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

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

   Anh Cao Tri me^'n,

   Vie^.c -DHBK xin IP addresses tu+` My~ to^i xem kho^ng o^?n, vi` ti'nh
ra -DHBK na(`m du+o+'i zone cu?a .edu.vn, va` nhu+ anh no'i, la` mo^.t
member cu?a -DHQG; vi` the^' ne^'u IP addresses (cho du` class-B) thi`
cu~ng ... ho+n lo^.n xo^.n. To^'t nha^'t va^~n la` xin tha(?ng tu+` .edu
zone dde^? tu+. tri. zone cu?a mi`nh, rie^ng cho -DHBK.

   DDu'ng ra -DHQG co' the^? ddu+'ng rie^ng va` -DHBK kho^ng ca^`n ddu+'ng
du+o+'i domain cu?a -DHQG. Ca? hai dde^`u o+? du+o+'i domain .edu cho
ro^.ng ddu+o+`ng xoay so+?, chu+' cu+' lo^`ng va`o nhau e kho^ng tie^.n
ve^` sau khi zone khue^'ch tru+o+ng lo+'n.

   Vie^.c APNIC ca^'p IP cho VN la` ddu'ng, bo+?i vi` VN na(`m trong pha.m
tru` cu?a APNIC. Tuy nhie^n APNIC dda'ng le~ ra pha?i ca^'p nhie^`u ho+n.

   Va`i do`ng y' kie^'n.

   Tha^n cha`o,
   UtSay
---

--- Nguyen Cao Tri <caotri@dit.hcmut.edu.vn> wrote:
> DHBK dung NAT va masquerate la vi khong du IP cho cac may .
> 
> Toan bo intranet cua DHQG co gan 2000 may tinh nhung chi co 32 IP
> registered
> tho^i. Ne^n ddo la giai phap.
> 
> 
> >    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.
> 
> DHBK cung da tham du inet 99 ta.i My~ va` ho. ddo^`ng y' cho mo^.t class
> B
> nhung ma thu tuc de routing ve den DHBK thi XIN mot qua nen thoi.
> Hon nua hien tai duong truyen cung qua cham nen chua xin lam gi`
> 
> >
> >    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?
> 
> cac entry cua www.hcmut.edu.vn , va cac truong dai hoc khac chi la mot
> host
> entry thoi khong phai la mot DNS server entry
> 
> >
> >    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).
> >
> Khong pha?i vi` security dau.
> Security da co firewall - packet filltering,...
> 
> 
> 
> 


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