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Re: Localhost problem!!

Don't you think it is responsibilty of a web server like apache to handle
all alias for a machine by adding a virtual domain name for that machine in
httpd.conf and then wrtting to your /etc/hosts.
And yes you can access your port 901 by typing http://localhost:901 if there
is any service running on that port that is listening to requests. You can
make your own program, and make them reside on port 901 to listen to
requests from outside world.


----- Original Message -----
From: vavi <vava@xxxxxxxxxxxxxxx>
To: <linux-delhi@xxxxxxxxxxxxxxxxxxxxx>
Sent: Wednesday, May 30, 2001 8:40 PM
Subject: Re: [linux-delhi] Localhost problem!!

> ok, even i am learning, so let me go this way....
> 1. before even the card is "up" during a boot, configuration regarding its
> ip, irq, etc. are already stored (taking the normal bootup scenario).
> 2. The card is then activated(with the irq etc. stored already), and also
> "enabled" which means that your NIC card is now.. or whatever
> address it is configured for. note that these are two different things.
> is the reason that while working, you can have a card configured, but
> "down".
> 3. now, you can give any alias or name to this ip address of yours.
> 4. rightly as you said, you can give more than one alias(eg. "ABC")
> me onthis one...) , and all will direct to the same NIC card. for the
> moment, a reference on this machine , mind you from "this" machine would
> lead you to this NIC card of yours...
> 5. other machines still cant refer to your NIC card yet, unless they too
> have an "ABC", in their /etc/hosts. (or ofcourse if the DNS is working,
> has "ABC" configured....)
> 6. Now, all that was NIC card. not the localhost issue "yet".
> 7. is the address that you refer for your """"OWN"""" machine.
> can give any name to it. but the only thing is that only your machine
> get this interface of your machine. ***so to answer your question, an ip
> address or hostname, gives only "ONE" interface of your machine, NOT your
> machine as a whole....***
> 8. from some other machine, if you need to access "this" machine's port
> or any other.. you need to essentially call the NIC interface, NOT your
> localhost alias. or else it would start pointing to its own machine
> moral: dont tamper localhost setup. just keep it simple and straight
> localhost localhost.localdomain
> moral 2: machine 1 accesses machine 2 using the NIC interface, and NOT the
> localhost interface....
> so machine 1 cannot use http://localhost:901 to access machine 2's 901
> no matter what the configuration be (ofcourse barring a few extremely odd
> cases...!! )
> all the best.
> coz i know, lectures sometimes are quire boring..
> and please guys, again, please correct wherever i was wrong...
> vavi
> ----- Original Message -----
> Hi everyone!!
> i tried all three but it still doent work!!
> there's one point i wish to be clear upon.
> when the system boots up the Ethernet card (or the NIC) detects the IP
> address assigned to it BEFORE it knows whatever hostname is assigned to
> it. am i correct??
> what i am trying to understand is that /etc/hosts
> a) provides the machine with the corresponding IP addresses of various
> hosts which may be refernced from time to time
> OR
> b) provides the hostname for a given IP address
> OR
> c) Both a & b
> this is getting a bit confusing for me now.
> If I change the hostname from localhost.localdomain (which has an alias
> localhost) to say "ABC" while retaining the alias as "localhost" would i
> still be able to reference the machine as localhost or would i need to
> look for "ABC" on my N/W. This is important to me as when i try to
> access the swat or http/https service running on my machine from some
> other machine say "M" i cant say http://localhost:80 or
> http://localhost:901 or https://localhost:443. For all i know or rather
> dont know, that machine M might itself be running a web server (or even
> the same web server) and then which one gets accessed??
> I am sorry if i am confusing anyone but i really need a hand with this
> jumbled up problem.
> Thanx to evryone in advance (especially vava and yashpal)
> Regds,
> Puneet
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