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

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How to share folders b/n VirtualBox and Win 7 using NAT adapter and Samba

When I had my Adapter set to Host Only I followed this tutorial and was able to view the folder # \samba\share\ only buy typing \\192.168.55.444 in my windows start up. So, this means I could share ...
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1answer
3k views

Accessing VirtualBox with NAT adapter using SSH

I have a CentOs 6.5 running on a VirtualBox. I am using NAT adapter and my inet addr is 10.0.2.15 But, I can't access this host using ssh root@10.0.2.15 I get ssh: connect to host 10.0.2.15 port 22: ...
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1answer
643 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 ...
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1answer
100 views

Computer only accesses the internet when using a static DNS ip

My setup is wall-> Zyxel p-870h-51a VDSL2 modem -> DD-WRT router. The issue is that the modem has connected to the internet, but the computer is unable to. This is resolved if on the individual ...
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38 views

Blocking an outbound port for a bridge'd nat'd inteface

eth0 and wlan0 are bridged to br0, and have access to the outside world through eth1 and NAT. I'd like to block an outbound port on wlan0, but leave it open for eth0.
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1answer
133 views

packages from router dont match iptables dnat rule

I have the follow rules to forward port 443 from external to a internal host: IF_INET=ppp0 IF_INET_IP=1.2.3.4 # Router External IP IF_LAN_IP=192.168.0.1 # Router Internal IP ...
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2answers
3k views

No internet connection in Virtual Machine on selecting NAT in VMWare workstation

I'm facing this strange problem from yesterday where if I select NAT as the network adapter in VMWare, I'm not getting any internet connection in the VM. I have a requirement where I have to have the ...
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1answer
1k 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 ...
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1answer
382 views

Odd packet loss through NAT with two WAN interfaces

I have got a Linux server machine which I also use as network gateway / "router". It has three network interfaces active – two network interfaces connected to the internet over different ISPs and the ...
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1answer
248 views

Editing IPTABLES nat rule in cron job

I am sitting here with an issue: I need to switch the source interface for iptables' NAT rule at a given time. I want to basically do soemthing like this - caution: concept code: #!/bin/bash if [ it ...
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2answers
154 views

How To Obtain IP from Public Wireless Router and Share via My Own Private Wireless Router? [duplicate]

I live in an apartment with a public wireless router which requires you to log in via a splash-screen page. I want to have my own private wireless router which logs into the public wireless router ...
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36 views

Change current internet connection interface

I am at a dorm, where the internet is shut down at 11.30PM but I own a Vodafone dongle and I would like to automate the NAT setup, so that at 11.30pm, sakis3g is invoked to connect ppp0 to the ...
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1answer
963 views

With VMware Workstation, how can I SSH from the host to a guest with NAT?

My host is Windows 7 with VMware Workstation 10. I am running an Ubuntu 12.04 guest that is connected to an NAT network. How can I set up the network so that I can SSH from the host to the guest? I ...
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2answers
7k views

How to configure cable modem router to allow port forwarding to other connected router?

I recently got a new cable model that also acts as a router. I am not super thrilled about it, but this is what my provider gave me. My previous setup was using just a cable modem and my current WiFi ...
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2answers
4k 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 ...
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3answers
839 views

How to communicate with devices that have the same IP address

I have a situation where I need to communicate via telnet to multiple devices that have the same IP address. The context is that I am writing a "final test" of devices in a manufacturing facility. ...
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1answer
472 views

VMWare Fusion 6 Nat translation issue

I have the following network diagram, using VMWare Fusion 6 I am able to ping from the en0 interface on my mac to all of the 172.16 network, and on the custom linux kernel (2.6.x) base I can ping ...
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917 views

VirtualBox and Samba 4 on Linux Guest (NAT and Host Only)

Gentlemen, I really need a help from you to configure the "Samba 4" using the "Virtual Box". Here's the situation: In certain networks where I work, the Samba 4 works, in other does not. The guest ...
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1answer
83 views

Forwarding all traffic to other server with iptables

Assume I have a sever with X.X.X.X IP address and a web server with Y.Y.Y.Y IP address. How would I forward web traffic from X.X.X.X to Y.Y.Y.Y using iptables? My servers run Linux and use iptables
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1answer
71 views

How to setup my machine so I can reach my website from inside and outside my network?

I have a home web server and I cant access website from the external ip when inside my local network (due NAT loopback). Im trying to be able to seamlessly access my sites from outside and inside my ...
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2answers
762 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 ...
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1answer
531 views

Linux nat with a secondary ip address

I want to setup nat on a server/router with a multiple public ip addresses (on different subnets and with different gateways, but the same physical ethernet interface), using address A for all local ...
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1answer
2k 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 ...
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1answer
2k views

Forwarding all incoming traffic on eth0 to go to eth1

I am trying to setup my raspberry pi to sit between my router and my modem. I'm basically trying to set it up as an intercepting proxy so that all web traffic goes through the proxy. I have the ...
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1answer
915 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 ...
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1answer
4k views

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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1answer
115 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
690 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
33 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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1answer
284 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
122 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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73 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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3answers
41 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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32 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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119 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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1answer
3k views

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
1k views

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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1answer
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
192 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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1answer
450 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
224 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
878 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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1answer
3k 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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269 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
54 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
319 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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1answer
343 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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1answer
803 views

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 +---------+ ...