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

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DD-WRT: Remote SSH access doesn't work when OpenVPN client is enabled

Problem description 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 ...
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15 views

How can I tell if my NAT Gateway is a Full-Cone NAT (one-to-one) or a Restricted-Cone NAT?

Since a Restricted-Cone NAT blocks incoming packets from sources which I did not sent a packet to first, I feel as if it is more secure, unlike a Full-Cone NAT. However, I am not sure what my NAT ...
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17 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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11 views

Is NAT affecting my Internet connectivity, public IP 2 routers back to back

I switched from cable to phone company, they gave me a ADSL router and I wanted to use my existing router and didn’t want the Direct TV and television plugged into my home network. I got a publicly ...
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32 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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41 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
22 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
36 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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20 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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15 views

Iptables Port Forwarding To Different IPs Based on Port

On a CentOS 6 server with an IP address of 172.16.1.10, how can I configure iptables to route traffic destined for 172.16.1.10:80 to 192.168.1.10:80, and traffic destined for 172.16.1.10:8080 to ...
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22 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
69 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
14 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 nmot get ...
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29 views

Redirect traffic destined for IP and port

I have a program that wants to connect to 1.2.3.4 on port 5678, but it can't because the port is blocked on our network. However, I do have an SSH tunnel set up that redirects localhost:5678 to ...
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14 views

virtual network setup for NAT?

Trying to test NAT traversal for FTP. For that I need to setup 4 VMs with 2 interfaces each. I was thinking of creating a virtual network & testing on that. what are the virtual network simulation ...
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1answer
74 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
25 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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1answer
82 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
68 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
46 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
59 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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34 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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35 views

Mikrotik Netmap to Windows server 2008

I have Mikrotik RouterBoard RB2011UIAS-2HND-IN as my router and Windows Server 2008 as DC. I want users outside local network be able to connect our chat server placed on Windows Server. Chat server ...
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66 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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133 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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22 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
24 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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14 views

nope connected by filezilla, but cannot get list when connected by linux CLI client

I built FTP server by VSFTPD, on Raspberry pi, and Inside NAT. Surely set port-forwarding and, it perfectly functional when I connected by filezilla. But, I can't execute LIST(dir) when I connected to ...
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1answer
182 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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28 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
34 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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35 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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1answer
54 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
149 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
75 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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74 views

DNS config for NAT with BIND

Over the past days, i installed CentOS on a computer that I'm using to mess around with system admin related tasks. What im doing is, I'm basically making this computer into a "super router" as i like ...
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86 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
27 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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39 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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16 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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67 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
65 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
32 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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70 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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63 views

Connections from virtual host to internet OK, but to rest of LAN, broken

In a notebook running Ubuntu 14.04 I have installed VirtualBox and created a virtual server with Windows 7. The PC is connected to a 192.168.x.y LAN. The virtual server is in a host-only network with ...
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87 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
43 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 ...
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1answer
79 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
69 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 ...
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30 views

Why is the TCP open but not the UDP?

I'm setting up a game server and I have a bunch of ports forwarded already (all in use). So I'm putting one into /etc/ppp/firewall-masq, which is full of iptables rules. The game server is served by a ...