Linux and UNIX Systems Configuration Help, How To, Tutorial and Basic Information

1. How To Securing SSH Connection

Tags: [how to, linux, unix, network, secure, SSH, connection]  ...

2. How to get Default Port Numbers

Tags: [network, port, number, linux, unix]  ...

3. How To Securing SSH Connection

... allowing specific IPs, the default policy must first be set to DENY to be effective. edit /etc/hosts.deny and add the following line: sshd: ALL Add to /etc/hosts.allow the network you want to allow. For ...

4. How to get Default Port Numbers

To View a port number type in terminal for full list: cat /etc/services for one you need: cat /etc/services | grep (port number or service) View /etc/services file.

5. Get Device Information

...  Sytem Configuration # system-config-network # system-config-display # system-config-packages # system-config-... Show Logical Volums # mcedit /etc/fstab Get Swap Size # cat /proc/swaps ...

6. Creating Transparent Proxy With squid and iptables

... 192.168.5.1:8888 cache_peer [your_proxy] parent 8080 0 no-query cache_dir ufs /var/spool/squid 5000 16 256 acl clients src [your clients' network, ex. 192.168.5.0/255.255.255.0] acl all src 0.0.0.0/0.0.0.0 ...

7. Network Information and Configuration Commands

Configure Network # netconfig Get Network Status # netstat # ifconfig Get Route Information # route Get Network Cards # lspci | grep -i ethernet Dump TCP Packages to View # tcpdump Dump TCP Packages Into ...

8. Default Port Numbers

Here are listed default port numbers (full /etc/services file) # /etc/services: # $Id: etcservices.txt,v 1.2 2005/12/18 13:54:31 francis Exp $ # # Network services, Internet style # # Note that ...

9. Linux, UNIX Directories

... network, etc.) /root Root's directory /sbin Basic system software /tmp Temporary files /usr Directory impracticable important files /var Various data (logs)  ...

10. 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 ...

11. Network

Network Information ...

12. Network

Network Tools ...

13. Tools

Network Tools ...