Me and My Self

Installing GNS3 On Linux fedora

gozal — Fri, 30 Dec 2011 03:40:05 +0000

Below shows you how to install GNS3 onto Fedora 13. GNS is a Graphical Network Simulator allowing you to build virtual cisco networks

First we’ll have to install dependencies

[user@admin ~]$ su
Password: (Type in your root password here)
[root@admin /]# yum install python python-devel xorg-x11-proto-devel libXext-devel
[root@admin /]# yum install gcc-c++

Then installing Qt4 and GNS3

yum -y install PyQt4 wget telnet qemu xterm
cd ~
wget http://downloads.sourceforge.net/gns-3/GNS3-0.7.2-src.zip?download
unzip GNS3-0.7.2-src.zip && rm -f GNS3-0.7.2-src.zip
mv GNS3-0.7.2-src /opt/GNS3
cd /opt/GNS3
mkdir Dynamips
mkdir IOS
mkdir Project
mkdir Cache
mkdir tmp
chmod o+rw -R ./Project
chmod o+rw -R ./tmp
cd Dynamips
wget http://www.ipflow.utc.fr/dynamips/dynamips-0.2.8-RC2-x86.bin
chmod +x ./dynamips-0.2.8-RC2-x86.bin

Just running this command “/opt/GNS3/gns3” and now you can using GNS3 on your fedora. Or you can make icon on your desktop by right-clicking on desktop and select “create launcher” then name it GNS3 and in the command section type “/opt/GNS3/gns3”.

Happy fun for your GNS3

A weird problem

gozal — Thu, 11 Nov 2010 02:53:00 +0000

I’ve got a weird problem when troubleshooting dedicated internet connection in Parigi, east Indonesia. Physical layer connected already but there were no internet connection even all devices configured properly on PE Router, Catalyst Switch, DSLAM and modem.

How to solve this problem ? I’ve three (3) ways to overcome this crazy problem :

- First of all, I have to change the port on DSLAM and make some reconfiguration on it such as creating PVC, configuring vlan, etc. Test the system and go for internet connection

- Second, make some preparation for testing access performance. We are using SNR and attenuation value that displayed by modem and DSLAM and also using networking tester for testing access performance names TOOLGRADE.

- Third, checking the bad traffic on PE router that originate from customer. In this part, I see a virus that holding network performance. Just running IP cache flow on PE router and you will see it, e.g :

PE Router#sh ip ca fl | i 1/3.821
Gi1/3.821 x.x.x.x Null y.y.y.a 06 12BF 01BD 1
Gi1/3.821 x.x.x.x Null y.y.y.w 06 12BE 01BD 1
Gi1/3.821 x.x.x.x Null y.y.r.w 06 12B7 01BD 2
Gi1/3.821 x.x.x.x Null y.y.w.e 06 12B6 01BD 2
Gi1/3.821 x.x.x.x Null y.r.r.s 06 12BD 01BD 1
Gi1/3.821 x.x.x.x Null y.s.s.r 12BC 01BD 1

Note : x.x.x.x : source address, y.y.y.a : destination address, 01BD : indicated that virus found on customer networking

By doing this ways, hopefully it will solve the problem so customer can use their internet connection as usual.

ItzMe

gozal — Mon, 01 Nov 2010 04:22:33 +0000

Hi,, My name is Toufik Gozali and you can call me Gozal

I Graduated from ABFI Institute Perbanas. Started the first job as system engineer and responsible for some system migration in banking and telecommunication company such as Standard Charteer Bank, Danamon Bank, Indosat, etc.

Right now, I work at the biggest telecommunication and service provider company in Indonesia as broadband and network engineer. In this blog, I want to share my knowledge about system and network technology. If there are something wrong with my guidelines, please do not hesitate to inform me.

Thanks and may Allah bless us

Breaking out cascading DSLAM

gozal — Wed, 15 Oct 2008 12:31:16 +0000

In this part, I want to reconfigure DSLAM (Digital Subscriber Line Access Multiplexer) for trunk connection. Each DSLAM connected via cascading port, so I have to move the link to metro ethernet port.

I’m using Huewei as broadband devices for DSLAM and BRAS (Broadband Remorte Access Server). Lets begin for make some migration.

This commands are use for DSLAM trunking port that connected to metro ethernet devices

interface GigabitEthernet7/1/0
description “===UP LINK BRAS===”
switchport mode trunk
switchport trunk allowed vlan xxx
svlan-upport vlan yy
svlan-upport vlan zz

and this commands are use for downlink connection between BRAS and metro ethernet :

interface GigabitEthernet3/0/0
pppoe-server bind virtual-template 0
description LINK TO METRO
undo shutdown
negotiation auto
bas
access-type layer2-subscriber
#
interface GigabitEthernet3/0/0.1
pppoe-server bind virtual-template 0
undo shutdown
user-vlan xx
user-vlan yy
user-vlan aa bb
user-vlan cc dd
user-vlan ee
bas
access-type layer2-subscriber bas-interface-name bas_balaikota default-domain authentication broadband
client-option82
#
interface GigabitEthernet3/0/0.2
pppoe-server bind virtual-template 0
undo shutdown
user-vlan kkkk
bas
access-type layer2-subscriber default-domain authentication vlankkkk
authentication-method bind

I have to make a new physical connection from DSLAM to metro ethernet and configure it as a new uplink and downlink connection so that I can pull out the cascading connection port.

SSH Server di windows menggunakan Cygwin

gozal — Mon, 13 Oct 2008 04:31:58 +0000

Sehabis kembalinya dari Surabaya, saya di suruh membuat SSH Server untuk otomatisasi billing kolektor. Nah.. pas sampe di Makassar, komputer yang tersedia yaitu menggunakan sistem operasi Windows XP.

Langkah pertama saya yaitu langsung terjun untuk membuat SSH Server di sistem operasi window tersebut. Apa saja siy yang harus di prepare ? Sebenarnya mudah, tinggal install Cygwin aja SSH Server dah langsung bisa jadi. Eiitttsss…. tapi ada parameter2 yang harus di install pada Cygwin. Apa siy parameter2 itu ? openssh, tcp_wrappers, diffutils, zlib.

Setelah Cygwin di install, langkah selanjutnya yaitu konfigure windowsnya. Gimana yach caranya ?

Caranya gampang, klik kanan My Computer, Properties, Advanced, Environment Variables. Klik “New” dan masukkan System variables:
variable name is CYGWIN
variable value is ntsec tty

Pilih Path variable dan klik “Edit” :

Tambahkan ;c:\cygwin\bin di akhir baris.

Kalau sudah di setting windowsnya, kasih permition di cygwin :

chmod +r /etc/passwd
chmod +r /etc/group
chmod 777 /var

Jalankan script konfigurasinya : ssh-host-config -y dengan hasil konfigurasi yang diharapkan yaitu :

“privilege separation” => yes
“create a local user sshd on this machine” => yes
“install sshd as a service” => yes

Jalankan service SSH dengan cara : net start sshd atau cygrunsrv –start sshd

Jika gagal dalam menjalankan service tersebut, coba jalankan beberapa perintah berikut ini :

chown system /etc/ssh*
chown system /var/empty or chown sshd_server /var/empty
net start sshd

– Finish–

SAN

gozal — Wed, 17 Oct 2007 07:35:27 +0000

Setelah bergelut dengan berbagai cara alias baca manual book, akhirnya konfigurasi SAN berhasil dilakukan di salah satu badan pemerintahan negara.

Begini ceritanya. Setelah install 8 server IBM tibalah saatnya instalasi SAN yang menggunakan DS4700 ditambah dengan exp. SAN ini hanya dikonfigurasi untuk 4 server dengan sistem operasi UNIX dan sebuah tape library.

Saya menggunakan Brocade SAN Switch dimana semua portnya sudah di aktifkan. Port 0 hingga port 7 dihubungkan ke server untuk keperlulan storage dan port 8 hingga port 15 dihubungkhan ke server untuk keperluan tape library. Perlu diketahui untuk tape library ternyata ada yang belum dikonfigurasi yaitu persistant binding. Persistant binding digunakan agar tape ID tidak berubah.

Agar mempermudah remote instalation saya menggunakan RSA pada system management IBM.