Network Address Translation, a technology used to translate a private IP address into a public IP.

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How to configure a Linux NAT router with a single NIC

I have several Windows Servers running on an Azure virtual network with 2 subnets. I have a domain controller at 10.0.0.4, and servers at 10.0.1.4, 10.0.1.5, etc. I configured a point-to-site VPN, so ...
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1answer
77 views

How does uTorrent can automatically forward port through Linux Net Filter based firewall?

I have dilemma: How it is possible that uTorrent shows on my internal machine with internal IP, that my connection is OK (green check in the bottom right of its window), while I never forwarded any ...
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3answers
281 views

How to set up SSH tunnel between 2 machines behind 2 different NATs

I have Windows PC behind a NAT/Firewall at home, and a Windows PC behind a NAT/Firewall at work. i.e. Neither PC has a publicly visible IP address. On each of the PCs, I am running a Ubuntu VM on ...
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2answers
150 views

Router Behind A Router

My condo building provides wifi. However they have a stupid terms of service window you have to accept before getting access. I wrote a script that can post automatically to that terms of service ...
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85 views

How can I get VMware Fusion to give a static IP to an Ubuntu guest?

I looked at How to assign a static IP address to my VMWare machine? and didn't find an answer: I am running VMware Fusion on Mavericks with an Ubuntu Saucy guest, the guest connected to the network ...
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231 views

Squid proxy server vs NAT rule of Mikrotik router

I have installed squid proxy server to hide our network ips after some time it becomes slow then I read through NAT rules to achieve what I want by proxy server. As per this link the difference ...
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3answers
49 views

PAT Internals. How is it de-multiplexed?

Question: Assuming PAT is enabled on my home internet router, how does my router know which hosts to de-multiplex packets to when it receives packets from the internet? Example: On my LAN there is 2 ...
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2answers
170 views

OpenVPN connect to server not accessible from internet

My ISP sucks at IPv4, so they are NAT'ting one public IPv4 to multiple customers (they call that DSLite). The problem is: I can't open ports for incoming connections. My public IP can't even be pinged ...
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146 views

How to route to public IP addresses from NAT where gateway is in subnet of target public ip addresses

I have the following scenario which is giving me fits. I have a block of IP addresses on a .248 subnet. The service is Comcast, and the modem uses IP addres ending in .246. On the router for my ...
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123 views

iptables NAT doesn't preserve remote IP

I have the iptables rules below forwarding incoming ssh traffic on port 2222 to a virtual machine running in a vmware "vmnet" network on the same host. 192.168.1.1 192.168.1.40 +---------+ ...
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92 views

Network adapter connected by NAT has same address as host

I have created a virtual machine with 2 network adapters, one connected to the host using NAT and the second connected through a host-only adapter. This set-up works for what I want to do, Give the ...
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436 views

How to configure AirPort Extreme as the DHCP/DNS/NAT server where DSL modem/router does them?

I have an AirPort Extreme BS and a modem/router (ISP's NetMaster). I want to host my own websites from my Mac Mini with OS X Server. At the moment, ISP's router is the DHCP/DNS/NAT server, and AirPort ...
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553 views

Why is my connection refused when port-forwarding?

This question is related to this: Application / Device setup for remote network connections I have a 2wire 3801HGV router and I made some firewall settings to open some ports on one of my connected ...
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1answer
141 views

NAT with IPv6 (Forced by ISP)

My ISP has recently decided that "high bandwidth clients" are now forced to use IPv6. While I can plug my laptop with Win7 directly into the modem and I have access, connecting routers or my ...
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2answers
678 views

iptables gives me and error “can't initialize iptables NAT”

I am trying to use iptables and it is giving me the following error root@vikkyhacks:~# iptables -t NAT -L iptables v1.4.18: can't initialize iptables table `NAT': Table does not exist (do you need to ...
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143 views

Home router with NAT makes internet much slower than with bridged-IP

I have a BeWAN iBox A5100 wireless router and a 100 Mbps direct internet connection (non-DSL). When I use the bridged IP option, speedtest.net reports downlink speed as 85mbps which is quite OK. When ...
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154 views

Iptables filtering and NAT with secondary IP address

I have two IP addresses on my physical eth interface. Lets say 192.168.10.7 (eth0:0) and 192.168.0.7 (eth0). So it works. But I use application, working on the only one of this addresses on port ...
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1answer
30 views

Use a PC as a one client router/switch

I have a laptop running win7 , with two network cards wifi and normal wired (RJ45). I normally use the wifi for internet connectivity (Via a personal router). I have a raspberry pi, also with a rj45 ...
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165 views

FreeSwitch - how to configure ICE, Turn, Stun, NAT traverse mode?

I have been using FreeSWITCH but some of my test users are behind very complicated network. Where default FreeSWITCH setup is not working such as: they can't register via SIP and also there are audio ...
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1answer
279 views

Disable NAT/bridge LAN to router's network

I'm at a third world country, connected to a neighborhood ISP (an ISP that serves neighboring neighborhoods) and they have some "value-added services" where they have FTP servers and Windows shares on ...
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38 views

How do I configure NAT to forward external requests?

I have three Raspberry Pi's connected to Linux machines and one computer (also a Linux machine) connected to a router which is connected to the Internet. My goal is to configure each Raspberry Pi and ...
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71 views

How do I configure NAT to forward external requests?

I have three Raspberry Pi's connected to Linux machines and one computer connected to a router which is connected to the Internet. My goal is to configure each Raspberry Pi so that they can ...
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132 views

centos 6.4 nat virtual machines not able to connect to the internet

I have two virtual machines running on virtual box. The master has one interface(eth0) bridged to the host nic(eth0) and another one connected to the internal network(eth1). This acts as a gateway to ...
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246 views

How to proxy windows TCP port (that is under NAT) via linux with public IP?

I have a server (where I am administrator) to which I can connect via MSTSC.exe from windows under NAT. server is under NAT. I have ssh and sudo rights to Linux server with public IP to open ports 2k ...
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65 views

Is it possible to communicate two networks without being dual nat?

I have two separate networks, at two different locations, each with there own internet, connected with a nanobridge(lan/lan). I have both networks set statically so that they aren't always crossing ...
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55 views

Fully NAT incoming connections while keeping masquerading working

How would you go about the following: Note: Internet access should work at all times using the classic MASQUERADE action in the nat table's POSTROUTING chain. Now the challenge: for all ...
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55 views

Redhat in VMware - adding second VNIC set up with NAT for SSH

I have had a questioned answered on a issue I was having with Hamachi VPN and connecting it to my Linux VM to use a tunnel for SSH outside my local home network. The person that answered the question ...
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1answer
74 views

How to secure port forwarding on AirPort Extreme

I have a small home server to share photos, blog, videos, etc. with family and friends around the US and Western Europe. Of course I have seen evidence of malicious scanning against my ...
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2answers
975 views

VirtualBox with Ubuntu Server guest can't ping outside

Here's my situation: an Ubuntu 12.04 Host running VirtualBox; two guest VMs running Ubuntu Server 12.04 home network, so my Host pc has a wireless connection to the router of my ISP. My problem is ...
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49 views

Cisco 861 Router forces one-to-one NAT

I have a cisco 861 router that only allows one-to-one NATs in order to access the Internet. I would like for computers to get an address via DHCP from this router, and be able to access the Internet ...
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2k views

Port Forwarding from inner network to inner network (hairpin NAT)

I've successfully setup a port forwarding on a Mikrotik router that translates every request going to WAN ip address on port 8844 (let's say: 20.20.20.22:8844) of mikrotik to the local ip address and ...
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1k views

Can't access my IP camera over the internet

I have an EasyN F3 (F3-M166) IP camera. It works fine on local IP address, but I can't access it over internet. This is what I have done step by step: I configured the local IP (camera_ip) and port ...
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51 views

Getting problems connecting to my server

I have a problem in my network. I have one network with 3 computers, 1 printer and 1 windows server version 2008. All computers in the network connected to the server have 192.168.1.xxx- IP addresses. ...
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916 views

Using iptables to give an LXC container a routable IP

I'm using Docker to manage LXC containers. At the moment Docker configures the underlying LXC container with host-only routing and then uses iptables/DNAT to punch holes into the container, making it ...
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3answers
453 views

Does NAT Map to the MAC Address, or to the Local IP?

I would like to set up NAT to put a service on internet using my Technicolor TG 582 router. I mention the specific router model just to have a reference, but the question goes in general as I may ...
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522 views

Route between two network interfaces with same IP address?

I would like to temporarily monitor/log/analyze what traffic is going in and out of my home. I would also like to keep my current router configuration unchanged. The router is a WiFi Home Router, so I ...
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622 views

Forwarding RDP connections with iptables

I have a workstation that runs Windows 7 as the host, and Ubuntu Server 12.04 in VMware on a bridged network. Both have their own static public IP address. However, I only have one hostname to work ...
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63 views

Should I set up NAT for computer (Steam) online gaming?

I tried Googling this and it only resulted with results about Xbox. Should I set up any settings for NAT if I plan on nearly exclusively plan on gaming with my computer? I will still watch YouTube ...
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276 views

Port Forwarding to internal device without default gateway using iptables

I need to access externally (via Internet) one device in internal network which has no default gateway configured. Just IP and Mask. The standard iptable rule to accomplish the first part of this ...
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2answers
1k views

Attach network interface to vmware nat (bridge is not working perfectly)

I have a developer computer with two physical network interfaces (NIC A and NIC B). I have VMWare workstation and several virtual machines in VMNet8 (NAT). I would like to connect my notebook to my ...
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49 views

Ubuntu machine not visible on internal network

I have the following problem. My laptop with Ubuntu can connect to my home network without any problems, but it's internal IP (10.0.0.5) is not visible to any other machine on the network. I have ...
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32 views

How to restrict RemotePort of ssh to particular ports?

Consider ssh -R '0.0.0.0:9090:localhost:5050' restricted@myvps.example.com A laptop is running a webserver on port 5050 The laptop is behind a router with NAT and port forwarding cannot be ...
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33 views

any software that can do port forwarding for me when issue with double nat present

I have modem/router from Comcast and per some diagnostic tools that Comcast modem/router is creating what is called "Double nat". I don't want to replace modem/router, don't want to put it in a bridge ...
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76 views

Is there a simple way to remotely administer devices shipped to clients?

I plan on shipping small devices (like a MinnowBoard or CuBox) to some people. Is there some sort of software package that can "phone home" so that i have a way to administer it? My current ideas are ...
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557 views

How to use DNS server behind NAT router

I have a local DNS server that I want to use, but it's behind a NAT router. For all other servers that are behind that router, I simply have an appropriate forwarding rule enabled in the router. ...
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45 views

linux natting one wireless card and a wired connection is not working

I am following instructions in http://blog.oberghmans.be/?p=71 to nat my wireless connection with some pc's that cant be connected to the router with a wired connection, using a Dlink DWA-525 Wireless ...
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260 views

Open ports and disable firewall from router D-link

I want to open and use the incoming ports from WAN to LAN: 443 (https), 1243 (mssql), 3306 (mysql), my firewall windows is open for out an in , I have static ip, I have the router D-link DSL 2500-E, ...
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170 views

I can't disable the firewall from my router

I have the router D-link DSL 2500-E, the simulator is here http://suporte.dlink.com.br/suporte/emuladores/ADSL/dsl-2500E/emulador/fw-dmz.htm. I want to open and use the incoming ports: 443 (https), ...
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NAT routing command in windows

Is there any specific command in windows which do the following task: I want to modify the source IP address in the packet whose Destination IP is not in the private LAN, i.e., I have a virtual ...
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67 views

issue setting up home server

Alright, I realize this isn't a professional server question, but this seemed like the most appropriate place to ask. I'm working on some web design projects and I've been dissatisfied with many of ...