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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NAT to PPTP Client

I have not got much experience with routing and so we turn to you. I have a WAN interface and interface ppp0 Clients are connected via WAN to PPTP site. I would have no need to dial a VPN like to add ...
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114 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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Routing with virtual interfaces

How do I setup Ubuntu Server (14.04.01) with public eth0 and private eth1 to act as a router for multiple public/private IP pairs. eth0: 200.0.0.2 eth0:1: 200.0.0.3 eth1: 192.168.0.1 ...
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118 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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UFW behind a router blocks traffic from the outside world

I'm seeing [UFW BLOCK] entries in my logs, where SRC=173.194.67.16 DST=192.168.1.2. My box is behind a router, DST is my internal IP, SRC seems to some Google server and I don't understand how is it ...
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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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Natting with Ubuntu 14.04 won't forward the packet to the originator

I have succeeded in creating a VPN on amazon VPC using ubuntu 14.04 with openswan. My subnet on amazon is 192.168.254.0/24. My gateway which is in this case ubuntu 14.04 has 192.168.254.17 IP. The ...
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How Can I set the MAAS Network adaptor to do nat on ubuntu 14.04?

How Can I set the MAAS Network adaptor to do nat on ubuntu 14.04? Do I need to config NAT on router? Do I need any specific router for NAT?
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\0 for the USB-LAN Adapter device name for netfilter library

I have a network emulator which works on top of Linux's netfilter. It uses the user-space library to build a simple emulator, which gets traffic from the machine's LAN device (eth0), and forwards it ...
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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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111 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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125 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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59 views

NAT VM network to adapter another VM Network adapter

I have Ubuntu as a host OS , and i have installed Virtual box 4.3.10 , 2 VMs have been prepared VM1 (windows 7) VM2 (Arch Linux) for network security Windows 7 only can access the internet while ...
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809 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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172 views

vuze: 0 users — but was working fine before clean install!

Vuze gives an error that "0 users" are connected, and a firewall error. I don't think it's the network, because the same network was working fine just a few hours ago. Vuze was working perfectly up ...
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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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703 views

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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251 views

Network access from Ubuntu 13.04 guest to Windows 8 host machine

How can i access my Ubuntu 13.04 guest vm from my Windows 8 host machine? The virtualization is done using VMware Player 6 Network Details Host: Windows 8 IP Address - 192.168.200.10 Network ...
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1answer
162 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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170 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
7k 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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227 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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252 views

Connect to a L2TP server from Ubuntu Server 13.04

I need to establish connection with the L2TP-server (VPN) from my Ubuntu Server 13.04 machine in order to gain access to the Internet. How can i do this? I can find a lot of guides how to do this ...
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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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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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3answers
469 views

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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304 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
793 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 ...
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4k views

Two guest in one NAT range (virtualbox)

I have two VMs(Ubuntu) in virtualbox and I wanna assign the first one 10.0.3.15 and the other one 10.0.3.14. But when I set network type to NAT the network adresses are different, 10.0.3.15 and ...
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forward port 80 for multiple IP addresses on the same Ubuntu server

I am using an Ubuntu 12.10 server as a router/NAT for an internal network to the internet. I have also configured the server to forward port 80 to a server sitting on my internal network. This all ...
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Ubuntu router breaking internet radio streams

I have Ubuntu 12.04 up and running fine as a DHCP router with great throughput to my connected devices. two single nic's (one onboard and one PCI-e, both with Realtek 8111E chips) are used as WAN and ...
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836 views

how to access samba shares via nat?

I have setup a virtual machine in Virtual Box and installed a Samba Server. I changed the guest operating system's NIC from Bridged to NAT for a reason that I can't remember. I then added a additional ...
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vitualbox NAT stopped working after Ubuntu upgrade to 12.10

After upgrading to 12.10 from 12.04 none of my virtualbox virtual machines can use NAT to access the network. I have tried vboxmanage modifyvm --natdnsproxy1 on and/or --natdnshostresolver1 on, but ...
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1answer
356 views

How can I 'ssh' to an ubuntu server running on VirutalBox

I have installed Ubuntu Server on a virtual machine in VirtualBox which runs on Windows 7. How can I connect through ssh to that virtual machine? I go and type 'ifconfig', and i get this address ...
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729 views

ufw configuration nat ppp0

please some tips how i can allow this request in ufw: [UFW BLOCK] IN=ppp0 OUT=eth0 MAC= SRC=10.11.22.2 DST=8.8.4.4 LEN=71 TOS=0x00 PREC=0x00 TTL=127 ID=52 PROTO=UDP SPT=59405 DPT=53 LEN=51 i tried ...
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Virtualbox DNS stopped working on upgrade to 12.10

I have a Debian image setup on Virtualbox that uses the default NAT to access the internet. It was working fine before I upgraded to 12.10. After I upgraded the DNS lookups no longer work. I still can ...
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1answer
6k views

how to connect to a remote desktop behind a router?

Here's my setup: I have a laptop that I roam around everywhere with, and I have a desktop computer at home that is connected to the web using a router with NAT. My objective here is to create an SSH ...
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1answer
815 views

Ubuntu Server 12.04, NAT, Router, DNS. It just doesnt work

I recently inherited some server hardware from work and decided that it could be my main router at home (among other things). Ubuntu 12.04 server installation harware wise goes well and everything is ...
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1answer
1k views

How to make sysctl network bridge settings persist after a reboot?

I am setting up a notebook for software demo purpose. The machine has 8GB RAM, a Core i7 Intel CPU, a 128GB SSD, and runs Ubuntu 12.04 LTS 64bit. The notebook is used as a KVM host and runs a few KVM ...
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NATTING in Ubuntu Server

My Server has two NIC, One is connected to the Internet Service provider with dhcp ip (dynamically change) given by ISP and other NIC is connected with local Switch with 192.168.1.1 IP. Now I want to ...
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Remote access from an Ubuntu desktop on internal LAN over internet to Ubuntu machine on another LAN

This question is prompted by another question here. Now I use teamviewer to connect to a Ubuntu desktop in a customer's LAN from my LAN. I get a password and access ID from him and connect, then use ...
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IPv4 Address Sharing Issue? Trying to map IPv4 address from host OS to BT5 VM [closed]

I'm having a general networking issue in regards to my Backtrack 5 (x64) KDE VM in VirtualBox. The VM appears to be on a separate subnet, but for my purposes, I'd like to include the VM in the private ...
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1answer
1k views

Log destination IP with iptables

I want to log destination IP addresses in my Ubuntu router. I have two network cards eth0 - 10.0.101.254 eth1 - 10.0.101.253 10.0.101.254 is the GW for all hosts on my network. The router ...
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How can I solve an Xbox 360 'NAT Moderate' issue if I don't have access to the router? [closed]

After finally managing to get my Xbox 360 to connect to live, I've run into the "NAT moderate" issue. First of all here's my setup... wireless broadband >(usb)> laptop ubuntu 11.10 >(ethernet)> ...
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1answer
530 views

Is it possible to setup a DHCP server only for local virtual machines?

I have a quick question. I have a bunch of virtual machines (VMWare Workstation) running on an Ubuntu server and have found that VMWare NAT (DHCP) service is unreliable and slow. I have to use NAT ...