[ns] estimate the network conditions !
Hello, I need to do the following : a node send a packet iff he estimate that his network conditions is good (the node want to minimize the probability of packet loss), by good conditions i mean no congestion, no collisions ... my questions ; 1- among the following conditions which ones i should use and how (in ns2) -awareness of the current queue size, -packet statistics at the routing layer (received, forwarded, dropped), -frame statistics at the link layer (received, retransmitted, dropped), -current random backoff timer, -and number of collisions, 2- how to combine them to make a final decision 3- is there any others conditions ? I appreciate your replies. Thanks, LEVY David.
[ns] can't send pkt (unicast/broadcast) - MANET ns2.30
Hello ns-suers, i can't send unicast or broadcast packets, I try several solutions, but no one works! 1- the code for unicast (sendUnicast(destination)) Packet* pkt = allocpkt(); hdr_cmn* hdrcmn = hdr_cmn::access(pkt); hdr_ip* iphdr = hdr_ip::access(pkt); hdr_monitor* hdrret = hdr_monitor::access(pktret); hdrret-ret = 1; hdrcmn-next_hop_ = destination; hdrcmn-prev_hop_ = this-addr(); hdrcmn-direction() = hdr_cmn::DOWN; hdrcmn-ptype() = PT_MONITOR; hdrcmn-addr_type() = NS_AF_INET; //NS_AF_INET; // NS_AF_ILINK; // setting the ip header iphdr-saddr() = this-addr(); iphdr-sport() = 100; // 1-254 iphdr-daddr() = destination; iphdr-dport() = 100; // 1-254 iphdr-ttl() = 32; fprintf(stderr, %d send request to %d \n,this-addr(),destination); // send Scheduler::instance().schedule(ll, pkt, 0.0); 2- for broadcast i use the following code Packet* pkt = allocpkt(); hdr_gc* hdr = hdr_gc::access(pkt); hdr-ret = 0; hdr_cmn* hdrcmn = hdr_cmn::access(pkt); hdr_ip* iphdr = hdr_ip::access(pkt); hdrcmn-next_hop_ = IP_BROADCAST; hdrcmn-prev_hop_ = this-addr(); hdrcmn-direction() = hdr_cmn::DOWN; hdrcmn-ptype() = PT_GC; hdrcmn-addr_type() = NS_AF_INET; //NS_AF_NONE NS_AF_ILINK; // setting the ip header iphdr-saddr() = this-addr(); iphdr-sport() = 101; // 1-254 iphdr-daddr() = IP_BROADCAST; iphdr-dport() = 101; // 1-254 iphdr-ttl() = 1; fprintf(stderr, %d send bcats\n,this-addr()); // send Scheduler::instance().schedule(ll, pkt, 0.0); // _target ! - i use the TclObject::lookup to get the ll. Thanks Regards
[ns] send unicast packets and packets to the direct neighbors !
Hello all, I have some questions : 1 - how to define an agent to send unicast packet (sendunicast(packet, * destination*)!) 2 - how to define an agent to send packets to *the direct neighbors *3- how to estimate the the number of the *one hop neighbors* 4 - how to define two types of node (type 1 with a behaviour and type 2 with another behavior) I need a component that estimate the network' state (congestion,...) you have an idea ? Thank you. David