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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Manual NAT on Checkpoint (Redirect all http requests to a local web server)

We have a proxy server in our internal network and I want to redirect all internet http requests to a web server in local network. It'll be like a Network Billboard that says "No direct connection is ...
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812 views

Forward traffic to local LAN IP while keeping the originator IP

I am trying to forward traffic from one server to another, while keeping the origin requestor IP. Therefor I cannot use SNAT or MASQUERADE. SERVER A: Public IP: 111.111.111.111 Private IP: 10.0.0.1 ...
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133 views

Cisco 2900 configuration

I agreed to help a non-profit figure out their network woes. Nothing had been documented and the folks that set the system up aren't available. Wires were cut and left hanging. The organization has ...
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566 views

iptables forwarding a port between 2 networks with 2 ethernet cards

I have a server handling several services. For the purposes of this questions, suppose one of them is mail. If mail goes down, I want to forward it to another host. My network looks like this: -- ...
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RESOLVED Why does IPtables's NAT stop working when I enable the firewall's third interface?

On my firewall I've three interfaces : eth0 : public IP (46.X.X.X.) eth0:0 public IP (46.X.X.Y.) eth1 : public IP (88.X.X.X.) eth2 : private LAN (172.X.X.X) I've setup a basic NAT which ...
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Is NAT the same as a Routing with DHCP in the virtual VMnet 8 (NAT) in VMWare?

Is NAT the same as a Routing with DHCP in the virtual VMnet 8 (NAT) in VMWare? Or how does the routing take place in these virtual environments?
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Special Routing and NAT requirement

I have a rather special routing and NAT issue which I hope I can fix somehow. Inside my company we run a supernet like 192.168.0.0/21 (192.168.0.1 - 192.168.7.254) All computers have this subnet mask, ...
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129 views

NAT, iptables and problematic ports

I am building a small office network with virtual machines. My schema is this: Computer A: gateway, ip 1.1.1.1, iptables used for NAT [eth0=public internet dhcp, dhcp; eth1=gateway] Computer B: ...
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2answers
887 views

Iptables: Forwarding packets doesn't work

I have 3 Linux Systems A, B and C. A is a TCP Client and sends a message to TCP Server on C. A can see only the external IP of B which is at wlan0 interface, 192.168.0.3 ------------------ ...
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2answers
335 views

is there any project that allows for NAT traversal for generic online guests?

Scenario: The basic goal is to allow "generic" online guests to be able access to some server behind a NAT. For example say I'm hosting some images on a server behind a NAT, I don't have admin ...
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2answers
510 views

sonicwall vpn and NAT

I have a site-to-site VPN set up with a vendor. Let's say the tunnel endpoints are 192.1.1.101 on my side and 192.1.2.0/24 on the vendor's side (which get's NATted to their LAN of 10.x.x.x). This is ...
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424 views

Linux, some packets are not being NAT

I'm trying to NAT HTTP traffic, I'm new to this and facing some issues. What I'm trying to do is NAT client HTTP requests to a webserver. CLIENT -> NAT BOX -> WEBSERVER When the client open the IP ...
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438 views

Bastion Firewall Host ipTables Redirect Question

Some background: A firewall has been constructed using RH Fedora 13, Kernel 2.6.34.7-63, and IPTables 1.4.7. The firewall is a simple, twin adapter configuration, with the external interface (eth0) ...
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2answers
93 views

webserver unreachable for short periods

We have a development webserver (ubuntu) with some websites running on it. Most of the time this works fine but since some time when we are developing we get a "cannot connect" error when loading a ...
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2answers
556 views

OpenVPN AS accept connections forwarded by NAT

We're running OpenVPN AS servers which are accessable and working over a public IP. But some of our clients aren't allowed to access our VPN server directly (because of some nasty firewall admin - ...
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2answers
369 views

Problems with commands to configure the NAT on CISCO ubr7200 series

I have a Cisco uBR7200 series CMTS with these features: Cisco Internetwork Operating System Software IOS (tm) 7200 Software (uBR7200-K8P-M), Version 12.3 (9a) BC9, RELEASE SOFTWARE (fc1) Cisco ...
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91 views

Portforwarding with IPTABLES and Remote IP detection

I was able to forward 80 port from my primary server 192.168.90.1 to the second one 192.168.90.2 with IPTABLES The primary server has a public address X.X.X.X so I forwarded X.X.X.X:80 -> ...
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IIS and Apache hosting together

I know similar questions have been asked already, but mines a little more unique. I work for an internet/networking company. We build and host websites, as well as provide internet and network setups ...
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2answers
627 views

cisco ip nat / port forwarding

I have been trying to get port forwarding working with a newly installed cisco router. I cannot seem to find where my fault is and have been looking for quite a while. The relevant section of my ...
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2answers
858 views

Unable to PPTP through NAT on Cisco 881

I'm trying to connect to a PPTP server which is sat behind a Cisco 881 NAT router. The server is running Ubuntu Server 12.04 and is running Poptop pptpd as the PPTP daemon listening for connections. ...
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145 views

Iptables DNAT / only one url

I have a rule similar to this: iptables -t nat -I PREROUTING -p tcp --dport 80 -s 192.168.1.5 -j DNAT --to-destination 192.168.1.2:80 which redirects all http requests from 1.5 host to 1.2.. I want ...
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Cisco ASA - Configure External Access to a Server

I'm trying to configure my ASA (ASA 8.4(2), ASDM 6.4(5) ) to allow external access to a server (using RDP). I've tried everything, but it doesn't seem to be working. I'm sure it is something simple ...
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2answers
246 views

webserver from local network (behind NAT)

I have a debian server (gateway, web) which is behind ISP's NAT. I need access on webserver from my local network but domain has DNS record for external IP. Can I create "fake dns" for my local ...
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87 views

Server 2003 - Secure remote file access

I've really got very little idea what I'm doing here, so please forgive me if I am missing anything painfully obvious. As the nerd of last resort for a friend, I've recently found myself in the ...
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2answers
533 views

Public-to-Public IPSec tunnel: NAT confusion

I know this is possible -- and apparently fairly common with larger companies that don't/can't route private addresses for overlap reasons -- but I can't wrap my head around how to get this to work. ...
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1answer
223 views

Trigger iptables masquerade before reaching service on gateway?

I have a STUN service running on the same machine that is the gateway for the LAN, I would like the results from the STUN service be the same for both internal and external machines. Currently since ...
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1answer
453 views

RDP to Windows XP guest on kvm constantly reconnecting after logon

ISSUE I have, after some days of "hard" work, managed to correctly configure kvm on a Centos 5.5 host. I have 2 VM running successfully. Since I only have one public IP address (for the kvm host) I ...
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1answer
362 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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1answer
388 views

How do I fix Hyper-V Guest OS connectivity problems through RRAS/NAT?

I have a Hyper-V host machine with NAT set up for my guest virtual machine. At a client site, the host connects to a wireless network through a cert (and then there's a proxy to access the extranet). ...
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1answer
150 views

Using twice NATTing and dns_Alg

I am trying to use twice nat along with dns_alg to support a framework, and take its measurements. I have a private network 192.168.0.0/24 this network contains www,dns,dhcp etc for its own ...
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1answer
381 views

Is there any L2TP client without IPsec?

I want to use L2TP to through NAT, but i do not need IPsec, because IPsec waste much CPU. I can setup one L2TP server on linux, so is there any L2TP windows client without IPsec ?
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103 views

Restrict NAT in IOS to only one public IP

I've managed to enable port-forwarding on my Cisco 877 but I wasn't able to find a way to specify a single accepted IP from the outside. Any link to a Cisco documentation or commands to type in IOS ...
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1answer
115 views

Routing + NAT for two laptops

I have two PC's (two laptops). In one of them (on the laptop) installed Linux Mint 9. It has two interfaces (WAN via Cable and LAN via Wi-fi). I want to configure routing in it to provide access to ...
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1answer
233 views

How to connect to Wi-Fi device through another machine available through VPN?

We are developing app for device named iTach WF2IR, but we doesn't actually have that device, we will get one in 4 weeks or so. Meanwhile, we should make demo for that device in a week. So we decided ...
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1answer
254 views

Connections fail routinely from the internet to a ADSL router doing NAT

I have a Comtrend ADSL router that routinely fails to sustain connections via NAT (I try HTTP and SSH) to a machine in its internal network. I can connect for, say, half an hour and then the ...
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1answer
58 views

can anyone show me how can i fix error with my NAT config

Can anyone help me with my packet tracer problem? My network 2 buildings (each building has 3 vlans) on the same side and it has 2 sides, between is internet. I finish with DHCP and now I try to ...
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1answer
434 views

How do I set a static IP for a virtualbox guest that has a network adapter configured for NAT?

I am running Ubuntu 12.04 as a VirtualBox guest, but I'm having trouble configuring a static IP. I have the network adapter configured for NAT, because I can't assign static IPs on my Universities ...
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1answer
173 views

iptables NAT Forward 443 Port DNAT,SNAT failing

I'm trying to setup a proxy server that handles http and forwards https to the webserver. Client > Proxy > httpd I added the rules: iptables -t nat -I PREROUTING -i eth1 -p tcp -m tcp --dport ...
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1answer
1k views

Pfsense Virtual IP NATing

Am setting up Pfsense 2.0 but am stuck when it comes to port forwarding/Natting. I've done it before but not using Virtual IPs. Say I have WAN on 11.11.11.1 and LAN on 192.168.5.5, I have added a ...
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1answer
123 views

Multiple External IP's

I have a Virtual host server that has 6 VM's on it running a Windows SErver 200i8 r2 enviroment. I have two domains externally one of which points to my static IP. How do i use my other static IP's ...