I've got the same problem, and using this code does not solve the problem
for all cases (in my particular simulation)
Instead, I'm using this with great success:
In C++, at the top of ARPTable::arpresolve , insert this code that requires
#include utils_ns.h (see
http://tagus.inesc-id.pt/~pestrela/ns2/contributed_code.html#_Toc147652229)
--- cut here ---
TCL_EVALFr(ARP_find_mobile_iaddr2mac %d, dst);
LL *ll = (LL *)TclObject::lookup(Tcl::instance().result());
if(!ll){
dprintf(Error: LL empty\n);
exit(-1);
}
int mac = ll-mac_-addr();
mac_-hdr_dst((char*) HDR_MAC(p), mac);
return 0;
--- cut here ---
then, add this tcl code to your script or /tcl/lib/ns-lib.tcl. I'm not sure,
but this code MIGHT require the NOAH extension because that
for {set i 0} { $i [Node set nn_] loop.
--- cut here ---
# Given the node handle, return the haddr, iaddr or ID
proc NOAH_handle2iaddr { handle } {
if { $handle == -1 } {
return -1
}
set iaddr [$handle address?]
return $iaddr
}
#
# Given the node's address in haddr, iaddr or ID, search and return the
handle
# (TODO:) create an array at creation to store these pairs for faster lookup
#
proc NOAH_iaddr2handle { node_iaddr } {
if { $node_iaddr == -1 } {
return -1
}
set ns_ [Simulator instance]
for {set i 0} { $i [Node set nn_]} {incr i} {
set node_handle [$ns_ set Node_($i)]
if {[string compare [NOAH_handle2iaddr $node_handle]
$node_iaddr] == 0} {
return $node_handle
}
}
return -1
}
##
## PROC: returns the handle of a given NODE, by its iaddress
##
## FIXME: assume itf(0), codigo C++ devolve mac dessa interface
##
## this code is used by the disabled ARP (option 2)
proc ARP_find_mobile_iaddr2mac { iaddr } {
set ns_ [Simulator instance]
set MH_node_handle [NOAH_iaddr2handle $iaddr]
set ll [$MH_node_handle set ll_(0)]
#puts found: $MH_node_handle $ll
return $ll
}
--- cut here ---
-
Re: [ns] Disable ARP
Ahmad Khayyat
Wed, 28 Feb 2007 02:27:15 -0800
Never mind.
The two lines work perfectly. They just happened to trigger another
problem, which is taken care of now :)
On Tue, 27 Feb 2007 18:27:37 -0500
Ahmad Khayyat [EMAIL PROTECTED] wrote:
What is the easiest way to disable the use of the ARP protocol?
I guess the IP address corresponds to the MAC address in ns-2, doesn't
it? So how do I make the LL/ARP modules use it immediately without
using ARP?
I tried adding the following two lines at the top of
ARPTable::arpresolve(nsaddr_t dst, Packet *p, LL *ll)
mac_-hdr_dst((char*) HDR_MAC(p), dst);
return 0;
but that caused strange behaviour on rare occasions, where a packet
suddenly would appear in another far node. Playing with ARP doesn't
explain the problem for me, but somehow removing those two lines
gets rid of the strange behaviour. So, what is a proper way of
disabling ARP?
Thanks..
Ahmad
