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Rabu, 01 Juli 2009

VPN Site to Site Menggunakan VTUN

Pengantar

VTUN (Virtual Tunnel) adalah sebuah VPN (Virtual Private Network) yang sederhana, menggunakan tun device (FreeBSD, OpenBSD, NetBSD) atau tun/tap (Linux, Solaris) untuk menyalin paket-paket stack TCP/IP dan program vtund berjalan di dalam user space. Secara arsitektur, VTUN serupa dengan SSH VPN.

VTUN adalah cara yang paling mudah untuk membuat Virtual Tunnels pada jaringan TCP/IP. Karena mendukung berbagai type tunneling dan menyediakan banyak fitur bermanfaat:

* Enkripsi
* Kompresi
* Traffic shaping

VTUN dengan mudah dan sangat configurable. dapat digunakan untuk berbagai tugas-tugas jaringan antara lain: VPN, Mobile IP, dan lain-lain.

Instalasi VTUN


Sebelum memulai, jgn lupa jadilah super user di machine kalian masing-masing

File-file yg di butuhkan dalam penginstalan vtun ini adalah sebagai berikut:

--------------------------------------------------------------------------------------------------
1. lzo-1.08.tar.gz
2. vtun-2.5.tar.gz
--------------------------------------------------------------------------------------------------

--------------------------------------------------------------------------------------------------
namira# cd /root
namira# mkdir dl
namira# wget tp://ftp.urc.ac.ru/pub/OS/FreeBSD/distfiles/lzo-1.08.tar.gz
namira# wget http://ftp.devil-linux.org/pub/devel/sources/1.0/vtun-2.5.tar.gz
namira# tar zxf lzo-1.08.tar.gz
namira# tar zxf vtun-2.5.tar.gz
namira# cd lzo-1.08
namira# ./configure
namira# make
namira# make check
namira# make test
namira# make install
namira# cd ../vtun-2.5
namira# ./configure -with-lzo-headers=/usr/local/include --with-lzo-lib=/usr/local/lib
namira# make
namira# make install
--------------------------------------------------------------------------------------------------

Ok, Anda telah berhasil menginstall vtun di machine anda. Langkah selanjutnya adalah pembuatan vtund.conf

--------------------------------------------------------------------------------------------------
1 sebagai vtun server
1 sebagai vtun client
--------------------------------------------------------------------------------------------------

--------------------------------------------------------------------------------------------------
namira# cd /usr/local/etc
namira# mv vtund.conf original.vtund.conf
namira# pico vtund.conf
##### VTUND CONFIG SERVER START HERE by Tubagus @ INDOFREEBSD.OR.ID #####
options {
port 5000; # port used to connect with customers
ifconfig /sbin/ifconfig; # path to the ifconfig
route /sbin/route; # path to the route
}

default {
compress lzo:9; # If that does not include support for lzo, it should take
the option value compress no;
speed 0; #speed limit does not exist
}

# Settings, certain blocks in options and default, applies to all
# Remaining blocks

indofreebsd { # # describe client branch
pass indofreebsd; # secret pass secret; # password compounds - the word
secret
type tun; # tun type tun; # type IP tunnel tun
proto udp; # UDP proto udp; # using UDP protocol
encr yes; # encr yes; # include encryption
keepalive yes; # keepalive yes; # maintain a connection

up {
ifconfig “%% 192.168.10.2 192.168.10.1 netmask 255.255.255.255 mtu 1450 up”;
route “add -net 192.168.20.0/24 192.168.10.1″;
};

down {
ifconfig “%% down”;
route “delete 192.168.20.0″;
};
}
##### VTUND CONFIG SERVER END HERE by Tubagus @ INDOFREEBSD.OR.ID #####
--------------------------------------------------------------------------------------------------


Itu salah satu contoh vtund.conf untuk menjadi sebuah vtun server. Sebelum running vtun server di server kalian, coba kalian
lihat dulu ip 192.168.10.1, jgn lupa di add di virtual interface anda. Untuk di server yang lain, yang tepatnya akan menjadi vtun client, cara instalansinya sama aja seperti di atas, namun hanya vtund.conf nya saja yg berbeda. ok here the config file.

--------------------------------------------------------------------------------------------------
<span style="font-weight:bold;">##### VTUND CONFIG CLIENT START HERE by Tubagus @ INDOFREEBSD.OR.ID #####
options {

port 5000; port 5000;
ifconfig /sbin/ifconfig;
route /sbin/route;
}

default {
compress lzo:9;
speed 0;
}

indofreebsd {
pass indofreebsd;
type tun;
proto udp;
encr yes;
keepalive yes;

up {
ifconfig “%% 192.168.10.3 192.168.10.2 netmask 255.255.255.255 mtu 1450 up”;
route “add -net 192.168.30.0/24 192.168.10.2″;
};

down {
ifconfig “%% down”;
route “delete 192.168.30.0″;
};
}

##### VTUND CONFIG CLIENT END HERE by Tubagus @ INDOFREEBSD.OR.ID #####
--------------------------------------------------------------------------------------------------

Ok, itu salah satu config vtun client, dan jgn lupa untuk add ip 192.168.10.1 di virtual interface anda.

Setelah semuanya selesai, lakukan perintah berikut di vtund server anda

--------------------------------------------------------------------------------------------------
namira# vtund -s

lalu di machine vtun client anda lakukan perintah berikut

namira# vtund -p indofreebsd IPVTUNSERVERANDA

Untuk mengecek apakah vtun tersebut sudah jalan lakukan perintah beriktut:

namira# netstat -tan | grep 5000

karena vtun ini berjalan pada port 5000, tapi bisa anda ganti semau kalian juga c, mau port ataupun ip nya, hasilnya akan seperti ini:

namira# netstat -tan | grep 5000
namira# netstat -tan | grep 5000
tcp4 0 0 121.101.Xxx.xxx.55000 202.xxx.xxx.xxx.3128 ESTABLISHED
udp4 0 0 121.101.xxx.xxx.54483 202.xxx.xxx.xxx.5000
namira#

Hal tersebut di check di pada machine vtun client, dan dari vtun server akan seperti berikut:

portal# netstat -tan | grep 5000
tcp4 0 0 *.5000 *.* LISTEN
udp4 0 0 202.xxx.xxx.xxx.5000 121.101.xxx.xxx.54483
portal#
--------------------------------------------------------------------------------------------------

Kemudian check di machine vtun client dan machine vtun server anda, apakah IP-nya sudah saling berhubungan

Contoh dari vtun server:

--------------------------------------------------------------------------------------------------
tun2: flags=8051 mtu 1450
inet6 fe80::21c:f0ff:fe5c:b2fb%tun2 prefixlen 64 scopeid 0xa
inet 192.168.10.2 –> 192.168.10.3 netmask 0xffffffff
Opened by PID 67526
--------------------------------------------------------------------------------------------------

dan ini contoh dari vtun client:

--------------------------------------------------------------------------------------------------
tun0: flags=8051 mtu 1450
inet 192.168.10.3 –> 192.168.10.2 netmask 0xffffffff
Opened by PID 73871
--------------------------------------------------------------------------------------------------

Selesailah bridge networking menggunakan vtun.


fuck to. IndoFreeBSD TEAM
fuck to #Indofreebsd DALnet

Referensi:

http://vtun.sourceforge.net/features.html

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