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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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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202 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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951 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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930 views

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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202 views

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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2answers
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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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218 views

RRAS Server 2012 R2 Not Assigning Network Info or if it does not passing NAT

I wouldn't bother with this for any other reason than the fact that the speeds I get are worth it. Cable Modem (Bridge mode) - Server 2012 R2 (RRAS) - Linksys EA2700 (Bridged as Switch) My issue is ...
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2answers
408 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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2answers
480 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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2answers
517 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
314 views

Bind docker container ports only to specific outside server address

This is the first time i address such a network "problem" to solve with docker and i need some inputs. This is my situation: Ubuntu 14.04 running NginX, ufw as firewall and docker containers to ...
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2answers
438 views

DirectAccess: Client receiving icmp error from Ipv6 address

Pardon my naivety but I have never setup DirectAccess before, I've done some research prior and was unable to find a relevant resource. Let me provide a little background and then I'll jump into the ...
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2answers
194 views

NAT-ing with iptables rewrites source IP in logs

I have the following infrastructure in place: internet [outside 81.x.x.x] router [inside 192.168.1.1] | [network 192.168.1.0/24] ...
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2answers
442 views

router: ping fails at specific time for 40 seconds

my network looks like this: ISP cable --- ISP modem/router (2 in 1) \ \--- my router --- wifi connection --- computer 1 \----------- cable connection ...
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2answers
127 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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2answers
131 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
942 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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563 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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2answers
10 views

Asterisk One Way Audio or No Inbound Calls

I have an Elastix server running in Amazon Web services, but I can't seem to resolve an issue that is causing either one way audio or no inbound calls to ring. If I set my SIP extensions to "Nat = ...
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2answers
28 views

Iptables NAT (PAT) A to B to C and back

I want to access via SSH a DB server from an outside network via a linux (CentOS) gateway with two interfaces in separate networks as it follow below: Admin PC IP: 10.21.1.8 Linux GW IP eth1 ...
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62 views

How can I use NAT or haproxy to reroute a certain host name?

I have an infrastructure where all requests made by internal subnets have to pass through a server in the "open to the world" subnet, where my NAT instance is (I'm using AWS). I want to create a host ...
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2answers
448 views

SIP Trunk for VOIP behind a SonicWALL

I appreciate this question is quite "out-there" but - has anyone had any success with VOIP over SIP behind a SonicWALL. We are having an issue with one-way audio inbound. Essentially, the person ...
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590 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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77 views

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
2k 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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249 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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2answers
316 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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2answers
582 views

How can I route some (but not all) web traffice over a VPN tunnel. Sonicwall appliances on each end

I have two networks: Network A Private 10.0.0.0/24 Network B Private 10.0.10.0/24 Both running Sonicwall ~200 appliances, connected by a VPN tunnel. I am able to reach specific internal address on ...
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92 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
663 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
242 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
825 views

ipnat.conf - map and rdr won't work!

I can't put my mind around it, before reboot I was able to ssh in from outside to my jail and right now I can't! I even rebuild the whole system and even that didn't help:( anyone have any ideas? ...
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1answer
303 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
28 views

Need help configuring NAT

First of all, the router I am using is a Cisco WRVS4400N. My company runs a software which handles the MySQL database of all of their products. The software now has an e-commerce module, so I have ...
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1answer
113 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
338 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
3k 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
136 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 ...
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1answer
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Mirotik : Client from interface 1 cant access client from interface 2

I have a mikrotik here. Both interface 1 and 2 have same network (10.10.30.0) and dhcp pool. I can ping any client on interface 1 from mikrotik and also any client on interface 2. But I cant use to ...