Network Tools

Network Monitoring

2009-06-07T16:35:00.004+07:00

Free network monitor Do you know what's really traveling through your network? Are you having problems finding the sources of network slowdowns?

Network Probe is the ultimate network monitor and protocol analyzer to monitor network traffic, and will help you find the sources of any network slow-downs in a matter of seconds.

Collect and analyze data from multiple probes using the Network Probe Enterprise version for a total traffic overview of all your networks.

more information here

Internet ISP's

2009-06-04T20:44:00.000+07:00

By Mark Woodcock

Choosing an internet ISP is often a rash and impulsive decision, but you should put more research and time into this decision to achieve the best results. Internet ISP’s are the portal by which you get onto the internet to visit websites. There are many different ones to choose from. The main goal that you should have in choosing one is that it offers a steady and consistent connection without disruptions, as well as speed.

Internet ISP service prices vary from company to company. You should not solely base your decision on price though. There are many other things to take into consideration when choosing an internet ISP. Here are a few:

1. How many email addresses do they allow per account?
2. Do they offer personal web site service?
3. Can I connect from anywhere?
4. What is the amount of web storage that is available?
5. Do they offer SPAM block or virus protection? What is the cost?
6. What is their customer service like? Is their response quick and helpful, or slow and irritating?
7. What type of service do they offer? Dial-up, DSL, cable, satellite, etc.
8. What are their billing options? Do they allow you to pay monthly or by the year?
9. If you have children, do they have web blocking service?
10. If you are on dial-up, are there local access numbers?

As you can see there are many different things that you need to take into consideration when choosing an internet ISP. This list is not inclusive, there may be many more items that are important to you and your family.

When you find an internet ISP that you are interested in, research them via internet or by asking friends. Call their customer service number and ask questions to see how well they answer the questions and to give you a feel of their availability and response. A simple five to ten minute conversation can give you a pretty good idea of what their service would be like if you had a problem.

Narrow it down to two or three choices and then line up their features side by side to see which one is the right choice for you. You may find that they vary little or you may find that they vary widely. This will give you a clear picture of your choices to enable you to make the right choice for you and your family. This will give you an internet ISP that is sure to make every member of your family happy!

About the author:
Learn the essential information for picking the right Internet Service Provider at Netzero Internet

What is your favourite FTP Client?

2009-06-04T20:40:00.002+07:00

Here's some list ftp client :

FileZilla
SmartFTP
Your list :)

SNORT

2009-06-04T20:36:00.001+07:00

'Snort' is one of the software to detect intrusion in the system, able to analyze real-time traffic, 'and logging ip, port able to analyze and detect all kinds of' attack 'from outside, such as buffer overflows, stealth port scans, CGI attacks, SMB probes , OS fingerprinting. snort by default it has the 3 most important things are:

(1) packet sniffer, like tcpdump, iptraf etc.
(2) packet logger, which is useful for packet traffic etc.
(3) NIDS, intrusion detection on the network.

If you want an IDS package that’s pretty, graphical and idiot-proof, Snort isn’t for you. But if you want something that’s surprisingly powerful and costs nothing, and you don’t mind spending a few hours figuring out how to write rules and chant the right incantations on a Linux command line, go and download Snort now.

VPS Free Trial

2009-06-04T11:27:00.003+07:00

After some searching with Google, looking for some provider with VPS services that provide some of Free Trial. In the end i'm found www.vservercenter.com.

They provide a Free Trial for a month but you must pay $1 for it.
I Guess this still woth it!

Thanks to vsercenter.com

Internet Access

2009-06-04T09:16:00.003+07:00

There's many type Internet Connection, here's some list to classified:

For home user :

Dial Up Networking : with speed max 56 kbit/s
Broadband connection

For Business or Internet Service Provider:

E1 speed: 2048 Mbit/s
DS-1 speed: 1.544 Mbit/s
DS-3 speed: 44.736 Mbit/s
OC-3 speed: 155.52 Mbit/s
OC-12 speed: 622.08 Mbit/s
OC-48 speed: 2.488 Gbit/s
OC-192 speed: 9.953 Gbit/s
OC-768 speed: 39.813 Gbit/s
OC-1536 speed: 79.6 Gbit/s
OC-3072 speed:159.2 Gbit/s

Dedicated hosting service

2009-06-04T08:33:00.002+07:00

From Wikipedia, the free encyclopedia

A dedicated hosting service, dedicated server, or managed hosting service is a type of Internet hosting in which the client leases an entire server not shared with anyone. This is more flexible than shared hosting, as organizations have full control over the server(s), including choice of operating system, hardware, etc. Server administration can usually be provided by the hosting company as an add-on service. In some cases a dedicated server can offer less overhead and a larger return on investment. Dedicated servers are most often housed in data centers, similar to colocation facilities, providing redundant power sources and HVAC systems. In contrast to collocation, the server hardware is owned by the provider and in some cases they will provide support for your operating system or applications.

Leased Line

2009-06-03T14:37:00.003+07:00

From Wikipedia, the free encyclopedia

Jump to: navigation, search

A leased line is a symmetric telecommunications line connecting two locations. It is sometimes known as a 'Private Circuit' or 'Data Line' in the UK. Unlike traditional PSTN lines it does not have a telephone number, each side of the line being permanently connected to the other. Leased lines can be used for telephone, data or Internet services. Some are ringdown services, and some connect two PBXes.

In the U.K., leased lines are available at speeds from 64Kb/s increasing in 64Kb/s increments to 2Mb/s over a channelised E1 tail circuit. The NTE will terminate the circuit and provide the requested presentation most frequently X.21 however higher speed interfaces are available such as G.703 or 10baseT. Some ISPs however use the term more loosely, defining a leased line as “any dedicated bandwidth service delivered over a leased fibre connection”^[1]

In the U.S., low-speed leased lines (56 kbit/s and below) are usually provided using analog modems. Higher-speed leased lines are usually presented using FT1 (Fractional T1): a T1 bearer circuit with 1 to 24 56k or 64k timeslots. Customers must manage their own network termination equipment—Channel Service Unit and Data Service Unit (CSU/DSU).

In Hong Kong, leased lines are usually available at speeds of 64k, 128k, 256k, 512k, T1 (channelized or not) or E1 (less common). Whatever the speed, telcos usually provide the CSU/DSU and present to the customer on V.35 interface.

For many purposes, leased lines are gradually being replaced by DSL and metro Ethernet.

OpenDNS for safer and faster browsing

2009-06-03T09:39:00.003+07:00

There’s been a lot of buzz around the OpenDNS lately. OpenDNS is a DNS provider that offers free service, with safer and faster browsing experience. This is how it works.

1. You register an account in OpenDNS site.
2. Login to your account.
3. Change your DNS Setting pointing to OpenDNS Servers.

That’s it, you’re good to go. The only difference from your normal environment is that now you’re using the OpenDNS DNS Servers.

The Advantages of using OpenDNS Server

You’ll be protected from Phishing attacks because OpenDNS keeps the database of phishing sites, so it can identify and stop sites trying to phish (cheat or trick) you. It claims to be faster than your ISPs DNS with large cache but I didn’t notice any change in my browsing speed after the change, but this could definitely be an advantage if your ISPs DNS is slow. It can correct the typos for you. For example, if you type nirlog.cmo instead of nirlog.com, it’ll correct your mistake and point you to the right site. The latest feature called Shortcuts allows you to type something easy-to-remember into your address bar for those web sites you visit often. For example, I can just type short “gmail” to visit Gmail, instead of typing the full url “http://www.gmail.com/“. This, I think is a very handy feature. Network admins can configure the full office networks too.

You can map short names for your favorite web sites

The Down side of using OpenDNS Server

You need to be always logged in to the Open DNS web site to use the service. They make money from the advertisement. It works like this, when there’s a typo OpenDNS cannot fix, it’ll redirect you to a yahoo search result with advertisement. I think that’s ok, but in some cases they’ll redirect you to a site that’s nothing to do with the web site you intended to visit. For example if you type http://nirlog.cm then it’ll redirect you to http://agoga.com/. It’s clearly not the site I intended to visit, the best thing OpenDNS could have done is to redirect to nirlog.com since there’s no nirlog.cm or at least it could have redirected to an organic search in Yahoo, the search engine they’re using. ~~So, I think OpenDNS’s decision on what’s a typo, what’s wrong and right could be questionable.~~ Actually the redirection has nothing to do with OpenDNS, it’s due to registrar for Cameroon, who has created parked pages with Agoga for every unregistered .cm domain.

When I typed http://nirlog.cm it redirected me to http://agoga.com

I think OpenDNS has a clear advantage over your ISPs DNS, with it’s phishing protection and speed in some cases. The shortcut is a very handy feature too. So for my personal machine I’ll keep the OpenDNS setting.

Update: John Roberts from OpenDNS has cleared the point about .cm domain in his comment, apparently registrar for Cameroon has created parked pages with Agoga for every unregistered .cm domain. So, it has nothing to do with OpenDNS. And also if you’ve setup OpenDNS on your networks, then you don’t need to login to the web site.

source: Visit this

Monitor network traffic with ntop

2009-06-03T09:29:00.002+07:00

How do you monitor your network traffic? Of course using MRTG, you might say. Yes, that’s true, MRTG does an excellent job of monitoring traffic across networks and devices (router/switches). But when you see an abnormal traffic in MRTG, how do you find out what is generating that extra abnormal traffic? This is where ntop comes into play. Basically, MRTG shows you a bigger picture, whereas ntop lets you zoom into individual networks and hosts, and gives you enough information to pinpoint the hosts or devices generating extra/abnormal traffic.

ntop is a tool that shows network traffic usage. It is based on libpcap and when installed in a place where it can capture network traffic (hub or a mirrored port of a switch), it logs and reports information concerning IP and Fibre Channel traffic generated by each host in the network. ntop has a very rich and user-friendly web interface for reporting.

This is what ntop can do for you:

* Sort network traffic according to many protocols
* Show network traffic sorted according to various criteria
* Display traffic statistics
* Store on disk persistent traffic statistics in RRD format
* Identify the indentity (e.g. email address) of computer users
* Passively (i.e. withou sending probe packets) identify the host OS
* Show IP traffic distribution among the various protocols
* Analyse IP traffic and sort it according to the source/destination
* Display IP Traffic Subnet matrix (who’s talking to who?)
* Report IP protocol usage sorted by protocol type
* Act as a NetFlow/sFlow collector for flows generated by routers (e.g. Cisco and Juniper) or switches (e.g. Foundry Networks)
* Produce RMON-like network traffic statistics

Test Your Internet Speed

2009-06-03T09:05:00.003+07:00

Speedtest.net is a very interesting online tool that allows you to test your Internet Connection Speed, both download and upload. You can choose to test your Internet speed against servers located in different cities in US, Europe, Asia or Australia.

The result for download much better, but i have bad result with upload. Is anyone know this issue?

Tier 1 Network

2009-06-03T08:48:00.002+07:00

A Tier 1 Network is an IP network (typically but not necessarily an Internet Service Provider) which connects to the entire Internet solely via Settlement Free Interconnection, also known as settlement free peering.

Definition

Although there is no authority which has defined the "tiers" of Internet networks, the most common definition is:

A network that can reach every other network on the Internet without purchasing IP transit or paying settlements.^[1]

By this definition, a Tier 1 Network is a transit-free network. But not all transit-free networks are Tier 1 Networks. It is possible to become transit free by paying for peering or agreeing to settlements.

It is trivial^{[citation needed]} to objectively prove (or disprove) a network is transit free. The fourteen (14) networks listed below, and only those fourteen, are transit free (as of July 2008).^{[original research?]} The most widely quoted source is Renesys Corporation, but the base information to prove the claim is publicly accessible from many locations, such as the RIPE RIS database, the Oregon Route Views servers, the Packet Clearing House, and others.

It is impossible for an outside authority to confirm that a network is not paying settlements of any type because such business agreements are frequently not public information, or even covered under a Non-Disclosure Agreement. The information presented here is the best collective knowledge of the Internet peering community. There is little disagreement amongst the community itself, even though there is no quotable source for the information. (For clarity, here we will define the "peering community" as the set of peering coordinators for networks which are present at Internet Exchanges on at least two continents.)

It is commonly believed^{[by whom?]} that observing this definition strictly would result in every network being disqualified. For instance, many large telephone companies who are also Tier 1 Networks buy, sell, or swap fiber amongst themselves. Even if it were possible to list every transaction, it is not possible to know if some of those transactions were required for or in payment of a peering connection.

As a result, the term Tier 1 Network is used in the industry to mean a network with no overt settlements. An overt settlement would be a monetary charge for the amount, direction, or type of traffic sent between networks.

Common definitions of Tier 2 and Tier 3 networks:

Tier 2 - A network that peers with some networks, but still purchases IP transit or pays settlements to reach at least some portion of the Internet.
Tier 3 - A network that solely purchases transit from other networks to reach the Internet.

source : wiki

Router

2009-06-02T15:48:00.001+07:00

A router (pronounced /ˈraʊtər/ in the USA and Australia, /ˈruːtər/ in Canada, the UK, and Ireland, these last two making a pronounced distinction with the tool used to rout wood) is a networking device whose software and hardware are usually tailored to the tasks of routing and forwarding information. For example, on the Internet, information is directed to various paths by routers.

Routers connect two or more logical subnets, which do not necessarily map one-to-one to the physical interfaces of the router.^[1] The term "layer 3 switch" often is used interchangeably with router, but switch is a general term without a rigorous technical definition. In marketing usage, it is generally optimized for Ethernet LAN interfaces and may not have other physical interface types. In comparison, a network hub does not do any routing, instead every packet it receives on one network line gets forwarded to all the other network lines.

Routers operate in two different planes ^[2]:

Control plane, in which the router learns the outgoing interface that is most appropriate for forwarding specific packets to specific destinations,
Forwarding plane, which is responsible for the actual process of sending a packet received on a logical interface to an outbound logical interface.

source: wiki

What is your IP?

2009-06-02T14:39:00.003+07:00

To check your IP address from our ISP just visit this site below:

Virtual Private Network

2009-06-02T14:11:00.003+07:00

VPN is creating a virtual private network or tunnel over the public network "internet". Each VPN tunnel is totally anonymous on the public internet and it helps to keep your activities anonymous, private and secure. A VPN connection is an attractive option for people concerned about their security and privacy. It is not a web proxy, it is much more advanced.

Secure your online activity with a VPN Connection, especially if you are using public unsecured WiFi networks.
Using VPN services, you can now surf the web anonymously & prevent your ISP from keeping logs on your online activities!
Access Blocked websites ... Unblock blocked websites by bypassing proxies... & it works with Skype.

Metro Ethernet

2009-06-02T10:14:00.000+07:00

A Metro Ethernet is a computer network based on the Ethernet standard and which covers a metropolitan area. It is commonly used as a metropolitan access network to connect subscribers and businesses to a Wide Area Network, such as the Internet. Large businesses can also use Metro Ethernet to connect branch offices to their Intranet.

Ethernet has been a well known technology for decades. An Ethernet interface is much less expensive than a SONET/SDH or PDH interface of the same bandwidth. Ethernet also supports high bandwidths with fine granularity, which is not available with traditional SDH connections. Another distinct advantage of an Ethernet-based access network is that it can be easily connected to the customer network, due to the prevalent use of Ethernet in corporate and, more recently, residential networks. Therefore, bringing Ethernet in to the Metropolitan Area Network (MAN) introduces a lot of advantages to both the service provider and the customer (corporate and residential).

Metro Ethernet system

A typical service provider Metro Ethernet network is a collection of Layer 2 or/and Layer 3 switches or/and routers connected through optical fiber. The topology could be a ring, hub-and-spoke (star), or full or partial mesh. The network will also have a hierarchy: core, distribution (aggregation) and access. The core in most cases is an existing IP/MPLS backbone, but may migrate to newer forms of Ethernet Transport in the form of 10G or 100G speeds.

Ethernet on the MAN can be used as pure Ethernet, Ethernet over SDH, Ethernet over MPLS or Ethernet over DWDM. Pure Ethernet-based deployments are cheap but less reliable and scalable, and thus are usually limited to small scale or experimental deployments. SDH-based deployments are useful when there is an existing SDH infrastructure already in place, its main shortcoming being the loss of flexibility in bandwidth management due to the rigid hierarchy imposed by the SDH network. MPLS based deployments are costly but highly reliable and scalable, and are typically used by large service providers.

source : wiki

VMware

2009-06-02T08:23:00.004+07:00

VMware, Inc. (NYSE: VMW) is the marketshare leader in virtualization software.^[1] The company was founded in 1998 and is based in Palo Alto, California. The Company is majority owned by EMC Corporation (NYSE: EMC). The name "VMware" comes from the acronym "VM", meaning "virtual machine", combined with ware from the second part of "software".

VMware's desktop software runs on Microsoft Windows, Linux, and Mac OS X. VMware's enterprise software, VMware ESX Server, runs directly on server hardware without requiring an additional underlying operating system. This is known as being platform- or hardware-diagnostic.

source: wiki

Recently i was using VMWARE to emulate Operating System before planinng to using real computer.

here's below i'm using to install CentOS

Virtual Private Server (VPS)

2009-05-31T18:56:00.001+07:00

A virtual private server (VPS, also referred to as Virtual Dedicated Server or VDS) is a method of partitioning a physical server computer into multiple servers such that each has the appearance and capabilities of running on its own dedicated machine. Each virtual server can run its own full-fledged operating system, and each server can be independently rebooted.

The practice of partitioning a single server so that it appears as multiple servers has long been common practice in mainframe computers, but has seen a resurgence lately with the development of virtualization software and technologies for other architectures.

source: wiki

OpenVPN GUI for Windows

2009-05-31T12:14:00.003+07:00

OpenVPN is a full-featured SSL VPN solution which can accomodate a wide range of configurations, including remote access, site-to-site VPNs, WiFi security, and enterprise-scale remote access solutions with load balancing, failover, and fine-grained access-controls.

OpenVPN is normally run in a console window, which can be a little annoying to have lying on the taskbar all the time. OpenVPN GUI lets you run OpenVPN without this console window. Instead you get an icon in the notification area (the area on the right side of the taskbar) from which you can control OpenVPN to start/stop your VPN tunnels, view the log, change your password and other useful things.

OpenVPN GUI is an Open Source project and is licensed under the GPL.

Recently i'm using this OpenVPN GUI to connect my Intranet in US, with only $2 - 5$/month I'm able to connect to HeadQuarter Office from every country in the World!

Mikrotik

2009-05-31T10:00:00.005+07:00

MikroTik RouterOS is the operating system of MikroTik RouterBOARD hardware.
It can also be installed on a PC and will turn it into a router with all the necessary features - routing, firewall, bandwidth management, wireless access point, backhaul link, hotspot
gateway, VPN server and more.

RouterOS is a stand-alone operating system based on the Linux v2.6 kernel, and MikroTik is to provide all these features with a quick and simple
installation and an easy to use interface

One of my favorite tools in Mikrotik is Torch, a Real Time Traffic Monitor.

download here (password: network-tool5.blogspot.com)

GNS

2009-05-30T15:18:00.007+07:00

What is GNS3 ?

GNS3 is a graphical network simulator that allows simulation of complex networks.

GNS3 is an excellent complementary tool to real labs for Cisco network engineers, administrators and people wanting to pass certifications such as CCNA, CCNP, CCIP or CCIE.

It can also be used to experiment features of Cisco IOS or to check configurations that need to be deployed later on real routers.

This project is an open source, free program that may be used on multiple operating systems, including Windows, Linux, and MacOS X.

download GNS here
download IOS for switching here (password: network-tool5.blogspot.com)
download IOS here(password: network-tool5.blogspot.com)

Live Links : 0/0

Cheap Hosting

2009-05-30T09:23:00.015+07:00

Currently i'm seeking unlimited bandwidth and unlimited space and then i'm found this hosting provider.

1. Gator, with only $9.95/month total you can get unlimited space and bandwith.

Use my coupon code to get a $9.94 discount (makes the $9.95 plan only one cent for the first month).

download coupon code from here (password: network-tool5.blogspot.com)

2. Still on journey to find more cheap hosting.

Live Links : 0/0

Telnet/SSH Client

2009-05-29T18:49:00.005+07:00

There's a lot software you can use:

1. Putty (free license)

2. Secure CRT (My favorite one)

download here (password : network-tool5.blogspot.com)

Bandwidth Test

2009-05-29T14:30:00.005+07:00

TfGen allows you to generate traffic on the local area network(e.g. Ethernet).

If you'd like to evaluate network performance, you need to generate traffic on the network. Until now, in this case, function of packet generation in an expensive network analyzer was used. Now, you can generate traffic easily without network analyzer using TfGen.

From order you to test the bandwidth from Customer to ISP just use this tools.

* If you buy a 2 Mbps does not mean you really get the results of 2 Mbps. 2 Mbps means data traffic you will get 2 Mb.

Looking Glass (Command-line)

2009-05-28T19:06:00.002+07:00

List public route server.
Just telnet this host name from your command prompt or your application.

route-server.savvis.net
route-server.ip.tiscali.net
route-views.oregon-ix.net
route-server.nlayer.net (this my favorite one)

Autonomous System

2009-05-28T18:59:00.003+07:00

Within the Internet, an autonomous system (AS) is a collection of connected Internet Protocol (IP) routing prefixes under the control of one or more network operators that presents a common, clearly defined routing policy to the Internet. wiki

From here you can check AS Number as known as ASN.

Every provider must have unique public ASN.

Looking Glass (Web based)

2009-05-28T18:32:00.003+07:00

Try this looking-glass site to backtrace to your host. With this you can check downstream traffic from your ISP.

1. Level3
2. Global Crossing
3. Centralops
4. Telstra
5. Abovenet
6. LG Telia

It's very useful if you have problem to Internet. Many ISP Engineer using this for troubleshooting