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

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9
votes
5answers
21k views

Is it possible to host a web server from behind a NAT

My PC is behind a NAT router that has a public IP address. If I want to host a website then I believe I need a domain name which I can purchase from some site which would pledge to resolve all DNS ...
8
votes
7answers
27k views

How can I make my home PC a web server?

I am running Apache Tomcat on my PC. My PC is connected to a router in my house and the router is connected to my ISP. Now I want to run a server on my pc so that my frined can view my site hosted on ...
2
votes
1answer
2k views

Connecting to my own network via external IP

Even though I have seen and read quite a few similar Q's I was still unable to understand what is required for me to be able to do this. I have an internal network. One of the machines is a web ...
56
votes
9answers
155k views

How to do networking between virtual machines in VirtualBox?

I have two virtual machines in VirtualBox. I would like to do networking between them. For the moment I have the default configuration on both, but they seem to have the same IP-address 10.0.2.15. I ...
11
votes
2answers
6k views

How does the router know which device to send packets to? [duplicate]

my question does not concern how it moves through the internet, but how it moves through the router to a certain device. All devices connected to a router in a home network have the same external IP. ...
10
votes
2answers
13k views

how to access samba on a guest Linux behind the VirtualBox NAT?

On my laptop, I'm running Ubuntu 9.10 under WinXP using VirtualBox 3.1.2. I want a setup where: The guest can freely access the internet. The host can access the guest files via Samba. The setup ...
19
votes
5answers
17k views

SSH access to office host behind NAT router

I would like to access the ssh port of my office linux host from home. Unfortunately the host is located behind a NAT router. So, the IP address is not publicly available. There is however access to ...
4
votes
1answer
8k views

Accessing a website via the webservers public IP from a PC within the same LAN

If two machines reside on the same LAN (a PC and a Webserver) why is it necessary to enable ‘NAT loopback’ on the router in order for the PC to access the website hosted on the webserver using the ...
2
votes
2answers
829 views

How does Http server distinguish between computers behind a router

HTTP servers usually operate at port 80. Yet NAT routers as most are these days assign port to outgoing requests so they would know when request is returned that which computer connected to it, it's ...
7
votes
3answers
16k views

Connecting to VirtualBox guest (ubuntu) from host (osx) via NAT?

I have a VirtualBox guest (running Ubuntu) configured with NAT through my host laptop (running OSX). It was my understanding that with NAT configured, I could access the guest from the host (w/o any ...
11
votes
8answers
58k views

How to get my external IP address (over NAT) from the Windows command-line? [duplicate]

The Windows "ipconfig" command can only show me the parameters from the Ethernet interfaces from my machine (even with the ipconfig /all argument). It can show detailed information about the ...
-3
votes
2answers
1k views

How does Network Address Translation (NAT) works on a home router? [duplicate]

I have three computers connected to a router at home. I am sure my router has only one address. When the packet arrives from computer 1, the source IP is translated to the router IP address. Let's ...
6
votes
3answers
332 views

Two websites give different values for my IP

I just found something curious: http://whatismyip.org/ says my IP address is 82.44.14.246 http://www.whatismyip.com/ says my IP address is 31.52.118.197 I'm based in the UK and behind a router ...
1
vote
3answers
5k views

enabling loopback NAT

I have a Qwest Aciontec Q1000 modem/router combo, which does not support loopback. I run a webserver on the LAN, and when I'm on the LAN, I can only access it by its local IP 192.168.0.201. When I'm ...
4
votes
1answer
2k views

How would I test to see if I'm behind carrier grade or regular NAT?

Inspired by the comments to this answer and its question. Some of my local ISPs are using carrier grade nat, and as someone who occasionally runs his own servers, remote support, it would be highly ...
3
votes
1answer
2k views

Duplicate Name Exists error from virtual PC with NAT network configuration

Whenever I change the network configuration to NAT for a virtual machine running under Virtual PC 2007, I get "A duplicate name exists on the network." error. There is no other machine on my network ...
1
vote
3answers
11k views

Win 7: Share internet connection via Ethernet and WiFi

I have the following configuration: Box 1. Running Win 7, connected to the Internet via Eth0. Has one wireless network adapter and one another ethernet adapter (say, Eth1). Box 2. Running Win XP, ...
11
votes
5answers
3k views

Does NAT provide security?

I'm following discussions about the IPv4->IPv6 transition, and IPv6 doesn't seem to like NAT at all. I've always thought that NAT was helpful in v4 for some security, I know it doesn't really hide ...
13
votes
2answers
5k views

How will home networks work in the IPv6 world?

Right now, I have a home network setup behind a Netgear router. That router has a public IP address I get from Comcast. I also have a computer setup on my home network running Linux that runs a DHCP ...
6
votes
2answers
11k views

How to open file and printer shares to the internet?

i tried to make file and printer sharing open to the internet on NT3.51 in 1998, but it just refused to actually ever work. Are are the IP ports and protocols that must be port-forwarded to make file ...
5
votes
4answers
6k views

how to ssh two computers behind NAT and Firewall, without third computer

I am trying to ssh into my Linux box at home. My home is a dorm-style environment - NAT and Firewall with personal laptop running Arch Linux. My work is corporate style Windows 7 - NAT and proxy ...
4
votes
2answers
8k views

NAT Port Forwarding in VirtualBox

I have enabled two adapters in my VirtualBox (running Ubuntu 12.10 Server Edition), with types as: Host-only and NAT. My main motive is to be able to connect two VMs running on two different hosts ...
3
votes
2answers
5k views

Bridging my laptop's wireless and wired adaptors

I would like to be able to connect a desktop computer that does not have a wireless adapter to my wireless network. I could just run a network cable from my ADSL/wireless router to the desktop ...
2
votes
3answers
6k views

NAT vs public IP (and blocked ports)

I have a problem with my ISP. They say that they don't block any ports and I have public IP, while I think these both statements are false. Before I talk to them again (which is really tough when my ...
8
votes
2answers
644 views

What do the various IP addresses mean?

When I visit a website (e.g. whatismyip.com) it states that my IP address is 13.151.xxx.xxx. However, when I run ipconfig, my IP address is 192.168.0.xx for IPv4 and my DNS adress is 202.xx.xxx.xx. ...
4
votes
2answers
4k views

Better ways to setup a webserver behind ISP's NAT

Our entire road is behind an ISP NAT that I can't access. Our ISP wont forward a port either. My workaround, I setup an ipv4 to ipv6 tunnel using freenet6. I get a domain like ...
2
votes
1answer
384 views

How does a IP packet from a remote server “find” a home computer behind a NAT firewall?

I understand communication between a remote machine, e.g. a webserver and users home computer/device can only occur if the users computer initiates the communication (assuming your firewall/network is ...
1
vote
1answer
16k 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 ...
11
votes
3answers
5k views

NAT and UDP replies

Sanity check please. If I send UDP packets from Machine A behind a NAT to Machine B's port N, where Machine B is outside the NAT (elsewhere on the Internet), can I reasonably expect that NAT to pass ...
8
votes
8answers
11k views

VMware Player loses internet connectivity

Periodically, the internet simply stops working in my virtual machine, and the only way I can get it working again is to restart the host computer. Since I use the virtual machine specifically for ...
5
votes
3answers
6k views

VirtualBox NAT port forwarding on Ubuntu 64?

I have an Ubuntu 9.04 desktop 64-bit guest OS running on an Ubuntu 9.04 desktop 64-bit host OS (yes, the same OS). I'd like to run a web server on the guest and make it accessible through NAT on the ...
3
votes
2answers
2k views

VirtualBox network configuration

I have a CentOS 6.1 virtual machine, virtualized with VirtualBox on Windows XP. This machine hosts my local development MySQL server. I'd like to find the correct network configuration, so that: my ...
2
votes
3answers
3k views

How to link two routers LAN to WAN

My former modem was replaced by a all-in-one modem/router (10.1.9.1/24) after a speed upgrade. I still have my DD-WRT router (10.1.10.1/24), which I want to be my main router, i. e. as DHCP server, ...
2
votes
1answer
1k views

Subdomains for server behind NAT

I have server (ip: 192.168.1.2, openSUSE 12.2, Apache 2) behind router (ip: 192.168.1.1, TomatoUSB Toastman Build). I'm using FreeDNS (afraid.org) and I assigned subdomain (say x.afraid.org) to ...
2
votes
2answers
371 views

Without NAT on IPv6, and only one DNS name, how do i talk to my servers?

Right now we own one domain name (e.g. superfault.com). From the internet i can connect to a variety of networked devices using that single DNS name: superfault.com ...
1
vote
1answer
533 views

Remote SSH access doesn't work when OpenVPN client is enabled on DD-WRT

I have a DD-WRT router which I would like access remotely via SSH. The DD-WRT is behind an ADSL router which has port forwarding for port 22 enabled, DD-WRT SSH access and service are set to port 22, ...
1
vote
1answer
3k views

Why can't I access MySQL server with port forward rule in router?

This is my setup (the relevant parts, anyway): I have port forwarding rules in place (in the Linksys) for all the relevant ports and I've restarted that router multiple times, each time hoping that ...
1
vote
2answers
1k views

TCP/UDP hole punching from and to the same NAT network

I was wondering if tcp/udp hole punching would still work when you are in the same network (behind a NAT), and what the packet's path would be. What happens when using hole punching on the same ...
0
votes
2answers
284 views

Traffic redirection with Rasperry Pi router

I use a Rasperry Pi (running raspbian) as a wi-fi router. It redirects traffic from the Ethernet wire (eth0 - wire + ppp0 - L2TP connection, lx2tp used for it) to wlan0 (USB wi-fi dongle, hostapd used ...
0
votes
2answers
917 views

Understanding port forwarding and NAT

I've got some confusion about port forwarding vs NAT. I know the problems NAT causes for P2P, and that there exist some solutions to it (STUN,TURN,etc) which require a relay server to setup direct ...
5
votes
2answers
4k views

Connecting to a VirtualBox machine from the host, using an ip address

In a macbook host, I run VirtualBox having a guest ubuntu server, with a NAT network setting. In the virtual machine application "Parallels", I would get on the host an IP address of the guest, to ...
5
votes
3answers
342 views

What hardware and OS should I use for my home router/server setup for good filesharing capabilities?

I would like to set up a new server at home that should be able to perform the following tasks: Act as firewall/router/NAT for my home network Share lots of files, mostley music Misc. other stuff, ...
3
votes
1answer
4k views

Virtualbox -> Can't add 2nd adapter to network for VM

I have a Debian Wheezy VM running in virtual box with the 1st adapter being NAT. However I want to also add a Host-only network but I can't add 2nd adapter to network for VM, it is grayed out. Any ...
3
votes
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 ...
3
votes
3answers
581 views

How to host a webserver through NAT?

I've come across many "How to host something while behind NAT" but none are like my situation (I knew how to host a server through a simple NAT anyway). This is how my ISP works... First, start off ...
2
votes
1answer
1k views

How to forward ports through ssh and nat to another machine

I have a problem when using ssh port forwarding and nat simoultaneously. Situation: Machine A runs a webserver on port 8080 Machine B is a raspberry pi which works like a little router. It has two ...
1
vote
1answer
579 views

Forwarding ports after carrier grade NAT?

I cant forward ports anymore to my Xbox cause turns out my ISP recently refreshed IPs and all their IPs are public now and they say you can only forward ports if I request a static IP for a large ...
1
vote
1answer
745 views

Changing the default network VirtualBox assigns to VMs attached to NAT

By default, VirtualBox assigns a 10.0.2.0/24 address to a VM attached to NAT. Is it possible to change NAT to a different network? This is not a duplicate question. I know it is possible to define a ...
1
vote
2answers
357 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 ...
1
vote
2answers
568 views

ISP 5 Device Limit - double NAT the solution?

I have asked this question in response to another question here ( 5 Max connections/devices to the internet? Is my ISP limiting me somehow? ), but thought I should start a thread to see if I can get ...