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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Windows Server 2003 IPSec Tunnel Connected, But Not Working (Possibly NAT/RRAS Related)

Configuration I have setup a "raw" IPSec tunnel between a Windows Server 2003 (SBS) machine and a Netgear FVG318 according to the instructions in Microsoft KB816514. The configuration is as follows ...
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191 views

Multi homed firewall with ipnat

i am trying (without success) to configure a ipnat/ipf box under FreeBSD 8.2, here is the scenario: outside inside +----+ ADSL ...
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40 views

Stateless NAT with CentOS 6

I'm looking to set up the following: ---[IVR 1] | (internet)----[CentOS box]---+---[IVR 2] | ...
2
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1answer
228 views

Redirection with natd flags on FreeBSD

I am trying to setup a basic NAT server. I want all traffic coming from the outside world to the NAT server to be redirected to another machine, where I have a lipcap service running to parse this ...
2
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1answer
101 views

website not accessible with IIS6 while NAT is configured in Windows 2003

I have Windows2003 server configured with IIS 6. Until now it was working fine, but since I enabled NAT for my users to access the internet via this server, the website becomes unavailable. Note that ...
2
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1answer
119 views

OpenVPN tunnel, iptables don't support NAT

I wanted to route my private PCs traffic through my VPS and set up my OpenVPN as fas as necessary but now I have the problem that I can't set iptables, since NAT support is disabled for my server's ...
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1answer
437 views

Routing between 2 different subnets on 2 different interfaces in SonicOS

I'm having a bit of a problem allowing traffic between two of my subnets. Here's the structure I've built. The X0 interface has our windows server on it and it handles DHCP/DNS, etc. X1 has the WAN ...
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1answer
58 views

Websever behind Sonicwall, Gateway Timeout

I am stuck here, I have a Cradlepoint CBA750B in IP-passthrough mode connected to x1 on my Sonicwall NSA220. Behind the Sonicwall I have a webserver on the LAN. I have X1 set to use DHCP to get the ...
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1answer
127 views

Access Apache VirtualHost from localhost

I have a DirectAdmin setup with Apache on a server which is behind NAT. Everything is working correctly when accessing a VirtualHost from outside the machine (either through the Internet and the ...
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1answer
235 views

Redirect traffic on port 80 into apache for unknown macs, and into squid for some macs

I have a linux box behaving like a router that handles two network interfaces: eth0 for internet and eth1 for LAN. I set up iptables in order to redirect all the web traffic coming by the LAN into a ...
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1answer
318 views

iptables can drop traffic but cannot redirect

Suppose that TCP packets are sent to destination ip (dest_ip) and can be dropped by the following command: iptables -A INPUT -d dest_ip -p tcp -j DROP But when I try to redirect the packet using ...
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1answer
180 views

Passive FTP that would work inside and outside of NAT

I'm using vsftpd 2.2.2 behind the NAT. To make it work, I set pasv_address to my external (internet) IP. Now the problem is with clients that connect it through the LAN - they try to connect to the ...
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1answer
261 views

Setting up IP masquerading by passing packets through external nodes

I'm trying to find a solution to prevent remote machines determining the source IP of my webserver. This is to hide the webserver's actual IP, helping avoid DDoS attacks. Incoming requests are ...
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1answer
268 views

Connect KVM virtual network to internet

I have a CentOS server running KVM and need to connect a virtual network to the internet. The network must be routed or NATted, it must not be bridged (port security). If possible, I would like to ...
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1answer
110 views

Open VPN redirect all trafic from TAP/tun interface to netowrk interface

I want all my traffic redirected to the OpenVPN tunnel. I used the directive push "redirect-gateway def1" but the Tap interface on the server is not routed to the internet. How can I do it on ...
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1answer
343 views

Virtual box linux routing

Sorry for the basic question but I cant figure this one out. I want to set up a small network of linux servers for testing purposes. So I have a host server running virtual box with the following ...
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1answer
178 views

Linux ( Fedora 15 ) multiple ISP and NAT routing

So I have my system running Fedora 15 and currently with a DSL line. The line provides a static IP along with static route, DNS. I run a web/E-Mail/DNS server from this IP. It also supports a NAT'd ...
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1answer
447 views

pfsense firewall filter rules behind nat?

i am new in pfsense i have vmware which pfsense and windows xp are installed on them pfsense in using ip 192.168.44.1 for LAN and 192.168.121.129 for wan (which is NAT) my win xp ip is 192.168.44.2 ...
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1answer
220 views

port forwarding to access services on servers behind NAT

I have some security camera systems in different locations, each location does have internet, the ISP is NATing all the IPs so theres no way to open ports to my systems. My solution was to rent a VPS ...
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1answer
623 views

Cisco ip nat overload algorithm

I have a cisco 7206 vxr with 15.0 ios(c7200p-adventerprisek9-mz.151-3.S0a.bin) .I configured the overloaded nat there. some of confs: ip nat pool nat a.b.c.2 a.b.c.254 netmask 255.255.255.0 ip nat ...
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231 views

NAT and ISP Subnet when load balancing on pfsense?

I have a pfsense box that I'm trying to plan the configuration for. I am going to be load balancing two ISP's, each with their own /29 static IP subnet. The question I have is in relation to the way ...
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1answer
80 views

NAT ports - how do they work?

I have the following network schema: Computer A: three nics: NIC 1 (eth0): dhcp, public internet NIC 2 (eth1): static 192.168.1.1, gateway for Computer B NIC 3 (eth2): static 192.168.2.1, gateway ...
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404 views

Does hole punching require a UDP rendezvous server Or could it be a TCP one?

I'm trying to get my head wrap around this issue... I would like to connect two users... Those users are already connected to a TCP server, which is aware of both public ip and connection TCP port. ...
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1answer
98 views

ASA permit only one host to *.xyz.com

I want to allow a host to download some updates from *.xyz.com (in internet). How should I permit only this host from my inside network to access *.xyz.com on ASA, access can be via http? At moment ...
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503 views

iptables and virtual machines of KVM, no ping, no ssh from VMs

Hi everyone :) I have two virtual machines KVM. I did two alias to eth0 - eth0:0 and eth0:1 and put them on an external IPs (eth0:0 - 89.114.122.3, eth0:1 - 89.114.122.4)​​. Now the problem is: ...
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1answer
99 views

iptables and DNAT. quick question

So I have a machine with a single interface. It has 2 ip addresses (eth0: 192.168.2.3, eth0:1 192.168.2.4). I'd like to take any traffic coming in on 192.168.2.4 and NAT it to an external ip ...
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72 views

MPTCP router - How can i share access to LAN network?

MPTCP is a emerging protocol that is able to split one TCP session over multiple links. In order to do that the source and destination have to be MPTCP capable. I have configured MPTCP on a linux ...
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47 views

VmWare : listening nat in promiscuous mode

This document describe how NAT in VmWare works. Next picture is from that document. Is there way to configure Virtual Ethernet switch in that way: All packets arrived from nat send to specified ...
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263 views

Windows Server 2012 R2, multiple Hyper-V Virtual Network Switches for multiple VMs

I want to configure something like this: I have one NIC, and have been given 3 IPs by datacenter, on my server which is running WS2012R2, with 10 VMs on hyper-v. Windows Server 2012 R2 (host) one ...
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115 views

Why is an ack response being sent to the wrong gateway?

I was trying to determine why a packet forwarded by iptables to my internal lan is returned on the wrong gateway. Having investigated this further, I determined that, at least in the case of one of ...
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57 views

Where can I find the range of IP addresses of my container OpenVZ

I'm looking for the "range of IP addresses of my container"... Where can I find those ? /etc/network/interfaces ? ifconfig ? I don't know and I can't find any answers... I need it for this tutorial ...
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111 views

Amazon EC2 Nat Instance - goes out but not back in

I've followed Amazon's steps and list what I've done. I've created 6 subnets (4 private SN1: 10.50.1.0/24, SN2: 10.50.2.0/24, SN3: 10.50.3.0/24, SN4: 10.50.4.0/24) and 2 public (SN5: 10.50.101.0/24 ...
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226 views

Socksify TCP connections reaching a gateway IP — preferably without iptables

I have Virtualbox installed on Debian with a few virtual machines. I can't install anything in the guests, and I use host only networking, vboxnet0. The host IP in the host network is 192.168.56.1, ...
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155 views

Cisco ASA, Windows Server 08, PPTP/GRE issues

I am at the end of my rope on this one. I am trying to simply forward pptp/gre through a Cisco ASA to my Windows server. Here is what I have done: Access Rules: OUTSIDE ...
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258 views

Issue with Nginx, http authentication and dynamic IP address

I am trying to get Nginx as a reverse proxy to authenticate users performing inbound http requests. My ISP provides me with a dynamic IP. I am not sure how to configure my ADSL router (NAT rules). ...
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161 views

NAT (MASQ) with vpnc daemon

I'm just setup vpnc daemon and setup tunnel, interface is up everything is OK. I'm try to share this tunnel for LAN using two files for iptables MASQ. First for starting up: cat ...
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250 views

Are my NAT rules in ASA 8.6 correct

I am working on converting some PIX rules to ASA 8.6 syntax. Do the following achieve the goal? Assumptions: outside's IP address is 66.66.66.5/29 The outside IP address I want things translated ...
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88 views

Routing static IPs

This is probably a simple question for you experts. I have a BT infinity business broadband account, that offers 5 static IP addresses. I'm trying to expose a server on one of those addresses. This ...
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558 views

Cisco 1921 - Using NAT (NVI method) between VRF's slow performance

I'm setting up a Cisco 1921 with two VRF's: one to the internet and one to the LAN. The LAN is in private address space so source address translation needs to happen when the packets leave the ...
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113 views

Why NATted packets have different source ip addresses?

I've got ubuntu box with nat. Here is the problem: root@office.redhelper.ru:~# tcpdump -i tap0 host 194.190.8.141 -n tcpdump: verbose output suppressed, use -v or -vv for full protocol decode ...
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130 views

set DMZ server on modem that not support DMZ, using port forwarding

I have to see an application server from outside of my network, but the modem that I am using is a Zyxel P-660-HN-T1H that not supports DMZ server configuration.So, which port(s) I should forward to ...
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132 views

Multihoming, NAT and ICMP

My router is the default gateway of a LAN and is multihomed. ISP2 is used for HTTP, HTTPS and ISP1, the default gateway of the default routing table, for the rest of the traffic. Similar questions ...
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589 views

Cisco 881 losing NAT NVI translation config after reload

This is a weird one, so I'll try to explain in as much detail as I can so I'm giving the whole picture. As I've mentioned in my other questions, I'm in the process of setting up a new Cisco 881 as my ...
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524 views

blue screen (bsod) on windows server 2012 + hyper-v + routing and remote access (rras) nat

i have a dell r710 running windows server 2012 and hyper-v with 1 x windows server 2008 r2 guest (which i've just migrated from a server running windows server 2008 r2 with hyper-v, by re-creating a ...
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95 views

port forwarding using 3 static ip addresses

I am new to configuring routers. We have purchased a RV016 Cisco business router that has multiwan capability. What we are attempting to do is take map services from 3 different servers and assign 3 ...
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505 views

Server 2008 NAT Internet Not Working

I'm trying to set up Routing and Remote Access on Windows Server 2008 R2, I have a network connection that I want to share the internet from to another private network. The server has two NICs which ...
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204 views

Configuring two-way NAT with iptables

I am trying to configure NAT for my VPN connection. I have one NIC with 5 configured public IP addresses and I want to use one specific IP address for this NAT config. I have enabled the ipv4 ...
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93 views

Why would my NAT Alias to my webserver not be working anymore?

We moved offices but kept the same ISP. Our IPs changed of course. The new IP info is: IPs: x.x.x.10-14 Mask: 255.255.255.248 (/29) Gateway: x.x.x.9 (seems weird that it's not 8, but ISP insists, ...
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519 views

windows server 2008 sp2 huawei 3g modem nat

first time on server fault. Like the title of my question goes, I have a huawei E153 3G modem that provides internet for a small office of 15 pcs. We just configured windows server 2008 x86 with SP2 ...
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412 views

Bidirectional NAT using iptables

I want an Ubuntu server machine to act as a bidirectional NAT. It has 2 NICs, each connected to a different network. I want it to forward connections received on eth1 at certain ports to certain ...