[Ilugc] [OT] doubt on Networking on linux

[peevee]

 sorry for that wrong question on route and gateway ,,
 i mean to ask, is route table used to specify a predefined  incoming
 packets, to be sent to a destination address??
 if its case, how is gateway differnt from a  route table??



Binand Sethumadhavan wrote:

>On 25/04/05, peevee <peevee.chaitanya at gmail.com> wrote:
>  
>
>>hi luggies,
>>i want to know what the basic use of a loopback interface??
>>why is it used?
>>    
>>
>
>There is the obvious use of testing and using networking software on
>standalone machines. A lot of popular software do not look at
>additional access control when the connection is on the loopback
>interface. Apart from this, it has certain uses in routers (in load
>balancing configurations).
>
>  
>
>>i also want to know about the route command,
>> is it used to send specific incoming packets, to some specific
>>destinations precisely?
>>if thats the case,  are gateways build using route command?
>>    
>>
>
>route command does not send packets. It just alters the kernel routing
>table - which is consulted on a "longest match" principle, when
>packets are transmitted. I do not understand what you mean when you
>ask whether gateways are built using route command.
>
>In any case, route/ifconfig etc. are deprecated and obsoleted by the
>ip(8) command.
>
>  
>
>>and also what is the role of ARP cache?
>>why do we need to maintain it?
>>    
>>
>
>You need to maintain a cache of ARP lookup results so that every
>single packet to be transmitted does not require an ARP lookup (which
>would slow down your network considerably). Almost any caching service
>- be it your ARP cache, a web cache like squid or a DNS cache - is
>meant to speed up somebody's online experience.
>
>Binand
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