CHAPTER ONE - General Features

1.1) OVERVIEW

• 1.1.1) Domain Name Usage & Activation
• 1.1.2) Nexus Internet Services Contact Info

1.2) WHAT DO YOU OFFER?

• 1.2.1) Web Space
• 1.2.1.1) MS-DOS Terminal Access
• 1.2.1.2) UNIX Shell Access
• 1.2.1.3) MS Windows Access
• 1.2.1.4) The "Home" Page and HTML
• 1.2.2) FTP Space
• 1.2.3) Telnet Account
• 1.2.4) Cgi-bin Access
• 1.2.5) Real Audio(tm) & Real Video(tm) Servers
• 1.2.6) Capture Mail for Domain - Default Address
• 1.2.7) SMTP Mail Server

1.3) How Do I Use This Program??

1.3.1) Mail Related Items

• 1.3.1.1) Mail
• 1.3.1.2) Pine
• 1.3.1.3) Eudora (windows mail program)

1.3.2) Managing the Linux Account

• 1.3.2.1) Symbolik Links (redirecting file access)
• 1.3.2.2) passwd (changing your password)
• 1.3.2.3) zip/unzip
• 1.3.2.4) du (disk usage)

1.1) OVERVIEW

1.1.1) Domain Name Usage & Activation

Through our partnership with NAMES4EVER, we can offer you highlu discounted domain registrations, though you may use any registrar you prefer. Check the Domain Registrations page for more information.

Foreign extension domain names are also available (ie...cc, nu, de, il, us, nl), however you may need to assist us with the foreign language required to contact the registration NIC for that extension.

1.1.2) Company Contact Info

Please include the login name and/or domain name you are referring to when you write to support. We can't yet tell from your e-mail address, unless we happen to remember working with you before, and we may need to know in order to help. If appropriate, tell us exactly what file(s) you are referring to.

1.2) WHAT DO YOU OFFER?

Nexus Internet Services offers storage space for web pages with near global public access to those pages over the Internet. For security reasons, we have found it necessary to exclude certain segments of the south east asia-pacific area.

All hosting accounts come with mail server access, with user managed SpamAssassin filtering, mailing list managers, and FTP access. Depenging on the level of plan chosen, anonymous FTP services and SSL secure HTTP connections are possible. We also offer a limited form of program execution known as "cgi-bin".

Our computers are Celeron, Pentium IV, and higher class machines running customized version of Apache web server software over a customized release of the Red Hat Linux operating system. Apache responds to web page fetch requests from remote browsers while Linux is one of several variants of the Unix operating system.

1.2.1) Web space

Linux

Every customer gets his own password protected username. By logging in to his username, the customer gains access to his web storage space. Every username "owns" a structure of disk subdirectories in the file system, and is responsible for the content of the files within that structure. The "root" of this structure is the "home" directory, found at path "/home/username". Note that this is somewhat similar to the MS-DOS directory structure, except that there is no drive letter and forward slashes are used instead of backward slashes.

General

Inside the home directory is a subdirectory named "WWW". Every customer has his own separate "WWW" subdirectory. Files placed in "WWW" are visible to remote browsers over the Internet. As many clients are used to having their main directory refered to as "www", we have created another directory as such. When www is attempted to be accessed, the directory is automatically redirected to the correct WWW directory.

For example, when a browser asks for URL http://yourname.com/page.html, Apache looks for the file /home/username/WWW/page.html and sends it out. If you have not registered "yourdomain.com" with InterNIC and specified Nexus Internet Services as its domain server, then the remote browser must ask for the static IP number that you were supplied. Users on IP-less plans must have a domain name registered and associated with Nexus's domain name servers. Please be advised that static IPs may change from time to time, due to server re-arrangements that sometimes are necessary. Username/logins are always the first 8 digits of your domain name, or the the domain name itself if it is less than 8 digits.

Example:

Passwords are always 4-10 digits in length, and must pass stringent security auditing. Please ensure that your password does not include any 'dictionary terms', and always includes at least one numeric character. Passwords are tested using 'Kerberos' strength testing, and weak passwords will be rejected, and new passwords issued to you if your requested password fails to pass the strength test.

Now that we know where the files have to be located in order to be visible from the Internet, just how do we put the files there? There are several ways, depending on the local computer.

For the MacIntosh, a program called "Fetch" is used. Documentation on Fetch is not yet available. However, note that the binary mode referred to throughout the manual corresponds to the 'raw' mode in Fetch.

For Windows systems, communications programs such as ProComm emulate dumb terminals for connection to Linux. (See 1.2.1.1.) You will also want to use an FTP client to upload and download your files.

For UNIX systems, use rlogin to connect. (See 1.2.1.2)

1.2.1.1) MS-DOS Dumb Terminal Access

Set up your dumb terminal program under MS-DOS to connect to your local access provider. Log into your UNIX shell account and the use rlogin to get to your Nexus Internet Services userid.

Now follow the procedures under 1.2.1.2 immediately below.

1.2.1.2) UNIX Shell Access

After you have used rlogin to get to your Nexus Internet Services userid, you should be at the shell prompt in your home directory. Type cd www to enter your www directory. Then use rz to upload files into your www directory. Please don't upload web files into your home directory!

One way to update pages is to enter your account with the command:

The advantage of this over ftping is that you can then immediately run other shell commands after the files have been transfered. For example, you may wish to use lynx to test them or mail to send someone mail.

Note that the sequence rlogin -8 -l user nexus-iservices.com plus typing in your password SHOULD be done via a modem script. You really don't want to be typing this stuff on a daily basis. Name your script appropriately, so you are sure to recall it's name.

(Just be sure that the disk where your script is kept is physically guarded.)

1.2.1.3) MS Windows Access

This method is nearly intuitive and extremely difficult to do incorrectly. You need an FTP program, many of which are available at Download.com. We recommend CuteFTP or WS_ftp.

Then double-click on the FTP icon. This will bring up a "session profile" form. Under hostname, fill in your domain name (yourdomain.com, for example). Under username, fill in your username. Under password, put in your Nexus Internet Services password. Make sure the checkbox for "Anonymous Login" is CLEARED.

At the bottom of the form, under "initial directories", you may specify which directories you want to work with on your local system and on your Nexus Internet Services system. Under Linux, your "remote host" is /home/username/www, and your "local PC", specify the DOS path where your web files are located.

Hit the OK button. This will cause you to be connected to your Nexus Internet Services acount. The right side of the screen will show the files in your WWW directory while the left side will show your local PC files. To send a file from your local PC to your Nexus Internet Services WWW directory, click on the file you want to send and then click (or drag, as appropriate) on the right arrow button. To send a file the other way, click on the left arrow button.

You will see two option radio buttons under the right window labeled "ASCII" and "Binary". For all text files, including html files, and perl cgi programs, be sure to select "ASCII" so the end-of-line conventions are handled correctly. Graphic/image files and sound files should be transferred in binary mode 

1.2.1.4) The "home" page and HTML

The filename of your home page should be index.htm or index.html. The web server will automatically send the file at path /home/username/www/index.htm or /home/username/www/index.html when a browser specifies http://yourdomain.com.

To learn how to write HTML, we recommend "HTML For Dummies". Amazon.com is likely to have this ready to ship immediately, should you require it. Nexus Internet Services will provide billable consultative services for all web design and coding issues, if you require assistance.

1.2.2) FTP Space

All accounts, except non static IP accounts, come preset up with an ANONYMOUS ftp area where files can be uploaded or downloaded by anyone in the world without a password. This area is necessarily separate from web space and password protected ftp space for obvious reasons. If you want both upload and download anonymous ftp, you may want a read-only subdirectory for distributing files and a separate write-only subdirectory for receiving files. This is to prevent files that you are distributing from being destroyed accidentally, and to prevent files uploaded to you from being distributed to others before you examine them. The location of this directory is /home/username/anonftp/ for Linux hosts

1.2.3) Telnet Account

A telnet account is just another name for a Unix/Linux username. You need at least one to be able to upload/download your html files. When you sign up with Nexus Internet Services, you get a username and password. You may ask for more than one such username. Regular accounts include one, Additional setups are available for an additional charge.

Multiple telnet accounts are useful when more than one staff member will be working on the domain. You may wish to set it up so that different accounts have different security levels. For example, you could make it so only one telnet account could access your listserver data. For those of you wishing sophisticated access control, we will be happy to create additional groups for your domain. That may not make sense to those of you who are not Unix veterans, but it can allow you to have one account able to access only one directory while your others can access all directories, including that one.

Some of the programs available at the shell prompt are mail, a primitive email program, and pine, a much more powerful email program, ftp, to FTP onto other sites, telnet, to telnet onto other sites, and lynx, a text-only WWW browser, pico, an easy to use text editor.

Basic Telnet capability has been disabled on all servers due to security reasons. All accounts still have Secure Telnet capabilities. The advantages of Secured Telnet is that all traffic is encoded - including passwords. This prevents 'eavesdropping' on connections, and security breaches. One Secure Shell client (SSH client) known to work well with our servers is PUTTY, which is available here : http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html.

1.2.6) Cgi-bin Access

"CGI" stands for "Common Gateway Interface", a fancy name meaning computer programs running on the web server that can be invoked from a WWW page at the browser. The "bin" part alludes to the binary executables that result from compiled or assembled programs. It is a bit misleading because cgis can also be Unix shell scripts or interpreted languages like Perl.

A typical use for cgi is the processing of online forms. When the user fills in the boxes on the form and hits the SUBMIT button, the cgi program specified in the html will be run at the server, and the information in the boxes become available to the program as parameters. The program, being a program, can then do anything the programmer wanted it to do.

"cgiemail", for example, is a canned program written in C that gathers up the contents of the boxes on the form and emails them to a specified destination, then sends a WWW page confirming the action.

"imagemap" is another common use for cgi. Here, the X-Y coordinates of the pointer on an image are correlated with a specification table, so that clicking on different parts of the image will result in different links being followed.

Other cgis might ask for a password, check the password, then access a database for requested information. What it does is up to the programmer, but we do ask that the cgis are reasonable in their usage of CPU time and memory. While we do not require that they be submitted for approval first, out of control programs that hog the CPU and system resources will be hunted down and killed by our system monitors.

Standard pre-installed system cgis reside in your /cgi-bin/ subdirectory. Your presonal cgis also should be placed in this subdirectory. You will find this directory as a subdirectory of your WWW directory. If your domain is named company.com, you would then access your scripts as http://www.yourdomain.com/cgi-bin. You may need to set up the preinstalled scripts thru your browser control panel to see the correct HTML that is used for such. The browser control panel will walk you thru the simple processes.

See chapter four for more details on CGI.

1.2.10) Real Audio™ Server & Real Video™ Server

Each Real™ audio or video file you wish to transmit requires two files: a metafile with extension .ram, and the digital audio or video clip itself, with extension .ra. The .ram file holds one or more lines of ASCII text, each of which references the .ra file to be played when the .ram file is accessed by the browser.

Entries in .ram files have the form:

http://yourdomain.com/realaudio/filename.ra

Place your .ram and .ra files in the realaudio, subdirectory under your WWW directory.

.ram files must be uploaded in ASCII mode while .ra files must be uploaded in BINARY mode.

You may then access these files at http://www.yourdomain.com/realaudio/filename.ram

1.2.13) Capture Mail for Domain

Thru the browser control panel, you can configure your account to redirect all mail for your domain to arive at one email address. You may also configure all mail not specified otherwise to arrive at the "default" address. If no mail address is specified to capture all your non-specified mail, the mail will automatically default to your account username mailbox.

1.2.14) SMTP Mail Server

Auto-Responder Example

A auto-responder is set up thru the browser control panel with the email address of help@yourdomain.com and says:

We offer you help.

Mail to help@yourdomain.com will return the message "We offer you help".

These messages can be any size.

Alias/Forwarding Example

Set up thru the browser control panel mail from "fred@yourdomain.com" to be redirected to "somebody@somewhereelse.com", by simply clicking a button This would redirect mail for fred@yourdomain.com to somebody@somewhereelse.com, etc.

 Mail to a user that was not set up as a pop account, nor as a alias/forwarder, would be sent to the default user

1.3) How Do I Use This Program?

Note that with the exception of the description of using Eudora, the commands you are told to type in this section assume you have logged on to the Nexus Internet Services server with telnet or rlogin.

1.3.1) Mail Related Items

1.3.1.1) Mail

READING - Type mail to see if you have any mail. If you have any mail hit enter multiple times and all your messages will be displayed.

SENDING - type mail -s "juice" spamtrap@nexus-iservices.com<juice.msg to send the message juice.msg with the subject juice to spamtrap@nexus-iservices.com

Type:
    mail -s "juice" spamtrap@nexus-iservices.com
    juice is good
    .

to send the message juice is good with the subject juice to spamtrap@nexus-iservices.com

Type:
    mail spamtrap@nexus-iservices.com
    juice is good
    .

to send the message juice is good with no subject to spamtrap@nexus-iservices.com

1.3.1.2) pine

Type pine to enter a more advanced mail program.

Type L to select Folder List and then inbox to see what messages that you have received.

The rest of this program is quite easy to use. Why use mail instead? Mail has the advantage that it is easy to send files that you composed off line plus it is easy to read many files at once into a log file that you then read off line.

1.3.1.3) Eudora is a mail program that runs under MS Windows.

Eudora connects to the mail server over the Winsock. Mail may be composed and read offline, but if you're using early versions of Windows, make sure that Winsock is running before attempting to send or receive mail.

After Eudora has been installed, it must be configured to point to the mail server. To do this, start Eudora and select "Special" from the menu bar. Then select "Settings". Most of the options are self explanatory.

• Leave the entries for PH, and Finger blank.
• Fill in username@yourdomain.com for your POP account (username replaced with your username and yourdomain.com replaced with your domain name).
• Fill in SMTP server as mail.yourdomain.com, where yourdomain.com is replaced with your domain name. Note: Some ISPs will not let you use any other SMTP server other than their own, so you may have to use your ISPs mail server instead. Contact your ISP for information as to the location of their mail server.
• Under advanced network features, select 90 seconds for your network timeout.
• The option save password should be checked.
• The authentication style should be password option.
• Under connection method, do not check the offline option.

If you have multiple email addresses, you may have to install a separate copy of Eudora for each email address. Newer versions of Eudora allow for multiple personalities. You can enter each POP/Login email account as a separate personality and download mail from all or some of these accounts at the same time.

Eudora "Light" is freeware offered by Qualcom and can be downloaded over the net. Eudora "Pro" must be purchased. Search for Eudora under Yahoo for details on how to obtain a copy.

1.3.2) Managing a Linux Account

1.3.2.1) Symbolik Links (redirecting file access)

To link one file to another in the same directory, type

ln -s fred.htm index.htm

to redirect all file accesses from index.htm to the file fred.htm , while you are in that directory.

To link a file in your current directory to a file in another directory, type

ln -s /home/username/www/directory/joe.htm index.htm

to redirect all file accesses from index.htm to the file fred.htm in the other directory, while you are in the index.htm directory.

1.3.2.2) passwd (changing your password)

Type passwd to change your password. Or type passwd username to change that of one of your ftp users or pop accounts. You may also change your passwords thru the control panel.

1.3.2.3) zip/unzip

Type zip to zip files and unzip to unzip files. This program is compatible with the zip program for DOS. For example:

   $ zip myzip file1 file2 file3

This puts the files file1, file2, and file3 into a new zip archive called myzip.zip. On the other hand, if you had the archive myzip.zip and wanted to get back the files:

   $ unzip myzip

Typing zip or unzip by itself will give you a usage summary, showing nearly all the options availible.

1.3.2.4) du (disk usage)

The Unix command du -s directory shows how much disk space is used by a directory and everything below it. However, you may also check such on the front of your browser control panel for a pre-calculated figure.

If you have an anonymous FTP area, also check du -s /home/username/public_ftp to see how much space your anonymous FTP users are using.

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