In computer networking, network address translation (NAT) is the process of modifying network address information in datagram (IP) packet headers while in transit across a traffic routing device for the purpose of remapping one IP address space into another.

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Remote Desktop Connection fails after logging on and off sucessfully

this one has me scratching my head. I've been RDP'ing into a remote server running Windows Server 2008 R2 successfully for a long time. Recently I tried to add a VPN role to the server but when I ...
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32 views

Can Someone Explain Why this firewalld Command Does Not Work as Expected?

matiu asked the question of how they can do port forwarding for a single source IP address. You can read the original question here. I provided the following commands as an answer. I based my answer ...
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14 views

Static NAT Issue

I have a server inside my network that I want users to be able to access from the outside. To this end, I have setup a static nat between my internal address for this server (10.7.64.27) and one of ...
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28 views

IPTables SNAT and DNAT - How to choose correct IP Address?

I have a physical host on which I run some virtual machines. IPTables is fully open and unconfigured but I add the following rule so the VMs can access the internet: iptables -t nat -A POSTROUTING -s ...
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65 views

NAT for LXC Containers Debian 8 - no connection

I have a Debian 8 server running on a physical host machine. To seperate some services, I have created a lxc container (also debian 8). I am currently trying to set up a working NAT so my lxc ...
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13 views

Using DNAT with IPtables

I am trying to figure out a DNAT issue and I am hoping I can get a hand. Basically I have a OpenVZ box that connects to my LAN via the SoftEther Client. What I am trying to accomplish is a way to ...
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23 views

Linux Iptables Nat with two gateway

I got a CentOS server in a DMZ that act as a DHCP and DNS server with the following network configuration: eth0 IP: 192.168.100.50 SN: 255.255.255.0 GW: 192.168.100.1 Now I added a seconde network ...
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25 views

Direct native traffic TCP file transfer between two NATted machines

Aim: I want to perform the fastest possible TCP based file transfer between two machines sitting behind two different NATs, in a situation where a public port cannot be redirected to any of the two ...
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17 views

One-to-One NAT with Firehol

I use firehol to manage iptables on Ubuntu 12.04. I am trying to set up one-to-one NAT so requests from the internet and my LAN to one of my public IP addresses goes to a specific server. Here is what ...
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43 views

How to connect extensions of remote VOIP over remote STUN server?

Image of Architecture I am trying to setup I have configured the Asterisk server in a docker image and it's running, I have also configured the STUN/TURN server and it's also running on the same ...
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17 views

Iptables vm no outbound connections

I'm currently running Proxmox with a couple of vms. Unfortunatly i only got 1 public ip so i tried to work with nat. Problem is, i can't get outbound connection from my vms. Inbount connections to the ...
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32 views

NAT failed when DirectAccess Enabled

I have this topology: I have 192.168.1.0/24 as private network, 20.1.1.0/24 and 100.1.1.0/24 as Public Network. WinDC is the Domain Controller and Winrtr is Router. The ISP act as outside DNS and ...
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113 views

TCP RST/ACK packets not being sent back to NAT client with Forefront TMG

With Forefront TMG, we have an issue where all TCP connections to allowed ports work just fine when the connection is accepted with SYN/ACK, but when they are rejected with RST/ACK, the response does ...
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12 views

iptables avoiding chain's rules on nat table

I have lots of SNAT rules on HTTP (port destination 80) traffic in my POSTROUTING chain of the nat table. I'm trying to reduce the processing cost by adding a rule that filters out the non-HTTP ...
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26 views

Not getting TCP Update Window packet after TCP Zero Window begins

Once I get TCP Zero Window during data transmission, I can't send data anymore in that desktop sharing session. Even I stopped the data sending to check if it can resume but no benefit! In my test ...
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30 views

Translating DNS Server Replys because of multiple NAT Networks

I am planning and building a large infrastructure wich different natted networks. Lets say I have a datacenter network 10.0.0.0/24 and I have many different customer networks that could be anything (...
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26 views

Redirect external ip of server to external ip of virtual machine

I have a server with multiple virtual machines. Let's say this is my server ips: Internal 1.2.3.4 External 5.6.7.8 Now, if i go to 1.2.3.4:8082 it goes to my app (I redirect :8082 to de internal ip ...
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15 views

Why would you allow traffic in through a firewall if you aren't NAT'ting it?

Why would you allow traffic from Outside to Inside - i.e. from 9.9.9.9 to WAN_IP of your Firewall Interface, if you then aren't going to do anything with the traffic i.e. NAT it to a given device. ...
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32 views

Cisco ASA Static NAT RULE Problem

I need to clarify a one of cisco asa NAT rule. i searched lot and still not found a clear answer. please see below rule • nat (Inside,Outside) source static any any destination static ...
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33 views

How to reach a private IP (DHCP enabled) from a public facing IP through NAT?

Lets say we have computers C1 and C2 C2 has two network interfaces C2.eth0(public facing) and C2.eth1 local second physical network (addr:10.10.70.101 and Nw:10.10.70.0) Now, there are multiple ...
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28 views

Can potential conflicts arise between IPtables port blocking and NAT port translation?

I have set my iptables rules to open only some ports for outgoing connections. I also have snat iptables rules to do NAT which I presume will do a local IP to public IP and also a port translation, ...
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45 views

Trouble for enable NAT for virtual interface tap0 on Linux

Hi I am having trouble for enable NAT for virtual interface tap0 Situation described as below: I have eth0 interface which has internet i.e ping -I eth0 google.com works Now I have created virtual ...
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28 views

Cant configure NAT in iptables

Есть два сервера с линукс. Первый выполняет роль роутера, он имеет два сетевых интерфейса, один из которых подключен к интернету, другой к локальной сети. Второй сервер подключен к локальной сети. ...
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92 views

CentOs 6 as Firewall, forward traffic from eth1 to eth0 -> destination host prohibited

I'm setting up Firewall with a CentOs 6.0 for testing. I'm doing this on two virtualmachines. First VM (Firewall) has 2 interface: eth0 - connected to NAT with 10.0.2.10, access to internet eth1 - ...
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113 views

iptables POSTROUTING DNAT Issue

So I am attempting to do something along these lines but hopefully with a single router instead of two. My network is as follows: Device 1 <--> (Interface A | Interface B) <--> Device 2 ...
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63 views

No web access behind Cisco Router - Connection denied due to NAT reverse path failure

I have a small network behind a Cisco ASA 5505. From a computer on the network, I can't even ping 8.8.8.8. Web browsing also fails with a "DNS probe finished no internet" error. I'm getting a lot of "...
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79 views

iptables - forward traffic to VPN client

Following Scenario: Router forwarding traffic on port 80 to Machine A Machine A 192.168.0.254 Running Owncloud on port 80 Connected to VPN Provider Machine B 192.168.0.123 can connect to ...
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98 views

cisco 1800 series NAT with secondary IP

I have some troubles doing NAT. If I set up NAT for a particular port, the server replies, but it does so from a different IP address, (specifically from the main IP). If I set up NAT to B.B.B.B, the ...
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608 views

Cisco ASA 5505 cannot ping from inside to outside

Hi everyone and thanks in advance for all the help. I'm having some issue getting my cisco firewall (asa 5505) to ping between zones. The inside zone won't ping with the outside zone and vice versa. ...
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66 views

How to implement 1:1 (mapping)NAT like aws does mapping public IP to private IP

I have a machine in private network having it's private IP (lets say 192.168.1.8). I have one server somewhere having public ip (lets say 1.2.1.2) I would like to map this public IP to my private IP ...
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46 views

iptabels stcp packet not reach nat table

i want to forward sctp packet to my internal network. then i configure forward with -p sctp in nat table. but i found it not work at all. then i add some log to track to see what happen. it's ...
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191 views

web server behind NAT cannot be accessed by the same network using NAT router IP or domain

I have 1 host server as NAT server, it has public domain name example.com tied to its public IP address PUB_IP_ADD. I have another web server behind NAT with IP address 192.168.1.100 and port ...
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203 views

Asterisk recieves 403 on every outbound call after 5 minutes delay

I have a home server in my local network with Asterisk installed. It has been working without any problem for several month. I have just changed my router (ZyXel Keenetic Lite -> LP-LINK TL-R480T+) ...
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147 views

NAT problems with OpenVPN + PF OpenBSD

I rented a server to use as a VPN for educational purposes , ok so set up openvpn server and its all working. I can connect to it with my Windows 7 laptop but i won't be able to browse any website ...
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124 views

RTPProxy traversal does not work wit Opensips

I installed opensips but there is no sound on clients. This is what I did: apt-get install opensips rtpproxy osipsconfig I selectred Nat Tracversal and generated the .cfg file. The customized ....
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98 views

Error: Can't create new inside entry - forced_punt_flags: 0

I have a router Cisco 3725 and setup NAT on this but when I run command debug ip nat detailed it show error "Can't create new inside entry - forced_punt_flags: 0" My router config as follow: Current ...
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26 views

How to communicate effectively over a jumphost?

My company uses a jumphost to get into a datacenter. For various reasons I want to use applications that communicate from my localhost, to ports on a machine or set of machines in that datacenter. ...
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33 views

Expert iptables Nat - Virtual interface ip address issue

I've been looking information related to this problem several days, I had no luck finding a concrete explanation. Explanation about this issue: With this command I redirect one ip to another ip in ...
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55 views

ASA 9.1 NAT Rule issues

I added this NAT rule on my 5510 ASA object network SHF-NY-DC01 host 192.168.1.50 nat (Inside,Outside) static interface service tcp ldap 6699 access-list inbound extended permit tcp any object SHF-...
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67 views

access local network shared folder from the internet

I have a problem with my network configuration. I would like to access a folder that is in my local network and mount it on a public server. I have a VSERVER in local network (10.50.1.25) I have two ...
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110 views

VMware ESXI Behind ASA5506-Xs using Public IP is Not Communicating

Here is the lay of the land. Everything works but I cannot get data flow from ESXI Server or it's VM's I want them using public addresses from behind the router. The Vmware ESXI Hypervisor on a Bare ...
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258 views

Asterisk SIP Retransmission timeout after a month of server uptime

This Asterisk server runs fine behind NAT with a dozen of SIP registrations and the call volume of a few hundred calls per month. But then, after about a month of uptime, out of the blue the SIP ...
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15 views

Mikroti - route between 2 public adresses

I have 2 public addresses on mikrotik. Both using nat, but first is for normal users and second is for servers that I use on public network. I need to connect to second ip and services behind second ...
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67 views

IP forwarding issue in SLES12

I'm triying to configure iptables in SLES12 in order to route packages between two machines. This is the scenario. I want to connect from A to C using iptables and ip forwarding on machine B ...
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108 views

NATing with windows server 2012

Greetings and thank you in advance for your help, My setup is just like this: computer 1 Windows 8.1 with one interface configured like the following ipv4 : 172.19.209.130 mask : 255....
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164 views

How to get Ipv4 in NAT mode & Ipv6 in bridge mode together in Xen 4.4?

Here is my problem with Xen 4.4 wth Debian 8, i have one Ipv4 address & plenty of Ipv6 addresses. I would like to setup xen for NAT to route IPv4 to a private network and bridge with Ipv6 ...
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224 views

How can EC2 internal (10.X.X.X) IP addresses be mapped externally?

On our work internal network we've got a link to an Amazon domain. One of the servers we're talking to is: 10.29.112.X. Now this address starts with 10, so I expect it is an internally mapped ...
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29 views

Routing and VPN Setup

The network setup is as follows: Router: eth0 1.1.1.1 (outside) eth1 192.168.54.4 (inside) eth1 10.54.4.4 (inside) Cisco ASA5505 192.168.54.1 (inside) 10.54.4.1 (...