Questions tagged [nat]
Network Address Translation, a technology used to translate a private IP address into a public IP.
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questions with no upvoted or accepted answers
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How packets are delivered from server to local network?
I am new to networking and am trying to understand how packets are routed on the way back from the server. I learned that when packets go out from the local network, the source address is translated ...
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Internet Connection Sharing (ICS) Port Forwarding?
When connecting my XBox One to my laptop via ICS I am able to open port 3074 required to receive an open NAT type, but other ports do not appear to open when added using the same method as 3074, using ...
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Set up Linux box as WAP for MyBookLive?
I inherited an old Linux box as well as a MyBookLive and would like to make the MyBookLive available over my wireless, essentially using the Linux box as a gateway.
I just wiped the Linux box (home) ...
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Trying to run a local server with port forwarding behind a carrier grade network from ISP, but getting no connection with localhost
i'm trying to make a half life server by portforwarding trought my router. It didn't work, i checked it out, and my public IP and my WAN IP were different, then i realised that i was in a carrier ...
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How to connect to a torrent tracker running on a local host?
I want to share huge files via bitTorrent.
I'm using Ubuntu 18.04. I've set up a tracker opentracker listening to port 6969, and a client kTorrent listening to port 6881. My network uses NAT. I ...
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Asus router cloud double NAT
I'm building my personal cloud based on Asus routers. I would like to connect a 1TB hard drive to this router and switch it on/off remotely with a phone. So far so good, everything works fine, but I'...
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How best to configure my Airport Extreme and uVerse Gateway to work together?
I have AT&T U-Verse internet service. I have their 2WIRE-manufactured wireless residential gateway (RG). It's an older one, with only 802.11g support.
I have lots of devices, both wired and ...
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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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How does uTorrent can automatically forward port through Linux Net Filter based firewall?
I have dilemma: How it is possible that uTorrent shows on my internal machine with internal IP, that my connection is OK (green check in the bottom right of its window), while I never forwarded any ...
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Attach network interface to vmware nat (bridge is not working perfectly)
I have a developer computer with two physical network interfaces (NIC A and NIC B). I have VMWare workstation and several virtual machines in VMNet8 (NAT). I would like to connect my notebook to my ...
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Does Guest WiFi on an Access Point make any sense?
I have a Belkin WiFi Router which offers a feature of a secondary Guest Access WiFi network. Of course, the idea is that the Guest network doesn't have access to the computers/devices on the main ...
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Why is my public IPv6 address different from the one listed in linux
Going to [whatismyip.com][1] on different devices inside my home network provides expected results, the same IPv4 address and different IPv6 addresses on each device. However, upon looking at the ...
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WSL2 Routing and NAT Rules
I recently installed WSL2 on my Windows 10 PC and I'm trying to understand how traffic is handled to and from WSL2. The below article states that WSL2 is running as a managed Hyper-V VM and uses a NAT ...
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in windows 10, all files in explorer ftp window have associated with chrome, how can I change this?
I tried out an app on my android phone called cx explorer mentioned here https://android.stackexchange.com/questions/167789/is-there-a-way-to-access-the-phone-filesystem-from-computer-wireless my aim ...
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My network setup do not work. FreeBSD
This question was asked by me on serverfault.com. It was closed as off-topic, with a suggestion to ask here, on superuser. The OS is FreeBSD 13.0.
The setup that I need to establish is simple. In ...
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Port forwarding with multiple WAN default routes in OpenWRT
I have an OpenWrt setup with multiple WAN connections, and a DNAT port redirect that provides access to a server in my LAN. I want my server to be accessible on both WAN connections simultaneously.
I ...
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Why my Windows NAT is inactive?
I run HyperV VM with Windows Server 2019 on my physical laptop with Windows 10. I want to have access to internet on Widnows 2019 so I created NAT on my Windows 10. I executed following command in ...
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Symmetric NAT - Peer to peer WebRTC
I am currently working on a WebRTC project that aims to communicate people by video conference in peer-to-peer.
However, according to the WebRTC documentation, there may be a problem when a user is ...
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SSH forwarding through NAT times out for one machine, but not another
This just started happening a few weeks ago seemingly out of the blue. Essentially, I have my home router setup to forward SSH to my home server. I can SSH into my server just fine from outside, but ...
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NAT Loopback (hairpin) not working - OpenWRT
I have a home network with a modem and a router (SmartRG SR905AC) provided by my ISP (EBOX). The firmware version of SMART/OS is 10.6.5.1, which is "Powered by OpenWRT", but they don't mention which ...
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Turn a multi-hop ssh connection into a direct connection
I have a machine behind a NAT (that I don't control) that has a reverse SSH connection to a home machine. I can then ssh into my home machine, and via the open reverse connection to the NAT'd machine, ...
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Wake up a computer over Internet using another computer in the same local network
I have two Arch Linux-powered computers, 'A' and 'B', connected to the Internet via the same router. I have configured and tested Wake-on-WAN on both of them. Both computers are shut down most of the ...
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Double NAT for isolation
I have an existing network but want to provide WiFi in a room that is isolated from my main network. I thought a simple WiFi router would be good for the job as the NAT will prevent access to anyone ...
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How to force users create host-only VirtualBox VMs
Managing many users within a security-strict network makes a VM a bad option. If the admin allows the installation of VirtualBox throughout the network, how can admins force users to setup host-only ...
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OpenSwan VPN Routing/NAT
I am setting up a vpn to one of our customer's networks. Due to a requirement on their end, we cannot have our traffic (appear to) come from a private ip address. I have been able to get a tunnel ...
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separating two networks with DMZ?
I am a college student wanting to get into server and networking but I have an issue I need help with at home. I asked a question about a year ago about creating two separate networks with the same ...
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How to port this NAT scenario from WindowsXP to Windows 10?
Scenario:
computer1 has 2 Ethernet NICs. One of them (external interface) is connected to the internet
computer2 has 1 Ethernet NIC
computer1 (internal interface) and computer2 are connected directly ...
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How to redirect all traffic in eth0 to eth1 and back
I have a Ubuntu box with eth0 and eth1.
How can I redirect all the traffic coming from eth0 to eth1 and back?
Should I do DNAT and SNAT like below or just forwarding or both ?
Edit
My case is like ...
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VirtualBox NAT: ICMP works, TCP doesn't work
I am using VirtualBox 5.1.8 (and 5.1.18) on Windows 7 with guest Kubuntu 16.04
Set up:
Guest has only one network interface with mode = NAT
Windows Firewall is Off (all profiles, all interfaces)
I ...
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1
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Connect two virtualmachines on different host machines
In Virtualbox is it possible to connect two VM's on two separate host machines on the same network using NAT?
I currently have two linux boxes (VM's on seperate Host machines) that aren't able to ...
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netflix stall via linux iptables nat, tcp checksum errors (with workaround)
I've been trying to track down this problem for several days. I still haven't worked out what is going on, or how to fix it properly, but I do have a workaround.
Problem summary
Netflix stalls when ...
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What are the use cases when STUN does not work?
I understand that STUN does not work with "symmetric" NATs. They assign (i.e. replace the address on the network layer and store the information in a forwarding table) a different port for every ...
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How to create enought traffic to bring my router down?
In our office we have a TP Link TL-ER604W router. Sometimes the router runs into problems and nothing in the network works anymore, also not the connection to the router itself. The only possibility ...
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How can I communicate to multiple devices that are all at the same IP address?
I work in a manufacturing environment and I have the need to communicate with up to 50 devices that are all at 192.168.0.2 from a single (Windows) computer. Assume that I don't have the ability to ...
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Test environment post carrier-grade NAT by ISP
Today I replaced my old router with a new faster router in my home. However, this event appears to have migrated me to carrier-grade NAT'ing by my ISP. I tried with my old router but the same holds ...
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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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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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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 ...
2
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1
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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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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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I can't access URL on my own server, but others can
I have a server running webcams at 96.30.159.42:8081. If YOU click on this address you will see the 3 cameras I have set up.
If I enter that address (or click on they hyperlink on my webpage), ...
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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?
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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 ...
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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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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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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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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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1
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Linux PPTP VPN and gateway woes
I have an Amazon Linux machine running in an Amazon EC2 instance.
I am connecting to my office's VPN as follows:
sudo pppd pty "pptp pptp.<DOMAIN>.com --nolaunchpppd --loglevel 2 --debug" file ...
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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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1
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Change the NAT setttings on mobile dongle
Is it possible to change the NAT type on a mobile dongle modem? I've searched the web but couldn't find anything. Should I contact the ISP for this, is it even possible. At the moment it is set as ...