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

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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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8k 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
556 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
4k views

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
873 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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364 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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36 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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2k 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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66 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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110 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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160 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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347 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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88 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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1answer
73 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
92 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
138 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
5k 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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13k 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
7k 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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2answers
83 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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2k 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
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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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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2k 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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95 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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2answers
2k 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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1answer
92 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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1answer
2k 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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466 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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422 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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153 views

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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76 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 ...
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149 views

Using my laptop as a router for a VM and embedded computer?

I've got a laptop running 64-bit Windows 7 Home Premium with Ubuntu 12.04LTS on VMWare Player. Connected via a crossover cable to the laptop is a Raspberry Pi, which uses my laptop's shared internet ...
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194 views

How do I know if a NAT device is taking place on my network?

I am trying to deploy a Tahoe-LAFS grid on my machine, but other machines can't connect to mine. In the configuration doc it mentioned that a NAT device in action may need further configuration. So I ...
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1answer
3k views

How to use NAT iptables rules for hostapd

My PC is equipped with two net interfaces - wlan0 and eth0. I want to use WiFi port as access point on wlan0. So i use hostapd facility and it works properly in routing mode in local network. Users ...
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1answer
3k views

Torrent upload ratio not updated on Synology DS212+

I have a Synology DS212+ NAS running DSM 4.2-3211 (current version). I use it for several purposes including torrent download using Download Station and a tracker that needs authentication. My ...
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1answer
390 views

iptables, redirect from ip address to loopback

I have an Apache web server listening in 127.0.0.1:63280 eth0 has IP: 172.200.200.200.1, and try to connect from workstation IP 172.200.200.200 iptables -t nat -A PREROUTING -s 172.200.200.200.1 -p ...
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How to access a 3g IP camera from the outside?

I'm new here, but i've searched google a lot and this website but couldn't find anything. So here's the situation: I had no idea 3g devices could not be directly reachable from the outside. So I ...
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2answers
459 views

Enabling NAT loopback on HG556a router?

This is one of the standard issue vodafone routers. So i set up web-server on my laptop, and it is accessible to the internet now. However I need to be able to access it from my machine using the ...
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1answer
400 views

Router/NAT and IP/TCP header checksum

We know that IP/TCP has checksum mechanism to guarantee communication reliability. However, when a IP/TCP packet is relayed by router or NAT, the IP header may be modified, if if the router/NAT ...
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445 views

connecting to the internet while nat is disabled

I have four PCs, and i want to use one of them as a web server, but i still want to surf the internet from the four PCs at the same time. in Egypt we have an ISP called "tedata" which offer three ...
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2answers
325 views

Route/NAT/Port forwarding for one port only?

I'm not sure what is the correct term to use and I don't know what tools should I use. The only thing I have is a goal which I'd like to accomplish. I have two linux machines(A and B) and a remote ...
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2answers
5k views

ssh through a router without port forwarding

I have a linux server, and I want to put it in a home network behind a router. I need to ssh to this server sometime from outside, but I don't want to set up port forwarding because I don't have ...
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1answer
412 views

How to ssh my desktop(ubuntu) from outside network [duplicate]

I have set up simple ssh server by using openssh on my Ubuntu. I tried to ssh it from my Mac, which successful. But my mac is in the same subnet, which behind same router at my home. my ubunut local ...
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41 views

How can I estimate the number of feasible mappings for a NAT router..?

If I have understood correctly, a device performing NAT cannot do more than : Total number of mappings = (Number of out-going Internet IP addresses) x (Number of Ports) Is this correct..?
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Why has this organization reserved a public address space when they are being used in a private network? [closed]

In this organization, all servers and personal computers that I have worked on have a static IP belonging to the Public address space assigned to it. There must be NAT-based firewall/s as my external ...
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1answer
7k views

Does a Wi-Fi range extender create a separate network?

Would a Netgear range extender, for example WN2000RPTv2, create a separate network? I wasn't able to tell by looking at the user manual online. How do these things generally work? Does it just, as the ...
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263 views

Cannot reach specific public IP

My server (runs on Ubuntu 12.04) is behind a NAT and has to access a specific service that has a public IP address (64.*.*.*). The problem is that I cannot reach that specific public IP (all other ...
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324 views

Iptables: Allow Internal LAN to access INTERNET

I have an internal network behind my router on eth0, and I have my router connected to the internet thorugh wlan0. I can't access the internet from inside the lan, how can I fix this? wlan0: ...
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214 views

How do NAT or proxy react to incoming TCP SYN packet?

In some messaging systems, two messaging clients send/receive packets directly from each other in chatting or voice call. I think the basic mechanism is (TCP for example): these client programs open a ...