def network_alt(env):
simpynet.PointToPoint.unique_number=0
simpynet.Switch.unique_number=0
h0 = simpynet.Host(env , simpynet.Mac("00.00.00.00.00") , simpynet.IP("192.0.0.0"))
h1 = simpynet.Host(env , simpynet.Mac("00.00.00.00.01") , simpynet.IP("192.0.0.1"))
link0 = simpynet.PointToPoint(env, lambda x,y:PROPAGATION_DELAY, lambda src,trg,l: TRANSMISSION_DELAY)
link1 = simpynet.PointToPoint(env, lambda x,y:PROPAGATION_DELAY, lambda src,trg,l: TRANSMISSION_DELAY)
switch = simpynet.Switch( env, lambda x, y : PROCESSING_DELAY )
simpynet.physical.plug(link0,h0)
simpynet.physical.plug(link0,switch)
simpynet.physical.plug(link1,switch)
simpynet.physical.plug(link1,h1)
env.add_collector_functions( 'received_frames', switch.collector_receivedframes , TIME_INCREMENT )
env.add_collector_functions( 'sent_frames', switch.collector_sentframes , TIME_INCREMENT )
protocol0 = selective_repeat.Selective_Repeat( env, 10 )
protocol0.timeout_time = 30
protocol1 = selective_repeat.Selective_Repeat( env, 10 )
protocol1.timeout_time = 30
protocol0.add_handler( h0.add_transport_handler( protocol0.get_handler() ) )
protocol1.add_handler( h1.add_transport_handler( protocol1.get_handler() ) )
protocol0.send( NUMBER_OF_PACKETS , simpynet.IP("192.0.0.1") )
def network(env):
simpynet.PointToPoint.unique_number=0
simpynet.Switch.unique_number=0
h0 = simpynet.Host(env , simpynet.Mac("00.00.00.00.00") , simpynet.IP("192.0.0.0"))
h1 = simpynet.Host(env , simpynet.Mac("00.00.00.00.01") , simpynet.IP("192.0.0.1"))
link0 = simpynet.PointToPoint(env, lambda x,y:PROPAGATION_DELAY, lambda src,trg,l: TRANSMISSION_DELAY)
link1 = simpynet.PointToPoint(env, lambda x,y:PROPAGATION_DELAY, lambda src,trg,l: TRANSMISSION_DELAY)
switch = simpynet.Switch( env, lambda x, y : PROCESSING_DELAY )
tc = TimeCollector(env)
tc.reset()
simpynet.physical.plug(link0,h0)
tc.add_handlers( switch , link0 )
tc.add_handlers( switch , link1 )
simpynet.physical.plug(link1,h1)
env.add_collector_functions( 'data', tc.collector , float('inf') )
protocol0 = selective_repeat.Selective_Repeat( env, 10 )
protocol0.timeout_time = 30
protocol1 = selective_repeat.Selective_Repeat( env, 10 )
protocol1.timeout_time = 30
protocol0.add_handler( h0.add_transport_handler( protocol0.get_handler() ) )
protocol1.add_handler( h1.add_transport_handler( protocol1.get_handler() ) )
protocol0.send( NUMBER_OF_PACKETS , simpynet.IP("192.0.0.1") )
def frw(datagram, mac):
print mac
if mac == spn.Mac('88:B2:2F:54:1A:0F'):
print 'forwanding'
return spn.Mac('5C:66:AB:90:75:B1')
else:
print 'no fornarding'
def example1(env):
"""
Example at the link level.
h1----l1----| r1 |---l2----h2
"""
h1 = spn.Host(env, spn.Mac("00.00.00.00.00"), spn.IP("192.0.0.0"))
h2 = spn.Host(env, spn.Mac("00.00.00.00.01"), spn.IP("192.0.0.1"))
l1 = spn.Link(env, lambda x, y: 3, lambda src, trg, l: 1)
l2 = spn.Link(env, lambda x, y: 3, lambda src, trg, l: 1)
def host_handler(data):
print data
def forwarding(datagram, src_mac):
if datagram.dst_ip == spn.IP("192.0.0.0"):
return spn.Mac("00.00.00.00.00")
else:
return spn.Mac("00.00.00.00.01")
r1 = spn.Router(env, spn.Mac("00.00.00.00.02"), forwarding,
lambda x, y: 0.1)
spn.physical.plug(l1, r1)
spn.physical.plug(l2, r1)
spn.physical.plug(l1, h1)
spn.physical.plug(l2, h2)
send1 = h1.add_transport_handler(host_handler)
send2 = h2.add_transport_handler(host_handler)
def funct():
yield env.timeout(0)
send1("Ciao inviato da host 1", spn.IP("192.0.0.1"))
def funct2():
yield env.timeout(1)
yield env.timeout(10)
send2("Ciao inviato da host 2", spn.IP("192.0.0.0"))
r_r = r1.collector_receiveddatagrams
r_s = r1.collector_sentdatagrams
r_t = r1.collector_processingtime
h2_r = h2.collector_receiveddatagrams
h1_s = h1.collector_sentdatagrams
env.add_collector_functions('router received', r_r, 1)
env.add_collector_functions('router sent', r_s, 2)
env.add_collector_functions('router proc. time', r_t, 1)
env.add_collector_functions('h2 received', h2_r, 1)
env.add_collector_functions('h1 sent', h1_s, 1)
env.process(funct())
env.process(funct2())
def forwarding(datagram, router):
if datagram.dst_ip == simpynet.IP("192.0.0.0"):
return simpynet.Mac("00.00.00.00.00")
if datagram.dst_ip == simpynet.IP("192.0.0.1"):
return simpynet.Mac("00.00.00.00.01")
if datagram.dst_ip == simpynet.IP("192.0.0.50"):
return simpynet.Mac("00.00.00.00.02")
if datagram.dst_ip == simpynet.IP("192.0.0.80"):
return simpynet.Mac("00.00.00.00.03")
else:
return None
def _forwarding(self, name, data, d_trm_delay):
"""
Simulates the forwarding process.
The data is processed and put to the appropriate output buffer.
"""
with self.switch_resource.request() as req:
yield req
temp_time = float(self.env.now)
yield self.env.timeout(self.prcss_delay(data, repr(self)))
src_mac = repr(data.src_mac)
for mac in self.arp_table:
if self.arp_table[mac] == name:
del self.arp_table[mac]
break
self.arp_table[repr(
src_mac
)] = name # si aggiunge all'arp table il riferimento mac-interface
self.queues[name][0] -= len(data)
if ((data.dst_mac == self.mac or data.dst_mac == simpynet.Mac())
and data.datagram.ttl > 0):
datagram = data.datagram
datagram.ttl -= 1
dst_mac = self.forwarding(datagram, repr(self))
data = simpynet.Frame(self.mac, dst_mac, datagram)
if self.arp_table.has_key(repr(dst_mac)):
self.env.process(
self._deliver(self.arp_table[repr(dst_mac)], data,
d_trm_delay))
else:
self.env.process(self._broadcast(name, data, d_trm_delay))
self.processing_time += float(self.env.now) - temp_time
def sr_network(env):
h0 = simpynet.Host(env, simpynet.Mac("00.00.00.00.00"),
simpynet.IP("192.0.0.0"))
h1 = simpynet.Host(env, simpynet.Mac("00.00.00.00.01"),
simpynet.IP("192.0.0.1"))
link = simpynet.PointToPoint(env, lambda x, y: PROPAGATION_DELAY,
lambda src, trg, l: PROPAGATION_DELAY,
lambda src, trg, l: LOSS_PROBABILITY)
simpynet.physical.plug(link, h0)
simpynet.physical.plug(link, h1)
protocol0 = Selective_Repeat(env, 10)
protocol1 = Selective_Repeat(env, 10)
protocol0.add_handler(h0.add_transport_handler(protocol0.get_handler()))
protocol1.add_handler(h1.add_transport_handler(protocol1.get_handler()))
protocol0.send(NUMBER_OF_PACKETS, simpynet.IP("192.0.0.1"))
def example(env):
"""
dhcp_client------l1------dhcp_server
"""
# --------------------------------------------------------
c_host = spn.Host(env, spn.Mac('aa.aa.aa.aa.aa.aa'), spn.IP('0.0.0.0'))
s_host = spn.Host(env, spn.Mac('bb.bb.bb.bb.bb.bb'), spn.IP('192.168.1.1'))
client = spn.DHCP_client(env, c_host)
server = spn.DHCP_server(env, s_host)
def choose_ip_server(lista_ip):
if len(lista_ip) > 0:
return lista_ip.pop(0)
else:
return None
def choose_ip_for_client():
return '123'
server.add_function_choose(choose_ip_for_client)
client.add_function_choose(choose_ip_server)
l1 = spn.Link(env, lambda x, y: 1, lambda src, trg, l: 1)
spn.physical.plug(l1, c_host)
spn.physical.plug(l1, s_host)
def funct():
yield env.timeout(1)
client.send_DHCP_DISCOVERED()
env.process(funct())
def __init__(self, environment, mac_addr, ip_addr):
simpynet.link.nic.NIC.__init__(self, environment, mac_addr)
self.ip_addr = ip_addr
self.host_handler = self._receive_host
self.transport_handler = []
self.discarded_datagrams = 0
self.sent_datagrams = 0
self.received_datagrams = 0
self.corrupted_datagrams = 0
self.default_gateway = simpynet.Mac()
def example2(env):
""""
example figure 5.17 p. 492 (Computer Networking, 6th edition, Kurose-Ross).
c----l1-----|
|
b----l2--- |so|---l4---ro
|
a----l3-----|
"""
env = spn.Environment()
host_c = spn.Host(env, spn.Mac('1A:23:F9:CD:06:9B'),
spn.IP('222.222.222.220'))
host_b = spn.Host(env, spn.Mac('5C:66:AB:90:75:B1'),
spn.IP('222.222.222.221'))
host_a = spn.Host(env, spn.Mac('49:BD:D2:C7:56:2A'),
spn.IP('222.222.222.222'))
l1 = spn.Link(env,
trm_delay=lambda name, data: 1,
prg_delay=lambda s, r, l: 1)
l2 = spn.Link(env,
trm_delay=lambda name, data: 1,
prg_delay=lambda s, r, l: 1)
l3 = spn.Link(env,
trm_delay=lambda name, data: 1,
prg_delay=lambda s, r, l: 1)
l4 = spn.Link(env,
trm_delay=lambda name, data: 1,
prg_delay=lambda s, r, l: 1)
s0 = spn.Switch(env)
def frw(datagram, mac):
print mac
if mac == spn.Mac('88:B2:2F:54:1A:0F'):
print 'forwanding'
return spn.Mac('5C:66:AB:90:75:B1')
else:
print 'no fornarding'
r0 = spn.Router(env, spn.Mac('88:B2:2F:54:1A:0F'), frw)
spn.physical.plug(host_c, l1)
spn.physical.plug(l1, s0)
spn.physical.plug(host_b, l2)
spn.physical.plug(l2, s0)
spn.physical.plug(host_a, l3)
spn.physical.plug(l3, s0)
spn.physical.plug(r0, l4)
spn.physical.plug(l4, r0)
def tcp_handler(segment):
print 'attivato tcp'
def h_receiver(name, data, trm_delay): # receiver' s handler
def _new_handler(name, data, trm_delay):
yield env.timeout(trm_delay)
return env.process(_new_handler(name, data, trm_delay))
f_send = host_c.add_transport_handler(tcp_handler)
host_b.add_handler('rcv', h_receiver)
def rcv_r():
pass
host_c.default_gateway = spn.Mac('88:B2:2F:54:1A:0F')
def sender():
yield env.timeout(0)
f_send('ciao da host 1', spn.IP('222.222.222.220'))
env.process(sender())
def forwarding(datagram, src_mac):
if datagram.dst_ip == spn.IP("192.0.0.0"):
return spn.Mac("00.00.00.00.00")
else:
return spn.Mac("00.00.00.00.01")
def network(env):
domains = {
"moogle.com": simpynet.IP("192.0.0.50"),
"mybank.com": simpynet.IP("192.0.0.80")
}
def dns_function(name):
if domains.has_key(name):
return domains[name]
else:
return None
def sender(env):
client.send("Hello", "moogle.com")
yield env.timeout(5)
client.send("Hello", "mybank.com")
yield env.timeout(5)
client.send("Hello", "random.com")
client.send("Hello again", "moogle.com")
def forwarding(datagram, router):
if datagram.dst_ip == simpynet.IP("192.0.0.0"):
return simpynet.Mac("00.00.00.00.00")
if datagram.dst_ip == simpynet.IP("192.0.0.1"):
return simpynet.Mac("00.00.00.00.01")
if datagram.dst_ip == simpynet.IP("192.0.0.50"):
return simpynet.Mac("00.00.00.00.02")
if datagram.dst_ip == simpynet.IP("192.0.0.80"):
return simpynet.Mac("00.00.00.00.03")
else:
return None
router = simpynet.Router(env, simpynet.Mac("00.00.00.00.10"), forwarding,
lambda x, y: PROCESSING_DELAY)
host = simpynet.Host(env, simpynet.Mac("00.00.00.00.00"),
simpynet.IP("192.0.0.0"))
dns_host = simpynet.Host(env, simpynet.Mac("00.00.00.00.01"),
simpynet.IP("192.0.0.1"))
server_host0 = simpynet.Host(env, simpynet.Mac("00.00.00.00.02"),
simpynet.IP("192.0.0.50"))
server_host1 = simpynet.Host(env, simpynet.Mac("00.00.00.00.03"),
simpynet.IP("192.0.0.80"))
host.set_default_gateway(simpynet.Mac("00.00.00.00.10"))
dns_host.set_default_gateway(simpynet.Mac("00.00.00.00.10"))
server_host0.set_default_gateway(simpynet.Mac("00.00.00.00.10"))
server_host1.set_default_gateway(simpynet.Mac("00.00.00.00.10"))
client = Client(env, host, dns_host.ip_addr)
dns = DNS_Server(env, dns_host, dns_function)
moogle = Server(env, server_host0, "moogle.com")
mybank = Server(env, server_host1, "mybank.com")
link0 = simpynet.PointToPoint(env, lambda x, y: PROPAGATION_DELAY,
lambda src, trg, l: PROPAGATION_DELAY)
link1 = simpynet.PointToPoint(env, lambda x, y: PROPAGATION_DELAY,
lambda src, trg, l: PROPAGATION_DELAY)
link2 = simpynet.PointToPoint(env, lambda x, y: PROPAGATION_DELAY,
lambda src, trg, l: PROPAGATION_DELAY)
link3 = simpynet.PointToPoint(env, lambda x, y: PROPAGATION_DELAY,
lambda src, trg, l: PROPAGATION_DELAY)
simpynet.physical.plug(link0, host)
simpynet.physical.plug(link0, router)
simpynet.physical.plug(link1, dns_host)
simpynet.physical.plug(link1, router)
simpynet.physical.plug(link2, server_host0)
simpynet.physical.plug(link2, router)
simpynet.physical.plug(link3, server_host1)
simpynet.physical.plug(link3, router)
env.process(sender(env))
