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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NAT with iptables: need help understanding

i am trying to learn NAT with iptables but i ran into some confusions. i am having two virtual machines with ips 18.43 lets say B and 18.42 C running webservers on port 80. i need to NAT every ...
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Cisco ASA 5540_outside to inside traffic NAT

This is for a test lab setup: landing server(192.168.49.26)---(.49.25/29)Cisco6500(.49.1/29)---(49.2)Cisco ASA(x.x.55.81)---External The C6500 is the core of the test lab to which the "landing ...
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Linux as a gateway (no NAT)

I'm trying to configure a linux server as a gateway/router, but I can't get it to work, and all information I've managed to find is NAT-related. I have a public IP block for the gateway and devices ...
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Windows Server 2008 R2 drops packets

I seem to be having strange problems with my WS2008R2 Active Directory + DNS + DHCP + NAT configuration. It look to be some sort of an issue between DNS, NAT and LDAP. The first consequence is some ...
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how to NAT site to site VPN web traffic?

I have 2 Cisco routers and they are connected via GRE over IPsec. All of the traffic from the first router is being routed to the 2nd router with a default route. I need to access internet from the ...
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Redirecting DNS port to a specific DNS server

I use a ubuntu server as a router for my users on a NAT network. I want to force all users to use a local dns server setup on the network. Even if they use a public DNS server in their client ...
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User has problem with loading speed of website

We are using nginx as reverse proxy. There are 4 servers (1x nginx, 2x uWSGI, 1x DB + Memcached). One user told me some time ago, that he has for 3 months problems with loading speed of website. Every ...
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Internal and External IP Addresses with an SSL Certificate

I'm setting up a web server that has an internal IP address and an external IP address. e.g. Browsers on the network request mysite.example.com and get 192.168.200 Browsers outside the network ...
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Port forwarding on Fortigate 50B

I have serious problems setting up port forwarding on a Fortigate 50B. The unit is basically running as factory default, the wan1 interface is connected to my fibre optic internet modem, and my lan ...
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iptables for transparent NAT

I'm trying to transparently route traffic of one Xen VM through another, like so: ------- 192.168.250.4 192.168.250.3 --------- | VM1 | ...
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Windows Server 2008 Routing / NAT - USB Wireless adapter not showing up

I have a multihomed system running Windows 2008 Server Enterprise, and I'm trying to share an Internet connection on a USB wifi adapter with the other networks attached to the system. To that end, I ...
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Namebased NAT Lookup

I have a dedicated test server with a single public facing IP that has VMWare Server on it and 4 test environments hooked up through NAT. This works fine to RDP into the Windows Server 2003 host ...
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Destination NAT Onto the Same Network from internal clients

I have a DSL router which acts as NAT (SNAT & DNAT). I have setup a server on internal network (10.0.0.2 at port 43201). DSL router was configured to "port forward" (or DNAT) all incoming ...
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Packets dropped due to NAT? Firewall? Unroutable private IP addresses?

Preliminary note This question is out of academic interest. I know how to work around the limitation. I use this setup to control access from one subnet to the other on IP level which works great so I ...