Re: [ns] Broadcasting to all neighbors

[Lucas Barriere <lucas.barriere@rp.lip6.fr>]

Have a look to arp.cc for the arprequest() function. It seems you should
add:

cmnhdr->iface() = iface_literal::ANY_IFACE;

>From packet.h:
		ANY_IFACE= -2   /* 
				 * hashnode with iif == ANY_IFACE_   
				 * matches any pkt iface (imported from TCL);
				 * this value should be different from 
				 * hdr_cmn::UNKN_IFACE (packet.h)
				 */ 

I believe you should also write:

cmnhdr -> direction() = hdr_cmn::DOWN; 

On Fri, 02 Jun 2000, Jeff Boleng wrote:
> Date: Fri, 02 Jun 2000 15:29:50 -0600
> To: ns-users@mash.CS.Berkeley.EDU
> From: Jeff Boleng <boleng@rmi.net>
> Subject: [ns] Broadcasting to all neighbors
> 
> I hate to ask a naive question, but how do you broadcast to
> all a node's neighbors?  I am writing a layer 3 agent, and
> trying to send a packet to an explicit port on all the
> neighboring nodes.  Here is my current code snippet:
> 
>   ...// this is all in the command function for my agent
> 
>   Packet* pkt = allocpkt();
>   hdr_cmn* cmnhdr = (hdr_cmn*)pkt->access(off_cmn_);
>   hdr_ip* iphdr = (hdr_ip*)pkt->access(off_ip_);
> 
>   ...// setting up all my new header information
> 
>   cmnhdr->next_nop_ = -1;  // according to the docs, this is
> broadcast
>   iphdr->daddr() = IP_BROADCAST;
>   iphdr->dport() = 254;  // this is the port number all my
> agents run on
> 
>   ...// just some things I do to track queue lengths, etc.
> 
>   send(pkt, 0);
> 
> 
> This doesn't work.  I get the following error from the
> classifier object's classify() method:
> 
> _o11: no target for slot -1
> 
> This is the address classifier saying that it doesn't have
> anything on that slot in the hash table.
> 
> I could take the brute force and ignorance approach and get
> the list of neighbors and send duplicate packets addressed
> to each of them, but this is ugly and defeats the purpose of
> having layers like IP provide services like broadcast.
> 
> Thanks for any help I can get.
> 
> Jeff Boleng
> boleng@rmi.net
> 
-- 
Lucas Barri�re

lucas.barriere@aemiaif.lip6.fr
http://aemiaif.lip6.fr/etudiants/lucas
UNIX is user-friendly. it's just selective about who its friends are.