Network Address Translation, a technology used to translate a private IP address into a public IP.
1
vote
1answer
16 views
Router/NAT and IP/TCP header checksum
We know that IP/TCP has checksum mechanism to guarantee communication reliability.
However, when a IP/TCP packet is relayed by router or NAT, the IP header may be modified, if if the router/NAT ...
0
votes
0answers
22 views
connecting to the internet while nat is disabled
I have four PCs, and i want to use one of them as a web server, but i still want to surf the internet from the four PCs at the same time.
in Egypt we have an ISP called "tedata" which offer three ...
0
votes
2answers
29 views
Route/NAT/Port forwarding for one port only?
I'm not sure what is the correct term to use and I don't know what tools should I use.
The only thing I have is a goal which I'd like to accomplish.
I have two linux machines(A and B) and a remote ...
0
votes
0answers
16 views
OpenVZ: using subdomains for containers with private IPs
I am running SolusVM Master to control OpenVZ containers. I only have one public IP which is assigned to the hardware node (the actual machine). all the VPSs (containers) get private IPs which look ...
2
votes
2answers
75 views
ssh through a router without port fowarding
I have a linux server, and I want to put it in a home network behind a router. I need to ssh to this server sometime from outside, but I don't want to set up port forwarding because I don't have ...
0
votes
0answers
25 views
VMware Fusion or Player VMs Default Gateway IP Device
I can't seem to find the device corresponding to the default gateway configured in VMs with NAT networking. Let me explain.
If I issue route -n on my Ubuntu VM, which is running on either Windows ...
3
votes
1answer
1k views
Why is this iptables rule that does port forwarding not working?
I have a server bound to localhost:7060. It is using ipv6 socket instead of ipv4. Below is netstat outout.
# netstat -an
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp ...
0
votes
1answer
15 views
How to ssh my desktop(ubuntu) from outside network [duplicate]
I have set up simple ssh server by using openssh on my Ubuntu.
I tried to ssh it from my Mac, which successful. But my mac is in the same subnet, which behind same router at my home. my ubunut local ...
1
vote
1answer
46 views
Why has this organization reserved a public address space when they are being used in a private network? [closed]
In this organization, all servers and personal computers that I have worked on have a static IP belonging to the Public address space assigned to it. There must be NAT-based firewall/s as my external ...
0
votes
1answer
24 views
How can I estimate the number of feasible mappings for a NAT router..?
If I have understood correctly, a device performing NAT cannot do more than :
Total number of mappings = (Number of out-going Internet IP addresses)
x (Number of Ports)
Is this correct..?
0
votes
0answers
33 views
How does basic NAT (one-to-one) connect two IP networks that have incompatible addressing?
In basic NAT, we have the source IP address, IP header checksum (and any higher level checksums that include the IP address) of the outgoing packet are replaced with another IP address and the reverse ...
6
votes
8answers
10k views
How to get my external IP address (over NAT) from the Windows command-line?
The Windows "ipconfig" command can only show me the parameters from the Ethernet interfaces from my machine (even with the ipconfig /all argument). It can show detailed information about the ...
0
votes
4answers
2k views
How to do port forwarding in D-link Glb802c?
I have some questions about port forwarding on my D-Link Router GLB-802C.
For example:
My local machine's IP is 117.1.1.81
My router's IP is 117.1.1.1
My Public (Web) IP is 117.16.1.1
My ...
0
votes
1answer
81 views
Cannot reach specific public IP
My server (runs on Ubuntu 12.04) is behind a NAT and has to access a specific service that has a public IP address (64.*.*.*).
The problem is that I cannot reach that specific public IP (all other ...
0
votes
2answers
2k views
Will disabling NAT on my wireless router cause a performance hit on my DSL router?
I have a Thomson TG508v2 router/modem and a brand new AirPort Extreme connected to it.
At first, I set the AirPort Extreme to "share a public IP", which enables DHCP/NAT. Everything works great but I ...
-1
votes
0answers
37 views
accessing server internally using it's public ip address [closed]
Accessing a server from internal pc using the server public ip address
public users can access the server externally
and internal user can access the sever internally using the server internal ip ...
3
votes
1answer
2k views
VirtualBox NAT over proxy
I use VirtualBox 4.1.8 on a Ubuntu 10.04 host system. I have an HTTP proxy server on the host system.
How do I configure the VirtualBox to NAT the virtual machine's network and use the HTTP proxy for ...
3
votes
6answers
4k views
VMware Player loses internet connectivity
Periodically, the internet simply stops working in my virtual machine, and the only way I can get it working again is to restart the host computer. Since I use the virtual machine specifically for ...
0
votes
0answers
18 views
redirect traffic from 2 Ubuntu external NICs to specific internal hosts
I am having problems redirecting incoming traffic to 2 external facing interfaces on my Ubuntu 12.10 server to 2 separate internal hosts. I am able to redirect incoming traffic on my eth0 just fine to ...
0
votes
0answers
24 views
Nat IP to another
Is it possible for me to NAT one IP to another, I'm connecting in site-to-site VPN via windows2003 machine it have different IP say 172.19.0.1 and I'm required to present my IP as 192.168.x.x on the ...
0
votes
0answers
66 views
How do I make my PPTP VPN work without disabling NAT?
Yesterday, I tried to connect my home computer to the VPN at my workplace using PPTP and the wizard from Windows 7. It's very straightforward, I fill in the data, etc.
When I try to connect, Windows ...
1
vote
1answer
76 views
Does a Wi-Fi range extender create a separate network?
Would a Netgear range extender, for example WN2000RPTv2, create a separate network? I wasn't able to tell by looking at the user manual online. How do these things generally work? Does it just, as the ...
4
votes
3answers
379 views
How to host a webserver through NAT?
I've come across many "How to host something while behind NAT" but none are like my situation (I knew how to host a server through a simple NAT anyway).
This is how my ISP works...
First, start off ...
24
votes
7answers
47k views
How to do networking between virtual machines in VirtualBox?
I have two virtual machines in VirtualBox. I would like to do networking between them. For the moment I have the default configuration on both, but they seem to have the same IP-address 10.0.2.15. I ...
0
votes
0answers
20 views
There is no nat option at RRAS
i am trying to setup vpn that clients can connect internet thorugh it
when i use wizard i don't see nat option under RRAS ip4 panel
how can i solve this problme
it is also asked here but no answer ...
1
vote
2answers
266 views
Firewall in front of device with public IP address
Is it possible to have a firewall in front of a device with a public IP address without getting in the middle of NAT? I have a server that I need to put on the internet, but I want to put a firewall ...
2
votes
2answers
434 views
Is it possible to statically assign public IPs and use DHCP on the same router?
My ISP has given me a set of public IP addresses I can assign to various devices.
But they have been controlling everything, and I've had to call them to make any changes to the configuration.
I'm ...
2
votes
3answers
2k views
NAT vs public IP (and blocked ports)
I have a problem with my ISP. They say that they don't block any ports and I have public IP, while I think these both statements are false. Before I talk to them again (which is really tough when my ...
0
votes
2answers
71 views
A server which uses 2 IPs and is needed to give service (under NAT)
I have an internal server, which uses a certain service. This service listens on a port, and speaks on a different port. The problem with the service is that it can't listen and speak on the same IP ...
0
votes
2answers
80 views
Iptables: Allow Internal LAN to access INTERNET
I have an internal network behind my router on eth0, and I have my router connected to the internet thorugh wlan0. I can't access the internet from inside the lan, how can I fix this?
wlan0: ...
0
votes
1answer
55 views
How do NAT or proxy react to incoming TCP SYN packet?
In some messaging systems, two messaging clients send/receive packets directly from each other in chatting or voice call. I think the basic mechanism is (TCP for example): these client programs open a ...
2
votes
3answers
119 views
Virtual workstation on my dedicated server advice
I've got a dedicated webserver (debian 6) running with plenty of unused capacity.
While the remaining capacity isn't used i thought it'd be nice to create a virtual machine to work on using RDP.
What ...
0
votes
1answer
55 views
How do I put a computer outside of a NAT, giving it a separate IP address?
I have two servers running behind my D-Link DIR-655 NAT router. Obviously, I cannot allow outside access to both of them simultaneously without putting them on different external ports, which I don't ...
6
votes
3answers
193 views
Two websites give different values for my IP
I just found something curious:
http://whatismyip.org/ says my IP address is 82.44.14.246
http://www.whatismyip.com/ says my IP address is 31.52.118.197
I'm based in the UK and behind a router ...
0
votes
1answer
40 views
OS X natd, nat between en0 and tap0
I'm trying to connect a tap0 and en0 interface with the natd. The (simplified) background is:
I have one application running on a smartphone and a simple UDP Server running on my laptop. The UDP ...
1
vote
0answers
57 views
How can I troubleshoot vmnet routing on my MacOShost and Linux guest with VMWare Fusion?
I am running a Linux guest VM on my Mac (MacOS 10.7.5) with VMWare Fusion 5.0.3.
The Linux guest VM expects to have a specific IP address - 192.168.56.10
The VMs network is set to be NAT ("Share ...
0
votes
1answer
32 views
How to use comtrend router to create NAT and use same public IP for all LAN devices
I think the title says it all.
I would like to use my Comtrend router in a way that all devices connected to the router (ethernet and WiFi) use the same public IP for going to the outside world. Is ...
0
votes
0answers
50 views
How to access Ubuntu running Openfire from the Internet (Public IP)?
I have Openfire installed in my Ubuntu server using port 7070. Now using ipchicken I found my public IP (example: 111.11.000.0/7070). When I try connecting from another PC through connected to the ...
0
votes
0answers
57 views
DNS not working on Host Only - NAT firewall
I am setting a private network connected to a firewall that filters the access to internet.
So far I have a ubuntu virtual machine (the firewall) with two interfaces, host only and NAT, also there is ...
0
votes
0answers
53 views
UDP NAT punching for linksys wrt54g
I could not explain the strange NAT behavior, hope someone could help:
I have a linksys wrt54g router at home.
Client sends UDP keep alive packet from 192.168.1.20:16688 (nat outside public IP/port ...
1
vote
3answers
284 views
NAT and UDP replies
Sanity check please.
If I send UDP packets from Machine A behind a NAT to Machine B's port N, where Machine B is outside the NAT (elsewhere on the Internet), can I reasonably expect that NAT to pass ...
0
votes
0answers
25 views
How to set up NAT for a given hostname:port on Server 2008r2
I have a Server 2008 r2 instance on my network running DNS and DHCP, it also has various web services running on it on different port, for instance:
myserver:80
myserver:8080
myserver:3030
is it ...
0
votes
1answer
42 views
Simple program to turn a server into a client and vice-versa?
What would be a simple to use program for Windows that would do the following:
Computer A unknown TCP client wants to connect to computer B's unknown TCP server.
Both are behind a NAT.
Computer A ...
4
votes
2answers
102 views
How to block a particular computer behind a NAT
I run a small hostel and have the following network configuration:
Router1 (192.168.1.1) ─┬─ (192.168.1.2) Ubuntu Samba+SSH Server
├─ (192.168.1.X) Router 2 (192.168.2.1) ─┬─ ...
1
vote
0answers
112 views
Routers and NAT hole punching? [closed]
I'm trying to understand why UDP hole punching works.
Given peers A, B behind a NAT router and Server with port 80 open.
A sends a packet to Server from port 1234. This causes the router to open a ...
2
votes
2answers
126 views
VMware multiple guest systems with own VPN
I'm trying to set up a Linux box that runs multiple Windows guest systems in VMware, all of which connect through the host internet connection through NAT, but each guest using its own VPN connection.
...
0
votes
1answer
135 views
ddwrt not relaying external ip addres in from an external request
I have a problem where all external requests are logged or interpreted like they are originating from the router as the log shows shows the routers ip rather then the originating clients IP. I'm ...
2
votes
2answers
71 views
How does Http server distinguish between computers behind a router
Http Servers operate at port 80. Yet NAT routers as most are these days assign port to outgoing requests so they would know when request is returned that which computer connected to it, it's suppose ...
2
votes
2answers
428 views
Using iptables SNAT based on source interface and ip address
I would like to change source ip address according to ip address and interface it came in. Let's consider following example:
-----------------------------
| |
| ...
0
votes
1answer
224 views
How do you set up a VirtualBox CentOS 6.3 VM . . . in order to access it via SSH from a remote host (not host to guest)?
What should I do?
I installed VirtualBox 4.2.6
I installed CentOS 6.3
It's powered on
# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
link/loopback ...
