TCP socket support for NS2

[Hitesh Khandelwal]

I want to have TCP socket support for NS2. On searching I came across
gnutella project which implemented TCP sockets for NS2. (
http://www.cc.gatech.edu/computing/compass/gnutella/install.html). I
followed the instructions given on the page and recompiled NS2 successfully.
But when I tried to compile the test program given
http://www.cc.gatech.edu/computing/compass/gnutella/socket.tcl I got the
following error:

------------------------------
---------------------------------------------------------
$ ns socket.tcl

    (_o3 cmd line 1)
    invoked from within
"_o3 cmd create-sock 0 _o28 6346"
    invoked from within
"catch "$self cmd $args" ret"
    invoked from within
"if [catch "$self cmd $args" ret] {
set cls [$self info class]
global errorInfo
set savedInfo $errorInfo
error "error when calling class $cls: $args" $..."
    (procedure "_o3" line 2)
    (SplitObject unknown line 2)
    invoked from within
"$ns create-sock $id0 $srv 6346"
    invoked from within
"set ssock [$ns create-sock $id0 $srv 6346]"
    (file "socket.tcl" line 8)
---------------------------------------------------------------------------------------

Has anyone else also faced the same problem? Please help me to sort this
problem. (NS2 version 2.31)
Is there any other code available for TCP socket support for NS2 ?
Thanks in advance.

Hitesh Khandelwal
IIT Kanpur, INDIA

[Eclipse612 ()]

Hitesh Khandelwal wrote:

I want to have TCP socket support for NS2. On searching I came across
gnutella project which implemented TCP sockets for NS2. (
http://www.cc.gatech.edu/computing/compass/gnutella/install.html). I
followed the instructions given on the page and recompiled NS2 successfully.
But when I tried to compile the test program given
http://www.cc.gatech.edu/computing/compass/gnutella/socket.tcl I got the
following error:

------------------------------
---------------------------------------------------------
$ ns socket.tcl

    (_o3 cmd line 1)
    invoked from within
"_o3 cmd create-sock 0 _o28 6346"
    invoked from within
"catch "$self cmd $args" ret"
    invoked from within
"if [catch "$self cmd $args" ret] {
set cls [$self info class]
global errorInfo
set savedInfo $errorInfo
error "error when calling class $cls: $args" $..."
    (procedure "_o3" line 2)
    (SplitObject unknown line 2)
    invoked from within
"$ns create-sock $id0 $srv 6346"
    invoked from within
"set ssock [$ns create-sock $id0 $srv 6346]"
    (file "socket.tcl" line 8)
---------------------------------------------------------------------------------------

Has anyone else also faced the same problem? Please help me to sort this
problem. (NS2 version 2.31)
Is there any other code available for TCP socket support for NS2 ?
Thanks in advance.

Hitesh Khandelwal
IIT Kanpur, INDIA

I ran into a similar error and realized there are a couple of wrong calls to TCL procedures that cause the code to return errors. I guess it's old procedures that have changed names since the code was released.

Anyway, I avoided those errors by making the following changes to ns-gnutella.tcl:

-Substitute  $node bind $tagent $port
 With          $node attach $tagent $port

-Substitute   set port_ [$node bind $tagent 0]
 With           set port_ [$node attach $tagent 0]

-Substitute set bip [$lagent myipaddr]
                set bport [$lagent myport]

 With         set bip [$lagent addr]
                set bport [$lagent port]


This way I got the script to overcome that error. Anyway, many other issues open after this. If someone has experience in using the Tcp Socket code, please answer. I need to get this working and it looks like nobody is supporting the code right now.