Wiki Information: http://en.wikipedia.org/wiki/Wiki http://en.wikipedia.org/wiki/Wikipedia:Introduction > -----Original Message----- > From: Brad Montgomery [mailto:[EMAIL PROTECTED] > Sent: segunda-feira, 3 de Julho de 2006 23:14 > To: [EMAIL PROTECTED] > Subject: Re: [ns] Multiple connections to a single agent > > Thank You! > I'll be sure to post my description on the Wiki site... > By the way, are there any guidelines for posting to the Wiki? AFAIK Not yet; the point is the users starting introduce useful informations, to create a better distributed documentation > > Brad > > > On 7/3/06 2:07 PM, "Pedro Vale Estrela" <[EMAIL PROTECTED]> wrote: > > > The problem is that the packets that you are sending to A3 have an > incorrect > > port address. > > > > When you use > > $ns connect $a1 $a2 > > then automatically all normal control packets sent by a1 have the > > destination port of a2; > > > > as a1 is not connected to a3 in TCL, you must set the port by hand in > C++, > > as NS will not do this for you, eg: > > > > void myAgent::recv(Packet* p, Handler *h) > > { > > hdr_ip *iph = hdr_ip::access(p); > > hdr_cmn *ch = hdr_cmn::access(p); > > > > ... > > > > iph->saddr() = addr(); // (set my IP address) > > iph->sport() = port(); // (set my source port) > > iph->daddr() = nextHop_iaddr; // iaddr of n3 > > iph->dport() = nextHop_iaddr; // port of a3 > > > > regarding the iaddr comment: check > > http://tagus.inesc-id.pt/~pestrela/ns2/ns2_haddr_tips.html > > > > In my ns2_shared_procs.tcl "utils" tcl file, I introduce procs for all > > possible conversions of each form, using the procs "handle2iaddr", > > "handle2haddr", "handle2id", etc. > > > > > > -------- > > you could also have debug this problem by: > > - redefining the no-slot handler to invoke the run-time TCL > > debugger; > > - use the mash inspector to find exactly who are _o153, _o158, etc > > (http://tagus.inesc-id.pt/~pestrela/ns2/ns2_debugging2.html) > > > > If this helps you, please contribute the description of the problem and > the > > solution, in your own words, to the NS2 wiki. > > > > Pedro Vale Estrela > > > > > > > >> -----Original Message----- > >> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On > Behalf > >> Of Brad Montgomery > >> Sent: segunda-feira, 3 de Julho de 2006 19:25 > >> To: ns-users@isi.edu > >> Subject: Re: [ns] Multiple connections to a single agent > >> > >> > >> I'm not sure I understand, and perhaps I've not adequately described > what > >> I'm trying to do, so I'll try again using a semi-hypothetical scenario: > >> (Please keep in mind I'm new to ns!) > >> > >> Suppose I've got the following topology: > >> > >> N1 - N2 - N3 > >> > >> And three "different" agents, (A1,A2,A3) which have all been > implemented > >> differently in C++. The basic idea is that I want these agents to > >> automatically communicate with each other... > >> > >> In C++ I've written an A1::command() function that will 'send' sends an > IP > >> packet to the A2 agent. When the A2 agent receives this packet, it > then > >> sends a packet back to A1, which then gets returned to A2 (basically a > 3- > >> way > >> handshake). A2 should then automatically send another packet to the A3 > >> agent by creating a packet, and inserting N3's address in the IP > header. > >> (I'm assuming all of my agents and nodes know about the topology) > >> > >> In TCL I've done this: > >> ------------------------------------ > >> set n1 [$ns node] > >> set n2 [$ns node] > >> set n3 [$ns node] > >> > >> set a1 [new Agent/A1] > >> set a2 [new Agent/A2] > >> set a3 [new Agent/A3] > >> > >> $ns attach-agent $n1 $a1 > >> $ns attach-agent $n2 $a2 > >> $ns attach-agent $n3 $a3 > >> > >> $ns connect $a1 $a2 > >> #$ns connect $a2 $a3 ;# if I do this, the handshake doesn't work > >> > >> $ns at 0.0 $a1 send > >> ------------------------------------ > >> > >> When I run this, ns gives me this error: > >> > >> --- Classfier::no-slot{} default handler (tcl/lib/ns-lib.tcl) --- > >> _o158: no target for slot 3 > >> _o158 type: Classifier/Port > >> content dump: > >> classifier _o158 > >> 0 offset > >> 0 shift > >> 2147483647 mask > >> 1 slots > >> slot 0: _o153 (Agent/A3) > >> ---------- Finished standard no-slot{} default handler ---------- > >> > >> > >> Basically I want A3 to look at any or all packets send to N3. How can > I > >> force this? > >> > >> I'm using ns-2.29 on Mac OS X 10.4.7. > >> > >> Thanks in advance! > >> > >> Brad > >> > >> > >> On 7/2/06 6:10 PM, "Mark Shifrin" <[EMAIL PROTECTED]> wrote: > >> > >>> no problem with tcp > >>> you can do attach agent as many time as you want to a single node. > >>> you must first define it as tcp-source. and then to choose the > >> application > >>> which runs over this > >>> tcp, for example i did it with FTP. moreover you can do it for n, > within > >> a > >>> loop > >>> > >>> --- Brad Montgomery <[EMAIL PROTECTED]> wrote: > >>> > >>>> > >>>> Hello All, > >>>> > >>>> I'm wondering if it's possible to have a single Agent connected to 2 > or > >> more > >>>> other Agents. I have a topology similar to this: > >>>> > >>>> N2 > >>>> | > >>>> N0 -- N1 -- N3 -- N4 > >>>> > >>>> I have an agents A0, A2, A3 connected to N0, N2, N3 respectively, and > I > >>>> would like A0 to send a packet to A2, which would then in turn send a > >> packet > >>>> to A3. Is this possible? > >>>> > >>>>> From reading the mailing list archives, it seems like this may not > be > >>>> possible, so my second question would be this: > >>>> > >>>> Is it possible to attach an agent to a Node, and force that agent's > >> recv > >>>> function to get executed for every packet that passes through that > >> node? > >>>> For example: Could N2 send a packet to N4, so that A3's recv function > >>>> processes that packet before sending it onward. > >>>> > >>>> Any help is GREATLY appreciated! > >>>> > >>>> Brad > >>>> > >>>> > >>> > >>> > >>> enjoy the life - > >>> Mark > >>> > >>> __________________________________________________ > >>> Do You Yahoo!? > >>> Tired of spam? Yahoo! Mail has the best spam protection around > >>> http://mail.yahoo.com > > > >
