Network Address Translation, Automatic Port Forwarding

Does the Airport Extreme do
Network Address Translation? Do I have to do something to make NAT functional?
Does the Airport Extreme automatically forward ports? Or is this something I have to do manually
sorry if this is discussed already but a Search of Forum did did not yield the information I need.

Hi Barbara, welcome to the discussion area!
+Does the Airport Extreme do Network Address Translation?+
Yes
+Do I have to do something to make NAT functional?+
No, if you have the device configured as a router with the Connection Sharing settings set to Share a public IP address so that the AirPort Extreme is handling the chore of assigning IP addresses to connected devices.
If you have the AirPort Extreme configured as a "bridge", then NAT is handled by the router that is upstream of the AirPort Extreme.
+Does the Airport Extreme automatically forward ports? Or is this something I have to do manually+
Port forwarding must be setup manually on the AirPort Extreme using AirPort Utility, the application used to setup the AirPorts.

Similar Messages

Tuxedo and Network Address Translation(NAT) at Firewall

We made a sucessful connection through the firewall without Network Address Translation
(NAT)on the firewall, from one network to the other and what we found happened
was that the client machine makes a connection on port 8090 and then sets up a
successful connection to the server (WSL).The client then very soon afterward
makes another connection on
another high-port and everything works (WSH connection).
Whats not happening with NAT is that the second connection is not being made to
the firewall. The firewall and the router are not blocking the call. It is just
not being made.
Thanking you in advance!!!
Nathaniel

Nathaniel,
Take a look at the WSL -H option at
http://edocs.bea.com/tuxedo/tux80/atmi/rf540.htm#1534543
Regards,
Peter.
Got a Question? Ask BEA at http://askbea.bea.com
The views expressed in this posting are solely those of the author, and BEA
Systems, Inc. does not endorse any of these views.
BEA Systems, Inc. is not responsible for the accuracy or completeness of
the
information provided
and assumes no duty to correct, expand upon, delete or update any of the
information contained in this posting.
Nathaniel Sebolai wrote:
We made a sucessful connection through the firewall without Network Address Translation
(NAT)on the firewall, from one network to the other and what we found happened
was that the client machine makes a connection on port 8090 and then sets up a
successful connection to the server (WSL).The client then very soon afterward
makes another connection on
another high-port and everything works (WSH connection).
Whats not happening with NAT is that the second connection is not being made to
the firewall. The firewall and the router are not blocking the call. It is just
not being made.
Thanking you in advance!!!
Nathaniel

GC 11G AND Network Address Translation

HI,
I have simple question , Is Network Address Translation supported with GC 11g. I know it is not on 9i.
thanks.

I can't find anything on this on the internet. So creating a SR is an option.
The only note I found was: Agent Fails to Upload Through Load Balancer, Secures Successfully [ID 1149610.1] suggesting you can use NAT.
Eric

Carrier Grade Network Address Translation (CG-NAT)

Hello,
I live in the UK. One of the largest ISPs, BT, has begun trialling carrier grade network address translation (CG-NAT). In a nutshell, this introduces double NAT - first your broadband router, then the ISP's "router". This is before the ISP has introduced IPv6.
I fear it is only a matter of time before my ISP also introduces CG-NAT. Will/does Skype work in a CG-NAT scenario? If not, what are my options?
Kind regards,
Anwar

I am new to Oracle VM. The dom0 and domU are set up by someone else. So I don't know the details. In the domU, I can't even ping the 10.244.69.35 address of the dom0.
# ping 10.244.69.35
PING 10.244.69.35 (10.244.69.35) 56(84) bytes of data.
From 192.168.200.50 icmp_seq=2 Destination Host Unreachable
From 192.168.200.50 icmp_seq=3 Destination Host Unreachable
From 192.168.200.50 icmp_seq=4 Destination Host Unreachable
The Cisco switch on the 10.*.*.* network is owned by IT and I can't change anything on it. This is why I try to set up NAT on the dom0. I would appreciate any help so that I can access the 10.*.*.* network from the domU.

How do I disable Network Address Translator on my macbook?

I am getting a notice that Back to my Mac will not work because I have more than one device on my network providing NAT (network address translation). It says to try disabling NAT on one of the devices. How do you do that?

Airport Extreme needs to be in Bridge Mode.
Here: http://support.apple.com/kb/TS1208

On UPnP and NAT (Network Address Translation)

Why UPnP is an often asked Question.
This article goes a long way to say why.
A couple of Quotes
*What is UPnP?*
Universal Plug and Play (UPnP) is an architecture for pervasive peer-to-peer network connectivity of PCs and intelligent devices or appliances, particularly within the home. UPnP builds on Internet standards and technologies, such as TCP/IP, HTTP, and XML, to enable these devices to automatically connect with one another and work together to make networking - particularly home networking - possible for more people.
*Are there other ways to solve the problem of NAT traversal? If so, why is using UPnP the best choice?*
Yes, there are other ways to solve this problem, but no other mechanism currently exists as an industry standard to address this problem in an automatic way for the consumer and in such a universally-applicable way for the developer.
Simply Automated Starter Package
Other approaches require either manual intervention by the user or they require special development efforts by the Internet gateway device vendor and the software developer to handle the NAT traversal needs of specific applications. As a result, UPnP is uniquely able to solve this important problem.
*Consumer does the work.* The manual intervention methods of NAT traversal require a consumer to use a browser, a graphical user interface-based tool on the PC, or a command line interface tool on the PC to change some settings on the Internet gateway device in the home. While some technical enthusiast users have little difficulty with this, many consumers do not feel comfortable doing this. Further, many consumers may not even realize that NAT traversal problems are interfering with their use of services across the Internet. _The user may be attempting to play a multi-player game or engage in some other peer-to-peer service but find he or she cannot connect for some reason._ This leads to troubleshooting, support calls, customer dissatisfaction, and reluctance on the part of the user to try new services or experiences in the future.
*Developer does the work.* To avoid requiring the consumer to solve this NAT traversal problem manually, some Internet gateway device vendors have written and included application layer gateway support into their devices. This application layer gateway software is designed with specific applications in mind. In other words, the device vendor writes and tests specific code that will automatically enable one application to go through the NAT. If the application software is updated, the application layer code the device vendor wrote may have to be updated and tested again. This one-at-a-time way of chasing the NAT traversal problem is manageable for device vendors when there are only a few peer-to-peer or relevant applications to consider, but this approach does not scale well to 100s or 1000s of applications, can be very expensive to pursue, and likely requires specific knowledge of how each of these applications function. The better way to approach this problem is to have the device vendor add software or firmware to their device once to understand UPnP and have other devices and software be able to communicate with the NAT device using this same technology. UPnP is uniquely able to fulfill this role today.
I have underlined a passage in the last.
I hope this helps in some way.
6:58 PM Tuesday; January 1, 2008

          Look for bindAddr in the weblogic.properties doc.
          weblogic.system.bindAddr
          You can use a dns name instead of an ip address
          Mike
          David Chen <[email protected]> wrote:
          >We are planning to add a client that needs to access our weblogic cluster
          >through firewalls with IP address translation. According to the WebLogic
          >(5.1) documentation, this could be done by opening port 7001 in the
          >firewalls, and BIND WebLogic SERVER INSTANCES TO DNS NAMES. Does anyone
          >know how to bind WebLogic server instances to DNS names? Should it be
          >done in weblogic.properties?Thanks in advance,David [email protected]

How do I set a "fixed local address" and enable port forwarding?

We are using an iMac G5 with an Airport Express (bought back with the G5 so it's a bit old) and I'm trying to set up the computer so that I can use it with Bosco's Screen Share.
According to the instructions (see step 3) I need to "set your computer’s fixed address on your LAN." so that the Airport will forward a specific port. How do I go about doing this? In my network prefs the Airport is set to use DHCP. Is there something in the Airport Admin that I need to set?
I'm unsure how to go about doing this, any help is greatly appreciated.
Chris

So I should create another location (in the Network prefs) specifically for screen sharing?
If you are going to switch back and forth between the settings then go ahead but there is no need to do it.
Would I set the port forwarding in the Airport Admin under port mapping?
Yes

How to disable Network Address Translation

how to disable Network Address Translation

Hi KalaiArasu.K,
As Chen V said, please tell us more detailed information about your requirement.
In addition, please refer to the two following links to learn how to disable Network and computer from Explorer Navigation Pane:
How to Add or Remove Network from the Windows 7 Navigation Pane
http://www.sevenforums.com/tutorials/39699-network-add-remove-navigation-pane.html
How to Remove “Computer” from Windows 7 Explorer Navigation Pane?
http://www.askvg.com/how-to-remove-computer-from-windows-7-explorers-navigation-pane/
Note: Since the website is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information. What’s more, incorrectly editing the registry
may severely damage your system. Before making changes to the registry, you should back up any valued data.
For your infomation, plase refer to the following article to learn how to configure a Registry Item via GPO:
Configure a Registry Item
http://technet.microsoft.com/en-us/library/cc753092.aspx
Regards,
Lany Zhang

Making internet sharing work (Issue with Network Address Translation)

Trying to use internet sharing to enable a BluRay player to get access to the internet for firmware updates, BDLive, etc.
MacBook Pro is setup with Airport (en1) enabled and connected to the internet.
Ethernet port (en2) is set to "Configure IPv4: Off."
I have configured the /etc/bootpd.plist file with the following configuration as mentioned in http://www.macosxhints.com/article.php?story=20071223001432304&query=xbox%2B360.
<key>replythresholdseconds</key>
<integer>0</integer>
After starting up Internet Sharing, the following is observed:
Ethernet port(en2) is reporting 192.168.2.1 as its IP address in Network Utility but not in the Network System Preferences Pane.
The Mac is responding to the DHCP request from the BluRay player and the BluRay is assigned an IP address of 192.168.2.2/24 with a default gateway and DNS of 192.168.2.1.
So you think there would be success with this but wrong. The system log is reporting that NATD "failed to write packet back (No route to host)" or "failed to write packet back (Host is down) and the connection test on the BluRay player is consistently failing.
Even manually configuring the ethernet port on the Mac is resulting in failure. Is there something else I'm overlooking?
Hoping someone can spread some light on this. Thanks.

Ashy Larry wrote:
So you were able to get it to work then?
I ask because I want to get the Sony BDP-N460 Bluray player for my parents, as it's the only Sony player aside from the Playstation 3 that is Netflix capable. I'm not sure why their other wi-fi enabled player doesn't have Netflix on it. I suppose I could get them a Playstation 3, but they don't really need one.
More than likely that Sony is positioning its products that way so people do go for the PS3 and increase it install base and possibly get you to by a game or two.
I want to connect the player to an old iBook G3 that's running 10.4 and share its connection. I did this successfully with the iBook and my Xbox 360 and wanted to know if it was possible to do so with a Bluray player.
I would bet that you will be able to accomplish this if you were able to get a 360 running through it. Just ignore the Blu-Ray player's test connection tool and try to connect to Netflix. Just play it safe and buy it through a retailer like Amazon where returns are hassle free.

ASA 5510 Network address translation through an internal network.

Is it possible to perform static Nat's through an internal network?
Here's my situation I have a ASA 5510 with a public outside interface (let’s call it 68.68.68.1), and I have an inside private IP address (192.168.1.2/24). The inside IP address leads to a 4900m with that interface being configured with a 192.168.1.1 (no switching). On the 4900 M I have several VLANs one of them is an internal DMZ of sorts. (192.168.2.0/24). Within this DMZ network are several Web servers which need to be associated a public IP address (68.68.68.x).
Every time I configure a static Nat to associating a public IP address with an internal IP address within the DMZ, packet Tracer on the ASA informs me that the packet gets dropped at the static Nat and I cannot figure out why this is so.
Safe it to say my question still stands is it possible to Nat (68.68.68.222 to and 92.168.2.60) given the configuration above, and how would I go about configuring in such the manner above so that I acn apply static nat through the 192.168.1.0 network to reach the 192.168.2.0 network.
Any help on this matter is greatly appreciated. Thank you.

more information as requested
csc# sh int ip br
Interface                  IP-Address      OK? Method Status                Protocol
Ethernet0/0                192.168.1.2   YES CONFIG up                    up
Ethernet0/1                172.16.2.3      YES CONFIG up                    up
Ethernet0/2                192.168.12.1    YES CONFIG up                    up
Ethernet0/3                68.68.68.1   YES CONFIG up                    up
Internal-Control0/0        127.0.1.1       YES unset up                    up
Internal-Data0/0           unassigned      YES unset up                    up
Management0/0              192.168.19.1    YES manual administratively down down
csc-ssm# sh nameif
Interface                Name                     Security
Ethernet0/0              inside                   100
Ethernet0/1              %^&*%$                   100
Ethernet0/2              @#$%&*()                  30
Ethernet0/3              outside                    0
Management0/0            management               100
nat (inside) 0 access-list nat0
nat (inside) 1 serverNET 255.255.255.0
nat (inside) 1 Server 255.255.255.0
nat (inside) 1 192.168.8.0 255.255.255.0
nat (inside) 1 CorpVPN 255.255.255.0
nat (inside) 1 192.168.30.0 255.255.255.0
nat (Eng) 0 access-list ENG_nat0_outbound
nat (Eng) 1 172.16.2.0 255.255.255.0
nat (WiFi-Guest) 1 192.168.12.0 255.255.255.0
global (ENG) 2 172.16.2.10-172.16.2.50 netmask 255.255.255.0
global (outside) 1 interface

Network Address Translation in Java

Hi to all,
Can any one explain me if is possible to realize a NAT in java?!?
Are RFC's 3022 and 1918 useful for my purposes?!?
If it's possible, can anyone post the code or the link where I can find it?!?
Thanks...

To do NAT properly you need lower level access to the IP stack than Java provides. There are also a good variety of NAT servers available.
A good open source choice is Linux IPMasquerade. You can use an old surplus PC (pentium II 233 or better) with Linux and IPMasquerade and IPChains to build a quite respectable firewall and NAT server that is more secure than anything running under windows. I got over 100,000 hits on google for ip masquerade, eg. http://en.tldp.org/HOWTO/IP-Masquerade-HOWTO.
Another choice is if you use a Linksys DSL router or similar device, this will connect you to cable or ADSL and do NAT for you. The router is less than $50.00 US.
Given these conditions a NAT in java is hardly worth it.

Port forwarding to ip address only allows input of last digits

I have the Linksys BEFW11S4 router and am trying to port forward to a static ip address but the port forwarding screen is hard coded to 192.168.1.__ and only allows me to enter the last 3 digits of the quartet. Does anyone know how I can get past this? I'm trying to connect a DVR server using this static ip address.

If your ISP assigns you a static public IP address and you are required by your ISP to configure that on your router, then you have to configure the static IP, subnet mask, gateway IP and DNS servers in the internet connection section of the main setup page in the web interface of the router.
You then assign a static local IP address like 192.168.1.25 to your DVR, subnet mask 255.255.255.0, gateway 192.168.1.1 and DNS 192.168.1.1 or the DNS servers of your ISP.
You don't have to disable the DHCP server function in the router.

HT3546 How do I set up my air port extreme to do port forwarding? Running 10.7.4 I have a IP camera on my local wireless net work that I want to use from my iPhone 4s and other computers.

How do I set up my air port extreme to do port forwarding? Running 10.7.4 I have a IP camera on my local wireless net work that I want to use from my iPhone 4s and other computers.

In most cable systems, the router you have will plug into your modem and just work automatically. A NAT (Network Address Translation) router takes your external IP and hands out LAN (Local Area Network) based IPs. All of the devices you are working with right now should handle the change automatically unless you've changed from the default automatic configuration.
The problem with your wireless end of this is that the iPhone is not yet 802.11n, only 802.11g. Because that router is not dual band, all of your wifi devices will be forced to slow down to 802.11g speeds. This won't matter much for each device that's connecting to the internet, as your bottleneck is still going to be there. Where you will see slowdowns is device to device connections, like transferring data between the devices.

Port Forwarding not working correctly (BTHomeHub 2...

I recently picked up the new Call of Duty: Black Ops 2 for my pc. Playing online mathes works fine, however trying to join with my friends and connect with them for co-op fails to work. My NAT setting in game was listed as strict and my friends (both on BT) had moderate so I assumed it had to do with that.
After some research, I found out I had to forward ports to my PC which I've done but yet the game still refuses to connect. Sometimes I get lucky and, after forwarding the ports, I load up the game to be shown NAT: Open and I'm able to join my friends quickly, but after about one minute the game disconnects and my setting changes back to Strict.
Now my problem is either one of two things:
a) My ports are opening but are closing after a minute or two.
b) Something is wrong with my router.
It should also be noted that one of my friends actually had his NAT setting turn to Strict but he was easily able to forward his ports and get NAT open again. I copied exactly what he did and it didn't work. If it helps, I've also tried setting my computer up with a static IP and port forwarding to the exact IP address I set and not the device name, which still didn't work.
Thank you for any and all help. I really hope I can get this sorted soon.

Port forwarding is not likely to be the issue, there are many posts regarding NAT( Network Address Translation) issues, all over the Internet.
Here are some examples from this forum.
http://community.bt.com/t5/forums/searchpage/tab/message?filter=location&location=forum-board%3AOthe...
If you look at my port forwarding help page, there is an address you can go to to see if a port is still open. Just choose any one of the port numbers associated with your game, and see if it still shows as open.
There are some useful help pages here, for BT Broadband customers only, on my personal website.
BT Broadband customers - help with broadband, WiFi, networking, e-mail and phones.

Can only port forward port 80, other ports does not open.

I am trying to open three ports on my AE (7.6.1), but the only port that actually opens (if set) is port 80.
- The Airport Extreme is the router and no additional router is in place
- I have given the three cameras (that I want to access from Internet) static IP
- I have trired to open three ports for those (45101, 45102, 45103)
None of above ports open, but if I change one port to 80, that port opens and one camera can work. This is really strange and any suggestions or help is much appreciated!

As you don't want to use the modem as router I would recommend to reconfigure your modem into "bridge" mode. In bridge mode it works like a simple modem. You then have to configure your WRT for your internet connection (usually PPPoE for DSL or DHCP for cable). With this setup, you don't have these chained routers and the WRT has a direct connection into the internet (i.e. the WRT shows your public IP address on the Status page).
Some chained router setups shows problems with drop outs, connection loss and similar. I recommend to use only one router in home setups.
On a sidenote: port forwarding is not related to firewall functions. The reason why you need port forwarding is because a router does "NAT" (Network Address Translation). You use private IP addresses inside your LAN (e.g. 192.168.1.*). Private IP addresses are not routed into the internet. Any internet router will immediately drop packets with a private IP addresses. Thus, your router does NAT to map your private IP address to your single public IP address. It's in the nature of this mapping that unsolicited incoming traffic from the internet is dropped unless you configure port forwarding. That's simply because the router would not know where to sent a packet on a port 1234 received on its public IP address unless you tell it. Thus disabling the firewall on a router won't change a thing.

Network Address Translation, Automatic Port Forwarding

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