Merikes dieukriniseis parakalo!

[Symeonidis Alexandros]

telika oses erwtisis na su apantisume,esi tha sinexisis na rwtas ep
apiron...

na su dwsw mia simvuli/iposxesi ?

ase to linux isixo (de su xriazete),
ke su iposxome 8a s afisi ki afto...



"Richard Anderson" <hackeras at gmail.com> wrote in message
news:Xns9608A80BBCB6hackerasgmailcom at 194.177.210.210...
> Filippos Slavik <fsla at forthnet.gr> wrote in
> news:mailman.1615.1109340679.375.linux-greek-users at lists.hellug.gr:
>
> > On Thursday 24 February 2005 21:28, Richard Anderson wrote:
> >> Den einai akrivos linux erotiseis alla i have to ask them so to
> >> understand:
> >>
> >> 1) Episis DEN exo vgalei akri genikos! An den orisoume sto
> >> configuration utility tou adsl modem/router poia mac address tha
> >> parei poia specific ip address tote einai san na leme tou adsl
> >> modem/router oti kathe fora pou einai na apodosei ip addresses na
> >> apodidei opoia ip address thelei se opoia NIC thelei ,diladi opoia ip
> >> address thelei se opoio pc goustarei apo auta pou einai connected
> >> pano tou! Auto omos DEN mou fainetai kai toso kalo. Den tha eprepe to
> >> kathe pc sto lan na exei mia sygekrimeni static ip address i opoia
> >> tha ginentai kathe fora applied stin Nic tou?
> >
> > Kai to ena alla kai to allo boleuei. Se kapoies periptwseis 8eleis na
> > dineis IPs apo kapoio pool se hosts xwris na eksetazeis poia h MAC
> > tous, allwte 8eleis na dineis sygkekrimenes IPs se sygkekrimenes MAC,
> > allwte 8eleis na dineis IP mono se hosts pou gnwrizeis ths MAC tous,
> > klp, klp.
>
> KATARXAS OI APANTISEIS SOU HTAN KATAPLHKTIKES & KATATOPISTIKOTATES &
> PRAKTIKOTATES!!! Perigrafoun toso kala to thema pou me afisan *only* with
a
> couple of more extra description questions se sxesi me tis erotiseis pou
me
> afinoun alles allou yfous apantiseis. :-)
>
> Loipon,
>
> a) Giati na thelo na doso sygektimeni ip address se sygekrimeni NIC hence
> se sygektrimeno pc?
>
> Mipos epeidi thelo to sygekrimeno pc na trexei epi monimou vaseos enan web
> server ie. ton Apache therefore tou xreiazetai i standard ip address etsi
> oste na xerei o adsl modem/router se poio specific host/port na kanei
> forward ta paketa tou "exo" kosmou allios o router (an allaze i ip address
> tou mixanimatos pou trexei ton web server ) den tha ixere pou na kanei
> forward ta paketa kai isos ta estelne se kapoio allo asxeto pc, pou
> endexomenos na eixe stin request web page phase tin ip address pou eixe
> proigoumenos to "real" web server pc? :-)
>
> Diladi in other words allos perimenei ta requests kai allos ta
> paralamvanei? Kati san allos exei to onoma kai allos tin xari ? :-)
>
> b) Giati na thelo na doso ip address mono se hosts pou gnorizo tin MAC
> address tous? Pou tha me exypiretouse kai tetoio? Mipos epeidi kapoios
> epitideios pigaine kai exone to pc tou kryfa se ena lan, to ethete se
auto-
> obtain mode, kai meta me tin seira tou o adsl router to pairnouse gia ena
> apo ta paidia tou kai tou moiraze aploxera info apo to inet alla kai
> genikotera tou epetrepe na ekane share kai olou ton allon pliroforion pou
> tha diakiniotane sto lan?
>
> Hackeria in other words??!!
>
> >> 2) Sto Cleint Ip Pool Starting Address giati xekinate oloi vazontas
> >> 192.168.1.x kai oxi kapoia alla tyxeia noumera. Starting address
> >> legetai giati auto pairnetai os vasi gia na
> >> arxisei kai na synexistei i onomatodosia ton ip address?
> >
> > Yparxoun merikes IP oi opoies legontai reserved kai xrhshmopoiountai
> > gia internal dyktia ta opoia den einai routable apek'sw. To C class
> > network (des http://www.webopedia.com/TERM/C/Class_C_network.html)
> > 192.168.1.0 einai ena apo ta poio xarakthristika pou xrhshmopoiountai
> > gia tetoious logous (yparxoun kai alla bebaia).
>
> Nai, tora katalava, den ixera tin yparxei teoion reserved
non-inet-routable
> ip addresses.
>
> > 8a mporouses na baleis esy sto eswteriko sou dyktio opoio "starting
> > address" 8eleis, alla einai pi8anon na exeis problhma. Px mporeis na
> > baleis to 194.63.247.0, alla kapoio mhxanhma sto eswteriko sou dyktio
> > einai pi8ano na parei apo ton router (apo to DHCP daemon basika) thn
> > 194.63.247.208 (www.in.gr). Auto katalabaineis thn problhma dhmiourgei
> > profanws sto eswteriko sou dyktio -> den mporeis na bgeis pros to
> > dyktio 194.63.247.0 (to opoio einai kapou sto real internet) .. kai
> > gia na sto poio praktika, kapoios sto eswteriko sou dyktio 8a
> > prospa8hsei na anoiksei thn selida tou www.in.gr kai 8a epikoinwnhsei
> > telika me kapoio allo mhxanhma sto eswteriko sou diktuo.
>
> Nai, sosta. Alla auto tha itan genikos mikro to kako apo tin apopsi oti
> mono to sygekrimeno real host den tha mporouse na dei o typos emsa po to
> lan, ta alla ok!
>
> Alla kai tora pou to skeftomai tha mporousame na to ekmetaleutoume deonots
> auto apo tin apopsi oti tha mporousame na to kanoume epitides gia ena
> gnosto host/gnosti selida px opos tou web mail provider tou. Tha nomize
> autos oti dinei to login info tou sto px mail.in.gr eno stin ousia emeis
> tha eixame setarei ena all pc sto lan na apantaei fake se auto request kai
> na loggarei ta data tou!
>
> Kalo e? :") hackerioula again....
>
> >> 3) Akoma den katalava ti paizei me to NAT, se ti akrivos xreiazetai
> >> akthos kai gia to Port Forwarding.....
> >
> > NAT -> http://www.webopedia.com/TERM/N/NAT.html kai sigoura polla alla
> > resources sto dyktio gia na katalabeis ti einai auto. Praktika auto
> > shmainei gia sena: Exeis ena local dyktio (pisw to apo to adsl
> > routeraki sou gia paradeigma) me IPs apo to 192.168.1.0/24. To adsl
> > routeraki sou otan syndeetai sto dyktio apokta mia IP (h opoia einai
> > pragmatiki) kai einai routable pros kai apo ton kosmo (to internet).
> > Auto pou kanei twra to NAT einai oti ka8e paketo pou er8ei apo kapoio
> > host apo to eswteriko sou kai 8elei na bgei pros ta eksw, "allazei"
> > ligo kai bgainei pros ta eksw me thn IP tou router/adsl (opote einai
> > valid gia na ginei route). To routeraki "8ymatai" poianou host apo to
> > eswteriko dyktio htan to paketo pou molis ekane forward ston eksw
> > kosmo kai otan er8ei h apanthsh apo ton eksw kosmo (px h html selida
> > pou zhthses [xarhn aplwthtas twra]) tote to paketo auto ginetai
> > forwared sto host tou eswterikou sou dyktiou. Auto legetai kai SNAT
> > (Source NAT). To port forwarding einai na exeis thn dynatotha na
> > kaneis mapping kai na les kati sto styl "otan erxetai ena paketo apo
> > ton eksw kosmo sthn IP tou adsl/router kai se kapoio port tote auto to
> > paketo na ginetai forwarded sto host x kai port y tou eswterikou sou
> > diktiou. Auto praktika shmanei pws mporeis na exeis ena host sto
> > eswteriko sou diktio pou na trexei enan apache kai na einai "visible"
> > pros ton eksw kosmo (kati pou den 8a htan efikto an den eixes NAT &
> > Port forwarding).
>
> Kali fasi!
>
> Stin ousia to NAT "KRYVEI" tin yparxi OLON ton hosts tou esoterikou mas
> lan, eno to lan mas zei kai vasileuei! Kai oxi mono auto alla einai able
na
> pairnei/dinei dedomena meso tou adsl modem/router pou tora ginetai kai
> proxy tautoxrona!!
>
> Eipes oti to paketa apo to internal host prin vgei exo allaxei ligaki.
>
> Allazei = Sto header information pou exei to packet itself, o routerakos
> metapoiei to source ip address apo auto tou host proeleusis tou paketou
> stin diki tou ip address?!?
>
> Kai ektos etsi einai kai valid e? Logo tou oti an den to ekane auto to
> 192.168.0.x tha itan non valid ip address gia na steilei/parei to paketo
> afou den einai routable, auto diladi pou legame sto 1?!?
>
> Ara kai Valid + Hidden o internal host mas! Mpraaaavo!
>
> Xmmm, to routeraki omos pos thymatai tin origin tou paketou gia na tou
> steilei to response? Krataei kapoio internal database gia na kanei tis
> antistoixiseis?
>
> To NAT diladi einai ena pragma san bridging metaxy internal LAN kai
> INTERNET. Voithaei kyrios ta exerxomena paketa deixnontas tous to dromo na
> vgoun pros to net kathos kai na gyrisoun eno to port forwarding apo tin
> alli mas voithaei poly emas me ta eiserxomena ston rouer paketa etsi oste
> na ta deixeiristouem opso goustaroume stelnontas sto diaolo an einai "bad"
> i ekei pou stisame tin en logo ypiresia ie web server!
>
> Nomizo ta katalava ola auta pou eipes, an kapou esfala diorthose me!
>
> >> Sorry again pou oi erotisiseis den einai linux oriented alla tha
> >> prepei kapoia stigmi na ta ksekathariso auta.....
> >
> > Yparxoun pantws polla resources & howtos pou mporeis na diabazeis gia
> > ta pramata pou rwtas se poly kalyterh diatypwmenh morfh apo'ti sta lew
> > egw (allwste egw sou apantaw praktika) kai se non-formal yfos.
>
> Mia xara ta les Slaviko! :-) Panta mou aresei na mathaino kati "praktika"
> gia na ksero pos sto kalo tha mou fanei xrisimo kathos kai ta vlepo se
> friendly non-formal manner!
>
> Na sai kala!
>