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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Unable to connect to web server hosted in private subnet of VPC via NAT hosted in public subnet

I have hosted my android/web application on a EC2 instance in the private subnet (10.0.1.0) of my VPC. This instance has apache-tomcat installed on it, but does not have a public IP. I also have a ...
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20 views

Router configuration for two WAN with the same ip range

I have the situation depicted in this diagram: I'm trying to route two WANs that are using the same class A IP network, and I cannot figure out which is the proper way of doing it. As a compromise ...
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1answer
11 views

Asterisk behind Cisco ASA 5505

I'm in the process of upgrading from an old WRT54GL running Tomato to a Cisco ASA 5505, versioning as follows: Cisco Adaptive Security Appliance Software Version 9.1(5)21 Device Manager Version ...
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1answer
18 views

IP Address secondary transpose

I am bit new to cisco and I have assigned 5 static IPs to my serial interface 0/0. I have NATed email in via one of the secondary IPs to the server. However, when I try to send mail out it's sending ...
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1answer
33 views

Setting up a virtual IP for high availablity [on hold]

Disclaimer; I'm completely new to server maintenance, availablity and clustering. I'm trying to achieve a high availablity server cluster configuration (failover, no load-balancing). I have two ...
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10 views

Vyatta Nat Rule Help Translating From Cisco ASA Rule

I'm fairly new to Vyatta and need advice on how to translate the following rule example from a Cisco ASA to the Vyatta. static (dmz2,outside) 192.168.254.0 192.168.254.0 netmask/24 How do I ...
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3 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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1answer
17 views

nat/portforwarding setup to access server on different network [closed]

So in the office we have two networks, network A and network B. We have a server on network B due to limitations we cannot remotely access network B. Is it possible to set up port forwarding and nat ...
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1answer
34 views

Cisco IP Redirection (static NAT?) for non existant IP Range

We are moving office and our managed service provider has let us down badly. We have a Cisco 4500 stack with 5 VLANS configured of interest. These are: interface Vlan200 description FLOOR0 Gateway ...
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12 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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1answer
46 views

pfSense can't access https website

I have just installed pfSense on a PC Engines APU1D4 to evaluate as an alternative to a Soekris 5501 + OpenBSD based setup, I have a PPPoE WAN configuration. The pf rules, NAT and PPPoE ...
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17 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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1answer
37 views

How to make VMs get LAN IPs from ESXi 6 Host

I have a very simple setup where my ESXi host is hooked up to the LAN just as other regular PCs. I have created a few VMs on that host and want to be able to access the LAN as if these were hooked up ...
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19 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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4answers
84 views

pfSense not forwarding back packets

I have a pfSense box setup where my WAN interface (em0) is set up in my local network (192.168.1.100) and my LAN interface (em1) is a private network of its own (10.0.0.1). The end goal is to have the ...
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40 views

tcp previous segment not captured when NAT

I have a client request web service on a server behide NAT. My client IP is 10.54.10.193 NAT address: 10.54.28.183 Server address: 62.209.39.203 When client request web service on server we have TCP ...
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6 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 ...
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14 views

How does NAT work with more than 2^16 devices? [duplicate]

According to this article, NAT keeps track of which devices to route responses to by specifying a response port that it listens on. For example, when I make a request from a NATted computer, my router ...
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1answer
39 views

forwarding from internal to external network does not work

I have a Ubuntu 14.04 LTS server with two NICs. One is connected to the internal network (eth0, 192.168.4.0/24) and the other one is connected to a router with internet access (eth1, network ...
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1answer
12 views

public tunnel into private behind-nat machine

Say I have a web server running on my local machine which is connected to the internet but behind NAT (let's just assume it cannot be reached directly from the outside but It can open TCP/UDP ...
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2answers
77 views

Hyper-V host with one External IP address. How do I assign guest VMs an internal IP and configure NAT?

I've been struggling with this for a few days now, I've got a Hyper-V host with one statically configured external IP address. There is no DHCP server or internal network to retrieve an IP. How do I ...
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2answers
67 views

Trying to hookup 10-15 laptops to a switch, could someone point me in the right direction?

Let me start off by saying I am not a system administrator, however I am desktop client support. I have the need to have about 10-15 laptops to be hooked up to a switch that gives all 10-15 laptops ...
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1answer
30 views

Iptables not routing GRE protocol

First things first, there might be a few English errors, considering it's not my native language. I'm having a problem with VPN(GRE protocol) passing through Iptables. I've done this at least a dozen ...
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22 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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2answers
38 views

Can I access a NAT addressed host behind a gateway from the WAN side without DNS or VPN (with DNS if it's not possible)?

I have a very simple gateway running a minimal Linux which is serving as an IP router with NAT and DHCP on the LAN, and a static IP on the WAN. The gateway router from the LAN side goes to a big ...
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2answers
29 views

iptable alternatives debian VPS

i am confused that i dont find any soloution... i will configure an reverse proxy and that with iptables for my gameserver on debian: Kernel: 2.6.32-openvz-042stab108.2-amd64 iptables -t nat -A ...
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1answer
23 views

KVM guest static ip with ports forwarded to another guest

Im on host-machine with Centos 7 and 2 guests on Centos 6.6. I want one of my guests have static external ip but some his ports must be routed to another guest. On host machine I do: iptables -t nat ...
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29 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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1answer
43 views

Vyatta and DNS Rewrite (aka hairpin or doctoring)

I'm trying to make my public IP reachable also from inside LAN. I know that it's better to spilt DNS in order to have an internal zone that solves hosts with internal IP, but for a lot of reasons ...
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3 views

virtualbox: set up a private network for my VMs [migrated]

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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29 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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106 views

pf (Mac OS X) rule to redirect all traffic to a specific ip/port

I'm trying to recreate this iptables setup (from https://github.com/darkk/redsocks) with pf: iptables -t nat -A REDSOCKS -p tcp -d 10.0.0.0/8 -j REDIRECT --to-ports 12345 iptables -t nat -A OUTPUT -p ...
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1answer
42 views

Use multiple WAN IP addresses on a single VLAN

Our ISP has given us a /25 range of IP addresses on our lease line. We want to be able to create several VLAN's and direcly assign each VLAN with any number of these WAN IP addresses. For example - ...
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28 views

Dual WAN and NAT on ZyWall

I have Zyxell ZyWall USG-50 router firewall and I want to configure dual WAN navigation. On WAN1 I've 10Mbits connection and on WAN2 I've 100Mbits connection. I want my LAN to navigate with WAN2 and ...
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1answer
24 views

Why does iptables not doing DNAT for the same subnet? [duplicate]

I have the following NAT setup: +--------------+ +-----------------------+ +-------------------+ | | | | | | | | ...
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1answer
64 views

Asterisk does not use externip

I am trying to setup a cloud Asterisk server that is behind a NAT with the hello-world example. I have NAT issues. The IP address Asterisk is supplying to the client through the SDP is its local ...
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1answer
41 views

How can I do site-to-site OpenVPN routing without NAT

I have two OpenVPN servers at different location. Each machine in one location can ping and connect to every machine in the other location. My problem is when I use SSH to connect from machine A in ...
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0answers
10 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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0answers
23 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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0answers
34 views

PFSense NATing to a load balanced server

I apologize for not being able to post the network diagram here but as this is my first time asking a question here I am not allowed. So here is the scenario: We have a site that is build with a ...
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1answer
26 views

External IP becomes unreachable sporadically

I have a very strange problem - We have a lease line with 50 odd external IP addresses on it. We do a 1:1 assignment and Outgoing IP assignment to interfaces on a pfsense proxy server. For each ...
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98 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 : ...
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1answer
52 views

Original IP lost with IPTables NAT to another server

I'm trying to forward all HTTP traffic from one EC2 linux server (external IP 11.11.11.11) to another one (external IP 22.22.22.22), these rules set: sudo iptables -t nat -A PREROUTING -p tcp --dport ...
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29 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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1answer
58 views

Troubleshooting “Network is unreachable” from within an Amazon VPC

An EC2 instance is running Amazon Linux in a public subnet in a VPC. Here are the outbound rules for its security group: ALLOW TCP on port 80 to 0.0.0.0/0 ALLOW TCP on port 443 to 0.0.0.0/0 ALLOW ...
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139 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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1answer
43 views

Dynamic NAT configuration

I am using two routers and one host (computer), I connected fast Ethernet 0/1 of router A with the host and fa0/0 of the router A with the router B I have configured gateway as last resort on both ...
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1answer
36 views

Iptables DNAT working in my own network, but not through VPN

For some reasons I need to switch a server ip to another ip, in order to be seen by another computer elsewhere through vpn. So I'm using iptables (didn't know any of that until yesterday) and testing ...
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1answer
94 views

Can't get voice after changing Asterisk UDP port

Test environment consists of a CSipSimple client, Asterisk server and a router with NAT. Formerly the equipment used UDP port 5060 and everything was good. Then I changed port number to 15000 in ...
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1answer
27 views

Hyper V and NAT Redirect IP on different VM

I have 2 IPs public (but one physical network port) and i want redirect IP public 1 on my VM 1 and, IP public 2 on my VM 2 But when i check my NAT configuration i can just redirect port on my interne ...