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

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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
81 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
110 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
3k 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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8k 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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5k 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
75 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
1k 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
766 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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1k 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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90 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
88 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
1k 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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358 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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1answer
311 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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141 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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74 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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2answers
131 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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1answer
179 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
2k 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
2k 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
312 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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986 views

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
324 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
308 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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264 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
257 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
4k 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
360 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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37 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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113 views

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
5k 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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1answer
224 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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2answers
305 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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1answer
183 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 ...
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159 views

How do I put a computer outside of a NAT, giving it a separate IP address?

I have two servers running behind my D-Link DIR-655 NAT router. Obviously, I cannot allow outside access to both of them simultaneously without putting them on different external ports, which I don't ...
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172 views

How to use comtrend router to create NAT and use same public IP for all LAN devices

I think the title says it all. I would like to use my Comtrend router in a way that all devices connected to the router (ethernet and WiFi) use the same public IP for going to the outside world. Is ...
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372 views

How to access Ubuntu running Openfire from the Internet (Public IP)?

I have Openfire installed in my Ubuntu server using port 7070. Now using ipchicken I found my public IP (example: 111.11.000.0/7070). When I try connecting from another PC through connected to the ...
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1answer
384 views

OS X natd, nat between en0 and tap0

I'm trying to connect a tap0 and en0 interface with the natd. The (simplified) background is: I have one application running on a smartphone and a simple UDP Server running on my laptop. The UDP ...
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1answer
309 views

How can I troubleshoot vmnet routing on my MacOShost and Linux guest with VMWare Fusion?

I am running a Linux guest VM on my Mac (MacOS 10.7.5) with VMWare Fusion 5.0.3. The Linux guest VM expects to have a specific IP address - 192.168.56.10 The VMs network is set to be NAT ("Share ...
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169 views

UDP NAT punching for linksys wrt54g

I could not explain the strange NAT behavior, hope someone could help: I have a linksys wrt54g router at home. Client sends UDP keep alive packet from 192.168.1.20:16688 (nat outside public IP/port ...
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1answer
81 views

Simple program to turn a server into a client and vice-versa?

What would be a simple to use program for Windows that would do the following: Computer A unknown TCP client wants to connect to computer B's unknown TCP server. Both are behind a NAT. Computer A ...
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291 views

How to block a particular computer behind a NAT

I run a small hostel and have the following network configuration: Router1 (192.168.1.1) ─┬─ (192.168.1.2) Ubuntu Samba+SSH Server ├─ (192.168.1.X) Router 2 (192.168.2.1) ─┬─ ...
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2answers
917 views

VMware multiple guest systems with own VPN

I'm trying to set up a Linux box that runs multiple Windows guest systems in VMware, all of which connect through the host internet connection through NAT, but each guest using its own VPN connection. ...
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1answer
446 views

ddwrt not relaying external ip addres in from an external request

I have a problem where all external requests are logged or interpreted like they are originating from the router as the log shows shows the routers ip rather then the originating clients IP. I'm ...
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2answers
542 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 ...
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1answer
1k views

Accessing port forwarding service from inside the network

I am running Zentyal as gateway on my network. My domain points to public ip on external interface of zentyal server. I have setup port forwarding on my zentyal server to forward all incoming traffic ...
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25 views

Can we capture the incoming packets of a TPLink router? [duplicate]

I wonder if we can capture the incoming packets of a TPLink WR340+ router. We want to check all packets from some specific IP. Is it possible? Steve Peng More information: ...