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

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Do I need STUN?

My router has a "real" static outer IP address. Behind router's NAT there is an Asterisk server. Router is configured to forward 5060 UDP port to Asterisk machine. Do I need STUN server assuming that ...
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31 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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10 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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0answers
28 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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0answers
16 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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2answers
8k 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 ...
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0answers
19 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 ...
4
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1answer
5k 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 ...
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1answer
13 views

Incoming connection in NAT

A very basic question: As per my understanding, a machine in an external network cannot initiate a connection to a machine behind a NAT router. Is there a way I can allow this? Regards
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1answer
4k 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 ...
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0answers
20 views

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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1answer
25 views

PS3 Ideal NAT Type

On the "Internet Connection Test" on my PlayStation 3, it lists my "NAT Type" as "Type 2." What is the ideal NAT Type and how does the NAT Type affect my games and streaming media?
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1answer
155 views

vpn, IP forwarding and nat

I have setup a Softether VPN on an Ubuntu 14.04 server in an aws network which has about a dozen servers using this guide. The only difference is that I have used SecureNat and softether DHCP. I can ...
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26 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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0answers
13 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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3answers
602 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, ...
2
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1answer
43 views

How does my computer's firewall work? Like inbound rule, outbound rule, reply?

So I understand how NAT works, but I don't understand how firewall works. With non-symmetric NAT, if someone sends me a packet, it gets blocked, but it I send someone a packet and they get that packet ...
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1answer
194 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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0answers
75 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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1answer
76 views

Virtualbox - how to custom NAT and port forward?

How can I use Virtualbox custom NAT and also port forward? For demos, I am running my VMs behind NAT on my laptop. If I run it in the vanilla NAT mode, then each VM I spin up automatically gets ...
1
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1answer
35 views

How can I configure my two routers so any device can connect to a server on any other?

Network setup: ADSL2+ modem/4-port router (SpeedStream 6520) Wi-Fi+3-port router (TD-W8960N, 4th/WAN port connected as device to modem/router) I have to admit that I know pretty much nothing about ...
3
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2answers
4k views

Virtualbox: NAT networking suddenly stopped working for all Windows guests, Linux guests still OK

My host is an out-of-the-box Ubuntu 12.10 simply connected to Wifi. I installed VirtualBox, and then a few Linux and Windows 7 Pro guests on it, all with default VirtualBox options (NAT). I reboot ...
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0answers
18 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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31 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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1answer
18 views

port forward in INPUT level

I want to change the destination port of the ipv6 packet in the INPUT level. So I tried to use ip6tables with nat in the INPUT level but seems this command does not work # ip6tables -t nat -I INPUT ...
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3answers
43 views

How do clients identify the router on a network?

How do clients connected to a LAN network with a NAT router connecting the network to the internet, identify the NAT router and hence know where to send their traffic for the wider internet. If this ...
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4answers
90 views

Point of subnets

This page gives two options for if you have more than 254 hosts, get another IP range or use subnets. But if you've got an IP address range which lets you have more than 254 hosts, why not just keep ...
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1answer
83 views

pfsense with 4 WAN IP and outgoing NAT

I have a pfsense with a single wan ip, i want to assign multiple wan ip's. The pfsense machine is located on a vm machine with the other servers i wish to NAT forward. I want to give each server a wan ...
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2answers
7k views

How is double NAT bad practically?

As the ISP-provided modem was generating pretty weak WiFi signal I've disabled its WiFi function, bought an Apple AirPort Extreme and connected it's WAN port to the modem. Now everything works just ...
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3answers
24 views

Linking 2 Linksys Wireless G Routers to have 2 separate networks

I am creating a lab for a group of people and I want to perform a miniature netwars. My plan is to have 2 wireless routers that the two teams can gain access to their respected router. How do I link ...
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1answer
536 views

OS X natd, nat between en0 and tap0

I'm trying to connect a tap0 and en0 interface with the natd. The (simplified) background is: I have one application running on a smartphone and a simple UDP Server running on my laptop. The UDP ...
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2answers
33 views

link machines which are both behind NAT via ssh tunnel

I have two machines. both behind NAT. Also I have access SERVER from each machines. Is there way to do ssh tunnel from machine1 to machine2 via SERVER? Client machines are linux mint. SERVER is ...
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14 views

How to enable miredo UPnP-Enabled Symmetric NAT Extension

I have linux mint and miredo installed on both machines. Both machines are behind symmetric NAT. Routers have UPnP enabled. Does miredo support upnp routers? How to enable UPnP-Enabled Symmetric NAT ...
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2answers
129 views

Setting up DHCP and NAT on apple extreme with Virgin Media SH (APPLE)

I'm currently going mad trying to get my Apple Time Machine to be the DHCP and NAT Server. I've turned off DHCP in the Super Hub config and turned DHCP and NAT on in the Time Machine. Doing this, I ...
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3answers
55 views

Routing to sub network with local DNS

Short and clean question We has domain that can be resolved and accessed from internet as ip. On host with that ip we has NAT and virtual machines that hidden behind that NAT. How can we give access ...
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2answers
27 views

NAT how to configure with a VPN

Good morning, I'm in trouble. I need to be able to connect to my Windows PC (not locally) and I cannot open my router ports (my internet provider doesn't let me). So I've been thinking on creating a ...
14
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4answers
71k views

Does mailx send mail using an SMTP relay or does it directly connect to the target SMTP server?

Suppose i send a mail using the following the following command: mailx person@x.com then does mailx first try to find out the SMTP server of my ISP for relaying the mail or does it connect ...
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0answers
40 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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0answers
18 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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0answers
36 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 ...
0
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1answer
41 views

How to reliably set up communication between the VirtualBox guest OS and host OS?

I have a VirtualBox (Windows 8 guest on a Windows 8 host) with NAT networking set up. I would like to set up the guest system to emit Growl messages that would be picked up by a service on the host. ...
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2answers
104 views

Traffic redirection with Rasperry Pi router

I use a Rasperry Pi (running raspbian) as a wi-fi router. It redirects traffic from the Ethernet wire (eth0 - wire + ppp0 - L2TP connection, lx2tp used for it) to wlan0 (USB wi-fi dongle, hostapd used ...
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0answers
50 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 ...
0
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1answer
37 views

Accessing web service on routed (without NAT) network

I have network topology where I use two routers: R1 and R2. R1 has NAT enabled because my ISP allows only to connect one IP. R2 has NAT disabled because I'm planning to extend my network in the future ...
2
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1answer
35 views

Custom nameservers over wifi hotspots with initial web login

I have built a portable router using a raspberry pi. My setup works, unless I connect to a hotspot that requires some kind of web based login. After some investigation, I think I've tracked it down ...
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73 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 ...
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1answer
265 views

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

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 are set to port 22, ...
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0answers
28 views

NAT Rule for PPTP Port Forwading

I'm under a very heavy firewall where only very common ports such as 21 and 80 are open. I installed PPTP on my own dedicated server (a Debian Linux) and I`m trying to connect it using Windows, but ...
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0answers
15 views

https proxy setup in NAT-ed clients

I have network setup as follows: I have 2 PCs. A and B. A is connected to Internet, and A and B is connected by local network. B can also connect Internet through A by NAT setup. In A, the NAT setup ...
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1answer
2k views

Why can't I access MySQL server with port forward rule in router?

This is my setup (the relevant parts, anyway): I have port forwarding rules in place (in the Linksys) for all the relevant ports and I've restarted that router multiple times, each time hoping that ...