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

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Multiple static WAN addresses on Asus RT-N66U?

I'm trying to configure multiple static IP addresses on my new Asus RT-N66U router, I had fiber installed yesterday so my old Thomson router won't work any more unfortunately. Previously I ran a ...
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135 views

Is it possible to turn off NAT on some cheap wireless router?

http://amzn.com/B001FWYGJS I have several TP-Link and other brands' wireless router like that in above amazon link. They seem in common to default to not allow user to turn off NAT when I want to ...
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2answers
719 views

Connecting to an SSH server behind a NAT

I am having trouble connecting to an SSH server behind a NAT on an ubuntu workstation. I've installed openssh package(both the client and the server) and forwarded port 22 through the NAT and tried to ...
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1answer
38 views

Grabbing DHCP from DMZ?

Is it possible to grab DHCP from the DMZ of a router above? Essentially i want to have a setup like this. DMZ DHCP ------> Router (master router) | | ...
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326 views

Home LAN - heterogeneous network with two SOHO routers as WLAN Access Points - Failing

I have the first world problem that my home requires more than one WiFi access point (AP) to have coverage throughout the house. PROBLEM My wired router, directly connected and adjacent to my cable ...
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1answer
140 views

How to NAT to different interfaces under linux?

I have an Ubuntu 12.04 server with 4 ethernet interfaces, 2 of which connect to nonconfigurable network devices on eth5 and eth6. Each device can only be reached on 192.168.100.1 via telnet. I believe ...
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1answer
94 views

(Not all) port forwardings working correctly

I have two port forwardings configured on my internet router: router-external-ip=85.93.c.d:22 --> internal-host:22 router-external-ip=85.93.c.d:8010 --> internal-host:22 (Having only the last one ...
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2answers
2k views

Two network-ranges, one gateway - Double NAT issue

I have one network 192.168.0.x which is slowly running out of IP addresses. I wanted to remedy this by creating a second network for mobile devices (192.168.1.x). The first network has a gateway of ...
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44 views

Networking overview

I've been reading about networking hardware and network technologies recently, but I still can't quite link everything together. The route: Internet -> Modem -> Router -> Wireless Access Point ...
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34 views

Custom Local Direct Route Windows

I have an external IP address of a load balancer that I want to route locally for internal servers. What's the best way to do this? I was thinking I could use the command line route command to add a ...
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123 views

client still cannot get internet access from gateway pc

I have already set up a laptop as a gateway in ubuntu 12.04. with 2 interface cards. internet >> eth0 >> gateway pc >> eth1 >> Access Point for eth0 IP dhcp for eth1 Static Ip 192.168.5.1 Access ...
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VMWare Workstation VM Windows with static IP has no Internet Access

I've looked for answers first because it is probably basic e.g. http://serverfault.com/questions/220539/cannot-using-internet-in-vmware problem: on my vmware client machine (windows server 2008R2) I ...
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3answers
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Free VPN soft/service to connect two computers over internet behind NAT [duplicate]

I have two computers (home and work) that I want connect to VPN. Both computers are behind NAT. I have no access to network configuration so configuring VPN server on router is not possible. Is there ...
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30 views

In P2P networked applications is there a point to portforwarding at one level but not the other?

I connect to the internet through a VPN service that offers port forwarding. I'm wondering if there would be a point because the regular Ethernet connection I connect to the network through is behind ...
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3answers
208 views

Use single static IP for multiple machines

I currently have a DSL modem at home that has a static IP (say 77.77.77.77). This modem is connected to a wireless router which has a few machines connected to it. For sake of simplicity, from now ...
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503 views

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
240 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
950 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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4k views

Share local folder over Internet

How would I share a folder over the Internet and also have the machine on a LAN? The internet connection has a fixed IP. The purpose would be to host an Access backend. I know Access doesn't work ...
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302 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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1answer
1k 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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3answers
55 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
351 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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393 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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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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472 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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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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1answer
11k 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
644 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
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iptables gives me the 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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1answer
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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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411 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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37 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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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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72 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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1answer
122 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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179 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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393 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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99 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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80 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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1answer
96 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
147 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
6k 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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15k 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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2answers
9k 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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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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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
2k 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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1answer
1k 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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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 ...