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

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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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69 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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199 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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378 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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23 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
31 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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20 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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232 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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68 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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38 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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44 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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75 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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270 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
226 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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129 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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128 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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28 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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64 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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18 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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89 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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92 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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42 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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100 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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83 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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154 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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48 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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125 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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100 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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33 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 ...
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25 views

Preserve NAT mappings across reboot

My Linux router is able to reboot and reconnect all network interfaces pretty fast (~10 seconds, thanks to systemd and a SSD disk), and comes up with the same IP addresses. Unfortunately the reboot ...
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1answer
44 views

Filtered port with virtual server setup on a NAT

I have a Symphony SY602 ADSL router and I want configure a dynamic DNS to access my system remotely. I made a NAT virtual server in routers configuration and this is what I configured: Server Name ...
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303 views

OpenWRT NAT only for clients on certain WLAN network

I am using an OpenWRT powered WLAN router as an access point for my network. Everything on the network id run through a PFSense box so that I can have full control from there. I would like to have a ...
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19 views

How to find NAT responce port

Does NAT work as follows? My computer 192.168.1.5 sends a request on port:5555 (for example) this request goes to my router 194.564.23.67 (public ip) the NAT then changes the port and forwards the ...
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43 views

MASQUERADING a veth

I want to bind an application to a wifi interface that might loose connection and receive a new DHCPed IP on reconnect. The problem is that the application can only be binded to an IP address and not ...
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88 views

How to IPv4 through IPv6?

My ISP (Unitymedia Germany) tunnels IPv4 traffic through slow and unstable CGNAT (they call it "AFTR", which seems to be a similar thing) but comes with reliable and native IPv6. Now, is there any ...
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138 views

Cannot ping or ssh from lan to virtual machine

I have next setup: My home lan = 192.168.1.0/24 My virtual lan = 192.168.207.0/24 My laptop = 192.168.1.109 (dhcp OS=Windows7) My desktop = 192.168.1.206 (fixed ip OS=Windows8) My virtual machine ...
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108 views

Accessing two devices with the same IP?

I want to connect my laptop to two WiFi enabled digital cameras, that have the same IP hardcoded: 192.168.1.1 One solution that I've successfully tried: Connect one device to the laptop's built in ...
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57 views

How does NAT Work on the Packet Level?

So I am studying for my Network + and CCNA and had some confusion about how packets work. I was reading a similar topic at How do IP answer packets reach their destination inside of a private LAN? ...
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641 views

How do I properly SSH into a server behind a NAT while maintaining the tightest possible security?

I have a VPC in Amazon AWS. There's a NAT Server running in a Public Subnet that connects to an Internet Gateway. I have a bunch of servers running in various private subnets within the VPC. I'd like ...
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143 views

Does NAT forwards ping requests and port scans to all subnet computers?

If I ping some friend's public IP address, this is usually the address of his router. Does the router forward the ping request to all devices on it's network? If the devices are all turned off will ...
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247 views

BitTorrent seeding despite UPnP and NAT-PMP being turned off

Using Deluge BitTorrent client and being behind two NATs (home router + ISP router), I've turned off both UPnP and NAT-PMP and let it seed one completed torrent, observing the behavior. To my ...
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242 views

Can a VMWare player virtual machine receive udp packages?

I have a virtual machine running in VMWare player v6. The network type is NAT. An application in my virtual machine sends UDP packages to a server in the network of the host machine and needs to ...
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36 views

NAT on LAN interface

I have set up DDNS and it is working fine. The router is D-Link 2750U and I could not see any NATting option on the LAN interface. However, I wish to cut short the trip to the DDNS server when I am ...
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1answer
134 views

Conntrack gets incorrect forwarding rules for outgoing protocol 41

I'm trying to forward protocol 41 (ipv6-in-ipv4) for an HE tunnel through a WRT54G running Tomato 1.28. Tomato 1.28 is running a 2.4 kernel that knows absolutely nothing about protocol 41, except that ...
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66 views

Are WAN Source rules checked after masquerading happens?

We are trying to do traffic shaping in pfSense, and we are having a hell of a time trying to convince pfSense to match the traffic. For example, if i create a WAN rule to log all traffic destined to ...
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55 views

Internet connection dropped when nat created and routed via vpn [linux+iptables]

I've got a very frustrating network issue. Currently I'm living in a hotel in which I need to authenticate through a website in order to obtain internet access. I've also got xbox360 that I want to ...
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155 views

Can only connect to uTorrent WebUI when on local network

My port forwarding is all set up, I can connect to WebUI hosted from my laptop with my phone but only with my LAN IP when I'm on the same network. When I try to use the public one (WAN), I can't get ...
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30 views

Special type of DMZ?

So I have a standard modem-router setup all great to go, my Modem gives an IP Address from my provider via DHCP according to my Mac address. All is good. However, I now want to expose a new virtual ...
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63 views

Point an internal IP address to an external URL

Is it possible to set a router up so a machine in the LAN can access an Internet URL using an internal IP address? I have a cheap DVR box that can save recorded videos to a FTP server, but only ...
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193 views

OpenWRT sending invalid packets to WAN when Android phone connects

I have a Netgear WR703N wireless router flashed with OpenWRT 12.09 "Attitude Adjustment" connected to my school's Ethernet network, and our IT department sent emails alerting me that it's ...