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

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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
363 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
539 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
108 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
296 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
328 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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0answers
29 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
118 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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1answer
494 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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1answer
28 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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2answers
182 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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1answer
394 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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1answer
212 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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1answer
291 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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3answers
3k 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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1answer
303 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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1answer
451 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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3answers
814 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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1answer
409 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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0answers
76 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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1answer
454 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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49 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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0answers
153 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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0answers
363 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 ...
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1answer
1k views

RV130 won't pass http unless behind another NAT

I'm attempting to replace a Linksys WRT54G with a Cisco RV130 for a home internet connection. For the moment, the setup is about as simple as it gets. Cable-modem -> RV130 -> Switch -> Multiple ...
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1answer
99 views

iproute2: How do i connect one machine to the internet via another

I have the following setup: A > 169.254.8.125/16 <--(ad-hoc)--> 169.254.9.109/16 < B > 192.168.178.21/24 <--(wifi)--> 192.168.178.1/24 < AP/router > internet I want to connect A to the ...
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1answer
354 views

How to NAT between 2 network interfaces without impacting routing

My Linux-based router has 5 Ethernet ports. It is currently acting as a router between ports 1 & 2 and the dedicated WAN port, without NAT. Port 1 is 192.168.1.1/24, port 2 is 192.168.2.1/24, WAN ...
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1answer
248 views

VirtualBox NAT port forwarding configuration (<1024)

I'd like to forward requests from 127.0.0.1:80 to a guest OS in VirtualBox VM (CentOS 7) - 10.0.2.15:8080. Is that possible? If I forward 127.0.0.1:9090 everything works fine, but as soon as I ...
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1answer
46 views

NAT and UDP replies by default

If I send UDP packets from Machine A with local port M behind a NAT to Machine B's port N, where Machine B is outside the NAT (elsewhere on the Internet), can I reasonably expect that NAT would pass ...
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1answer
194 views

iptables does not seem to be applying SNAT to packets sent on a raw socket

I'm writing packets from a user space program to my wireless interface wlan0. I've set up a SNAT rule with iptables as follows iptables -t nat -A POSTROUTING -o wlan0 -j SNAT --to 192.168.1.3 And ...
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195 views

Disable NAT and have a direct WAN - LAN connection with just one PC?

I have a pretty old router which is behaving rather weird with UDP port forwarding (Seems to be blocking/not routing incoming connections). I need it to behave such that the cable is directly ...
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38 views

Trying to figure out NAT between modem and router

I just bought a new DSL modem and I'm trying to set it up optimally for my small home network. There are a few computers and smartphones which access the router which handles ethernet and Wi-Fi, then ...
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736 views

Setup router with 2 seperate LANs, one that pipes thru VPN, one that doesn't?

I use a VPN at home for privacy, but there are times where you do want your true public IP to be known. Like for Google Maps, or pizza. I currently use a software-VPN tool on my computer for this, but ...
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2answers
250 views

Switching to IPv6 - Do I need a router? [closed]

In the future, since every IP (IPv6 adress) is going to be global, we don't need to use NAT. So basically, why do I need a router on an IPv6-only global network? Why not just replace my router with a ...
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1answer
97 views

How to forward a port in VM which is behind NAT

I see a few questions similar to my but, they didn't answer my question. I have a router. I have installed Debian in VM and setup a ssh server on it. I want to forward a port for this machine on my ...
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1answer
787 views

SSH and PWNAT for SSH Connection Between Two Separate NATs

Is it possible to use pwnat and SSH to establish a "peer-to-peer" SSH connection between two machines that are behind two separate firewalls/NATs? If this is possible, what are the steps that would ...
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1answer
82 views

Windows wireless bridge with NAT

Here is my setup: I have a robot that I want to access remotely, but there is no wired connection. If the robot was configured to DHCP, I think could bridge the wired and wireless connections on a ...
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1answer
541 views

How to re-enable NAT on Netgear CG3100?

I just accidentally disabled NAT on my CG3100. Now I only have 4 public IPs for all the devices. I really need to re-enable NAT on my CG3100. How do I re-enable NAT on a CG3100?
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476 views

port forwarding in windows 7 to vmware

I have a windows 7 in a network with ip 10.1.1.74 and I have vmware with centos which it's ip is 192.168.160.129 and has configured as NAT with my local windows 7. I have set up a apache httpd server ...
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1answer
112 views

Double NAT with access to both gateway web interfaces

I have a Cisco Linksys E3000 home router that I appreciate. However, my new (but temporary) ISP will want me to use their Huawei router for their service once I get connected next week. This creates ...
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1answer
1k views

Switch with NAT/port forwarding?

I'm sorry for this basic question, but I'm stuck. I'm looking for some networking equipment that allows me to route WAN traffic (internet) to a client on a local LAN based on TCP/UDP port. That is, ...
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1answer
95 views

Why from a virtualized Ubuntu system I can't discover the ip address of my router?

I am not into computer network and I have the following problem finding my router IP address. I have a Windows 8 PC on on which it is installed VmWare Workstation that virtualizes Linux Ubuntu. The ...
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1answer
72 views

How can I specify which network to use for internet connection and which for viewing network computers

I have two Network Adapters on Windows 7 64 bit operating system which is installed on Oracle Virtual Box. I created those two adapters as follows: NAT VirtualBox Host-Only Ethernet Adapter If I ...
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1answer
624 views

How can I bypass my modem with NAT to open my ports to the outside?

My Internet provider gave me a Modem-Router with WiFi capabilities but it has all ports filtered for incoming traffic. What I'm trying to do is to use NAT in someway that allows me to recieve incoming ...
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1answer
95 views

Connect to internet through two gateways

I am developing a library to perform port forwarding in NAT devices. Using SSDP (de discovery process) I can see two different UPnP servers that implement WANIPConnection service type, one is my ADSL ...
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1answer
801 views

Where to place a port-mirroring switch for home network monitoring

I want to start monitoring traffic that goes in and out of my home network. I'd like to collect information like bandwidth usage and (specifically) HTTP requests from home computers to websites. From ...
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2answers
848 views

How can i find the ISP IP allocated to my Router?

I am using Router to connect to internet. How can i find the ip address allocated to my router by isp in windows 7? I cant use whatismyip.com since it will give shared ip if i am behind a CGN.
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0answers
424 views

How to expose local loopback to (VirtualBox) VM connecting to host via NAT (VirtualBox NatNetwork)

I'm using the VirtualBox NatNetwork type to connect most of my VMs to the host (with the required ports set up for forwarding). I'd like to know how I can connect to the local loopback ("localhost") ...
2
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2answers
162 views

Port based routing, 1 public mapped to multiple private ips

Simply put, I want this single public ip mapped into different private ip's based on port 111.1.1.1:80 -> 192.168.1.1:80 111.1.1.1:443 -> 192.168.1.2:443 is this a standard and possible?