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Home > Archive > Web Servers General Talk > April 2004 > Theory behind remote login
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Theory behind remote login
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| krishna_iiit 2004-04-11, 2:54 pm |
| Can any one explain how exactly a remote login program like telnet, rlogin or putty work?
I have an account in our college web server. So, we connect to that server using putty through ssh.
Now, my doubt is whether the yahoo is creating a new user in its server or is it simulating the mail server in a database.
If a user will be added to the server for every mail account created, then can I connect to yahoo using my putty program?
If yahoo is simulating the mail server in a database, then how can it implement all the features of the mail server.
Thanx in advance.
-Krishna. | |
| David Dorward 2004-04-12, 3:33 am |
| krishna_iiit wrote:
> Can any one explain how exactly a remote login program like telnet,
> rlogin or putty work?
Exactly the same way as a local login terminal works, except across a
network rather then locally.
> I have an account in our college web server. So, we connect to that
> server using putty through ssh.
>
> Now, my doubt is whether the yahoo is creating a new user in its server
> or is it simulating the mail server in a database.
Local system accounts are not required to run a mail server. Its quite
possible to have a mailbox for "john@domain.com" rather then just any old
"john"
> If a user will be added to the server for every mail account created,
> then can I connect to yahoo using my putty program?
You can not login to yahoo via SSH or telnet unless they run an SSH or
telnet server.
--
David Dorward <http://blog.dorward.me.uk/> <http://dorward.me.uk/>
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| krishna_iiit 2004-04-12, 12:04 pm |
| Thank you very much for your reply.
Actually, I can't understand the logic behind the client server technology. Previously I used to work in Novel Netware and used to do some programming. Then later I started using Windows NT. Now, we're given Linux accounts for individual mails. So, we are now connecting to the server using the remote login programs and my friends can mail me from any where as the server is a mail server over internet. Later I came to know that there will be three servers which a linux professional has to manage. They are Mail server, Web Server and Database server. So, then I thought that, because I have an account in the server, I can use these three servers if I have enough permissions.
Then how can the yahoo maintain the accounts of the users?
Are they actually giving the accounts for users in their servers or they are simulating the Mail server?
Whats the theory for a mail server and a Web based mail server?
Google claims that they plan to allocate 1GB space for each gmail account holder. How can Google provide that amount of space?
Is it true that a once a mail has been sent to many receipients, then only one copy like a web page will be residing in the mail server and then the copy will be sent to requesting user?
How can I know that a particular port of a server is open? Any commands or programs?
Even any link to the above doubts is highly appresiable.
Thanks in advance.
- Krishna. | |
| David Dorward 2004-04-12, 4:33 pm |
| krishna_iiit wrote:
> Later I came to know that there will be three servers which a linux
> professional has to manage. They are Mail server, Web Server and
> Database server.
There are a number of other types of server as well.
> So, then I thought that, because I have an account in
> the server, I can use these three servers if I have enough permissions.
> Then how can the yahoo maintain the accounts of the users?
> Are they actually giving the accounts for users in their servers or
> they are simulating the Mail server?
Given that a simulation is a pretend version of something, they certainly
are not doing this.
A piece of server software may use the same database as the system accounts
to authenticate users, but it could use a different authentication system.
It is very likely that Yahoo uses a authentication other then the system
accounts database.
> Google claims that they plan to allocate 1GB space for each gmail
> account holder. How can Google provide that amount of space?
By virtue that most users will not use anywhere near a full gigabyte of
space to store their mail.
> Is it true that a once a mail has been sent to many receipients, then
> only one copy like a web page will be residing in the mail server and
> then the copy will be sent to requesting user?
Email is not typically stored by any server other then the final
destination. There are exceptions, the most common of which is the sender's
server recording a copy of outgoing mail.
The end user will usually access mail over POP3 (in which users download
mail locally and usually delete it from the server, but might choose not to
perform such a deletion), or IMAP (in which case the mail is kept on the
server and a cache is kept locally). IMAP is typically used when users with
to access the same email from multiple computers.
> How can I know that a particular port of a server is open?
By trying to connect to that port with client software for the appropriate
protocol.
--
David Dorward <http://blog.dorward.me.uk/> <http://dorward.me.uk/>
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