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

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Simulate SNMP Trap with SNAT

I have to test SNMP 2c Traps. I want to send those traps from some computer and the trap destination has iptables. So before the trap enters the NMS, I could just rewrite the real source of the trap ...
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276 views

Tunnelling TCP connection through NAT

My server is in my school's NAT and my desktop computer is in my home NAT. I want to SSH to my server from home. I normally used school's VPN, but recently for some reason I can't. So I'm looking for ...
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103 views

Turning Computer into Router,Network Address Translation encryption.?

I have windows seven and am using connectify. but when i try to connect to the interner through my ethernet court in my dorm room the comp0uter doesnt recognize the ethernet cord. I belive that the ...
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61 views

Linux VM can not connect to the internet

I'm trying to set up an virtual server with connection to the internet. When I start a ping to the local network, there are no problems. When I try to ping an address from the internet, it shows that ...
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718 views

After NAT how to setup VPN in windows server 2008 r2?

We have one windows server 2008 R2 with about 10 Hyper-V virtual machines. We've used wizard that comes when you enable RRAS to setup NAT, so that virtual machines can connect to internet (and to ...
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22 views

Most efficient way to proxy a port from one host to a port on another

I have a host with one IP address which is using port 443 (HTTPS) with one certificate. I want to run a second app on this IP address using a different certificate on a different port. To prevent ...
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28 views

Private to private network address translation

I need a black box that will translate 192.168.1.1 to 192.168.1.2. Can a NAT router do this? The problem that I am trying to solve: I have 2 devices with identical IPs of 192.168.1.1. The devices ...
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15 views

NAT configuration for HTTP server

There is a router (192.168.1.1) having static public IP(hypothetically- 8.8.8.8). This router is programmed to forward all incoming port 80 (TCP/UDP) connections to a particular IP (192.168.1.105). ...
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19 views

Item's refresh in Port Address Translation Table

When does an item is removed from PAT Table? In TCP I would say it happens when connection is closed, but I'm actually not really sure. Does NAT Device know when a table's entry will never be used?
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67 views

SIP: The other party can't hear me but I can hear them when using Asterisk

Please read carefully all the question and do not rush to a conclusion. === Test environment for point-to-point calls, without Asterisk === City1: A router with NAT and WiFi and 5060 UDP port ...
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38 views

Change default network settings for VirtualBox when using NAT

I'm running into an issue where VirtualBox is assigning a guest from 10.0.2/24 when using NAT mode. The problem is its a real network on this site. I see how to change the setting for a particular ...
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86 views

Cannot VBoxManage ModifyVM --nataliasmode1 when running

I tried to run modifyvm PS C:\Program Files\Oracle\VirtualBox> ./vboxmanage modifyvm XXX --nataliasmode1 proxyonly VBoxManage.exe: error: The machine 'XXX' is already locked for a session (or ...
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58 views

Why do my nat iptables rules not work with marked packets?

System: debian squeeze, Linux server 2.6.32-5-amd64 #1 SMP Tue May 13 16:34:35 UTC 2014 x86_64 GNU/Linux, iptables v1.4.8 lsmod | grep iptable iptable_security 2176 0 iptable_mangle ...
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79 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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26 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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63 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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86 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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232 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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314 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") ...
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46 views

A lot of random NAT tables appear

My brothers Mac seems to be infected. It keeps on sending UDP and SYN floods to our router, and it multiplies my ping 10 times.When I look in the NAT Mapping table there are a lot of random address ...
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941 views

VirtualBox and Samba 4 on Linux Guest (NAT and Host Only)

Gentlemen, I really need a help from you to configure the "Samba 4" using the "Virtual Box". Here's the situation: In certain networks where I work, the Samba 4 works, in other does not. The guest ...
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72 views

How do I configure NAT to forward external requests?

I have three Raspberry Pi's connected to Linux machines and one computer (also a Linux machine) connected to a router which is connected to the Internet. My goal is to configure each Raspberry Pi and ...
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154 views

NAT routing command in windows

Is there any specific command in windows which do the following task: I want to modify the source IP address in the packet whose Destination IP is not in the private LAN, i.e., I have a virtual ...
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128 views

Netgear NAT over LAN TO LAN

I have the following question: I need to connect through a vpn IPsec lan 2 lan tunnel with a partner but they want that I connect through a specific ip subnet which is not mine. Here's the situation: ...
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298 views

IP forwarding with iptables

Suppose there are hosts A and B. A is allowed SSH access to B based on its IP address. Consider now another host C. C does not have access to B, but if we could route its traffic through A, then C ...
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516 views

Routing table on Linux not respected

I have a very specific problem, building a Linux VPN endpoint (with external VPN Gateway), which should route certain networks over the tunnel, others via default gateway. The Linux VPN should do a ...
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165 views

Is there a decent diagram of packet flow for a modern era (2.6+) iptables setup?

I'm currently trying to debug a particularly hairy set of DNAT based iptables rules (the UDP reply never makes it back to the original requester) and I'm struggling to visualise the packet flow ...
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467 views

How do you set up port-forwarding on a SwissCom Motorola Centro Grande?

I'm setting up a Minecraft server and the NAT forwarding on my router isn't working. This isn't the first time I'm doing this - I previously did this with an Apache server (used to run a server) and ...
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585 views

VMWare networking mode (NAT)

I've created a new WinXP vitual machine on my win7 using VMware player. This virtual machine is using NAT (10.0.0.0/24) and has a WAMP server running. I want this to be NAT as I want the server to be ...
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468 views

Mac OS X Lion - forward all connections on port 22 to external ip

I need to forward all connection to any address port 22 to a different gateway (i.e. no default). Firstly I suppose to do it with ipfw: sudo ipfw add 5 fwd $EXTERNAL_IP,22 tcp from any to any 22 ...
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140 views

peer to peer software vpn solutions?

Looking for a software based way to create a vpn for sales guys that will automatically reconnect if dropped (setup pptp dialin for moment but doesnt autoreconnect). I'm aware of Hamachi which is ...
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892 views

How can I port forward with an airport extreme and a NAT enabled modem?

I run an Actiontec HD701D modem with NAT to an Airport extreme base station to laptop etc. As you might expect I get double NAT issues. I tried a lot of different things to forward a port, but no ...
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8 views

Is it possible to setup a NAT loopback on a router with a dynamic IP using iptables?

I've set-up a Raspberry Pi home server attached to my router. I have a dynamic IP. I can access the server within my network using the internal IP (192.168.0.8). I can also access the server outside ...
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14 views

Setting up server behind uncontrolled firewall

(Firstly, I apologize if this is on the wrong site. I am not a network engineer or a web master or anything like that.) Going off to college and my brother and I want to continue hosting a minecraft ...
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7 views

Networking between two VMs via host

I have two virtual machines in VirtualBox. I would like to do networking between them via my host OS. In this case they should interract only via my os. I tried NAT but I can't ping then both my OS ...
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12 views

virtualbox: set up a private network for my VMs

I have a few virtual machines I used to access with ssh. I set up their network configuration as Bridged and I set a static ip to them. But, as I'm moving from work to home to customer, the subnet ...
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21 views

Why does iptables not doing DNAT for the same subnet?

I have the following NAT setup: Whereas Host 1 has a VM with IP 10.0.0.3 and HOST 2 has a VM 10.0.0.4. The NAT box will have a NAT rule such that it changes the dest IP 172.24.4.2 to 10.0.0.4: -A ...
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43 views

How to set up NAT-less wifi hotspot with Windows 7?

I have a Windows7 and I want to use it as a wifi hotspot, but with a little bit uncommon configuration. Normal win7 wifi hotspot can be set up with some net commands, it is not a problem to me. Wifi ...
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33 views

iptables does not redirect my HTTPS request

I configured my tables to redirect all traffic to a static IP. for ports 80, 443 + any port (NAT-DNAT redirect withour having specified ports). If I enter an IP:anyport or an url.ext, it does ...
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42 views

One virtualbox linux machine act as router the for second virtualbox machine

I have 2 virtualbox machines setup with debian. The first one has 2 network adapters: NAT and Internal Network, the second one has only 1 network adapter: Internal Network. On the first one I have ...
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50 views

Virtualbox NAT port forwarding not working

I am trying to forward Growl messages from my virtualbox windows guest to the growl notifier instance on my windows host. Growl runs on port 23053. Here is my network configuration. But I'm not ...
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23 views

Automated Wifi on Raspberry Pi

I have a NAT set up, that allows my devices to bypass the MAC filter in the local dormitory router. The setup works, but since my original "nat server" has died (the HDD got fried), I had to put my ...
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32 views

How to setup a HTTP caching proxy inside a NAT which is not a gateway?

I have the following setup of OSI level 2 and 3 devices in my IPv4-LAN with internet connection behind a NAT (all clients and servers are in 192.168.1.0/24) Internet | Gateway (WiFi-"Router")/NAT ...
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91 views

Cannot ping virtual host behind NAT port forwarding

I'm creating network between real Windows 8.1 (R) and two virtual Debian 8 (V1, V2) using VM Ware. V1 has running Tomcat and should have access only to V2 and R should redirect V2 to V1. I used two ...
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35 views

My DMZ Host on the router is not working

I am using DLink 2750u router to connect to the internet. I have connected my RaspBerry Pi to the router and set up the DMZ Host on the router. I configured ddclient on my Pi and it is working fine to ...
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72 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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19 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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57 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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72 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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99 views

CentOS as home network router: IPTables Port Forwarding failure

I have currently set up a home server with a CentOS 6.6 installation on it. The server has two NIC interfaces which I'm using it as my router and DHCP server. Here's a diagram showing the network ...