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

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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 ...
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180 views

Public IP address port forwarding goes to my router's homepage and not my laptop’s server

I am trying to turn my laptop into an internal server to be accessed from anyone on the Internet. But whenever someone types my public IP address into their URL bar it sends them to my router’s config ...
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1answer
57 views

Custom nameservers over wifi hotspots with initial web login

I have built a portable router using a raspberry pi. My setup works, unless I connect to a hotspot that requires some kind of web based login. After some investigation, I think I've tracked it down ...
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368 views

Behind ISP NAT Firewall - Need to remotely monitor CCTV's

Here's my situation: I have a DVR which is capable of allowing me to remotely view my shop CCTV's over IP.However, I'm behind the ISP's NAT firwall and have no ability to open ports on the router, so ...
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2answers
105 views

If a port behind NAT sends a packet to a malicious host, can that host send packets to any open port, or only the port that sent the packet?

For example, a computer behind a NAT router uses Skype. Skype uses port 4000 to send packets to a server to establish indirect connections with other Skype clients. Since Skype had sent a packet to ...
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2answers
79 views

Change source IP of an incomming packet WIN7

I am receiving data through a specific TCP port and I would like to apply a rule on my Win7 Machine for my trafic (NAT??) : Every Frame coming from A --> Change Source Address to B & Every ...
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2answers
140 views

Port forwarding: how many routers between me and the internet?

I wish to ssh to a machine on my home network, so I intend to set up port forwarding. But how many routers are there between my home server and the external world (i.e. a global IP address)? I am ...
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1answer
196 views

Nagios configuration to monitorize virtual machine using Hyper-V with NAT

I will start by thank you very much for any help that i may possible have from any of you. I have a centos box that have nagios installed. I'm able to monitor several servers so far but I’m stuck in ...
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1answer
485 views

Is there any benefit in activating NAT loopback for basic video gaming? Does it help a PS4 use UPnP?

I have a router that I can turn on and off NAT loopback. The router is just used for game playing and phones and normal everyday Internet browsing. My question is this will there be any benefit to ...
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2answers
390 views

How do routers avoid port clashes when DMZ and NAT are used?

NAT in consumer routers makes the router translate a request from an internal device on a private IP (say dev0) and a specific source port X to a request from it's own public IP at a different source ...
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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, ...
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1answer
250 views

Need clarification for Sonicwall “Public Server” wizard NAS policies

I used the SonicWall TZ105 "Public Server" wizard to add NAT policies for an internal (non-DMZ) server, but I do not understand the need for all the Custom policies that resulted: # Source ...
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227 views

vagrant guest connection problems

I have VirtualBox 4.3.22 on OSX 10 with guest additions installed In VirtualBox I have: Vagrant/CoreOS guest vm in NAT networking mode with eth1 addr 172.17.8.101 Ubuntu 14.04LTS guest vm in ...
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1answer
386 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 ...
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2answers
55 views

NAT and UDP source port

My question is somewhat extending on this discussion: NAT and UDP replies Scenario: Machine A behind NAT Machine B on the internet machine A:Port M sends a UDP packet to Machine B:PortN Machine ...
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1answer
113 views

topology for an unmanaged switch (firewall)

I'm considering an unmanaged switch. My understanding is that many of these devices explicitly lack a firewall. In that case, what do you use as a firewall? I suppose one option would be to use a ...
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0answers
117 views

OpenVPN sans port forwarding on unfriendly networks

I have a problem. I'm about to move onto campus right in the middle of the semester. For a student, I have a complicated network setup where all of my systems are reliant on NAS and all of them VPN ...
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48 views

What is wrong with this description of NAT as it relates to home networks?

I gave the following description of NAT address assignment as it relates to home networks as part of an answer on stackoverflow. For more details the full stackoverflow question is here ... Your ...
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1answer
878 views

No data received (Error code: ERR_EMPTY_RESPONSE) when accessing goo.gl short URL

I have a strange problem. I cannot access a web via goo.gl short URL on any browsers (Chrome, Safari, Firefox). I'm on Mac OS X 10.10.2 The status bar will show "Waiting for goo.gl..." for 30 sec or ...
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1answer
374 views

VMWare: Linux host doesn't get NAT connection from Windows Host

I've been trying the last couple of days to get NAT networking to work. I am running VMWare workstation on Windows 7, and installed an Ubuntu image. The image starts up fine, but the vm does not get ...
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1answer
356 views

Securing remote access to local server behind NAT router

I want to remotely access a Linux server in my private local LAN via HTTPS and SSH. The server ist connected to my DSL router (German Fritz!Box). As I can't directly access my server because of ...
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1answer
249 views

slow internet access when routing via a server (both using iptables NAT and ssh tunnelling)

I have a spare computer powered by a dual core intel atom N550 CPU and 2GB RAM (I will refer this as "the server"). It is running lubuntu 14.10 x86 (32 bit) with lightdm service disabled (hence, no ...
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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, ...
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2answers
477 views

Router to Firewall to Internal network NAT with Single Public IP

In an effort to learn more about networking I have picked up some old Cisco equipment for home use. I have a 2811 router, a PIX 515e firewall, and a switch (don't remember the model). My incoming ...
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1answer
474 views

Can't find other computers in network when using NAT in vmWare

I have created a Windows 7 VM using vmWare Workstation 10 on a Windows 7 host computer. The host computer has three LAN connections. The VM accesses two of them via bridged networking, which works ...
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1answer
2k views

Forward a port to all users in Mikrotik RouterOS

In short: I want to know how to forward certain ports on Mikrotik's RouterOS. I looked up online and found several videos/tutorials but for whatever reason, I cannot do it. Please read below for more ...
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1answer
59 views

Will a NAT router try to talk directly to a device on its subnet or only through its gateway?

I know that this is pretty ambiguous because many factors contribute to how traffic is routed but is it expected behavior that when clients on a NATed network try to send a packet to an address ...
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391 views

OpenVPN on Windows: clients don't see network behind server

I set up my openvpn server on Windows 7 pc. Client is connecting to server succesfully, so my port is forwarded to openvpn server. I'am able to ping 10.8.0.1 address from client. And that's all, but I ...
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2k views

ESXi + pfSense - NAT forward management interface ssh

question at the end. Situation: (ips replaced by fictive examples) I have a (remote) dedicated server, with 1 NIC, 2 IPs. One IP (eg. 5.9.1.1) is bound to the physical NIC's MAC, the other ...
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58 views

VBox NAT Network VPN

I wasn't quite sure whether to post this in a networking forum, or here, but I chose here since it is more software related rather than networking related. Basically, I want to be able to remotely VPN ...
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53 views

connect from one workstation to another that is on a different IP range?

This is my setup below. Router A is the main router. I am on workstation 1.100 (that gets an IP from Router A via DHCP). Router B has an ip with 10.1 at the end but gets the "internet or WAN" via ...
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1answer
473 views

Can not access to public IP from inside network

I have a home network with a router that serves as a gateway for internet access. Within this network I have a server with many services, all mapped inside the router with DNAT. When I access the ...
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1answer
274 views

Connecting to Apache server over SSL when it's behind NAT and the public IP & port are known?

I want to connect to an Apache server over SSL (with both client & server certificates) when both the client and server are behind NAT firewalls. I can't port-forward and I have to assume that all ...
0
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1answer
60 views

Can not connect home network devices from internet // Cablecom deferring my requests

I reciently moved to Switzerland. I was trying to set my home network configuration as I'm used to (SSH Access to my box, VPN Server, ...) I did the configuration on the router and I was even able to ...
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1answer
87 views

Accessing site running inside the Guest VM (Ubuntu LAMP) webserver running over Max

I'm running Vmware Fusion on a Mac (host) inside which I am running VM (Ubuntu + LAMP) hosting sites like say example.com (and few other sites). When I try to access example.com from inside the ...
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2answers
273 views

NAT traversal of VPN/proxy server in home network with no access to the router

I want to setup a VPN (or proxy) server on my workstation located outside my permanent residence and behind NAT. I need to use workstation's network IP. The problem is I don't have physical nor ...
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2answers
2k views

How to disable NAT and still have internet connection? (I have IPoE not PPPoE)

Basically NAT is being a huge pain in the ass for me because the tiny NAT table of my modem/router keeps filling up all the time and then I can't get any packets through for several minutes (this ...
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1answer
2k views

How to test whether a router supports NAT loopback?

I've been unable to find much information on whether my router (Linksys EA4500) supports NAT loopback, so I'd like to perform a test to tell me whether accessing my external ip address from within the ...
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1answer
351 views

Plivo SIP problems with NAT traversal

Ok, I've looked and looked, and can't seem to find anyone that's written about this problem. I have a simple office setup where there are two SIP phone extensions (Polycom 331) behind a Sonicwall ...
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1answer
42 views

where is NAT adapter on virtualbox

On my Ubuntu 14.04 guest in Virtual Box when I set the connection type to “Host only Adapter” I can set the IP address of vboxnet1 to what I want. But I do not know where is NAT adapter? Or better to ...
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1answer
749 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 ...
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20 views

Simultaneous Internet Access on two hosts issue. Is it caused by NAT? [closed]

Sometimes I have troubles with Internet access on my PC while other person connected to the same LAN is using Internet simultaneously. Webpages loading is way too long or it just breaks. I suppose NAT ...
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205 views

SSH Reverse tunnel assistance with application

Well it does in a way. If I do something like: ssh -R 27011:localhost:25566 USER@NAME.COM -p 27010 NOTE: substituting the real username and domain with USER@NAME.COM for security. NOTE: The port for ...
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1answer
675 views

NAT several subnets with same IP range to a single interface

I have the following problem: a customer have several LANs, for example LAN1, and LAN2 with the same private IP ranges (192.168.10.x), and I need to monitor all the networks. I have name three ...
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1answer
92 views

Why IPSec ESP needs NAT-T

I understand why it is not possible to use IPSec AH over a NAT server, since the IP header is included in the MAC too. But I am confused about ESP with Authentication (I am talking about tunnel mode, ...
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1answer
345 views

How to experience UDP hole punching using Ncat under Linux?

I'd like to see UDP hole punching in action. I tested it under Linux, using Ncat. Here's what I tried: Open port 1234/UDP on host A and port 12345/UDP on host B's firewall (I'm still behind NAT, but ...
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2answers
527 views

Multiple network interfaces with the same local IP address

I run several VPN connections that give me different external IP addresses. But these VPN servers often give me the same local IP address. So I can end up with the following configuration: eth0 ...
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1answer
106 views

Multiple VNC servers behind a NAT

I need to remotely access 100+ work computers (Windows XP, Vista and 8). The PCs are all on the same local network, their dynamic IPs set by DHCP. They're behind a NAT and the public IP address is ...
0
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1answer
289 views

Getting IoT devices to connect to an authenticated wifi network

I have several Internet-of-Things devices such as the Intel Galileo and Raspberry Pi. I'd like to connect these up to the internet obviously, because without it they're just things. Unfortunately my ...
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1answer
325 views

Virtual servers not forwarding when DMZ set in DLink 2730B

My router is a DLink 2730B. The target machine IP is 192.168.1.6. I’ve applied DMZ Host to this IP, and have configured on 'Virtual Server' the following settings: Port 21 on 192.168.1.6 is ok, I ...