Linux, programming and more
The standard ftp command/client does not support IPv6 resolution.
A very powerful IPv6 ftp client alternative is lftp.
1 2 3 | id@acer:~$ lftp ipv6.idrobot.net lftp ipv6.idrobot.net:~> dir -rw-r--r-- 1 ftp ftp 0 Aug 26 17:28 test.txt |
And of course Firefox does FTP over IPv6:
ftp://ipv6.idrobot.net OR ftp://[2a01:4f8:131:51e2::10]
In this how to I describe the basically configuration and administration of Postfix on Debian Lenny.
Current I’m using Postfix version 2.5.5
This tutorial should working with older and newer versions.
1 2 | postconf -d | grep "mail_version =" | cut -d" " -f 3 2.5.5 |
You can find the postfix main configuration file under “/etc/postfix”
Let see what wee need to configure a working Internet Mail-Server
1 | postfix ~ # vim /etc/postfix/main.cf |
My example configuration:
1 2 3 4 5 6 7 8 9 10 11 12 13 | myhostname = ipv6.postfix.idrobot.net alias_maps = hash:/etc/aliases alias_database = hash:/etc/aliases mydestination = ipv6.postfix.idrobot.net, localhost.localdomain, localhost mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 smtp_bind_address6 = 2a01:4f8:101:265::37 mailbox_command = mailbox_size_limit = 0 recipient_delimiter = + inet_interfaces = all inet_protocols = all home_mailbox = Maildir/ bounce_template_file = /etc/postfix/bounce.cf |
If you want to relay your mails to another mail-server you can use the relayhost option:
Edit main.cf, and add this line:
1 | relayhost = ipv6.mx.idrobot.net |
Some administration commands:
Show running config:
1 | postconf -n |
Show the default postfix config instead of running one:
1 | postconf -d |
Show message content:
1 | postcat -q 7FB942082 |
Delete all mail in queue:
1 | postsuper -d ALL |
Schedule immediate delivery:
1 | postqueue -i 7FB942082 |
Flush the queue:
1 | postqueue -f |
1. Launch the X-Terminal application
2. Type in the command: “sudo gainroot”
3. Type in “apt-get install kernel-power-flasher” to launch the request to install the IPv6-enabled kernel available at Extras-Testing repository
4. Accept ll confirmations
5. After finishing the download, the new kernel will be flashed automatically to your N900 device. Now turn of the device and then turn on the device to reboot.
Now you are able to use ipv6 module
To add very simple ipv6 address install “IPROUTE” to use “ip” command.
1 | ip -6 a a 2001:470:1f0b:1514::100/64 dev wlan0 |
OSI is the Open System Interconnection reference model for communications. The OSI model is mainly used as a point of reference for discussing other protocol specifications such as TCP/IP and Net Ware.
The OSI reference model consists of seven layers that each defines a set of typical networking functions. The upper layers (application, presentation, and session; or Layers 7, 6, and 5) define functions focused on the application. The lower four layers (transport, network, data link, and physical; or Layers 4, 3, 2, and 1) define functions focused on end-to-end delivery of the data. Layer 2 is where switching is based, while Layer 3 is where routing is based.
Here are example protocols for eachlayer:
All following comparison operators have the standard mathematical interpretation and return a boolean value of True for true, False for false:
Comparison operations are supported by all objects!
This table summarizes the comparison operations:
| Operation | Meaning |
|---|---|
| < | strictly less than |
| <= | less than or equal |
| > | strictly greater than |
| >= | greater than or equal |
| == | equal |
| != | not equal* |
| is | object identity |
| is not | negated object identity |
* != can also be written <>, but this is an obsolete usage kept for backwards compatibility only. New code should always use !=.