Is it ok that DNS is used for name to ip and ip to named resolution
but
For which application a DNS is used in a LAN,

I think it can used for NFS, SAMBA or ... or any other tell me ?

And specifically in which application it is required for ip to name resolution ?

Am i right or not....

dns - domain name service

like you allready know it's for mapping ip's to hostnames.
it's an service every tcp/ip machine will use to do so and is for general (not related to another service).

if a request that should be send to, let's say, willie.the.pimp the tcp layer will send a request to an dns-server to resolve this to an valid ipaddress and then use this address to actually connect to willie.

sl mritch.

@mritch

Did u understood my question ?



-jack

All applications can use it.

For example which applications can use it ?

And how . plz tell me !



-jack

did you unterstood my answer?;-)

i'll try again:

dns was developed from the early ARPAnet (~ '69) where a simple hosts.txt (think of i like the /etc/hosts file) did the translation from machine names to their corresponding (a 32bit binary number) address.

in the eighties there where more and more computers connected and maintaing hosts.txt-files became a horror. dns was born.

i'd say:
every service that's working with a tcp/ip network and is able to speak with a resolver (rather think of the resolver more like a library) may use this function with the aim to do what you allready know: get a ip-address for the (for humans easier to recognize) na.m.e of that host.

the only application really works with the specific mechanism (dns) is
-the server (named/bind,dns-forwarders) on the knowing side and
-the client (nslookup/dig/host,resolver) on the other.

a lot of programs like mta's, browsers,... use dns but actually only communicate with the local resolver - they don't connect the dns-server directly.

google for "dns" and you'll sure find lot of information.

sl mritch.