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| − | FOCUS: Basic Mail (Postfix) Setup
| + | #REDIRECT [[OPS335_Lab_5]] |
| − | This lab will show you how to set up a Postfix email server using a Fedora 13 installed PC.
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| − | You will need at least two systems to do this lab. The first could be Fedora on your removable hard drive while the second could be a virtual machine.
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| − | PART A - Prerequisites
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| − | Your hard drive should have Fedora 13, 64 bit Live edition already installed.
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| − | You should have at least one VM installed: also Fedora 13, 64 bit Live edition.
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| − | Both your host and guest should have default firewalls enabled.
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| − | Both your host and guest should have SELinux enabled.
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| − | Both host and guest should have all software updated. [ yum update ]
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| − | Ensure the clocks on both machines are set to the correct date and time.
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| − | PART B - Testing your network
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| − | Start Firefox on your host and authenticate yourself on Sene2net with your LEARN account.
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| − | Ensure you can surf the web on your host machine.
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| − | Start Firefox on your guest.
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| − | Ensure you can surf the web on your guest. NOTE: you should not have to authenticate yourself on the guest.
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| − | PART C - Testing email to the outside world using mailx and sendmail
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| − | Sendmail is installed and running by default on Fedora 13 so there is no need to install it.
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| − | Install mailx on both the host and the guest. [ yum install mailx ]
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| − | Test email from the host by sending an email to your LEARN account. [ mail -s "PART C3" xxxxxx@learn.senecac.on.ca ]
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| − | Note: xxxxxx is your LEARN ID.
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| − | Note: after you type in your letter, enter a period in the first column on the last line and hit the ENTER key.
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| − | Check your LEARN email to see if you got the email. If you did make a note of the return address.
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| − | Test email from the host by sending an email to your LEARN account. [ mail -s "PART C4" -r hacker@evil.com xxxxxx@learn.senecac.on.ca ]
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| − | Note: xxxxxx is your LEARN ID.
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| − | Note: after you type in your letter, enter a period in the first column on the last line and hit the ENTER key.
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| − | Check your LEARN email to see if you got the email. If you did make a note of the return address.
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| − | Repeat steps 3 and 4 on the guest machine.
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| − | PART D - Install and configure Postfix
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| − | On both machines do the following:
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| − | Stop sendmail. [ service sendmail stop ]
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| − | Install Postfix - yum install postfix
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| − | Edit the Postfix configuration file, /etc/postfix/main.cf, and change the following lines:
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| − | mydomain = example.org
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| − | myorigin = $mydomain
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| − | inet_interfaces = all
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| − | mynetworks = 127.0.0.0/8, 192.168.122.0/24
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| − | relay_domains =
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| − | Start Postfix [ service postfix start ] on both host and guest machines
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| − | PART E - Testing email using IP Addresses
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| − | If you have problems with the following you may have to set SELinux to permissive mode and/or adjust your firewall to allow traffic to/from port 25.
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| − | Try sending an email from your guest to your host. [ mail -s "PART E2" yyyyyy@[192.168.122.1] ]
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| − | Note: yyyyyy is your host ID
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| − | Note: the square brackets around the host IP address
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| − | Try sending an email from your host to your guest. [ mail -s "PART E3" zzzzzz@[192.168.122.ZZZ] ]
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| − | Note: zzzzzz is your guest ID
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| − | Note: ZZZ is your guest IP address
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| − | PART F - Set up a DNS server
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| − | Refer to Lab #3 and set up a DNS server on your host.
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| − | Set your host name to f13.
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| − | Set your guest name to vm01.
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| − | Set your domain name to example.org.
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| − | Test your DNS on both host and guest to ensure it works properly.
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| − | PART F - Test email using host names
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| − | Now try sending mail to yourself on both machines. For example, as joker on f13, use the command:
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| − | $ mail joker@f13
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| − | the machine will prompt for a subject: enter "testing" without the quotes.
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| − | Now enter the body of your letter. When you're done, enter a period (.) in column 1 on the last line of your letter. This will signal end-of-file and your letter will be mailed. You should end up back at the $ prompt. If you mess up use CTRL-C to cancel the email, DO NOT USE CTRL-Z.
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| − | Use the mailq command (you will need to be root) to view the mail queue.
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| − | Use the mail command to check if you have mail.
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| − | PART G - Test your configuration and view your logs
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| − | Restart your postfix servers on both machines.
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| − | Check your /var/log/messages file to see that your postfix servers started without error.
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| − | Send some emails from both guest and host to each other and to the outside world.
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| − | Check your /var/log/maillog file to see that your email messages were sent correctly.
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| − | PART H - Learning the mail command
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| − | Read the mail manual page and learn how it works.
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| − | PART I - Answer the following questions and and email them to your teacher in ASCII text format.
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| − | What is your full name and 9-digit Seneca student ID?
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| − | Include a copy of your main.cf file on vm01 (your guest) with this lab - but delete all commented and blank lines first - like this. [ cat /etc/postfix/main.cf | grep -v ^# | awk 'NF > 0 {print $0}'
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| − | What is the output of the iptables-save command on both your host and guest machines?
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| − | What firewall rule or rules, if any, did you have to enter on the guest and/or host so that email to/from each other would work?
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| − | What is the meaning of the square brackets surrounding the IP address in PART E?
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| − | What were your results to PART G? Show log segments to verify your answers.
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