NAT Simply not working

Hello, This is my first time posting on this forum although I am a frequent visitor. I have setup a client with Airport Extreme and NAT is simply not working. I have NAT enabled with the proper ports routing to the proper IP addresses and the traffic does not go through.
I performed a port scan via nmap on the ports in question and the status of the ports were identified as "filtered". At least the tool recognized a service was running on the specifiec ports but the state was filtered rather than closed. After connecting a linksys router and configured it the same; I ran the same scanning test yielding ports with the status "open".
Please advise...

Yes, this button must be checked for me to enter the ports in which to be mapped. Again when I scanned the ports they were in fact recognized that services were running but the port state was "filtered". I believe this is the problem. This normally will allow connections to be spawned from the machine in question and then allow traffic but it doesn't appear to allow a external connect initiation.

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  • SA520 NAT/PAT not working with NAT address

    The SA520 I have is configured on one public IP address and an exchange server is behind it.  THe exchange server is configured with an internal address and the SA520 is performing NAT translation to a unique public address for the email server itself which is independant of the SA520.  It seems that the SA520 is sending email out the NAT address correctly at some time and at other times it seems to be sending the email traffic over the PAT address of the SA520 public address.  When this happens the email gets blocked due to spam lists.  Then the email will work again correctly.. and then go back.  If I use a 3rd party website to test the IP address sometime I get the correct one and sometimes I get the wrong address.
    Is there a way I can confirm that the SA520 NAT settings are correct to allow ALL outbound communications from the exchange server (which is behind the SA520)?  I may have the SA520 configuration wrong and it is possible that the SA520 is only providing inbound PAT for port 25.  How do I tell the SA520 to do a 1 to 1 NAT with the exchange server?

    Hi John,
    In order to establish a 1 to 1 NAT on the SA 500 series, as in your case, you must first you must first add an IP Alias for your 2nd WAN.  Next, you create a Firewall rule to "force" all or selected traffic from your NATed server (LAN) to the WAN to go out thru the IP ALIAS address.  Finally, we forward specific traffic from the WAN to your NATed Server (LAN) thru Firewall Rule(s).  See sample wan2lan bitmaps attached. Do this for each of the services that you will allow to come in thru the SA 520 to your Server.  As long as there are no other Firewall rules overlapping with the newly created rules, traffic to and from your NATed server will come/exit thru your ALIAS IP.
    We can verify this by performing a WAN Packet Trace (Administration-->Diagnostics -->Packet Trace)  After choosing Dedicated WAN as the Network to be captured, Click on Start to perform Packet Capture.  Go to your NATed server, and perform the following, on a command prompt window Ping google.com, open a browser window and open google.com.  On a remote machine, open a web page on your server (OWA?) to test incoming HTTP/HTTPS requests. Stop your capture, and save the packet capture file by pressing the Download button.  Open file with Wireshark/Ethereal and observe the source and destination address of the packets.  They should have the ALIAS address and not the WAN IP address.
    If the above step is good, then we have to take a look as to if and why your SMTP or email services are not being routed out the ALIAS interface. Repeat capture steps as above, but this time send an outgoing email, and test an incoming email by emailing an internal account from an outside email acount (yahoo, gmail, hotmail).
    If you still have failure, and you have IPS or ProtectLink enabled, can you run the steps that failed with IPS and/or ProtectLink both disabled?
    If there are issues, you can post the captures as a personal message to me.
    I hope the above will help narrow the issue a bit.
    Best regards,
    Julio

  • System unresponsive, slow, or simply not working (parts)

    Hi, I'm having big troubles recently. I just updated to the latest software updates, but some of the symptoms were there before the update.
    First of all, the menu bars doesn't show a lot of my previous icons. Including time, date, and pretty much everything else you have by default (Spotlight is there).
    Next, plenty of my applications will simply hang (mostly applications that deals with hardware stuff):
    Disk Utility (please take note, even the terminal diskutil will hang, this is important, I'll get back to it later), Image Capture (I plugged in a canon all-in-one I hadn't used for a while, one that I got with the mac) hangs totally, Finder is way too often unresponsive, *exiting a session is impossible, as well as shutting down the mac (no message, simply nothing happens)*, internet access is definetly unusable (way too long lag, too often my browser disconnects or times out note that I use Safari and Firefox).
    I tried rebooting the system so it might solve thing, but shutting it down in any way won't work, even for quitting sessions, as stated above.
    I then though about starting a whole new system (I was planning this because I wanted to clean up this one too), like the system on a drive, my files on another, backup on another, archives, etc; but Disk Utility hangs (no gui is seen, hangs before it loads).
    I also wanted to repairs permissions and fix anything like that, but.. can't use Disk Util. (both GUI and CLI)
    Source of problem I think:
    Not enough disk space - although I have been using the system with a lower disk space recently, I am now a 4GB free on a 500GB which is WAY below the recommended 15% free space at all time
    Fonts - Yes, I have lots of issue with fonts, so using Linotype Fontexplorer X I de-activated all the fonts not listed under "System Fonts" (otherwise I had too much at the same time) but I now see a lot of website using standard fonts with replacement fonts, this sounds bad.
    Possible bad updates?
    I am thinking of booting up another spare system I have (of course to prevent such problems from turning worse (everyone should have another spare system)) and then start over a whole new system.
    Any ideas on how to import files and program (and settings, if possible) in a smart way?
    I would appreciate any help because I am currently experiencing a lot of small problem rendering the whole thing useless, if you have any ideas or suggestions this would be really appreciated, thank you!
    Edit: I can't even post this a the time of writing. The lag I have restrain me from uploading anything to anyone, and permits very low downloading. I had to save this text somewhere until it finally worked posting.
    Edit: I tried adding Menu items in the Core Services folder, manually. Nothing happenned.
    Edit: iTunes awfully long to load too. I dare checking any other apps.

    First step to a cleaner system:
    Make way!
    OS X needs at least 15% of your startup disk to work proprely.
    A lot of experts even in these forum has confirmed this, and this should be a general rule with no exception.
    As my startup has 500GB, I'd need to have at least 75GB more or less (more more than less) space free.
    Using GrandPerspective , I was able to find out who were the culprits using huge disk space, often without good reason. These including gigantic duplicate backup of older system (old win/unix laptop lying around), copy of DVDs (WHOLE copy, god, oh god why?) which were blottering up all the space.
    Other utility of the same genre as GrandPerspective available are: Disk Inventory X (slower than GrandPerspective in my opinion) and TreeSizeMacOSX (a lil awkward to use, not so nice GUI).
    These are program that will show off a graphical display of file depending on their size. Huge one are big nice easy to spot blocks, while smaller files are simply smaller square (as for GrandPerspective and Disk Inventory X). I suggest you try out both.
    Once you've found the culprit, decide what would be his fate.
    As for my DVDs, I am encoding them (high tech quality and encoding, yo!) using Handbrake. If you don't know about Handbrake and need to have some DVDs converted, I highly suggest you try it out at once.
    +Remember to only use DVD encoding and copying for your own and personnal use.+
    Results?
    I have compressed a 70GB disk image to a 45GB using Disk Utility and changing the image type. Oh but since I already had the compressed one, I just made 70GB. Then I am saving at the moment 7,2GB of each DVD, as my final size is 900MB over a 8GB film.
    As for my pictures, which are consuming 100GB of my disks, I am currently building (or trying to) an automator action to resize and compress all the picture I feel less confident about keeping, but that I can't get rid off (I'm sure a lot of people gets the same feeling towards picture). This will help reduce by a lot the number of high quality picture really available, as I don't really need a super RAW quality for each shots.
    One last note: I recommend always have a spare workable drive, perhaps even with a partition with a system on it. In that case, if you ever need to move huge amount of data, or even your whole system, but your system won't move because of lack of space, a spare disk can come in handy in these moments.
    That's pretty much it for disk space cleaning!

  • External monitor simply not working - including with external dock (dual screen)

    I can't get the external monitor (aka dual screen) to work on my T60 via the VGA port. My model is currently running Windows XP and has a ATI Radeon X1300 video card.
    I'm 6 months out of warantee (although this problem started while in warantee but I can't convince Lenovo of that).
    I've tried the following:
    - ensuring "extend my monitor onto this desktop" in windows display properties
    - disabling/enabling Presentation Director and trying all the schemes
    - setting all different combinations of modes for resolution/colour on both (LCD + VGA) monitor
    - trying two different monitors and cables (which did work with other computers)
    - Updating the video drivers (from the Lenovo website) and Presentation Director to the latest versions
    I then figured it might be a hardware fault, so I tried to see if the external monitor was activated on bootup. I made sure the "LCD + VGA" option on boot was selected in BIOS. Still no joy.
    Finally, I figured the actual VGA connector was broken so I bought a compatible mini docking station (port replicator) and attached the VGA cable to that and even that didn't work.
    What on earth could be wrong if it's not the software and not the VGA connector? The video card is working as its powering the LCD display?
    Is my only option to give it in to repair (I can't afford that)?
    Michael
    Message Edited by mstrom on 07-03-2008 04:03 AM

    T23FUN wrote:
    Hi,
    Does the external connections and cables work with another system. I'd do that first.
    If all of it works with another system then it could be drivers or internal things but try that first.
    There are some driver updates on the Lenovo site. Make sure your BIOS are updated and such.
    Good Luck,
    Yup, checked the cables and monitor with another system (actually with the same laptop using a USB->VGA adaptor which isn't a long-term fix)
    Also updated to all the latest driver including a BIOS update (which I forgot to mention).
    thanks,
    Michael

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