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Old 12-30-2003, 08:31 AM   #1
mr_matti
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Why can't I talk to my ISP but can get anywhere else on the net..?


Here is my situtation. I am using Mandrake 9.2 and I am behind a dLink 704-P router. My linux box is a dual boot with Win 98. While in Linux, I can do anything on the internet except connect to my ISP's website, or my own website (hosted by the ISP) and I can't connect to the email server.

I can do anything I want in Windows without a problem. I have no idea why this is and am hoping for some ideas.

Also, with the email issue, I can send and receive email from my work's email server no problem.

The problem exists in all applications I have tried - Konqueror, Mozilla, KMail, Mozilla Mail, Evolution etc.

Does anyone have an idea?

Thanks, mr_matti
 
Old 12-30-2003, 08:43 AM   #2
mr_matti
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I probably should add some more info...
- I am using a cable modem
- I have been able to rid myself of this problem if I connect directly to the cable modem - no router - but obviously, this is not good since I have another PC that needs to access the internet
- I have also be able to (once) actually get everything working as it should but upon re-booting, the problem is back. This happened when I was playing with the harddrake configuation program...but I have not been able to get it to work since.

I hope this sheds a little more light...

mr_matti
 
Old 12-30-2003, 08:45 AM   #3
linuxgae
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What is your connection to your ISP ? Cable ? DSL? DSL pppoe ?
 
Old 12-30-2003, 08:57 AM   #4
mr_matti
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Cable...
 
Old 12-30-2003, 09:07 AM   #5
Gates1026
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Sounds like it is a config problem with your router if you can connect just fine without the router but you have problems when you are connecting through the router. This might be a silly question, but do you have a firewall of any sort enabled? What kinds of IP addresses (public or private) are you using behing your router? DHCP from your ISP?
 
Old 12-30-2003, 09:33 AM   #6
mr_matti
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I do not have any firewall enabled (iptables rules are all "allow")...and I can't find a setting the specifically says "firewall" on the router. The only thing that is enabled is "discard pings from WAN"

As far as the IP addresses go, I believe they are dhcp. Each of the addresses for the machines is a 192.168.xxx.xxx number. I don't really know what ISP addresses are.
 
Old 12-30-2003, 09:46 AM   #7
Gates1026
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I would check on your router to see what sort of subnet mask you have setup. Thats about the only thing that I can think of right at this moment. I would have to know more about what kinds of IP address you are dealing with (if they are public, please dont post them) but it would be helpful to know if your ISP has you on a private subnet (ex: 172.16.0.0) or something to that effect.
 
Old 12-30-2003, 10:06 AM   #8
mr_matti
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Subnet mask doesn't resemble the example you gave...and both the lan and wan are the same. (255.255.255.0) My router is set up to be a DHCP server.

I also just tried to telnet my ISP's IP address - and the connection was refused. I can however ping it...(I don't know what exactly that means....but I figured I would throw it in)..
 
Old 12-30-2003, 10:17 AM   #9
Gates1026
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I am by no means an expert but we should be able to get this worked through..........So your router is set up to be a DHCP server, this works out well. It should be giving out addresses something like 192.168.x.x right? or maybe 172.16.x.x (these are priveate addresses that can not be broadcasted on the internet) Is this correct? So your linux box should have a subnet that your router gives out. If you are not sure you can print out the output of your ifconfig command, as it will show your ipaddress and subnet mask as "Mask". The question I have is what kind of ip address is your router getting? If it is a private address also, you could have the wrong subnet somehow (do you have static or DHCP to the router?) This might not be the right problem, but its a good idea to get it all checked out anyway.

Can you check to see what IP address your router has? Dont print it out here in the post unless it starts with 172.16 or 192.168.
 
Old 12-30-2003, 10:25 AM   #10
mr_matti
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Yes...router is giving out the 192 numbers...so private behind the router. My linux ifconfig shows exactly what it should (192.... ip address and the mask of 255.255.255.0)

As for my router...it is getting a DHCP served IP address that is public(?) (not 192 or 172)

It is also showing a subnet mask of 255..255.255.0.

So what does this mean?..
 
Old 12-30-2003, 10:54 AM   #11
Gates1026
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Sorry, I fogot to add this to my previous post.......not being able to telnet to your ISP doesn't really mean anything, they probably just do not have a telnet server running (it is very insecure). The fact that you can ping them tells you the server is up and running.

Being that your router is given its IP address via DHCP means that your IP information is probably correct. try this and print the output please:

telnet <your ISP mail server> 110

This will see if you are able to connect to the POP3 port on your ISP's mail server
 
Old 12-30-2003, 11:02 AM   #12
mr_matti
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I can connect and the server tells me that it is ready.
 
Old 12-30-2003, 11:05 AM   #13
Gates1026
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so then if you use a program like evolution or kmail and point to this server as a POP3 server, does it give you your mail?
 
Old 12-30-2003, 11:10 AM   #14
mr_matti
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no...It wont give me my mail

Note:
From my ISP's point fo view...it appears as if I am connecting without problems...but my mail program (any one of them) just says "receiving mail message x of x" and that is where it hangs....
 
Old 12-30-2003, 11:14 AM   #15
Gates1026
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Is there a possibility of a wrong setting or something wrong with your email package? You might look over your settings again. You said that it connects just fine without the router, so I would reccomend that you check your settings on your router for anything that looks odd.

What happens when you try to open up your webpage fron your ISP?
 
  


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