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

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filtering Internet traffic and caching on another machine using a dd-wrt router

In my home network, I have a spare machine which I would like to configure to filter Internet traffic (block ads) as well as cache content. I would like to tell my DD-WRT router to pass all Internet ...
2
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1answer
561 views

How to go around a modem's port forwarding incapabilities

This custom cable modem my ISP gave to me does not support forwarding an external port to a different internal port. (For example, I can't forward an incoming connection on port 80 to port 3389 on my ...
0
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1answer
217 views

Why does NAT64 require DNS rewriting?

When a IPv6 only host wants to reach a IPv4 only host, why does the DNS server (or possibly the NAT-PT gateway?) have to rewrite the A responses to AAAA? Couldn't IPv6 simply embed the IPv4 address ...
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1answer
208 views

What are all of these NAT terms? [closed]

I (loosely) know about Network Address Translation (NAT) in that the NAT device stores a mapping of external ports to internal ports. However, I started reading about it and got really confused by all ...
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2answers
570 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. ...
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0answers
454 views

Mac OS X Lion - forward all connections on port 22 to external ip

I need to forward all connection to any address port 22 to a different gateway (i.e. no default). Firstly I suppose to do it with ipfw: sudo ipfw add 5 fwd $EXTERNAL_IP,22 tcp from any to any 22 ...
2
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1answer
80 views

Multiple Servers, externally, through single IP

Let's say, I have a server which is directly connected to the internet (no firewall), and sits on 66.77.88.99 externally and internally sits on 192.168.0.1. I have my domain's records set up so that ...
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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 ...
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0answers
212 views

What's on /etc/nat folder in OS X Lion?

As I tried to edit /private/etc/nat/autoportmap.plist, I accidentally modified permissions on the nat folder and asked Lion to apply it to enclosing items (I was giving myself write permission). As a ...
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2answers
1k views

Is it possible to statically assign public IPs and use DHCP on the same router?

My ISP has given me a set of public IP addresses I can assign to various devices. But they have been controlling everything, and I've had to call them to make any changes to the configuration. I'm ...
3
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1answer
2k views

Why is this iptables rule that does port forwarding not working?

I have a server bound to localhost:7060. It is using ipv6 socket instead of ipv4. Below is netstat outout. # netstat -an Proto Recv-Q Send-Q Local Address Foreign Address State tcp ...
2
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1answer
830 views

Linux PPTP VPN and gateway woes

I have an Amazon Linux machine running in an Amazon EC2 instance. I am connecting to my office's VPN as follows: sudo pppd pty "pptp pptp.<DOMAIN>.com --nolaunchpppd --loglevel 2 --debug" file ...
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1answer
742 views

How can I route internet traffic via another computer to sniff the connection?

I need to do port forwarding on Windows 7. I have machine A that runs a program, which connects to the internet. I need to debug this connection, and I can't install a sniffer for checking the packet ...
2
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2answers
2k views

How to access a computer behind two NAT routers? [duplicate]

For technical reasons that I cannot change my computers at home are located behind two routers, only one of which (the one connecting my own network) I have control over. Basically the setup is ...
2
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3answers
337 views

How is an HTTP proxy different from a NAT box?

A host in a LAN with IP (10.0.0.1 TCP port 8888) connects to a server without knowing there is a NAT box at the network edge. The NAT box is dumb and just translates port 8888 to some other port 5555 ...
2
votes
2answers
480 views

How can I access an IPv6-only host from a Windows 7 computer behind an IPv4-NAT?

I have a computer with Windows 7. It's connected to Internet via an IPv4 NAT router. How can I access a host that is only accessible with IPv6? Is there an easy way to configure the Windows 7 Teredo ...
3
votes
1answer
93 views

How can I view different internally hosted websites, set up as virtual hosts?

I have an old machine that I've converted into a web server. I'm wondering what the best way to make the websites viewable on the internal network, without using a proxy. I experimented with BIND, ...
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4answers
2k views

setup web server behind a router

I want to turn a laptop with a broken monitor into a home web server behind a wireless router (buffalo airstation). I removed all ubuntu gui packages and installed lighttpd. The laptop has a fixed ip ...
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2answers
1k views

Redirect subdomain to internal IP

I have a Fortigate 80C at home and have a number of servers hosted: mail, git, web, RDP, voip etc. Now I want these subdomains to redirect to certain internal IPs: mail.domain.com > 192.168.0.200 ...
2
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2answers
270 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 ...
0
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2answers
257 views

NAT Helper for HTTP

I'd like to expose a Web server available on an intranet (local IP address behind a Firewall + NAT) to another client on Internet or different LAN. Since I can't do anything on the firewall (ex. ...
3
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1answer
655 views

Redirect Port on Mac to VMWare

So...I have started working as a front-end developer in a shop that does .NET. I use a Mac and have a VMWare image with Visual Studio and the project on it. The project runs great. However, I was ...
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2answers
3k views

SSH connection between two behind-nat computers through third public-ip computer

I have a computer at home (home-server) that runs irssi, rtorrent etc. My ISP is blocking every traffic from outside (dumb, I know, but it's the only ISP I can have). I want to be able to log in into ...
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1answer
503 views

Shorewall NAT problem

I have installed and configured Shorewall with two ISPs. I want to provide Internet access to the clients and the other connection for servers connection and NATs. I can navigate both from the ...
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2answers
573 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 ...
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1answer
668 views

Linux router frequently drops connections

Until a few months ago, I had my Linux desktop serving double duty as a router for my home network, and all was well. Then I set up a small Linux machine to act as a stand-alone router, and since ...
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2answers
499 views

Firewall in front of device with public IP address

Is it possible to have a firewall in front of a device with a public IP address without getting in the middle of NAT? I have a server that I need to put on the internet, but I want to put a firewall ...
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0answers
68 views

NAT through VPN

I'm currently trying to access a resource located inside a VPN. For development purposes I need to use programs I don't have on the laptop that connect to the VPN and - for reasons that still escape ...
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2answers
96 views

Translating an IP Address again

I have a question about NAT(Network Address Translation). is it possible to translate an already translated IP address? would you please guide me why it is possible or impossible?
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3answers
9k views

Bridged vs. NAT: a Virtualbox and VMWare Comparison

I installed VMWare Workstation 7.1.x and Virtualbox 4.0.8 on two different hosts, so I could compare. I set the virtual network adapter on both to NAT, which was successful for both. The result: ...
5
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1answer
511 views

Rackspace Firewall/Gateway Setup

I have rackspace account and wish to have this sort of setup: Firewall/Gateway eth0 - Public IP (56.X.X.X) eth1 - Private IP (10.X.X.X) Ubuntu 10.10. Accepts connections from the internet and ...
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2answers
3k views

Can't access vm from other computers in the network

HOST OS: windows 7 64 Guest OS windows server 2008 32 Vmware Worstation 7.1 Network Connection Type: NAT I can access my application from the guest os using the computer name or localhost but if I ...
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1answer
115 views

route packets for 2 eth's

I have 2 ethernet cards on my 1st computer eth0 10.1.1.254/24 eth1 10.2.1.254/24 eth0 is connected to 2nd computers eth0 using crossover cabe which is 10.1.1.1 I can ping computer 1 eth0 from ...
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1answer
859 views

Network problems after installing text-only Fedora 14 using VirtualBox

A small background. I've just subscribed to virtual dedicated server running Fedora 14. But before starting to setup it, I've decided that it is a good idea to try all installing/configuration on my ...
0
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1answer
779 views

How to NAT DSL modem to a LAN computer?

I'm using DSL modem manufactured by Billion (China, i think), i have 2 computers sharing this modem. Now, I have a domain and want to A the domain to my modem's IP, however, when opening this IP, ...
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4answers
640 views

Running a server when all computers have the same WAN ip

I want to run a server on my machine so that anyone in the Internet may connect to it. But my Broadband internet provider issues the same WAN ip to all the customers while each of them has a different ...
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2answers
3k views

Setting up a Linux server with a public Static IP

I have setup a Ubuntu Linux server in an office. It should have a public IP so that outside users can access the internet. Currently, it is set with a public IP, but is it supposed to have a local ...
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3answers
1k views

How can my router have the same MAC as a computer in the LAN?

My ISP refused to give out a new IP when I switched from just having one computer in the LAN to using a router in spite of me doing a few releases and renews. So I tried an a little unorthodox ...
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5answers
12k 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 ...
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2answers
126 views

Two easy networking questions

I have basic understanding of networking, but I just want to know to more thing I don´t understand. So, I have 1st Router, which is connected to DSL/Router and than internet. So my structure is this: ...
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0answers
138 views

peer to peer software vpn solutions?

Looking for a software based way to create a vpn for sales guys that will automatically reconnect if dropped (setup pptp dialin for moment but doesnt autoreconnect). I'm aware of Hamachi which is ...
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2answers
464 views

Why already set NAT info in router but not working?

I'm using ADSL service from ISP. The ADSL modem has only 1 LAN port and that port is connected to my PC. The LAN IP of my computer is 192.168.1.100, and I have apache running on localhost ...
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3answers
731 views

Remote socket connection C

I wrote a simple server application in C. I managed to establish a connection using telnet. The problem is that I cannot reach the server if I specify public instead of local ip in telnet. I mean this ...
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3answers
532 views

Why is port forwarding necessary for servers but not for clients?

Whenever I host a server, I'm required to forward the listening ports of the server on my NAT device. However, if I connect to a remote server, I won't be required to forward the port used for ...
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3answers
770 views

setting up the D-Link modem as a router

I have 5 computers and 1 D-Link modem that is connected to Bezeq (the infrastructure provider) All the computers and the d_link are connected to the switch. Currently only one computer is connected ...
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2answers
301 views

how to connect to my home computer when i was at company

i want to connect to my home's computer when i was at another place .but my home's computer is behind a router.and i can't set the router , cause it is not my. any way i can let my home's computer ...
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1answer
478 views

Need to connect to virtual box guest from host

The guest is a NAT device. From Ipconfig I can have an ip adress but I can't ping it from the host. do you have some ideas on how to connect to virtual box guest from host ? Host OS: 2008 windows ...
0
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1answer
890 views

Wireless router setup for 1-1 NAT

What I have: A linksys router WAG160N with firmware version 2 A "pool" of 5 external static IP's provided by my ISP 213.xx.xxx.n All the required configuration values for the static IPs such as ...
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0answers
680 views

After NAT how to setup VPN in windows server 2008 r2?

We have one windows server 2008 R2 with about 10 Hyper-V virtual machines. We've used wizard that comes when you enable RRAS to setup NAT, so that virtual machines can connect to internet (and to ...
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840 views

How can I port forward with an airport extreme and a NAT enabled modem?

I run an Actiontec HD701D modem with NAT to an Airport extreme base station to laptop etc. As you might expect I get double NAT issues. I tried a lot of different things to forward a port, but no ...