Mng Lan oL mt trong nhng khi nim ca mng o (virtual network), VLAN l mt "mng con lun l" (logical subgroup) trong mt mng cc b (LAN) c to ra bng cch thit lp cu hnh (configured by software) bng phn mm ch khng phi "di chuyn cp" hoc s dng cc thit b phn cng c lp (Hub/switch) nhm cch ly gia cc nhm "mng con" vi nhau. Tin li ca vic kt ni mng cc b c rt nhiu nh chia s ti nguyn, dng chung my in ,chung kt ni Internet..., ti u ha hiu qu cng vic kinh doanh, tit kim thi gian, tit kim chi ph x l d liu, phn cp qun l v mt thng tin.... nhng thc t t doanh nghip thc c u th ny. Tm kim nhng l do thuyt phc s dng VLAN, bn c th dn chng v kh nng bo mt ca cc h iu hnh mng. cp mng ngang hng (peer-to-peer nerwork), bn c kh nng bo mt bng cch to cc mt khu (password) cho mi ti nguyn chia s cho cc ngi dng khc trn mng (share-level security). cc mng my tnh Khch - Ch (client-server network), vic bo mt an ton hn nh c ch bo mt ca my ch vi cc h iu hnh mng cao cp hn (nh Microsoft Windows NT Server v Novell Netware server). Do kh nng bo mt da vo "tn & mt khu truy cp" (login name & password), mi ngi truy cp vo mng u phi cung cp tn & mt khu. Tn v mt khu ny c ngi qun tr mng to sn (sau khi c to, mi ngi dng trong mng c th i mt khu c nhn theo ring ca mnh) v ng vi mi tn khc nhau s c nhng quyn truy cp khc nhau. Tuy nhin, tt c cc phng php bo mt trn c th d dng b v hiu hoc l mt khu. Trong trng hp , VLAN c th c s dng. Vi VLAN, mi ngi s dng trong cng ty s dng chung mt LAN Switch nhng mt s cng c "config" (thit lp ch ) hot ng hon ton c lp vi nhau. V d: ngi dng cc cng (port) 1,3,5,7,9 trong switch thuc phng K ton th cc my tnh c th "tm thy nhau", cc ngi dng phng k thut cng c th "tm thy nhau" cc cng 2,4,6,8,10. Khng th c chuyn mt nhn vin k ton c kt ni vo cng s 3 li c kh nng truy cp vo my tnh ca phng k thut cng s 6 c. V d minh ha: cng ty A c 3 phng l: Phng K Thut, Phng Kinh Doanh & Phng K Ton. Cng ty mun to lp mt mng my tnh gm 3 phn mng (LAN segment) l 3 mng LAN o, do tnh cht bo mt ca d liu kinh doanh k ton nn 3 phn mng ny s hot ng c lp vi nhau. Vic phn chia my tnh cc phng ban khc nhau thnh 3 mng con khc nhau nh vy nhm 2 mc ch chnh: Bo mt thng tin: cc my tnh phn mng ny s khng "thc mch" vo d liu nm trong cc my tnh thuc phn mng khc c. K thut to mng o ny s lm "b tay" ngay c nhng ngi "t m" v "cao th" nht. Ti sao "cao th" li phi b tay ? l do vic phn chia cc mng o (virtual LAN) c thc hin bi phn cng + phn do (firmware l cc chng trnh "phn mm" do cc nh sn xut thit b pht trin nhm iu khin trc tip cc thit b phn cng do h sn xut. Mt s v d n gin v firmware l BIOS trong my tnh, cc chng trnh iu khin hot ng ca cc in thoi di ng... ni chung: Firmware khng hot ng " mc qu thp" nn khng th gi l "phn mm", n cng "khng cng" gi l "phn cng") do nh sn xut phn cng ca mng nh Hub/Switch cung cp. Vic can thip v thay i d liu ca cc "phn do" (firmware) ny th hu nh khng th. Tng cng hiu qu ca mng v tc : mc d trong v d sau ti s dng mt Switch Repotec 24-port nhng do phn lm 3 mng con (sub group / LAN segment) nn mi mng ch c t 5- 6 my con. M s lng trm lm vic (my con) trong mng cng t th tc truyn ca mng cng cao. Mng LAN con ca phng K TON gm 5 my tnh con (ni vo cng s: 1,3,5,7,23) v mt my server (ni vo cng s 24). y l mt mng LAN o (VLAN) trong mng chung ca cng ty. Mng LAN con ca phng KINH DOANH gm 6 my tnh con (ni vo cng s: 2, 4, 6, 8, 9, 10). y cng l mt mng LAN o (VLAN) trong mng chung ca cng ty. Mng LAN con ca phng K THUT gm 3 my tnh con (ni vo cng s: 13, 14, 15). y cng l mt mng LAN o (VLAN) trong mng chung ca cng ty. n y, bn c th quyt nh nn hay khng nn dng mng ring o? Theo kythuatvien.com

VPN l vit tt ca (Virtual Private Networks) hay gi theo ting vit l Mng Ring o, cho php bn m rng phm vi ni b bng cch s dng li th ca Internet. K thut VPN cho php bn kt ni vi mt host nm xa hng ngn dm vi mng LAN ca bn v lm cho n tr thnh mt node nay mt PC na trong mng LAN. Mt c im na ca VPN l s kt ni gia clients v mng o ca bn kh an ton nh chnh bn ang ngi trong cng mt mng LAN. Cc loi VPN

C hai loi ph bin hin nay l VPN truy cp t xa (Remote-Access ) v VPN im-ni-im (site-to-site) VPN truy cp t xa cn c gi l mng Dial-up ring o (VPDN), l mt kt ni ngi dng-n-LAN, thng l nhu cu ca mt t chc c nhiu nhn vin cn lin h vi mng ring ca mnh t rt nhiu a im xa. V d nh cng ty mun thit lp mt VPN ln phi cn n mt nh cung cp dch v doanh nghip (ESP). ESP ny to ra mt my ch truy cp mng (NAS) v cung cp cho nhng ngi s dng t xa mt phn mm my khch cho my tnh ca h. Sau , ngi s dng c th gi mt s min ph lin h vi NAS v dng phn mm VPN my khch truy cp vo mng ring ca cng ty. Loi VPN ny cho php cc kt ni an ton, c mt m. Hnh minh ha cho thy kt ni gia Vn phng chnh v "Vn phng" ti gia hoc nhn vin di ng l loi VPN truy cp t xa). VPN im-ni-im l vic s dng mt m dnh cho nhiu ngi kt ni nhiu im c nh vi nhau thng qua mt mng cng cng nh Internet. Loi ny c th da trn Intranet hoc Extranet. Loi da trn Intranet: Nu mt cng ty c vi a im t xa mun tham gia vo mt mng ring duy nht, h c th to ra mt VPN intranet (VPN ni b) ni LAN vi LAN. Loi da trn Extranet: Khi mt cng ty c mi quan h mt thit vi mt cng ty khc (v d nh i tc cung cp, khch hng...), h c th xy dng mt VPN extranet (VPN m rng) kt ni LAN vi LAN nhiu t chc khc nhau c th lm vic trn mt mi trng chung. Trong hnh minh ha trn, kt ni gia Vn phng chnh v Vn phng t xa l loi VPN Intranet, kt ni gia Vn phng chnh vi i tc kinh doanh l VPN Extranet. Bo mt trong VPN Tng la (firewall) l ro chn vng chc gia mng ring v Internet. Bn c th thit lp cc tng la hn ch s lng cng m, loi gi tin v giao thc c chuyn qua. Mt s sn phm dng cho VPN nh router 1700 ca Cisco c th nng cp gp nhng tnh nng ca tng la bng cch chy h iu hnh Internet Cisco IOS thch hp. Tt nht l hy ci tng la tht tt trc khi thit lp VPN. Mt m truy cp l khi mt my tnh m ha d liu v gi n ti mt my tnh khc th ch c my mi gii m c. C hai loi l mt m ring v mt m chung. Mt m ring (Symmetric-Key Encryption): Mi my tnh u c mt m b mt m ha gi tin trc khi gi ti my tnh khc trong mng. M ring yu cu bn phi bit mnh ang lin h vi nhng

my tnh no c th ci m ln , my tnh ca ngi nhn c th gii m c. Mt m chung (Public-Key Encryption) kt hp m ring v mt m cng cng. M ring ny ch c my ca bn nhn bit, cn m chung th do my ca bn cp cho bt k my no mun lin h (mt cch an ton) vi n. gii m mt message, my tnh phi dng m chung c my tnh ngun cung cp, ng thi cn n m ring ca n na. C mt ng dng loi ny c dng rt ph bin l Pretty Good Privacy (PGP), cho php bn m ha hu nh bt c th g. Giao thc bo mt giao thc Internet (IPSec) cung cp nhng tnh nng an ninh cao cp nh cc thut ton m ha tt hn, qu trnh thm nh quyn ng nhp ton din hn. IPSec c hai c ch m ha l Tunnel v Transport. Tunnel m ha tiu (header) v kch thc ca mi gi tin cn Transport ch m ha kch thc. Ch nhng h thng no h tr IPSec mi c th tn dng c giao thc ny. Ngoi ra, tt c cc thit b phi s dng mt m kha chung v cc tng la trn mi h thng phi c cc thit lp bo mt ging nhau. IPSec c th m ha d liu gia nhiu thit b khc nhau nh router vi router, firewall vi router, PC vi router, PC vi my ch. My ch AAA AAA l vit tt ca ba ch Authentication (thm nh quyn truy cp), Authorization (cho php) v Accounting (kim sot). Cc server ny c dng m bo truy cp an ton hn. Khi yu cu thit lp mt kt ni c gi ti t my khch, n s phi qua my ch AAA kim tra. Cc thng tin v nhng hot ng ca ngi s dng l ht sc cn thit theo di v mc ch an ton. Sn phm cng ngh dnh cho VPN Ty vo loi VPN (truy cp t xa hay im-ni-im), bn s cn phi ci t nhng b phn hp thnh no thit lp mng ring o. c th l: - Phn mm cho desktop ca my khch dnh cho ngi s dng t xa. - Phn cng cao cp nh b x l trung tm VPN hoc firewall bo mt PIX. - Server VPN cao cp dnh cho dch v Dial-up. - NAS (my ch truy cp mng) do nh cung cp s dng phc v ngi s dng t xa. - Mng VPN v trung tm qun l. B x l trung tm VPN C nhiu loi my x l VPN ca cc hng khc nhau, nhng sn phm

ca Cisco t ra vt tri mt s tnh nng. Tch hp cc k thut m ha v thm nh quyn truy cp cao cp nht hin nay, my x l VPN c thit k chuyn bit cho loi mng ny. Chng cha cc module x l m ha SEP, cho php ngi s dng d dng tng dung lng v s lng gi tin truyn ti. Dng sn phm c cc model thch hp cho cc m hnh doanh nghip t nh n ln (t100 cho n 10.000 im kt ni t xa truy cp cng lc). Router dng cho VPN Thit b ny cung cp cc tnh nng truyn dn, bo mt. Da trn h iu hnh Internet IOS ca mnh, hng Cisco pht trin loi router thch hp cho mi trng hp, t truy cp nh-ti-vn phng cho n nhu cu ca cc doanh nghip quy m ln. Tng la PIX ca Cisco Firewall trao i Internet ring (Private Internet Exchange) bao gm mt c ch dch a ch mng rt mnh, my ch proxy, b lc gi tin, cc tnh nng VPN v chn truy cp bt hp php. Thay v dng IOS, thit b ny c h iu hnh vi kh nng t chc cao, xoay s c vi nhiu giao thc, hot ng rt mnh bng cch tp trung vo IP.Ln cp nht cui ( Ch nht, 19 Thng 6 2011 03:38 )

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Thit lp mng ring o VPN vi Remoboadmin | Apr 25, 2011 | Leave a Comment | 390 views

XHTTOnline: Remobo chnh l s kt hp hon ho ca BitTorrent (phn mm chia s file ngang hng ni ting), Hamachi v tnh nng Remote Desktop trong Windows. Vi Romobo bn c th to mng ring o c nhn (VPN), iu khin my tnh t mt my tnh bt k c kt ni internet, chia s cc file c dung lng ln hay chi cc tr chi ni mng vi cc game th hai na bn cu nh trong mng LANHy cng tc gi khm ph nhng tnh nng th v ca chng trnh. 1. Download v ci t u tin, bn download min ph phin bn Remobo 0.13.0 c dung lng 12.2 Mb t a ch http://www.remobo.com/download.php. Qu trnh ci t din ra tng i n gin, BitTorrent s c tch hp cng chng trnh, nu my c ci t, bn c th

b qua la chn ny. Tip , mt kt ni o s c thit lp, xut hin hp thoi cnh bo ca Windows, bn c click tip vo Continue Anyway hon tt. 2. Thit lp ti khon Khi ng chng trnh t mn hnh Desktop hoc Start Menu, trong ln chy u tin, chng trnh yu cu bn ng k mt ti khon trn remobo.com, bn in tn, mt khu, a ch email vo cc trng. n Next kt thc vic to ti khon. Remobo h tr 1 ti khon cho nhiu my tnh, ngha l bn c th s dng ti khon ny trn nhiu my tnh khc nhau, cng lc c my tnh nh v my tnh c quan vi cng mt username.

3. Thm vo cc ti khon kt ni (Add buddies) Sau khi to c ti khon, bn ng nhp vo chng trnh, click vo Menu chn Add new buddy. in tn ti khon cn kt ni v ch i bn kia chp nhn yu cu Add ca bn. Khi online, mt chm mu xanh s xut hin pha bn cnh biu tng ca my tnh v bn hon ton c th kt ni ti n.

Click chut vo tn ti khon (buddy) c trong danh sch ca chng trnh, mt hp thoi ca chng trnh xut hin vi mt s la chn chnh bao gm: 4. Gi file (Send a file) Cc file c gi thng qua chng trnh BitTorrent. Bn chn Send a File, ch ng dn n files hoc th mc cn gi, chng trnh a ra hai ty chn nng cao: Only share with this buddy and stop when i log out Ch chia s file cho my ang nhn v dng li khi my ch thot ra, hoc Add to my shared list so others can download it too a vo danh sch cc th mc chia s v ai cng c th download c. Sau khi n vo nt Send chng trnh s t ng to mt file torrent v gi ti ngi nhn (buddy). S dng mt chng trnh download torrent bt k (tc gi thng dng Utorrent Mt Torrent client nh gn min ph), ngi nhn d dng ti v file hoc th mc mnh cn. u im ca phng php ny l bn c th download cc file c kch thc ln trong mi thi im m khng lo b ngt kt ni, c bit tc gi/nhn file s cng nhanh nu c nhiu ngi gi/nhn cng lc. 5. Theo di cc file c chia s (View shared files) Chn View shared files, chng trnh s dn bn n ca s trnh duyt, trong c danh mc cc file v th mc c chia s trong mng bao gm tn v kch thc, nhp chut vo ni dung cn download, chng trnh torrent client mc nh trong my s gip bn ti file v.

6. Chia s file trong Windows (Windows File Sharing) Nu khng mun s dng Bittorrent, bn nn s dng chc nng Windows File Sharing, bn ch cn in ng ti khon v mt khu c cung cp l c th thao tc vi cc th mc chia s nh trong mng LAN.

7. Tr chuyn (Chat)

Chc nng chat trong Remobo gip bn trao i d dng vi cc my tnh khc ang kt ni. Tuy nhin, y ch l nhng tin nhn dng text, khng cha cc biu tng cm xc nh trong cc chng trnh chat thng thng. 8. Kim sot t xa (Remote Control) Tnh nng ny ging vi Remote desktop connection trong Windows, s rt thun tin cho vic ngi v iu khin my tnh c quan ngay ti nh v ngc li. Bn click vo tn my tnh ang kt ni m bn mun iu khin, chn Remote Control. in ng mt khu vo hp thoi VNC Viewer: Authentication l c th d dng kim sot cc my tnh t xa qua mng internet.

9. Mng ring o (VPN) Remobo cho php to ra mt mng ring o (VPN) vi thit lp d dng, v rt bo mt. Trong Remobo cc a ch IP o c gn cho tng my ang kt ni. Bn ch cn a chut n ti khon c trong list, thng tin v ti khon s xut hin. Click chut phi, chn Copy IP Address v dn n vo bt k ng dng no cn nh cc tr chi ni mng. n gin hn bn s dng a ch ca cc my theo dng: .remobo.com ..remobo.com

Nu bn thng chy mt s ng dng no , bn ch cn kch vo mt ti khon trong list ca chng trnh Menu v chn Add a New Application. T ca s xut hin, bn nhp tn ng dng, ng dn hoc dng cch ko th cc ng dng vo danh sch.

Lu : Ti khon cui cng trong danh sch chnh l ti khon ca bn qu trnh gi/nhn file bng BitTorrent din ra nhanh hn, bn nn tin hnh m port cho modem, c th xem hng dn chi tit cho tng loi modem ti trang web http://portforward.com/ Mc d mi ch l phin bn beta, nhng vi tnh nng tng hp ca hai phn mm Hamachi v BitTorrent, c bit l hon ton min ph. Hi vng, Remobo s l la chn hng u ca ngi s dng internet trong vic thit lp mng ring o c nhn./. Phm Vn Hiu XHTT

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Install and configure Linux VPNs FreeS/WAN Mi mo bo v mng ring o client

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