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Old 08-06-2004, 08:39 AM   #1
Registered: Aug 2003
Location: Atlanta
Distribution: Debian, OS X
Posts: 711

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Can send files, but not receieve despite DMZ

Okay, I know next to nothing about networking, but what I do know is the router's NAT was preventing me from doing several things, like accessing certain fservs on IRC, using BitTorrent to its fullest, and sending things between me and my friends. I finally got my Dad to DMZ my computer, just for a little bit so I could see if the other things would work better (I know it isn't the safest way, but after I get this worked out, I'll probably just do port forwarding instead). But here's my problem, on AIM or IRC, I can send files to anyone, and I can direct connect with anyone, however, it seems no one is able to send me anything, and if someone initiates the direct connect with me, it fails. I have to intitiate it. I'm assuming this isn't going to help my BitTorrenting, as more people aren't going to connect to me, I'll just connect to more people. GTK-Gnutella, however, stops complaining about me being firewalled. Another thing I thought was weird was I am unable to ping my friend, yet he can ping me. According to how things are working (I can send yet not receive) shouldn't it be neither of us can do it (since I have to eventually send the packets back) as apposed to just working one way? I figured the DMZ would solve the problems, but it apparently hasn't, any ideas?
Old 08-06-2004, 10:52 AM   #2
Registered: Oct 2003
Distribution: Slackware
Posts: 388

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The term DMZ has been perverted by the manufacturer's of NAT routers.

It used to mean a machine with an internet reachable address that behind a firewall that allows
some incomgin connections through and is outside a firewall protecting other machines on
the same network.

Presumably your machine still has a 192.168.x.x address?
It is still behind a NAT but incoming connections to all ports are forwarded to it.

Bittorrent is NAT-aware and will work fully in DMZ mode. it can work out what it's internet
ip address is even though the machine has a 192.168 address.

I don't know about IRC, AIM and direct connect.
Old 08-06-2004, 11:14 AM   #3
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Registered: Aug 2003
Location: Sydney, Australia
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Besides NAT, if you have iptables firewall running on your box it will also affect your connection.
Old 08-07-2004, 08:51 AM   #4
Registered: Aug 2003
Location: Atlanta
Distribution: Debian, OS X
Posts: 711

Original Poster
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I don't have anything set in an IPTables firewall, and you are correct, I still have my 192.168.x.x IP address, which I thought was odd, but for some reason, didn't include in my original post. Now, are all routers like this? Or is mine just particularly stupid? I have friends who are able to send/receive files from other people whom of which, are behind routers. And if all routers are indeed like this, is there anyway to get around it?


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