[ns] Parameters of IP?

[Anis Koubaa]

Hi
I want to know what these parameters defined in ip.h refers to :
/*****************************************************************************/
ns_addr_t src_; (I think it is the source of packet. But is it
filled        automatically when we send a packet or we must specify it
before sending?)
ns_addr_t dst_; (This is the destination of the packet.)
int ttl_; (what does it refer to?)
"u_int16_t sport_ ;"(what does refer to ? and what is the utlity)
"u_int16_t dport_ ;"(what does refer to ? and what is the utlity)
int fid_;
int prio_;
/*****************************************************************************/

thank you

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        Cordialement
        
Koubaa Anis 
Organization : LORIA Nancy
Equipe : RESEDAS
Adresse : CU Haute Malgrange Vandeoeuvre Nancy Bloc C 528
Mail : akoubaa@loria.fr
Projet : Comparaison des Protocoles de clés de distribution de clé de
groupe en utilisant NS
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