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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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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709 views

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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162 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 ...
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81 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 ...
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117 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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121 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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39 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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76 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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182 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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300 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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150 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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243 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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228 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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106 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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296 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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172 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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423 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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205 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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546 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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221 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
77 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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347 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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96 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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494 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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97 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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291 views

iproute and nat across devices

I've got the following configuration: vlan123@eth0 - range 1.2.3.0/24, with 1.2.3.4 assigned to it br2000 - range 10.2.3.0/24 In the ip route I see: 10.2.3.0/24 dev br2000 proto kernel scope link ...
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343 views

NFS proxy / re-export

I have a situation where I need to mount a few NFS shares on a series of clients on replicated VM networks. So their source IP addresses are not unique. In between the client and the server there is a ...
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1answer
752 views

Reverse NAT Setup for Hyper-V on Win 2008 R2

I'm trying to setup a Linux server behind a Windows Hyper-V host that will help supply some of the services (SSH, HTTPS, etc). However getting RRAS configured for reverse NAT (port forwarding) turned ...
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387 views

Inbound connections using Internet Connection Sharing in Apple/Mac/Leopard

I have a Mac mini which I'm using to give some other devices wireless access, by sharing it's Airport connection with the local ethernet, and that is plugged into a switch. All devices can get online ...
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1answer
158 views

Load balancing + NAT issue on BNT GBE 2-7 gear

I've got troubles configuring an Hardware load-Balancer with NAT functions. I have the following architecture: Internet ===> VIP (public) LB (private ip) ====> private addressed servers When a ...
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301 views

If I suspend and resume my vmware host vista box, I have to restart the VMware NAT service or my guest Linux DNS requests won't resolve

If I suspend and resume my VMware host (Workstation 6.5) Vista box, I have to manually restart the VMware NAT service or my guest Linux (Ubuntu) DNS requests won't resolve. I can ping boxes on the ...
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58 views

postfix - connection refused from behind NAT

When attempting to telnet postfix from a different host in the same LAN through the FQDN (and thus the LAN's public IP), the following error occurs: root@mailer:/var/log# telnet mail.domain.com 25 ...
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207 views

OpenVPN tun routing (can ping tun interfaces) with mikrotik and NAT on both ends

Problem The Mikrotik site is unable to ping anything on the server site. The Server site is less important right now. OpenVPN Server config is on LINUX port 1194 proto tcp dev tun ca ca.crt cert ...
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63 views

Cisco 887VA Port Forwarding Not Working

I have a Cisco 887VA connected to our BT Business Broadband line. We also have another modem on a seperate connection which also handles our DHCP. The Cisco is plugged into our network switch, as is ...
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107 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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122 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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536 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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445 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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93 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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470 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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183 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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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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471 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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244 views

pass source port to app server behind haproxy

I have a haproxy configuration run in http mode. I pass requests to backend java servers. I use forwardfor option to get client ip in backend server. I want to get source port in backend server but ...
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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 ...
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560 views

Switching from BT Router to Tomato - How to route an external IP block without using 1:1 NAT?

I've been struggling with an issue here at my office for at least a couple of days, and I've tried googling to no avail. I'm admittedly more of a coder than a network guy, so please bear with me! ...
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805 views

Endian Destination NAT

I have installed Endian Community Firewall 2.3 and am clearly misunderstanding/doing something wrong with it. I'm trying to create some destination NAT rules to allow incoming connections to various ...
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381 views

How to configure Sonicwall NAT across a P2P T1?

The setup: Location 1 = L1 Location 2 = L2 L1 Computer [192.168.1.2] L1 Sonicwall LAN Interface X0 [192.168.1.1] L1 Sonicwall LAN Interface X2 [10.10.11.1] L1 Adtran T1 Router [10.10.11.2] L2 ...
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296 views

Unable to ping through gre tunnel

I have 4 machines machine 1 has ip address 172.13.0.40/24 machine 2 has two ip address 172.13.0.1/24 and 172.12.0.1/24 machine 3 has two ip address 172.12.0.50/24 and 172.17.0.1/24 machine 4 has ip ...
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OpenSwan VPN pings but other traffic fails

I'm setting up a VPN server using OpenSwan, to establish site to site VPN. Site A has the OpenSwan server, sitting behind the SOHO router (ports 500 and 4500 forwarded and default route to subnet B ...