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

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2
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1answer
326 views

Virtualbox -> Can't add 2nd adapter to network for VM

I have a Debian Wheezy VM running in virtual box with the 1st adapter being NAT. However I want to also add a Host-only network but I can't add 2nd adapter to network for VM, it is grayed out. Any ...
0
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0answers
17 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 ...
2
votes
1answer
434 views

How to forward ports through ssh and nat to another machine

I have a problem when using ssh port forwarding and nat simoultaneously. Situation: Machine A runs a webserver on port 8080 Machine B is a raspberry pi which works like a little router. It has two ...
0
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1answer
19 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 ...
0
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1answer
24 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 ...
0
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1answer
2k views

Share local folder over Internet

How would I share a folder over the Internet and also have the machine on a LAN? The internet connection has a fixed IP. The purpose would be to host an Access backend. I know Access doesn't work ...
0
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1answer
5k views

Can't access my IP camera over the internet

I have an EasyN F3 (F3-M166) IP camera. It works fine on local IP address, but I can't access it over internet. This is what I have done step by step: I configured the local IP (camera_ip) and port ...
1
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2answers
5k views

Will disabling NAT on my wireless router cause a performance hit on my DSL router?

I have a Thomson TG508v2 router/modem and a brand new AirPort Extreme connected to it. At first, I set the AirPort Extreme to "share a public IP", which enables DHCP/NAT. Everything works great but I ...
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4answers
2k views

How to do port forwarding in D-link Glb802c?

I have some questions about port forwarding on my D-Link Router GLB-802C. For example: My local machine's IP is 117.1.1.81 My router's IP is 117.1.1.1 My Public (Web) IP is 117.16.1.1 My ...
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0answers
15 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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0answers
29 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 ...
4
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1answer
4k views

VirtualBox NAT over proxy

I use VirtualBox 4.1.8 on a Ubuntu 10.04 host system. I have an HTTP proxy server on the host system. How do I configure the VirtualBox to NAT the virtual machine's network and use the HTTP proxy for ...
2
votes
1answer
2k views

How to use NAT iptables rules for hostapd

My PC is equipped with two net interfaces - wlan0 and eth0. I want to use WiFi port as access point on wlan0. So i use hostapd facility and it works properly in routing mode in local network. Users ...
0
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0answers
30 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 ...
0
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1answer
18 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, ...
0
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1answer
2k views

Torrent upload ratio not updated on Synology DS212+

I have a Synology DS212+ NAS running DSM 4.2-3211 (current version). I use it for several purposes including torrent download using Download Station and a tracker that needs authentication. My ...
1
vote
1answer
23 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 ...
1
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1answer
5k views

Why is my connection refused when port-forwarding?

This question is related to this: Application / Device setup for remote network connections I have a 2wire 3801HGV router and I made some firewall settings to open some ports on one of my connected ...
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0answers
34 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 ...
0
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2answers
42 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 ...
0
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1answer
25 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 ...
1
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1answer
3k views

iptables trouble: nat with ip alias (virtual interface) not working

I'm setting up an Ubuntu 11.10 server to act as firewall for a network running several different SSL websites. The idea is fairly common: have all public IP's for each site aliased to the public ...
0
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1answer
28 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 ...
0
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1answer
24 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 ...
0
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2answers
1k views

No internet connection in Virtual Machine on selecting NAT in VMWare workstation

I'm facing this strange problem from yesterday where if I select NAT as the network adapter in VMWare, I'm not getting any internet connection in the VM. I have a requirement where I have to have the ...
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0answers
27 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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0answers
24 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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2answers
474 views

Firewall in front of device with public IP address

Is it possible to have a firewall in front of a device with a public IP address without getting in the middle of NAT? I have a server that I need to put on the internet, but I want to put a firewall ...
1
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1answer
23 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 ...
0
votes
1answer
86 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 ...
0
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1answer
16 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 ...
0
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1answer
28 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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13 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 ...
1
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2answers
60 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 ...
1
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1answer
56 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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0answers
25 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 ...
1
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1answer
90 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 ...
1
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3answers
138 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 ...
0
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1answer
73 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 ...
2
votes
2answers
2k views

NAT Port Forwarding in VirtualBox

I have enabled two adapters in my VirtualBox (running Ubuntu 12.10 Server Edition), with types as: Host-only and NAT. My main motive is to be able to connect two VMs running on two different hosts ...
0
votes
1answer
78 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 ...
0
votes
3answers
80 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 ...
2
votes
2answers
3k views

iptables gives me the error “can't initialize iptables NAT”

I am trying to use iptables and it is giving me the following error root@vikkyhacks:~# iptables -t NAT -L iptables v1.4.18: can't initialize iptables table `NAT': Table does not exist (do you need to ...
0
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0answers
27 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 ...
0
votes
1answer
64 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
23 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 ...
1
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2answers
424 views

ISP 5 Device Limit - double NAT the solution?

I have asked this question in response to another question here ( 5 Max connections/devices to the internet? Is my ISP limiting me somehow? ), but thought I should start a thread to see if I can get ...
0
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1answer
212 views

ISP 5 Device Limit … again

Sorry for the delay in responding to the suggestions that were posted in my first question (ISP 5 Device Limit - double NAT the solution?). I've been travelling and have not been able to try anything. ...
0
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2answers
210 views

isp overriding netbios

I have a Thomson TG789vn v2 router and a weird way ISP (ASK4, UK) wants me to use it. They are telling me to connect their cable to Ethernet 1 slot and disable DHCP on the router. When I do that ...
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0answers
41 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 ...