Linux Server and Workstation Configuration How To

1. IPv6 Configuration on Ubuntu Linux

... (the result of the command sudo cat /etc/tsp/tspc.conf | grep-v "#") auth_method=any client_v4=auto userid=xxxxxx <== copy USERNAME from email passwd=******** <== copy PASSWORD from email ...

2. Internet gateway on FreeBSD

... 2 # Allow incoming secure SSH, port number better change $cmd 320 allow tcp from any to $wanip 22 in via $eif setup limit src-addr 2 # Allow incoming mail SMTP, if there is a mail server $cmd ...

3. Cron Manual

... -u root /var/spool/cron/root Example of cron file # Cron example file /var/spool/cron/root # (Created for Boot1935) SHELL=/bin/bash MAILTO=root # 1-12 hours * 0,1,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23 ...

4. Send Mail Script

Mail content text is /tmp/message.txt # mail -s 'Server Status Report' george@example.com -c Jon@example.com < /tmp/message.txt Send Mail With Attachment # !/bin/bash # tar -zcf /tmp/backup.tar.gz ...

5. Default Port Numbers

...  telnet 23/tcp # 24 - private smtp 25/tcp mail # 26 - unassigned time 37/tcp timserver time 37/udp timserver rlp 39/udp resource # resource location nameserver 42/tcp name # IEN 116 ...

6. OSI Model

The Seven Layers of the OSI Model 7 Application Network Process to Application   Provides network services processes to application processes (such as electronic mail, file transfer,...) Provides ...