'm using iptables to implement forwarding on one server, that is support to forward traffic from an internal network to the internet (tutorial: http://www.revsys.com/writings/quicktips/nat.html) On ...
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77 views

configure iptables to redirect traffic to a specific IP address

I have just began using iptables. I have a server with a public ip address (A.A.A.A) wich is hosting a Virtual Machine (B.B.B.B) on local network. I want to redirect all inbound traffic on the port ...
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53 views

How to resolve multiple hosts inside a NAT firewall

My apologies if this has been asked before, but I can't seem to find a complete solution. I have a hosted sub-domain at no-ip.com with a wildcard DNS option enabled. On my end I have a firewall ...
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167 views

NAT port forwarding using iptable doesn't work

I have a server with Ubuntu Server and a Xubuntu virtual machine on it, virtualization software is virt-manager. Ubuntu Server IP: 172.16.63.140 Xubuntu Virtual Machine IP: 192.168.122.4 I can do ...
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63 views

How to perform NAT to DDNS provided ip address using iptables

I have a device connected to the internet via a 3G Cellular link. I can't get a valid static IP address for my connection due to the network operator rules. On the server side, the application which ...
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39 views

Monitoring tool for Ubuntu

I am running a Ubuntu server for NAT and DHCP services in my Office. What monitoring tool can be used to remotely monitor server performance, DHCP lease addresses, IP Lease statistics, monitor ...
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266 views

Ubuntu vmware workstation guest doesn't connect anymore after windows host update from 8 to 10

I'm using VMWare Workstation 11 to power a Ubuntu 15.04 virtual machine. My Host operating system was Windows 8 and the NAT connection from Ubunto to the Internet via my host system worked perfectly. ...
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81 views

Change virtual box ip from 10.2.x.x to 192.168.x.x

I have applications and xampp setup on virtual box with ubuntu 12. The ip address for virtual machine 192.168.x.x but after installing vmware ,ip change for virtual box to 10.2.x.x I want to change ...
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71 views

How To Name Resolve VirtualBox VMs Using NAT on a Windows Host?

I'm using Ubuntu on VirtualBox, I can SSH into it using Putty on my "Host Machine" with this command, after port forwarding. ssh -p2222 SomeUser@localhost Is there a way to register all my VMs IPs ...
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971 views

No Internet Access on VMs in NAT Network in VirtualBox

I have created a a NAT Network in VirtulBox 5 In Ubuntu 14.04 LTS with following settings Natework Name : NatNetwrok1 Network CIDR: 10.0.2.0/24 Support DHCP :enabled Support IPv6 :disabled without ...
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100 views

How ntopng connects to nprobe server behind NAT

I have nprobe installed and running in a machine which is behind a NAT (let us say PAT). The ntopng is located outside NAT and we know that ntopng is the client which opens ZMQ connection to nprobe ...
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205 views

Adding bridge for LXC breaks NAT/DNS

I am having a issue with a small home server. This server operates as a DNS/DHCP/NAT. I am also trying to add a few LXC instances with JUJU however I am running into a issue with the bridge. When I ...
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121 views

Configure DHCP on Ubuntu 12.04 to share internet to subnet

I'm well aware of the plethora of documentation on setting up NAT and a DHCP server in order to share internet to a LAN. Here are a few articles that I think are getting me close, however I still ...
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57 views

Port restricted clone NAT not working

I have WIFI router contains public IP (10.10.10.10 dummy IP). But my router has no option for port restricted clone NAT, so I setup another computer (ip:192.168.1.200) installed Ubuntu, forward all ...
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102 views

How to use my ubuntu server as router?

+---+ eth1- *.1.6| S | =========| | |PC1|private net -------------------- ...
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IPtables logging… continues after command is commented and old rules flushed

I have the following iptables script. I do a sudo to execute it but before doing so I run a sudo iptables -F to flush all old rules. Yet, there are entries with prefix of iptables2: #iptables -t nat ...
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186 views

How to setup IPTABLES for logging/monitoring usage while using a DSL with a dynamically assigned IP

I am trying to set up a system to do NAT and other iptables-stuff (like logging, firewall, monitoring, etc.). The ISP provides a dynamic IP address and the DSL modem does NAT. I have the following ...
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69 views

no network in ubuntu13 when virtal box is configured with bridged adpater

I am using Ubuntu 13 on virtual box with my host being Windows 8. My aim is I want to ping from host to guest or from any physical machine to guest (Ubuntu).I am able to ping from guest to host but ...
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Unable to share internet via NAT connection sharing

I've been using my Jetson TK1 Remotely via ssh and NAT connection sharing as described here. Earlier everything was working perfectly, but now whenever I try to share my internet connection by running ...
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4k views

iptables/netfilter: What's the difference between PREROUTING and FORWARD?

I am trying to understand how this system works and I have problems to understand the difference between using NAT PREROUTING or filter FORWARD. From what I understand, the PREROUTE can send the ...
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30 views

Problem in virtualbox network

Install first time it was working properly. I wanted change network interface but i did't keep a backup. Now i can't connected to network in ubuntu server my host system is ubuntu pls advice me what ...
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885 views

UFW blocks traffic in NAT

I've created a VM guest with libvirt with the default NAT Bridge. (Host and Guest Ubuntu 14.04 Server) After creating allow rules for SSH and enabling ufw - on the guest - i can't connect to the ...
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472 views

Setup NAT on Ubuntu 14.04

I'm trying to insert my desktop between an appliance and the rest of the network to monitor the traffic coming off of it due to some security concerns. I'd like to setup NAT so that the devices behind ...
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9k views

Using Ubuntu 14.04 as router with iptables, clients can't go online. Probably DNS issue, iptables setting needed

CORRECTION 3: SOLVED! I needed to add the the official DNS server of my departement's VLAN as DNS to the clients. I've read through a large number of posts about iptables issues when using Linux as ...
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NATing ports selection using hardware detection

I have a linux box to be used as a router with a wlan port in AP mode. The internet input to the board may come from either an eth port (WAN mode) or another wlan port. There is also VPN running that ...
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182 views

Setting up NAT for internet access on a connected router

I'm setting up a NAT for a connected router to my laptop using the following command (IP forwarding is enabled): sudo iptables -t nat -A POSTROUTING -s 192.168.47.0/24 -o eth0 -j MASQUERADE So ...
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2k views

Hardcoded static IP assignment for eth1

I'm setting up a NAT, and need to assign a static IP to my eth1 interface. The problem is that once in a while, it resets, and I need to run the following command again: sudo ifconfig eth1 ...
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431 views

A question about the Internet/ConnectionSharing (NAT) via iptables

I'm following this tutorial to setup a NAT gateway: https://help.ubuntu.com/community/Internet/ConnectionSharing#Ubuntu_Internet_Gateway_Method_.28iptables.29 With simple eth0 as WAN and eth1 as LAN ...
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1answer
2k views

Dnat prerouting does not work on Ubuntu 14.04

I've got a Ubuntu 14.04 server used as firewall, router, dhcp, dns and proxy. Everything works properly from inside to the internet, but the forwarding from outside to the inside network doesn't work. ...
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670 views

How to disable NAT for IPv6 (NAT66)?

The current Ubuntu LTS does not support NAT tables for IPv6 (i.e. there is no ip6tables -t nat), and I'm fine with that, in fact, a NAT-less environment is the "core" of my networks. But, the next ...
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Open source stun turn server which can do hole punch is there similar packages?

Is there any open source stun/turn server which can do hole punch like numb for Ubuntu ? Numb is a STUN/TURN server. Description A STUN/TURN server is used for NAT traversal in VoIP. ...
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Ubuntu 12.04 LXC nat prerouting not working

I have a running Debian Wheezy setup I copied exactly to an Ubuntu 12.04 ( elementary OS, used as desktop as well ) While the Debian setup runs flawlessly, the Ubuntu version dies on the prerouting ...
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295 views

NAT forwarding not working

I tried to set up forwarding from eth0 to wlan0 in ubuntu: echo 1 > /proc/sys/net/ipv4/ip_forward iptables -t nat -F iptables -F iptables -t nat -A POSTROUTING -o wlan0 -j MASQUERADE iptables -A ...
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1answer
367 views

ip route - connecting two tun dev

Im trying to get two tun dev connected. If got everything, but the nat running. One tun is secure connection and the other tun for internet access. If got everything, but the nat running. There is a ...
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1answer
12k views

Networking problem with Ubuntu as guest in VMware workstation on Windows 7 64bit

I've the following configuration: A. Physical machine: Windows 7 64bit with VMWare workstation 8 with a physical network adapter with this ip configuration: IP 192.168.1.101 Subetnet Mask ...
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339 views

Share internet connection from computer without NAT

Is there a way to use my laptop with a wifi card and provide network access to my laptop without NAT? I currently set up network manager to share the internet connection and I can browse the internet ...
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35k views

Configure Nat in Ubuntu 12.04

I want to configure NAT for my network of 10 computers so that the data is transmitted via a single pc. Can anyone give a good tutorial for it?
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2answers
51k views

Configuring Ubuntu vmware guest NAT

I have a Windows host that runs guest Ubuntu VM via vmplayer. That virtual machine will be cloned, distributed among several people (running Windows hosts) and used for conducting a programming ...
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1answer
2k views

NAT not working in a container

Following instructions I've installed docker on ubuntu 13.04 (and 12.04 + 3.8 kernel), pulled the base container and started a shell inside it. It got a private IP and can ping it's default gateway ...
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Making Localhost as worldwide server

I am using Ubuntu 12.04 with KDE desktop. I have installed apache2 on my pc. I want set my localhost as remote accessible server. What I must to do? What is the NAT or Ubuntu servers settings?
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485 views

redirect traffic from 2 Ubuntu external NICs to specific internal hosts

I am having problems redirecting incoming traffic to 2 external facing interfaces on my Ubuntu 12.10 server to 2 separate internal hosts. I am able to redirect incoming traffic on my eth0 just fine to ...
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1answer
1k views

Unable to connect to my remote Ubuntu system using SSH

I want to connect to my remote PC running on Ubuntu 12.10 using SSH. But when I try ssh my_username@my_current_ip, I get this error: ssh: connect to host 117...** port 22: Connection timed out I ...
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What are the risks of NOT using a firewall (home computer)?

Since a password is required to be a superuser (to install and modify programs), what are the risks to not use a firewall under Ubuntu ? More particularly if I am using a NAT router ?
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How to run openmpi on virtualbox with 3 PCs through SSH?

I have 3 PCs with Vista, running Ubuntu through Virtualbox on them. I have installed openmpi and ssh on them, they are connected via ethernet. The IP addresses are all 10.0.2.15. And I can ping with ...