7 OSI Layers

7. Application Layerserve as application interfaces with network functionality, manage how applications can access the network and then generate an error message.
TCP / IP application layer is the Application. Application Layer has 8 protocol, namely:DHCP (Dynamic host configuration protocol): for IP distribution with a limited number of IP numbersDNS (domain name server): Database engine domain name and IP numbersFTP (File Transfer Protocol): A protocol for file transferHTTP (Hyper Text Transfer Protocol): A protocol to transfer HTML files and WebMIME (Multipurpose Internet mail extensions): protocol for sending binary files in text formNNTP (network news transfer protocol): protocol for receiving and sending news groupPOP (Post Office Protocol): A protocol to retrieve mail from the serverSMB (Server messages block): protocol for the transfer of DOS and Windows file servers
6 Presentation Layerserves to translate the data to be in tranmisikan by the application into a format that can be ditranmiskan through the network.
TCP / IP alpikasi, is the presentation layer. Presentation Layer 4 protocol that have:SMTP (Simple mail transfer protocol): protocol for the exchange of mailSNMP (Simple Network Management Protocol): A protocol for network managementTelnet: A protocol for remote accessTFTP (Trivial FTP): A protocol for file transfer
5 Session Layerserves to define how connections can be made maintained or destroyed.
TCP / IP alpikasi, Layer is session. Session Layer 3 protocol has:NETBIOS (Network basic input output system): BIOS standard networkRPC (remote procedure call): remote procedure callsSOCKET: Input outpu for BSD-UNIX network types
4 Transport Layerserves to break down the data into ppaket-data packets and provide the serial number for the packages that can be rearranged to the destination as it arrives.
TCP / IP Transport, Transport Layer is. Transport Layer 2 protocol has:TCP (Transmission Control Protocol): A protocol-oriented data exchange (conection oriented)UDP (user datagram protocol): Protocol data exchange non-orientation (Connectionless)
3 Network Layerserves to identify the IP addresses making headers for the packets and then routing through the internet router and switc working USING layer-3.
TCP / IP Network Layer is the Internet. Network Layer 4 protocol has:IP (Internet Protocol): A protocol for routing settle itRIP (Routing Information Protocol): Protocol to select the routingARP (address resolution protocol): Protocol to get the information right from the hardware IP numbersRARP (Reserve ARP): protocol to obtain the IP address of the hardware
2 Data Link Layerfunction to determine how the data bits are organized into a format called a Frame
TCP / IP Data Link, Network Interface Layer is. Data Link Layer is divided into two, namely:Data Link LLC PPP (Point to Point Protocol): A protocol for point to pointData Link MAC SLIP (Serial line internet protocol): Protocol by using a serial connection
 1 Physical Layerserves to mendefinisakan network transmission media, signaling method, bit synchronization, network architecture, (such as ethernet or TokenRing), network topology and wiring.
TCP / IP Physical Layer with Data Link. Protocol for Physical Layer:Ethernet, FDDI, ISDN, ATM

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How to Install and Configure FTP Server

The installation steps is:

Insert your installation DVD. First we will mengsintall package vsftpd ftp server ie
# Apt-get install vsftpd

After that, you will receive a confirmation message. Just hit enter to continue.
And the installation process will take place shortly.
After the installation is complete. Then we go to the configuration stage.

First we go to the etc directory
# Cd / etc /

Then we will edit the vsftpd.conf file that is in that directory.
# Vim vstpd.conf

Find words that named
anonymous_enable = YES

Replace YES with NO.

After that look again
# local_enable = YES

Remove the fence in front of him.

After that look again
# write_enable = YES

Remove the fence in front of him.

After that look again
# anon_upload_enable = YES

Remove the fence in front of him.

Then save your edits lah.
And then restart vsftpd
# / Etc / init.d / vsftpd restart

Once you've finished configuring, then the next step is to add a subdomain ftp to your domain record. First make sure you have installed and configure DNS servers.

Login to bind directory
# Cd / etc/bind9

Db file and then edit your domain
# Vim db.ujian

After that add
ftp IN CNAME ns1

If you have added records for ns1. Or if you get confused just use

ftp IN A 192.168.0.1

replace 192.168.0.1 with your server IP.

Then save and restart your bind9.
# / Etc/init.d/bind9 restart

Then you can access your ftp server with the domain ftp.domainanda.com. To log in, use the user accounts that exist on your server. If not there you can add a user with the command

# Adduser USERNAME

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How to Configure Access Point TP-LINK

1. First setting our AP IP 26.12.95.3 as the default state of TP-Link Wireless has address 26.12.95.2
2. Open the browser, in this case I'm using Mozilla, then input the IP address (address) of Wireless was the 26.12.95.2 into the browser address bar and then press enter.
3. Enter the username: admin and password: admin
 then it will appear the interface of Wireless TP-Link. Choose the menu Network> LAN enter the address as above then Subnet Mask: 255.255.255.0

4. TP-Link Wireless restart by choosing System Tools> Reboot then wait a while and then go to the TP-Link Wireless systems such as the initial step.

5. Then select >> wireless LAN access point mode select

6. Upon entry into the administrator interface, select menu and choose basic wireless settings and enter the following settings:

7. The next step is its wireless security settings so that the person entitled to use the connection, select the Wireless menu> security settings:

8. Next step is Mac Setup. Click the menu on the display as below. For only allow Setting for Mac is registered to be entered click on allow and vice versa.

9. Change the admin passsword

10. Save and Reboot for the TP-Link Wireless and ready for use

     

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How to Configure Mikrotik RouterOS

Previously you should have installed a Mikrotik on your computer. after installation, please follow the following steps:

1.after installed properly execute your Mikrotik
2.enter default user password
username: admin
password: (blank) without a password
3. replace your ethernet name if you want, in which case you can give any name = [admin @ mikrotik]> interface
[admin @ mikrotik] interface> print (see first how many ethernet reply attached)
[admin @ mikrotik] interface> set 0 name = LAN
[admin @ mikrotik] interface> set 1 name = WAN
4. then added the ip addresses
[admin @ mikrotik]> ip address
[admin @ mikrotik] ip address> add address = 192.168.0.1/255.255.255.0 interface = LAN -> ip interface for local
[admin @ mikrotik] ip address> add address = 203.89.31.34/255.255.255.248 interface = WAN -> The global ip antecedent to get from ISP
5. then enter the gateway
[admin @ mikrotik]> ip route
[admin @ mikrotik] ip route> add gateway = 192.168.0.0/24/203.89.31.33 -> This is a gateway for exit
6. then setup a webproxy
[admin @ mikrotik]> ip web-proxy
[admin @ mikrotik] ip web-proxy> set enabled = yes
[admin @ mikrotik] ip web-proxy> set transparent-proxy = yes
[admin @ mikrotik] ip web-proxy> set max-object-size = 1200KiB
7. then add the rule so that the client will use port 80 on the web-proxy to shift gears
[admin @ mikrotik]> ip firewall nat
[admin @ mikrotik] ip firewall nat> add chain = dstnat protocol = tcp dst-port = 80 action = redirect to-ports = 3128
8. then input its dns
[admin @ mikrotik]> ip dns
[admin @ mikrotik] ip dns> set primary-dns = 203.130.208.18
[admin @ mikrotik] ip dns> set secondary-dns = 8.8.4.4
9. Now masqurade interface WAN
[admin @ mikrotik]> ip firewall nat
[admin @ mikrotik] ip firewall nat> add chain = srcnat action = masquerade src-address = 192.168.0.0/24 dst-address = 0.0.0.0 / 0

10. now try to ping the gateway and dns of proxy, if REPLY means is connect

      GOOD LUCK :)

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