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Old 06-03-2004, 03:28 PM   #1
Registered: Oct 2003
Location: Madison
Distribution: mdk 8.2, 9.0, 9.2, slack 9.1
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Question newbie: dsl router blocked port 21 while linux doesn't know it?

Hi, newbie network relate question here---

short story version:

while nmap said my linux box has port 21 is open, i believe my dsl router is still blocked port 21 by itself, does linux has tool for me to open it? rotuer's port?

long story version:

I downloaded nmap (it allow me to scan all the open ports) and it said port 21 is open in linux, so i can use ftp sever. (which i've got that running for a while, although it has been very slow)

however!.... 2 days ago, i was on my hda (w/ winxp in it) and I noticed there's something interesting going on about my DSL router, I've been thinking if that has been affecting my Linux FTP Sever all alone (and that's why my ftp sever is so slow)

winxp claimed my port 21 is open also, but when i click on the "dsl connection icon" it said my DSL router is blocking my port 21. while i was confuse about the situation, i decided to setup a ftp sever and see if it works under xp. and it doesn't! even when xp is telling me my port 21 is open.

so what i did was i open the port 21 which is blocked by my DSL router through clicking the dsl connection icon. and ftp sever works!!!!

now that gets me to start thinking, my linux's ftp sever has been working all alone (but extremely slow compare to window) is that because my router blocked port 21, and linux had to re-route through 8080 (or other port for that matter?)

if so, does linux has any tool allow me to unlock port 21 for my router?

thank you for your patience reading my long story heheheh
Old 06-03-2004, 06:53 PM   #2
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You should be able to open or block ports with your router configuration. You didn't say what brand of DSL router you have. With mine, if I type the IP address of the router eg. into my browser, it will open up the router configuration. Most of the ones sold for home use are graphical, and not to difficult to navigate.

Post back th etype of router, I'm sure someone may know how to configure it.
Old 06-03-2004, 10:26 PM   #3
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use your routers config in the router, not linux
Old 06-05-2004, 12:15 PM   #4
Registered: Oct 2003
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Distribution: mdk 8.2, 9.0, 9.2, slack 9.1
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my router is : SpeedStream 5100, come with yahooSBC dsl. they come with some bullshit windoze cd, within the cd, there are tools for u to config the router......

since i don't have anything like that in linux, do I need to load windoze up and open all my ports and turn linux back on? :P


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