LinuxQuestions.org

LinuxQuestions.org (/questions/)
-   Linux - Networking (https://www.linuxquestions.org/questions/linux-networking-3/)
-   -   Outbound IP and Router IP are different (https://www.linuxquestions.org/questions/linux-networking-3/outbound-ip-and-router-ip-are-different-536688/)

lawadm1 03-11-2007 09:45 PM

Outbound IP and Router IP are different
 
I recently moved to an apartment complex that included free high speed internet. I previously had a webpage, mail server, and ftp server that I could access from anywhere. Now that I'm here, I cannot get to any of the services anymore.

I noticed that my IP address is different than what the router thinks the IP address is. When I enter the outbound IP address in the browser it comes up with a Networking Management Company Page. Does this mean that they are blocking ALL incoming Ports?

Any ideas of what I can do?

acid_kewpie 03-12-2007 04:43 AM

well it sounds more like they aren't forwarding ports. if they have a decent firewall / router in the building as opposed to a noddy home adsl router then it's very common to seperate the ip of the internet facing device to that of the traffic it's permitting for a number of good reasons. you should approach them and ask them about port forwarding for external services...

archtoad6 03-12-2007 10:01 AM

As usual, Chris is probably right.

But if you feel like humoring me, I'm curious:
  1. What is your outbound IP?
  2. How did you determine it?
  3. What does the router think it is?
  4. Did they explain any of this to you before you moved in?
  5. How stable is your IP?
  6. Have you scanned your ports from outside?
  7. Where were the webpage, mail server, and ftp server? At home?
Feel free to answer by #, & not re-quote my Q's.

acid_kewpie 03-12-2007 12:23 PM

Quote:

Originally Posted by archtoad6
As usual, Chris is probably right.

*cough* i think you're confusing me with someone else...!

lawadm1 03-12-2007 01:51 PM

1. 74.135.XX.XXX
2. I determined the outbound IP by going to a "What is my IP Address" page.
3. The router thinks the IP Address is 10.2.XX.XXX
4. The apartment complex did not explain this. I typed in the outbound IP address in the browser to find it brings up the page of a managed network company.
5. The outbound and router IP appear to have been the same for the last month.
6. Not sure how to scan the ports from outside.
7. My webpage, mail server, and ftp server are still at the house with the ex since I cannot use it at the apartment.

archtoad6 03-12-2007 02:24 PM

  1. A real world IP.

  2. Like, but not necessarily actually, grc.com's Shields Up! page.

  3. The "10. ..." address is part of the so-called "Class A" private address space reserved for use on LAN's & WAN's. Looks like they may have the "real" router Chris mentioned.

  4. The lack of explanation may let you successfully ask a static outside address, but that tactic may or may not work.
    Code:

    $ whois 74.135.0.0
      . . . 
    NetRange:  74.128.0.0 - 74.143.255.255
    CIDR:      74.128.0.0/12

    certainly indicates that they MAY have plenty of IP's to use to accommodate you. We can always hope.

  5. Even if your LAN (10. ...) IP were static, I don't think that would help w/ allowing access from the 'Net -- their NAT'ing would get in the way. Even if they would/could give you port forwarding, one of its problems in this situation is that they would probably have to give you odd-ball high ports which would hamper the usefulness or your server(s). (No one would be able to find it/them w/o knowing the "magic" port #'s.)

  6. No longer applicable -- see #5.

  7. If #4, static IP, fails, perhaps you can leave your server(s) there, but administer them remotely. I have no idea how good your relationship w/ the ex is, but if you are maintaining her computers & LAN, that might be a reasonable trade off.

UhhMaybe 04-07-2007 07:40 PM

At the "ex's" house, do YOU have a router there? If so, change the settings on that router with the browser in YOUR Distro on YOUR system where YOU have the IP set from the router that came with YOUR new free high speed internet. That way, the "ex's" router location will "see" YOUR new location. Then setup YOUR services on YOUR present end to include the additional location. The two hard parts are A) getting the New IP B) making sure YOU have access to the setup program in the "ex's" router. If the "ex's" behavior has changed the router settings on YOU, difficulties may require arbitration on YOUR behalf. Good luck.

fur 04-07-2007 11:30 PM

You most likely wont be able to use it at the apartment unless you,

1.) Get your own internet connection.

2.) Ask the apartment's network people if they can forward the ports of those services to your computer.

3.) See if they have an additional public IP they would let you assign to your router/server.


Other than that, seeing how you have a private IP address you will not be able to host any public services.

So, I would recommend staying on good terms with your ex for a while :)


All times are GMT -5. The time now is 04:05 AM.