opening ports & i feel dumb
From: amg (ph33rful_at_optonline.net)
Date: Fri, 22 Aug 2003 21:37:18 -0400 To: email@example.com
recently switched to debian after years with windows, i am enjoying the experience, although at times i get frustrated - i know that is my fault and not my computer (or operating system - or linux - or debian - or yours)
my current dilemma is with ports:
understanding them, and working with them
i use a program called edonkey - which requires port(s) 4662, 4665, and 4661 (i don't think that last two are important as the first) to be open and available
using nmap i see that several ports are already open accepting connections - and these ports have certain programs or services assigned to them
(i don;t think that supplying the open ports is important - but i could be wrong)
while looking at "/etc/inet.dconf" and "/etc/services" i see that these programs and/or services have to be "declared" or "assigned" to a certain port number (or actually vice versa)
(side question: is my understanding of this false?)
i tried to input "edonkey" along with the corresponding port number inside the two aformentioned configurations files
i entered this into "/etc/inetd.conf":
edonkey stream tcp nowait amg /usr/local/bin/edonkey/donkey0.50.1
(please use your imagination for the other two ports)
and this into "/etc/services":
edonkey 4662/tcp edonkey # edonkey
(again, your imagination is required)
i then rebooted (just to make sure it was read correctly (special reminder: i am new at this))
and the corresponding ports were not opened - or available (using nmap)
doing research on the web (mainly google - along with lists.debian.org - and some tldp.org) i come across information pertaining to iptables and ipchains, and other firewall information.
i dont have ipchains or iptables installed, so assigning them access would accomplish nothing (correct?)
so, my question (along with the inter-dispersed) and my assumption is i don't have a firewall running on my computer (from what i can tell - very bad - but please limit your response to what's coming up next), certain ports are in a closed state, although my declarations in the two configuration files seem(to me) to be correct.
do i need to start edonkey as a service to allow it access to listen to a port (using it in a certain runlevel and/or a symbolic link inside that specific runlevel)?
(and if so how would i do this)
is there another configuration file i should be editing?
does debian come with a firewall as default? from what i can tell it doesn't - and i don't remember selecting one from the initial install - and certainly don't remember downloading one using "apt-get"
if it doesn't how do i allow my computer to listen to a certain port - and allow access to this specific port(s).
-- if the above question (it might not seem like one) is too much of a pain to read (not knowing what i am doing doesn't help me ask a question in the best manner) i'm assuming it can be summed up with this: how do i allow my computer to "open a port" (listen on a port) if you're answer is "some command pertaining to this firewall" - i don't have one installed also - if you're response is to "read the ****ing manual" - specify which one (i have read inetd - but couldn't figure out another one that would apply) i hope i've explained my question properly - i tried to give all the supplying and relative information - but if there is something i have missed - i will supply it along with any information that you could provide me with, i would also like to recieve tips on asking questions - this way - when i come back (which i'm sure i'll do) i'll be able to ask in the most concise and compact manner possible, allowing those that would help me a better chance of understanding me, and allowing me a better way of presenting my problem my pc specs: (in case you need to know) distro: debian 3.0 kernel: 2.4.18-bf2.4 (anything else?) -- To UNSUBSCRIBE, email to firstname.lastname@example.org with a subject of "unsubscribe". Trouble? Contact email@example.com