วันศุกร์ที่ 12 กุมภาพันธ์ พ.ศ. 2553

Home Network Security

This document gives home users an overview of the security risks and countermeasures associated with Internet connectivity, especially in the context of “always-on” or broadband access services (such as cable modems and DSL). However, much of the content is also relevant to traditional dial-up users (users who connect to the Internet using a modem)

# Computer security

1. What is computer security?

Computer security is the process of preventing and detecting unauthorized use of your computer. Prevention measures help you to stop unauthorized users (also known as "intruders") from accessing any part of your computer system. Detection helps you to determine whether or not someone attempted to break into your system, if they were successful, and what they may have done.
2. Why should I care about computer security?

We use computers for everything from banking and investing to shopping and communicating with others through email or chat programs. Although you may not consider your communications "top secret," you probably do not want strangers reading your email, using your computer to attack other systems, sending forged email from your computer, or examining personal information stored on your computer (such as financial statements).
3. Who would want to break into my computer at home?

Intruders (also referred to as hackers, attackers, or crackers) may not care about your identity. Often they want to gain control of your computer so they can use it to launch attacks on other computer systems.

Having control of your computer gives them the ability to hide their true location as they launch attacks, often against high-profile computer systems such as government or financial systems. Even if you have a computer connected to the Internet only to play the latest games or to send email to friends and family, your computer may be a target.

Intruders may be able to watch all your actions on the computer, or cause damage to your computer by reformatting your hard drive or changing your data.
4. How easy is it to break into my computer?

Unfortunately, intruders are always discovering new vulnerabilities (informally called "holes") to exploit in computer software. The complexity of software makes it increasingly difficult to thoroughly test the security of computer systems.

When holes are discovered, computer vendors will usually develop patches to address the problem(s). However, it is up to you, the user, to obtain and install the patches, or correctly configure the software to operate more securely. Most of the incident reports of computer break-ins received at the CERT/CC could have been prevented if system administrators and users kept their computers up-to-date with patches and security fixes.

Also, some software applications have default settings that allow other users to access your computer unless you change the settings to be more secure. Examples include chat programs that let outsiders execute commands on your computer or web browsers that could allow someone to place harmful programs on your computer that run when you click on them.

Following issues.

วันอังคารที่ 9 กุมภาพันธ์ พ.ศ. 2553

wireless access points and routers

Nearly all wireless access points and routers allow an administrator to manage their WiFi network through a special administrative account. This account provides complete "superuser" access to the device's configuration utilities with a special username and password.
Manufacturers set both the account username and password at the factory. The username is often simply the word admin or administrator. The password is typically empty (blank), the words "admin," "public," or "password," or some other simple word.
To improve the security of a Wi-Fi network, you should change the administrative password on your wireless access point or router immediately when installing the unit. The default passwords for popular models of wireless network gear are well-known to hackers and often posted on the Internet. Most devices do not allow the administrative username to be changed, but if yours does, seriously consider changing this name as well.
Finally, to maintain home network security in the future, continue changing this administrative password regularly, not just one time. Many experts recommend changing passwords every 30 to 90 days. Use words that would be very difficult for others to guess.
Wireless access points (APs or WAPs) are specially configured nodes on wireless local area networks (WLANs). Access points act as a central transmitter and receiver of WLAN radio signals.
Access points used in home or small business networks are generally small, dedicated hardware devices featuring a built-in network adapter, antenna, and radio transmitter. Access points support Wi-Fi wireless communication standards.


Although very small WLANs can function without access points in so-called "ad hoc" or peer-to-peer mode, access points support "infrastructure" mode. This mode bridges WLANs with a wired Ethernet LAN and also scales the network to support more clients. Older and base model access points allowed a maximum of only 10 or 20 clients; many newer access points support up to 255 clients.

วันพุธที่ 23 ธันวาคม พ.ศ. 2552

ราคาหมึก

Brand Model Description Price
Inkjet Cartridge
Canon BC-03 BJ INK BLACK FOR BJC-210SP/255SP/256SP/1000SP 1,117
Canon BC-05 COLOR KIDS INK FORBJC-210SP/255SP/265SP/1000SP 1,206
Canon BC-33E PRINT HEAD FOR BJC-3000/S400 2,143
Canon BCI-15BK BLACK INK CARTRIDGE FOR I70 498
Canon BCI-15CO COLOR INK CARTRIDGE FOR I70 974
Canon BCI-16CO INK FOR PRINTER IP90/SELPHY-DS700 974
Canon BCI-21BK INK BLACK FOR BJC4000SERIES/5100/5500/2100SP/S100SP 286
Canon BCI-21COLOUR INK COLOUR FOR BJC4000SERIES/5100/5500/2100SP/S100SP 711
Canon BCI-24BK INK CARTRIDGE BLACK FOR S300 267
Canon BCI-24BK-TWIN INK CARTRIDGE BLACKFOR S300 457
Canon BCI-6G GREEN INK TANK i990/i9950 349
Canon BCI-6P C INK PHOTO FOR S800 349
Canon BCI-6P M INK PHOTO FOR S800 349
Canon BCI-6R RED INK TANK i990 349
Canon CL-831CO COLOR INK FOR IP1880/2580/MP145/228/460/476/MX308/318 711
Canon CLI-36CO COLOR INK CARTRIDGE FOR iP100 571
Canon CLI-821BK INK CARTRIDGE-BLACK FOR IP3680/4680/MP545/628/638/988 400
Canon CLI-821C INK CARTRIDGE-CYAN FOR IP3680/4680/MP545/628/638/988 400
Canon CLI-821GY INK CARTRIDGE-GREY FOR IP988 400
Canon CLI-821M INK CARTRIDGE-MAGENTA FOR IP3680/4680/MP545/628/638/988 400
Canon CLI-821Y INK CARTRIDGE-YELLOW FOR IP3680/4680/MP545/628/638/988 400
Canon PG-50BK BJ INK BLACK FOR MP450/MP150(HIGH YIELD) 1,041
Canon PG-810XL Ink Black Cartridge Size XL 667
Epson T103190 BLACK INK CTRG L SIZE T40W/TX600FW 700
Epson T103390 MAGENTA INK CTRG L SIZE T40W/TX600FW 432
Epson T105190 BLK-C79/90/110/CX3900/5900/5500/7300/8300/T11,20E,TX200/400 366
Epson TO07091BK Stylus Photo 870/875DC/890/895/1270/1290 Black 681
Epson TO08091CO Stylus Photo 870/875DC/890/895 Color 699
Epson TO52090CO Color Ink Cartridge Stylus Color 400/600/740/800 921
Epson  TO54090 GLOSS OPTIMIZER INK CARTRIDGE EPSON STYLUS PHOTO R800 271
Epson TO76190 BLACK INK CARTRIDGE FOR EPSON STYLUS C58/CX2800 189
Epson TO76290 CYAN INK CARTRIDGE FOR EPSON STYLUS C58/CX2800 189
Epson TO76390 MAGENTA INK CARTRIDGE FOR EPSON STYLUS C58/CX2800 189
Epson TO76490 YELLOW INK CARTRIDGE FOR EPSON STYLUS C58/CX2800 189
Hp 51604A THINK JET/QUITE JET 499
Hp 51626A DESKJET 400DJ, 500 SERIES (BK) 1,201
Hp  51640A DESKJET 1200C, 1200C/PS (BK) 1,140
Hp 51641A DESKJET 820CXI, 850C, 870CXI, 1000CXI (CO) 1,234
Hp 51644C DESKJET 700 SERIES/COPYJET/M 1,132
Hp 51644M DESKJET 700 SERIES/COPYJET/M 1,132
Hp 51644Y DESKJET 700 SERIES/COPYJET/M 1,132
Hp 51645A DESKJET 800CXI, 850C, 870CXI, 1600C (BK) 1,090
Hp 51649A DESKJET 600, 660C, 670C, 690C, 692C (CO) 1,234
Hp C1823D#23 DESKJET 720C, 30ML (CO) 1,334
Hp C4844A DESIGNJET500/800 COPYCC800PS CP1700 1,193
Hp C5019A HP 84 Black Printhead 1,224
Hp C6578D#78 DESKJET 970CXI (CO) 1,211
Hp C6614A#20 DESKJET 610C/640C (BK 1,144
Hp C6615A#15 DESKJET 810C, 840C, (BK) 1,030
Hp C6625A#17 DESKJET 840C, 845C (CO) 1,121
Hp C6656A DESKJET 450/5550 BK 19ml 726
Hp C9351A HP 21 Black Inkjet Cartridge with PSC1410/1402 551
Hp C9351B HP 21b Black Everyday Cartridge 300
Hp C9352A HP 22 Tricolor Inkjet Printer Cartridge wich PSC1410/1402 634
Hp C9352C HP 22XL Tricolor Ink Cartridge PRINT 415 PAGES 1,078
Hp C9361W HP 93 Tricolor AP Inkjet Cartridge 704
Hp C9362W HP 92 AP Black Inkjet Cartridge 528
Hp C9364W HP 98 AP BLACK INKJET PRINT CARTRIDGE 612
Hp CB316W HP 564 Black Ink Cartridge PRINT 250 PAGES 419
Hp CB317W HP 564 Photo Black Dye PRINT 130 PHOTOS 349
Hp CB318W HP 564 Cyan Dye PRINT 300 PAGES 349
Hp  CB319W HP 564 Magenta Dye PRINT 300 PAGES 349
Hp CB320W HP 564 Yellow Dye PRINT 300 PAGES 349
Hp CB321W HP 564xl Black Ink Cartridge PRINT 800 PAGES 1,044
Hp CB322W HP 564 XL Photo Black Dye PRINT 290 PHOTOS 656
Hp CB323W HP 564 XL Cyan Dye PRINT 750 PAGES 656
Hp CB324W HP 564 XL Magenta Dye PRINT 750 PAGES 656
Hp CB325W HP 564 XL Yellow Dye PRINT 750 PAGES 656
Hp CB335W HP 74 BLACK INKJET PRINT CARTRIDGE 562
Hp CB336W HP 74XL Black Inkjet Print Cartridge 1,103
Hp CC654A HP Officejet 901xl Black Ink Cartridge 985
Hp CC656A HP Officejet 901 Tri-color Ink Cartridge 809
Toner
BROTHER DR-200 DRUM FOR FAX-2650,2750,MFC-6550MC,6650MC 4,804
BROTHER DR-2025 DRUM FOR HL-2040,2070N,DCP-7010,7420,7820N,FAX-2820 2,880
BROTHER DR-3000 DRUM FOR HL-5140,5150D,5170DN 4,804
BROTHER TN-200 TONER FOR FAX-2650,2750,MFC-6550MC,6650MC(2,200pages) 1,243
BROTHER TN-2025 TONER FOR HL-2040,2070N,DCP-7010,MFC-7220,7420,7820N,FAX2820 1,628
BROTHER TN-3030 TONER FOR HL-5140,5150D,5170DN (3,500 PAGES) 1,917
BROTHER TN-3290 TONER FOR HL-5340D,5350DN,5370W,5380DN (8,000 PAGES) 3,492
BROTHER TN-4100 TONER FOR HL-6050D,6050DN (7,500 pages) 3,360
CANON CARTRIDGE-301BK TONER FOR LBP5200/MF8180 C 2,900
CANON CARTRIDGE-301C TONER FOR LBP5200/MF8180 C 3,467
CANON CARTRIDGE-301Y TONER FOR LBP5200/MF8180 C 3,467
CANON CARTRIDGE-308 TONER FOR LBP3300/3360 2,500 PIECES 2,298
CANON CARTRIDGE-309 TONER FOR LBP3500 7,179
CANON CARTRIDGE-313 LASER TONER FOR LBP3250 2,389
CANON CARTRIDGE-U TONER FOR MF-5630/5650/5750/MF3222 2,313
CANON EP-22 TONER CARTRIDGE FOR LBP-800/LBP810/LBP1120/(2,500PAGE) 2,253
CANON EP-25 TONER CANON FOR LBP-1210 /2500 PAGE 2,428
CANON EP-26 CANON LASER TONER CARTRIDGET LBP3200,MF3110/(2500PAGE) 2,198
CANON EP-32 TONER FOR LBP-1000/(5000PAGE) 3,870
CANON FX-9 TONER CARTRIDGE FOR MF4122/MF4150 (2K) 2,198
EPSON SO50010 DEVELOPER CARTRIDGE (TONER) EPL-5700/5800 4,225
EPSON SO50166 BLACK DEVELOPER CARTRIDGE(6K) FOR EPL-6200 4,120
EPSON SO50167 BLACK DEVELOPER CARTRIDGE-3K EPL-6200/6200L 2,556
EPSON SO50187 YELLOW TONER 4K AL-C1100/N 4,990
EPSON SO50188 MAGENTA TONER 4K AL-C1100/N 4,990
EPSON SO50189 CYAN TONER 4K AL-C1100/N 4,990
EPSON  SO51055 PHOTO CONDUCTOR EPL-5700/5700L/5800/5900/5900L/6100/6100L 2,886
EPSON SO51099 PHOTO CONDUCTER UNIT -20K EPL-6200/6200L 1,807
FUJI XEROX 108R00575 WASTE CARTRIDGE PHASER 7750 991
FUJI XEROX 109R 00639 Phaser 3110/3210 Drum Print Cartridge 3,228
FUJI XEROX CT200226 DOCUPRINT C1618 BLACK TONER 6K 2,403
FUJI XEROX CT200227 DOCUPRINT C1618 CYAN TONER 6K 6,251
HP 92298A LASERJET 4/4M/4PLUS/4M PLUS/5/5M/5N 3,410
HP C3903F LASERJET 5P/5MP/6P/6MP 2,648
HP C3906F LASERJET 5L/6L/3100/3150 2,203
HP C4092A LASERJET 1100 SERIES/3200 1,915
HP C7115A LASERJET 1000/1200 SERIES/3300 1,992
HP C8543X HP TONER CARTRIDGET FOR LASERJET 9000 SERIES 8,931
HP C9700A COLOR LASER JET2500 (BK) 2,681
HP C9701A COLOR LASER JET2500 (CA) 3,230
HP CB435A HP LaserJet P1006 Black Cartridge 1,968
HP CB540A HP Color LaserJet Black Print Cartridge 2,288
HP CB541A HP Color LaserJet Cyan Print Cartridge 2,092
HP CB543A HP Color LaserJet Magenta Print Cartridge 2,092
HP CC364A HP LaserJet 10K Black Toner Cartridge 4,994
HP CC531A HP Color LaserJet CP2025 Cyan Crtg 3,752
HP CE505A HP LASERJET BLACK PRINT CARTRIDGE 2,835
HP Q2612A LASERJET PRINTER CARTRIDGES LJ1010 SERIES 2,264
HP Q2612AD HP LaserJet Q2612A Dual Pack Black Print Cartridges 3,848
HP Q2613A HP ULTRAPRECISE PRINT CARTRIDGE FOR LJ1300 SERIES 2,313
HP Q2624A HP LJ PRINT, LJ 1150 SERIES. 2,313
SAMSUNG ML-2150D8/SEE Toner for ML-2150/ 2151N (8,000 pages @ 1.00 THB/Page) 5,909
SAMSUNG  ML-2250D5 Toner for ML-2250/ML-2251N (5,000 pages) 3,876
SAMSUNG ML-D2850A TONER FOR ML-2850D/ML-2851ND (2,000 PAGES) 3,004
SAMSUNG ML-D3470A TONER FOR ML-3470D/ML-3471ND (4,000 PAGES) 4,097
SAMSUNG MLT-D108S TONER FOR ML-1640/ML-2240 (1,500 PAGES) 1,911
SAMSUNG MLT-D109S TONER FOR SCX-4300 (2,000 PAGES) 2,131
SAMSUNG MLT-D209L TONER CARTRIDGE FOR SCX-4828FN (5,000 PAGES) 3,391
SAMSUNG MLT-D209S TONER CARTRIDGE FOR SCX-4828FN,4824FN/ML-D2855ND (2,000 P) 2,518
SAMSUNG SCX-4100D3 TONER FOR SCX-4100 (3,000 PAGES) 3,004
SAMSUNG SCX-D4200A TONER FOR SCX-4200 (3,000 PAGES) 2,783
SAMSUNG SCX-D4725A TONER CARTRIDGE FOR SCX-4725FN (3,000 pages) 2,783
SAMSUNG SCX-D5530A TONER CARTRIDGE FOR SCX-5530FN (4,000 PAGES) 4,097
SAMSUNG SCX-D5530B TONER CARTRIDGE FOR SCX-5530FN (8,000 PAGES) 5,080
SAMSUNG SF-D560RA TONER FOR SF-565PR / 3,000 PAGES 3,004