Friday, May 19, 2006

Hotkeys for Google

by: Dennis Nazarenko

Just select some text, press the corresponding key combination and the search results are in front of your eyes. This is what the new free program Hotkey Search Tool can do for you.

An advanced Internet user searches from 8 to 30 times a day. In the case of specialized search systems, such as on-line translators, dictionaries, and references, this value increases and totals from 10 to 60 requests a day.

Often, you had to start the browser and enter the search phrase to get the search results. But if the text is already typed, why should you have to type it again?

Suppose you want to search an encyclopedia for some unknown word or find the site of some product by its name. All you need to do is just select the text and send a command to Hotkey Search Tool. The program will copy the selected text to the clipboard and open the browser with the search results. If you do not select any text, the program will select the string typed before you pressed the hotkey.

A lot of users have already come to know Google Desktop. It is a convenient system for searching your local computer and it can work with additional plug-ins too. To perform a search in this system, you have to press windows+G or ctrl+alt+G and after that type the text you want to search for. As you have already guessed, with Hotkey Search Tool, you just select the text you need, press the above key combination and get search results right away.

It should be mentioned that the program is easily customizable and you can use it to search information in any on-line system that gets the text of requests in the URL.

The program does add one more icon to the system tray. So, we can only wish Google developers integrated the features of this program into their developments.

About The Author

Contact information:
[Responsible person] Dennis Nazarenko
[Phone] +380672204486
[Fax]
[Email] submit@ordinarysoft.com
[Web-site] http://www.ordinarysoft.com/

Sunday, May 14, 2006

Cisco CCNP / BSCI Exam Tutorial: Introduction To Policy Routing

by: Chris Bryant, CCIE #12933

Policy routing is a major topic on your BSCI exam, and you'll find quite a bit of policy routing going on in today's production networks. But what exactly is policy routing?

Policy-based routing, generally referred to as "policy routing", is the use of route maps to determine the path a packet will take to get to its final destination. As you progress through your CCNP studies and go on to the CCIE (or to a Cisco Quality Of Service certification), you'll find that traffic can be "marked" by policy routing in order to give different levels of service to various classes of traffic. (This is done by marking the traffic and placing the different classes of traffic in different queues in the router, allowing the administrator to give some traffic higher priority for transmission.)

There are some basic policy routing rules you should know:

Policy routing doesn't affect the destination of the packet, but does affect the path that is taken to get there.

Policy routing can forward traffic based on the source IP address or the destination IP address (with the use of an extended ACL).

Policy routing can be configured at the interface level, or globally.

Applying policy routing on an interface affects only packets arriving on that interface:

R2(config)#int s0

R2(config-if)#ip policy route-map CHANGE_NEXT_HOP

Applying the policy globally applies the route map to packets generated on the router, not on all packets received on all interfaces.

Whether you're running policy routing at the interface level, on packets created locally, or both, always run the command show ip policy to make sure you've got the right route maps on the proper interfaces.

R2#show ip policy

Interface Route map

local CHANGE_NEXT_HOP

Serial0 CHANGE_NEXT_HOP

And here's the big rule to remember....

If a packet doesn't match any of the specific criteria in a route map, or does match a line that has an explicit deny statement, the data is sent to the routing process and will be processed normally. If you don't want to route packets that do not meet any route map criteria, the set command must be used to send those packets to the null0 interface. This set command should be the final set command in the route map.

There are four possibilities for an incoming packet when route maps are in use. The following example illustrates all of them.

R2(config)#access-list 29 permit host 20.1.1.1

R2(config)#access-list 30 permit host 20.2.2.2

R2(config)#access-list 31 permit host 20.3.3.3

R2(config)#access-list 32 permit host 20.4.4.4

R2(config)#route-map EXAMPLE permit 10

R2(config-route-map)#match ip address 29

R2(config-route-map)#set ip next-hop 40.1.1.1

R2(config-route-map)#route-map EXAMPLE permit 20

R2(config-route-map)#match ip address 30

Assuming the route map has been applied to the router's ethernet0 interface, a packet sourced from 20.1.1.1 would meet the first line of the route map and have its next-hop IP address set to 40.1.1.1.

A packet sourced from 20.2.2.2 would match the next permit statement (sequence number 20). Since there is no action listed, this packet would return to the routing engine to undergo the normal routing procedure. All traffic that did not match these two addresses would also be routed normally - there would be no action taken by the route map.

Perhaps we want to specifically block traffic sourced from 20.3.3.3 or 20.4.4.4. We can use multiple match statements in one single route map, and have packets matching those two addresses sent to the bit bucket - the interface null0.

R2(config)#route-map EXAMPLE permit 30

R2(config-route-map)#match ip address 31

R2(config-route-map)#match ip address 32

R2(config-route-map)#set ?

as-path Prepend string for a BGP AS-path attribute

automatic-tag Automatically compute TAG value

comm-list set BGP community list (for deletion)

community BGP community attribute

dampening Set BGP route flap dampening parameters

default Set default information

extcommunity BGP extended community attribute

interface Output interface

ip IP specific information

level Where to import route

local-preference BGP local preference path attribute

metric Metric value for destination routing protocol

metric-type Type of metric for destination routing protocol

origin BGP origin code

tag Tag value for destination routing protocol

weight BGP weight for routing table

R2(config-route-map)#set interface null0

Any traffic matching ACLs 31 or 32 will be sent to null0, resulting in its being discarded by the router. Any traffic that didn't match any of the route map statements will be returned to the routing engine for normal processing.

Knowing policy routing and how to apply it are essential skills for passing the BSCI exam, earning your CCNP, and becoming more valuable in today's job market. Get some hands-on practice in a CCNA / CCNP home lab or rack rental to go along with learning the theory, and you'll be writing and applying policy routing in no time at all.

About The Author

Chris Bryant, CCIE #12933, is the owner of The Bryant Advantage (www.thebryantadvantage.com), home of free CCNP and CCNA tutorials! For my FREE "How To Pass The CCNA" or "CCNP" ebook, visit the website and download your copies. Pass your CCNP exam with The Bryant Advantage!

Using SMTP to Fake Mails

SMTP stands for simple mail transfer protocol. It is a simple protocol based on exchange of commands. There are lots of commands supported, you can view a list here. The first command used in SMTP is the HELO or EHLO (extended hello). This a way of greeting the server. The server will reply back with some form of greeting.
You can use SMTP to send fake mails read on at...
http://www.windowsecurity.com/whitepaper/How_to_Send_Fake_Mail_Using_SMTP_Servers.html