Linux & Unix (Ubuntu,Debian,RedHat,Centos)

Principles of Network and System Administration,

What is network and systemadministration?,
Applying technology in an environment,
The human role in systems,
Ethical issues,
Is systemadministration a discipline?,
the challenges of systemadministration,
Common practice and good practice,
Bugs and emergent phenomena ,
Themeta principles of systemadministration ,
Knowledge is a jigsaw puzzle,
To the student ,
Some road-maps

combine string variables on bash. concatenate string bash

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Ftp ACL (Access Control Lists ) – restricted FTP access

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What is ACL ?

When you enable it , only selected ips  have access to  FTP server as a client.  it is for security of FTP. if some one stole  your FTP.

 

How to ?  It is depends on your FTP  provider. But if you have  own linux server.

access-list 101 permit tcp any any eq 21  
!--- The above line permits TCP traffic from any source, such as the FTP client,
      
!--- FTP server destination at the FTP control port 21. 

access-list 101 permit tcp any eq 20 any
!--- The above line permits TCP traffic from any source, such as the FTP server,
    
!--- FTP client at FTP data port 20.

 

Example Document :

HP_ACCESS_CONTROL_Ch3_ACL

 

Posted in FTP

Using tar command

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using tar command for     Partition backup

 

 

Grub Booting

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Finally, you can call up a specific menu interface with the configfile command as in:

Next, start GRUB, either with the grub executable you built in Linux or by rebooting with the GRUB floppy. If GRUB starts in menu mode, press c to go to command-line mode. Enter the following commands at the grub prompt:

 
..
 

How to Install Red5 0.9 on Ubuntu

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If they aren’t already installed, add the following to /etc/apt/sources.list

Then, install some required libraries

Now, download and install Red5

http://your-server-address:5080

secure ftp system IP and Protocol Diagram

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SFTP im TCP/IP‑Protokollstapel:
Anwendung SFTP
SSH
Transport TCP
Internet IP (IPv4, IPv6)
Netzzugang Ethernet Token
Bus		 Token
Ring		 FDDI

SFTP – SSH File Transfer Protocol – usually runs over TCP port 22

FTP – plain, old file transfer protocol – usually runns over TCP port 21 (+ opens separate ports for data transfer)

FTP/SSL – FTP over TSL/SSL channel.

FTPS – same as FTP/SSL

Secure FTP – either SFTP or FTPS

More info:

 

FTP

FTP classic

  • Plain FTP
  • Clear-text password sent over the network
  • Typically runs over TCP port 21
  • Defined by RFC 959 and 1123
  • Implemented in FTP/SSL component

FTP/SSL

FTP over TLS/SSL

  • Often called ‘FTPS’
  • Often called ‘Secure FTP’
  • Plain FTP over TLS/SSL channel
  • Password is encrypted
  • Transfer is encrypted
  • Typically runs over TCP port 21 or 990
  • Defined by RFC 959, 1123, 4217 and 2228
  • Implemented in FTP/SSL component

SFTP

SSH File Transfer Protocol

  • SSH File Transfer Protocol
  • Has nothing common with original FTP
  • Often called ‘Secure FTP’
  • Password is encrypted
  • Transfer is encrypted
  • Typically runs over TCP port 22
  • RFC not yet finished
  • Implemented in SFTP component