DNS & IP Addresses (was Re: dich cai gi, khong dich cai gi)

["U't Say" <utsay@yahoo.com>]

   Anh NgoHa & anh CaoTri me^'n,

   Sau dda^y la` nh~ nha^.n xe't trung thu+.c, kho^ng co' y' che^ bai de`
bi?u, va` ra^'t tho^ng ca?m vo+'i hoa`n ca?nh internet cu?a VN.

   Theo to^i tha^'y co' va`i ddie^?m DNS o+? VN ca^`n gia?i quye^'t:

   1. VN ca^`n ngay class A addresses, kho^ng nha^'t thie^'t ca^`n pha?i
ddo+.i dde^'n IPv6.

   2. VN ne^n thay ddo^?i ca'ch ddie^`u ha`nh zone & DNS cho ro~ ra`ng va`
hie^.u nghie^.m. Ca'ch hie^.n tho+`i co' ve? luo^.m thuo^.m.

   Va`i ddie^?m sau dda^y ra^'t ... mo+ ho^` va` nghe kho^ng co' ly' cho
la('m:

   1. Vi` ly' do gi` APNIC chi? ca^'p cho VN 32 Class-C IP addresses? I't
nha^'t VN pha?i co' tu+` class B tro+? le^n, chu+' class-C addresses na`o
chi.u cho no^?i cho ca? mo^.t quo^'c gia\? Ne^'u APNIC cho+i e'p VN, chi?
cho "nga^`n a^'y" thi` to^i nghi~ co' the^? VN dda~ kho^ng/chu+a "chu+'ng
minh" ddu+o+.c so^' lu+o+.ng IP addresses ca^`n va`o lu'c la^.p ddo+n?
Ho+n nu+~a, Class-C addresses thi` thie^'u, chu+' class-A addresses thi`
co`n ra^'t nhie^`u! Ne^'u tu.i APNIC cho+i the^' thi` tha^.t dde^?u! Va`
VN ca^`n la`m ddo+n xin la.i mo^.t "block" class A dde^? tu+. tri.\.

   2. To^i kho^ng hie^?u ta.i sao -DHBK "mie^`n con" (sub-domain) la.i o+?
trong DNS cu?a VN (.vn)? DDa'ng le~ ra -DHBK pha?i o+? trong -DHQG (.edu)
va` ro^`i www/ftp cu?a -DHBK o+? trong -DHBK DNS (.hcmut) chu+'! DDa^y co'
pha?i la` policy va` tru+o+`ng ho+.p "kie^?m soa't cha(.t che~" cu?a .vn
kho^ng? Hay chi? la` thie^'u resources (hosts & DNS) cho ne^n mo+'i pha?i
ke^'t ho+.p nhie^`u sub-domains va`o trong mo^.t zone?

   3. To^i kho^ng nga.c nhie^n ne^'u -DHBK du`ng NAT & Masquerades trong
giai ddoa.n pho^i thai, gia?i quye^'t nha^'t tho+`i khi IP addresses co`n
thie^'u hu.t. Chu+' nhu+ du`ng ca'ch na`y dde^? gia?i quye^'t va^'n dde^`
security thi` qua' ... tho^ so+!. Co' nhu+~ng ca'ch gia?i quye^'t kha'c
elegant ho+n (VPN, Firewall, sec-router, sec-gateway).

   Tha^n cha`o,
   UtSay
   

--- Nguyen Cao Tri <caotri@dit.hcmut.edu.vn> wrote:
> Hi,
> > Hi ba'c Ut Say,
> > Ma.ng cu?a DHHBK HCM la` ma.ng Intranet. Ho. chi? dde^? mo^.t website
> > extranet cho "the^' gio+'i internet" va`o tho^i ba'c o+i, chi'nh vi`
> va^.y
> > ma` chi? tha^'y te^n mo^.t website. Ba'c Tri' o+? CNTT ma` kho^ng
> ra`nh
> > ddie^`u na`y u+ ?. Xa^y du+.ng intranet la`  ddu'ng tho^i vi`
> ddu+o+`ng
> link
> > co' 64Kbps.
> Ba'c no'i nhu+ va^.y la` kho^ng chi'nh xa'c vi` ma.ng dhqg va` ma.ng
> DHBK
> to^i la` ngu+o+`i thie^'t ke^' va` admin.
> 
> Tre^n DNS server cu?a Vie^.t Nam  chi? co' entry www.hcmut.edu.vn va`
> ftp.hcmut.edu.vn nhu+ la` 2 host
> ma` tho^i chu+' kho^ng pha?i la` 2 DNS Entry Do do cac subdomain cua
> DHBK
> va` cac daihoc khac khong the nhin thay tu the gioi.
> 
> Con tren DNS Intranet cua vietnam thi DNS server cua DHQG Intranet la
> mot
> DNS server entry.
> Duong link cua Intranet DHQG TPHCM ( ma` DHBK  la` member) ket noi voi
> postel 128Kbps va` Postel noi voi VDC 256Kbps ( hinh nhu+ moi tang len
> 512Kbps.
> 
> >
> > Ve^` ta`i nguye^n IP thi`  vo^'n lie^'ng APNIC cho VN tho+`i gian
> dda^`u
> > qua' khie^m to^'n(32 class C cho toa`n quo^'c, ba^y gio+` ta(ng le^n
> chu't
> > ddi?nh la` 64), nhu+ng to+'i dda^y se~ tie^'p qua?n vo^'n theo version
> mo+'i
> > (IPv6) thi` cha('c cha('n thoa?i ma'i. VN ddang chua^?n bi. tha`nh
> la^.p
> > VNNIC. Co' the^? trong tha'ng to+'i VNNIC ra ddo+`i. Lu'c ddo' vie^.c
> ca^'p
> > domain name, ip se~ thu le^. phi'. Ba^y gio+` "nghe`o IP"  thi` ca^'p
> > kho^ng, nay mai "gia`u IP" thi` cha.c tie^`n dda^'y ba'c. va^.y ba'c
> Tri'
> > muo^'n bao nhie^u IP dde^? pha't trie^?n  nhie^`u mie^`n con dde^`u
> thoa?i
> > ma'i, chi? co' ddie^`u ba'c pha?i ta(ng 64kbps le^n 256kbps, 512 kbps
> hay
> > 1E1... thi` mo+i dda'p u+'ng cho mo^.t ma.ng internet du`ng rie^ng
> co`n
> > kho^ng ba'c cu+' pha?i du`ng 64kbps dde^? ta?i tho^ng tin va`o trong
> > intranet cho ba` con du`ng.
> > va`i gia?i thi'ch nhu+ va^.y kho^ng biie^'t co' to? cho ba'c ddu+o+.c
> > kho^ng?
> > Cheers ba'c,
> > N.Ha
> ta`i nguyen IP cua mang DHQG la 32 registered IP address.
> Do do phai dung NAT va IP MAsquerate de cho phep intranet host connect
> to
> Internet. Rieng cac server thi hien tai co 14 entry vao DNS cua VIETNAM
> nhu
> la HOST. Cac IP khac khong co DNS name.
> 
> Nguyen Cao Tri
> HCMC University of Technology
> Department of Information Technology
> Tel: +84 8 8658689 (Office) +84 91 916290 (Mobile)
> Fax: +84 8 8653823 (Office) +1 419 7305282 (Personal)
> Email: caotri@dit.hcmut.edu.vn
> 
> 


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