dound / vns

Virtual Network System for teaching and experimentation

VNS

VNS is the easiest way to give students hands-on experience with networking internals. With VNS, students write software that interacts with their own topology of routers and servers using real-world services and protocols.

VNS is an open-source project available free of charge to students, instructors, and researchers. It is supported by staff and students at Stanford University. Assignments include a variety of tools, including student stub code, grading scripts, and reference solutions. With assignments possible in any language that supports standard sockets, VNS projects can be as small or as large as your students’ imaginations.

Please see the VNS Homepage for more information about VNS.

This repository contains the VNS simulator, VNS web interface, and a command-line client for altering and interacting with topologies while they are running.

Installation

Instructions for installing and running your own VNS simulator are not yet available. If you are interested, please contact David Underhill.

Author: David Underhill
Original Implementation: Martin Casado
License: Apache License Version 2.0

vns's Issues

Build error in sr source code on ubuntu 10.04

When building the sr router from
http://nsl.cs.sfu.ca/teaching/11/771/projects/router/sr_stub.tar.gz

c@d:~/471/a2/stub$ make sr
gcc -c -g -Wall -ansi -D_DEBUG_ -D_LINUX_ sr_router.c -o sr_router.o
gcc -c -g -Wall -ansi -D_DEBUG_ -D_LINUX_ sr_main.c -o sr_main.o
gcc -c -g -Wall -ansi -D_DEBUG_ -D_LINUX_ sr_if.c -o sr_if.o
gcc -c -g -Wall -ansi -D_DEBUG_ -D_LINUX_ sr_rt.c -o sr_rt.o
gcc -c -g -Wall -ansi -D_DEBUG_ -D_LINUX_ sr_vns_comm.c -o sr_vns_comm.o
sr_vns_comm.c: In function ‘sr_connect_to_server’:
sr_vns_comm.c:109: error: ‘struct hostent’ has no member named ‘h_addr’
make: *** [sr_vns_comm.o] Error 1

This can be fixed as described in the gethostent man page by adding

define h_addr h_addr_list[0]

to the sr_vns_comm.c file

broken error handling in views_topology.py

Lines 43 and 59 of vns/AddressAllocation.py return errors incorrectly, causing python to error out when the return value is unpacked on line 64 of vns/web/vnswww/views_topology.py.