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

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How do clients identify the router on a network?

How do clients connected to a LAN network with a NAT router connecting the network to the internet, identify the NAT router and hence know where to send their traffic for the wider internet. If this ...
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1answer
72 views

port forward in INPUT level

I want to change the destination port of the ipv6 packet in the INPUT level. So I tried to use ip6tables with nat in the INPUT level but seems this command does not work # ip6tables -t nat -I INPUT ...
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1answer
3k views

pfsense with 4 WAN IP and outgoing NAT

I have a pfsense with a single wan ip, i want to assign multiple wan ip's. The pfsense machine is located on a vm machine with the other servers i wish to NAT forward. I want to give each server a wan ...
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4answers
348 views

Point of subnets

This page gives two options for if you have more than 254 hosts, get another IP range or use subnets. But if you've got an IP address range which lets you have more than 254 hosts, why not just keep ...
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33 views

Linking 2 Linksys Wireless G Routers to have 2 separate networks

I am creating a lab for a group of people and I want to perform a miniature netwars. My plan is to have 2 wireless routers that the two teams can gain access to their respected router. How do I link ...
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1answer
47 views

How to enable miredo UPnP-Enabled Symmetric NAT Extension

I have linux mint and miredo installed on both machines. Both machines are behind symmetric NAT. Routers have UPnP enabled. Does miredo support upnp routers? How to enable UPnP-Enabled Symmetric NAT ...
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2answers
57 views

link machines which are both behind NAT via ssh tunnel

I have two machines. both behind NAT. Also I have access SERVER from each machines. Is there way to do ssh tunnel from machine1 to machine2 via SERVER? Client machines are linux mint. SERVER is ...
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2answers
2k views

Setting up DHCP and NAT on apple extreme with Virgin Media SH (APPLE)

I'm currently going mad trying to get my Apple Time Machine to be the DHCP and NAT Server. I've turned off DHCP in the Super Hub config and turned DHCP and NAT on in the Time Machine. Doing this, I ...
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3answers
98 views

Routing to sub network with local DNS

Short and clean question We has domain that can be resolved and accessed from internet as ip. On host with that ip we has NAT and virtual machines that hidden behind that NAT. How can we give access ...
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2answers
36 views

NAT how to configure with a VPN

Good morning, I'm in trouble. I need to be able to connect to my Windows PC (not locally) and I cannot open my router ports (my internet provider doesn't let me). So I've been thinking on creating a ...
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433 views

Zyxel Router Static IP setup

I need assistance with a static ip setup. The router is set up with the details for the static IP and the computer is able to browse the Internet and able to ping the static IP. The problem that comes ...
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31 views

Manage NAT using a tool

I have a Raspberry Pi on which I had previously installed Raspbian and am now installing another version on again. It is mainly used to be a test maschine for small programs and primarily as a NAT ...
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106 views

Why can't my second router (in DMZ) automatically find DNS settings?

I'm trying to set up my own router after the ATT modem/router combo. There is no bridge mode to bypass the ATT router. So I set up the DMZ to point to my personal router and wasn't able to get any ...
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1answer
153 views

How to reliably set up communication between the VirtualBox guest OS and host OS?

I have a VirtualBox (Windows 8 guest on a Windows 8 host) with NAT networking set up. I would like to set up the guest system to emit Growl messages that would be picked up by a service on the host. ...
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0answers
146 views

Internet gateway device protocol support?

As far as I understand, applications that need to transfer data across network address translators in a peer to peer fashion, like BitTorrent, usually rely on the UPNP IGD protocol to ask the router ...
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1answer
115 views

Accessing web service on routed (without NAT) network

I have network topology where I use two routers: R1 and R2. R1 has NAT enabled because my ISP allows only to connect one IP. R2 has NAT disabled because I'm planning to extend my network in the future ...
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2answers
328 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 ...
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188 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
58 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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403 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
111 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
84 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
154 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
211 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
577 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
465 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
554 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
263 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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238 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
421 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
57 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 B:...
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121 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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120 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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51 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
1k 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
414 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
374 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 this,...
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1answer
270 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
520 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
514 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
60 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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0answers
408 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 (5.9.100.1)...
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62 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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2answers
54 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 ...
2
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1answer
495 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
309 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 ...
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1answer
61 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 ...