def test_vtysh():
"""
Checks that the vtysh shell of a host sends a proper reply.
"""
platform = DockerPlatform(None, None)
platform.pre_build()
# Add node
node1 = Node(identifier='switch1', type='openswitch')
switch1 = platform.add_node(node1)
# Add ports
p1 = BidirectionalPort(identifier='p1', label=1)
platform.add_biport(switch1, p1)
p2 = BidirectionalPort(identifier='p2', label=2)
platform.add_biport(switch1, p2)
p3 = BidirectionalPort(identifier='p3', label=3)
platform.add_biport(switch1, p3)
platform.post_build()
reply = switch1('show vlan')
platform.destroy()
assert 'vlan' in reply
def test_vtysh():
"""
Checks that the vtysh shell of a host sends a proper reply.
"""
platform = DockerPlatform(None, None)
platform.pre_build()
# Add node
node1 = Node(identifier='switch1', type='openswitch')
switch1 = platform.add_node(node1)
# Add ports
p1 = BidirectionalPort(identifier='p1', label=1)
platform.add_biport(switch1, p1)
p2 = BidirectionalPort(identifier='p2', label=2)
platform.add_biport(switch1, p2)
p3 = BidirectionalPort(identifier='p3', label=3)
platform.add_biport(switch1, p3)
platform.post_build()
reply = switch1('show vlan')
platform.destroy()
assert 'vlan' in reply
def test_shell():
"""
Checks that both bash shells (default and front_panel) of a host reply
properly.
"""
platform = DockerPlatform(None, None)
platform.pre_build()
# Add node
node1 = Node(identifier='host1', type='host')
host1 = platform.add_node(node1)
# Add ports
p1 = BidirectionalPort(identifier='p1')
platform.add_biport(host1, p1)
p2 = BidirectionalPort(identifier='p2')
platform.add_biport(host1, p2)
p3 = BidirectionalPort(identifier='p3')
platform.add_biport(host1, p3)
platform.post_build()
reply = host1('echo "var"')
reply_front_panel = host1('echo "var"', shell='bash')
platform.destroy()
assert 'var' in reply
assert 'var' in reply_front_panel
def test_docker_network():
"""
Test the docker network used for oobm
Creates a topology with one host. After the node is added (with node_add)
it should be connected to the oobm docker network and the information for
this network should be inspectable by "docker network inspect".
"""
# Build topology
platform = DockerPlatform(None, None)
platform.pre_build()
h1 = Node(identifier='hs1', type='host')
hs1 = platform.add_node(h1)
container_info = hs1._client.inspect_container(hs1._container_name)
network_info = hs1._client.inspect_network(hs1._container_name + '_oobm')
platform.destroy()
container_ids = network_info['Containers'].keys()
assert container_ids
# The container id for hs1 should be in the network's list of containers
assert container_info['Id'] in container_ids
def test_lo_up():
"""
Test that loopback interface in all netns are up
Creates a topology with one host. After the node is added to the topology
it should have one loopback interface per netns (a total of two for this
test) and they should all be in state != DOWN (we can't test for state = UP
because some older kernel versions use UNKNOWN instead of UP for when lo
interfaces are UP)
"""
# Build topology
platform = DockerPlatform(None, None)
platform.pre_build()
h1 = Node(identifier='hs1', type='host')
hs1 = platform.add_node(h1)
result = hs1('ip link list lo', shell='bash')
result_front_panel = hs1('ip link list lo', shell='bash')
platform.destroy()
# FIXME: change to test for 'UP' in result once this becomes the correct
# operstate for lo interfaces in all supported kernels (see comment above)
assert 'DOWN' not in result
assert 'DOWN' not in result_front_panel
def test_shell():
"""
Checks that the bash shell of a host sends a proper reply.
"""
platform = DockerPlatform(None, None)
platform.pre_build()
# Add node
node1 = Node(identifier='host1', type='host')
host1 = platform.add_node(node1)
# Add ports
p1 = BidirectionalPort(identifier='p1')
platform.add_biport(host1, p1)
p2 = BidirectionalPort(identifier='p2')
platform.add_biport(host1, p2)
p3 = BidirectionalPort(identifier='p3')
platform.add_biport(host1, p3)
platform.post_build()
reply = host1('echo "var"')
platform.destroy()
assert 'var' in reply
def test_shell():
"""
Checks that the bash shell of a host sends a proper reply.
"""
platform = DockerPlatform(None, None)
platform.pre_build()
# Add node
node1 = Node(identifier='host1', type='host')
host1 = platform.add_node(node1)
# Add ports
p1 = BidirectionalPort(identifier='p1')
platform.add_biport(host1, p1)
p2 = BidirectionalPort(identifier='p2')
platform.add_biport(host1, p2)
p3 = BidirectionalPort(identifier='p3')
platform.add_biport(host1, p3)
platform.post_build()
reply = host1('echo "var"')
platform.destroy()
assert 'var' in reply
def test_add_port():
"""
Add ports and uses 'ip link list' to check they exist.
"""
platform = DockerPlatform(None, None)
platform.pre_build()
node1 = Node(identifier='host1', type='host')
host1 = platform.add_node(node1)
assert platform.nmlnode_node_map[node1.identifier] is not None
# Add ports
p1 = BidirectionalPort(identifier='p1')
platform.add_biport(node1, p1)
p2 = BidirectionalPort(identifier='p2')
platform.add_biport(node1, p2)
p3 = BidirectionalPort(identifier='p3')
platform.add_biport(node1, p3)
# Add link
link = BidirectionalLink(identifier='link')
platform.add_bilink((node1, p1), (node1, p2), link)
platform.post_build()
result = host1('ip link list')
platform.destroy()
assert 'p1: <BROADCAST,MULTICAST> ' in result
assert 'p2: <BROADCAST,MULTICAST> ' in result
assert 'p3: <BROADCAST,MULTICAST> ' in result
def test_shell():
"""
Checks that both bash shells (default and front_panel) of a host reply
properly.
"""
platform = DockerPlatform(None, None)
platform.pre_build()
# Add node
node1 = Node(identifier='host1', type='host')
host1 = platform.add_node(node1)
# Add ports
p1 = BidirectionalPort(identifier='p1')
platform.add_biport(host1, p1)
p2 = BidirectionalPort(identifier='p2')
platform.add_biport(host1, p2)
p3 = BidirectionalPort(identifier='p3')
platform.add_biport(host1, p3)
platform.post_build()
reply = host1('echo "var"')
reply_front_panel = host1('echo "var"', shell='bash')
platform.destroy()
assert 'var' in reply
assert 'var' in reply_front_panel
def test_lo_up():
"""
Test that loopback interface in all netns are up
Creates a topology with one host. After the node is added to the topology
it should have one loopback interface per netns (a total of two for this
test) and they should all be in state != DOWN (we can't test for state = UP
because some older kernel versions use UNKNOWN instead of UP for when lo
interfaces are UP)
"""
# Build topology
platform = DockerPlatform(None, None)
platform.pre_build()
h1 = Node(identifier='hs1', type='host')
hs1 = platform.add_node(h1)
result = hs1('ip link list lo', shell='bash')
result_front_panel = hs1('ip link list lo', shell='bash')
platform.destroy()
# FIXME: change to test for 'UP' in result once this becomes the correct
# operstate for lo interfaces in all supported kernels (see comment above)
assert 'DOWN' not in result
assert 'DOWN' not in result_front_panel
def test_docker_network():
"""
Test the docker network used for oobm
Creates a topology with one host. After the node is added (with node_add)
it should be connected to the oobm docker network and the information for
this network should be inspectable by "docker network inspect".
"""
# Build topology
platform = DockerPlatform(None, None)
platform.pre_build()
h1 = Node(identifier='hs1', type='host')
hs1 = platform.add_node(h1)
container_info = hs1._client.inspect_container(hs1._container_name)
network_info = hs1._client.inspect_network(hs1._container_name + '_oobm')
platform.destroy()
container_ids = network_info['Containers'].keys()
assert container_ids
# The container id for hs1 should be in the network's list of containers
assert container_info['Id'] in container_ids
def test_add_port():
"""
Add ports and uses 'ip link list' to check they exist.
"""
platform = DockerPlatform(None, None)
platform.pre_build()
node1 = Node(identifier='host1', type='host')
host1 = platform.add_node(node1)
assert platform.nmlnode_node_map[node1.identifier] is not None
# Add ports
p1 = BidirectionalPort(identifier='p1')
platform.add_biport(node1, p1)
p2 = BidirectionalPort(identifier='p2')
platform.add_biport(node1, p2)
p3 = BidirectionalPort(identifier='p3')
platform.add_biport(node1, p3)
# Add link
link = BidirectionalLink(identifier='link')
platform.add_bilink((node1, p1), (node1, p2), link)
platform.post_build()
result = host1('ip link list')
platform.destroy()
assert 'p1: <BROADCAST,MULTICAST> ' in result
assert 'p2: <BROADCAST,MULTICAST> ' in result
assert 'p3: <BROADCAST,MULTICAST> ' in result
def test_build_topology():
"""
Builds (and destroys) a basic topology consisting in one switch and one
host
"""
# Setup which shell to use
shell = 'bash'
platform = DockerPlatform(None, None)
platform.pre_build()
# Create node 1
node1 = Node(identifier='host1', type='host')
host1 = platform.add_node(node1)
assert platform.nmlnode_node_map[node1.identifier] is not None
# Create node 2
node2 = Node(identifier='host2', type='host')
host2 = platform.add_node(node2)
assert platform.nmlnode_node_map[node2.identifier] is not None
# Add a port to node 1
p1 = BidirectionalPort(identifier='p1')
platform.add_biport(node1, p1)
# Add a port to node 2
p2 = BidirectionalPort(identifier='p2')
platform.add_biport(node2, p2)
# Create a link between both ports
link = BidirectionalLink(identifier='link')
platform.add_bilink((node1, p1), (node2, p2), link)
platform.post_build()
# Configure network
host1('ip link set dev p1 up', shell=shell)
host1('ip addr add 10.1.1.1/24 dev p1', shell=shell)
host2('ip link set dev p2 up', shell=shell)
host2('ip addr add 10.1.1.2/24 dev p2', shell=shell)
# Test ping
ping_result = host2('ping -c 1 10.1.1.1', shell=shell)
platform.destroy()
assert '1 packets transmitted, 1 received' in ping_result
def test_build_topology():
"""
Builds (and destroys) a basic topology consisting in one switch and one
host
"""
# Setup which shell to use
shell = 'bash'
platform = DockerPlatform(None, None)
platform.pre_build()
# Create node 1
node1 = Node(identifier='host1', type='host')
host1 = platform.add_node(node1)
assert platform.nmlnode_node_map[node1.identifier] is not None
# Create node 2
node2 = Node(identifier='host2', type='host')
host2 = platform.add_node(node2)
assert platform.nmlnode_node_map[node2.identifier] is not None
# Add a port to node 1
p1 = BidirectionalPort(identifier='p1')
platform.add_biport(node1, p1)
# Add a port to node 2
p2 = BidirectionalPort(identifier='p2')
platform.add_biport(node2, p2)
# Create a link between both ports
link = BidirectionalLink(identifier='link')
platform.add_bilink((node1, p1), (node2, p2), link)
platform.post_build()
# Configure network
host1('ip link set dev p1 up', shell=shell)
host1('ip addr add 10.1.1.1/24 dev p1', shell=shell)
host2('ip link set dev p2 up', shell=shell)
host2('ip addr add 10.1.1.2/24 dev p2', shell=shell)
# Test ping
ping_result = host2('ping -c 1 10.1.1.1', shell=shell)
platform.destroy()
assert '1 packets transmitted, 1 received' in ping_result
def test_add_port():
"""
Add ports and uses 'ip link list' to check they exist.
"""
# Setup which shell to use
shell = 'bash'
platform = DockerPlatform(None, None)
platform.pre_build()
node1 = Node(identifier='host1', type='host')
host1 = platform.add_node(node1)
node2 = Node(identifier='host2', type='host')
host2 = platform.add_node(node2)
assert platform.nmlnode_node_map[node1.identifier] is not None
assert platform.nmlnode_node_map[node2.identifier] is not None
# Add ports
p1 = BidirectionalPort(identifier='p1')
platform.add_biport(node1, p1)
p2 = BidirectionalPort(identifier='p2')
platform.add_biport(node2, p2)
p3 = BidirectionalPort(identifier='p3')
platform.add_biport(node1, p3)
# Add link
link = BidirectionalLink(identifier='link')
platform.add_bilink((node1, p1), (node2, p2), link)
platform.post_build()
result1 = host1('ip link list', shell=shell)
result2 = host2('ip link list', shell=shell)
platform.destroy()
# On newer kernels, ip link list will append the name of the peer
# interface of a veth link after an @, like this: p1@if34
assert search('p1.*: <BROADCAST,MULTICAST> ', result1)
assert search('p2.*: <BROADCAST,MULTICAST> ', result2)
assert 'p3: <BROADCAST,MULTICAST> ' in result1
def test_add_port():
"""
Add ports and uses 'ip link list' to check they exist.
"""
# Setup which shell to use
shell = 'bash'
platform = DockerPlatform(None, None)
platform.pre_build()
node1 = Node(identifier='host1', type='host')
host1 = platform.add_node(node1)
node2 = Node(identifier='host2', type='host')
host2 = platform.add_node(node2)
assert platform.nmlnode_node_map[node1.identifier] is not None
assert platform.nmlnode_node_map[node2.identifier] is not None
# Add ports
p1 = BidirectionalPort(identifier='p1')
platform.add_biport(node1, p1)
p2 = BidirectionalPort(identifier='p2')
platform.add_biport(node2, p2)
p3 = BidirectionalPort(identifier='p3')
platform.add_biport(node1, p3)
# Add link
link = BidirectionalLink(identifier='link')
platform.add_bilink((node1, p1), (node2, p2), link)
platform.post_build()
result1 = host1('ip link list', shell=shell)
result2 = host2('ip link list', shell=shell)
platform.destroy()
# On newer kernels, ip link list will append the name of the peer
# interface of a veth link after an @, like this: p1@if34
assert search('p1.*: <BROADCAST,MULTICAST> ', result1)
assert search('p2.*: <BROADCAST,MULTICAST> ', result2)
assert 'p3: <BROADCAST,MULTICAST> ' in result1
def test_no_duplicate_biport_ids():
with pytest.raises(ValueError):
"""
Builds a topology with a repeated biport identifier and checks that the
correct exception (ValueError) is raised
"""
# Build topology
platform = DockerPlatform(None, None)
platform.pre_build()
h1 = Node(identifier='hs1', type='host')
h2 = Node(identifier='hs2', type='host')
hs1 = platform.add_node(h1)
hs2 = platform.add_node(h2)
s1p1 = BidirectionalPort(identifier='1')
s1p2 = BidirectionalPort(identifier='1')
platform.add_biport(hs1, s1p1)
platform.add_biport(hs2, s1p2)
def test_netns_list():
"""
Test the list of network namespaces
Creates a topology with one host. After the node is added to the topology
it should have one network namespace named "front_panel".
"""
# Build topology
platform = DockerPlatform(None, None)
platform.pre_build()
h1 = Node(identifier='hs1', type='host')
hs1 = platform.add_node(h1)
result = hs1('ip netns list', shell='bash')
platform.destroy()
assert 'front_panel' in result
# Test that an another network namespace is not in the list
assert '\n' not in result
def test_netns_list():
"""
Test the list of network namespaces
Creates a topology with one host. After the node is added to the topology
it should have one network namespace named "front_panel".
"""
# Build topology
platform = DockerPlatform(None, None)
platform.pre_build()
h1 = Node(identifier='hs1', type='host')
hs1 = platform.add_node(h1)
result = hs1('ip netns list', shell='bash')
platform.destroy()
assert 'front_panel' in result
# Test that an another network namespace is not in the list
assert '\n' not in result
def test_ping_openvswitch():
"""
Builds the topology described on the following schema and ping h2 from h1.
::
+------+ +------+
| | +------+ +------+ | |
| h1 <-----> s1 <-----> s2 <-----> h2 |
| | +------+ +------+ | |
+------+ +------+
"""
# Build topology
platform = DockerPlatform(None, None)
platform.pre_build()
h1 = Node(identifier='hs1', type='host')
h2 = Node(identifier='hs2', type='host')
s1 = Node(identifier='sw1', type='openvswitch')
s2 = Node(identifier='sw2', type='openvswitch')
hs1 = platform.add_node(h1)
hs2 = platform.add_node(h2)
sw1 = platform.add_node(s1)
sw2 = platform.add_node(s2)
s1p1 = BidirectionalPort(identifier='sw1-3')
s1p2 = BidirectionalPort(identifier='sw1-4')
platform.add_biport(s1, s1p1)
platform.add_biport(s1, s1p2)
s2p1 = BidirectionalPort(identifier='sw2-3')
s2p2 = BidirectionalPort(identifier='sw2-4')
platform.add_biport(s2, s2p1)
platform.add_biport(s2, s2p2)
h1p1 = BidirectionalPort(identifier='hs1-1')
h2p1 = BidirectionalPort(identifier='hs2-1')
platform.add_biport(h1, h1p1)
platform.add_biport(h2, h2p1)
link1 = BidirectionalLink(identifier='link1')
platform.add_bilink((s1, s1p1), (h1, h1p1), link1)
link2 = BidirectionalLink(identifier='link2')
platform.add_bilink((s1, s1p2), (s2, s2p1), link2)
link3 = BidirectionalLink(identifier='link3')
platform.add_bilink((s2, s2p2), (h2, h2p1), link3)
platform.post_build()
# Ping test
###########
# Configure IP and bring UP host 1 interfaces
commands = """
ip link set hs1-1 up
ip addr add 10.0.10.1/24 dev hs1-1
ip route add default via 10.0.10.2
"""
hs1.libs.common.assert_batch(commands)
# Configure IP and bring UP host 2 interfaces
commands = """
ip link set hs2-1 up
ip addr add 10.0.30.1/24 dev hs2-1
ip route add default via 10.0.30.2
"""
hs2.libs.common.assert_batch(commands)
# Configure IP and bring UP switch 1 interfaces
commands = """
ip link set sw1-3 up
ip link set sw1-4 up
ip addr add 10.0.10.2/24 dev sw1-3
ip addr add 10.0.20.1/24 dev sw1-4
ip route add 10.0.30.0/24 via 10.0.20.2
"""
sw1.libs.common.assert_batch(commands)
# Configure IP and bring UP switch 2 interfaces
commands = """
ip link set sw2-3 up
ip link set sw2-4 up
ip addr add 10.0.20.2/24 dev sw2-3
ip addr add 10.0.30.2/24 dev sw2-4
ip route add 10.0.10.0/24 via 10.0.20.1
"""
sw2.libs.common.assert_batch(commands)
ping_result = hs1.send_command('ping -c 1 10.0.30.1')
platform.destroy()
assert '1 packets transmitted, 1 received' in ping_result
def test_ping():
"""
Builds the topology described on the following schema and ping h2 from h1.
::
+------+ +------+
| | +------+ +------+ | |
| h1 <-----> s1 <-----> s2 <-----> h2 |
| | +------+ +------+ | |
+------+ +------+
"""
# Setup which shell to use
shell = 'bash'
# Build topology
platform = DockerPlatform(None, None)
platform.pre_build()
h1 = Node(identifier='hs1', type='host')
h2 = Node(identifier='hs2', type='host')
s1 = Node(identifier='sw1', type='host')
s2 = Node(identifier='sw2', type='host')
hs1 = platform.add_node(h1)
hs2 = platform.add_node(h2)
sw1 = platform.add_node(s1)
sw2 = platform.add_node(s2)
s1p1 = BidirectionalPort(identifier='sw1-3')
s1p2 = BidirectionalPort(identifier='sw1-4')
platform.add_biport(s1, s1p1)
platform.add_biport(s1, s1p2)
s2p1 = BidirectionalPort(identifier='sw2-3')
s2p2 = BidirectionalPort(identifier='sw2-4')
platform.add_biport(s2, s2p1)
platform.add_biport(s2, s2p2)
h1p1 = BidirectionalPort(identifier='hs1-1')
h2p1 = BidirectionalPort(identifier='hs2-1')
platform.add_biport(h1, h1p1)
platform.add_biport(h2, h2p1)
link1 = BidirectionalLink(identifier='link1')
platform.add_bilink((s1, s1p1), (h1, h1p1), link1)
link2 = BidirectionalLink(identifier='link2')
platform.add_bilink((s1, s1p2), (s2, s2p1), link2)
link3 = BidirectionalLink(identifier='link3')
platform.add_bilink((s2, s2p2), (h2, h2p1), link3)
platform.post_build()
# Ping test
###########
# Configure IP and bring UP host 1 interfaces
hs1('ip link set dev hs1-1 up', shell=shell)
hs1('ip addr add 10.0.10.1/24 dev hs1-1', shell=shell)
# Configure IP and bring UP host 2 interfaces
hs2('ip link set dev hs2-1 up', shell=shell)
hs2('ip addr add 10.0.30.1/24 dev hs2-1', shell=shell)
# Configure IP and bring UP switch 1 interfaces
sw1('ip link set dev sw1-3 up', shell=shell)
sw1('ip link set dev sw1-4 up', shell=shell)
sw1('ip addr add 10.0.10.2/24 dev sw1-3', shell=shell)
sw1('ip addr add 10.0.20.1/24 dev sw1-4', shell=shell)
# Configure IP and bring UP switch 2 interfaces
sw2('ip link set dev sw2-3 up', shell=shell)
sw2('ip addr add 10.0.20.2/24 dev sw2-3', shell=shell)
sw2('ip link set dev sw2-4 up', shell=shell)
sw2('ip addr add 10.0.30.2/24 dev sw2-4', shell=shell)
# Set static routes in switches
sw1('ip route add 10.0.30.0/24 via 10.0.20.2', shell=shell)
sw2('ip route add 10.0.10.0/24 via 10.0.20.1', shell=shell)
# Set gateway in hosts
hs1('ip route add default via 10.0.10.2', shell=shell)
hs2('ip route add default via 10.0.30.2', shell=shell)
ping_result = hs1('ping -c 1 10.0.30.1', shell=shell)
platform.destroy()
assert '1 packets transmitted, 1 received' in ping_result
def test_ping():
"""
Builds the topology described on the following schema and ping h2 from h1.
::
+------+ +------+
| | +------+ +------+ | |
| h1 <-----> s1 <-----> s2 <-----> h2 |
| | +------+ +------+ | |
+------+ +------+
"""
# Build topology
platform = DockerPlatform(None, None)
platform.pre_build()
h1 = Node(identifier='hs1', type='host')
h2 = Node(identifier='hs2', type='host')
s1 = Node(identifier='sw1', type='host')
s2 = Node(identifier='sw2', type='host')
hs1 = platform.add_node(h1)
hs2 = platform.add_node(h2)
sw1 = platform.add_node(s1)
sw2 = platform.add_node(s2)
s1p1 = BidirectionalPort(identifier='3')
s1p2 = BidirectionalPort(identifier='4')
platform.add_biport(s1, s1p1)
platform.add_biport(s1, s1p2)
s2p1 = BidirectionalPort(identifier='3')
s2p2 = BidirectionalPort(identifier='4')
platform.add_biport(s2, s2p1)
platform.add_biport(s2, s2p2)
h1p1 = BidirectionalPort(identifier='hs1-1')
h2p1 = BidirectionalPort(identifier='hs2-1')
platform.add_biport(h1, h1p1)
platform.add_biport(h2, h2p1)
link1 = BidirectionalLink(identifier='link1')
platform.add_bilink((s1, s1p1), (h1, h1p1), link1)
link2 = BidirectionalLink(identifier='link2')
platform.add_bilink((s1, s1p2), (s2, s2p1), link2)
link3 = BidirectionalLink(identifier='link3')
platform.add_bilink((s2, s2p2), (h2, h2p1), link3)
platform.post_build()
# Ping test
###########
# Configure IP and bring UP host 1 interfaces
hs1('ip link set dev hs1-1 up')
hs1('ip addr add 10.0.10.1/24 dev hs1-1')
# Configure IP and bring UP host 2 interfaces
hs2('ip link set dev hs2-1 up')
hs2('ip addr add 10.0.30.1/24 dev hs2-1')
# Configure IP and bring UP switch 1 interfaces
sw1('ip link set dev 3 up')
sw1('ip link set dev 4 up')
sw1('ip addr add 10.0.10.2/24 dev 3')
sw1('ip addr add 10.0.20.1/24 dev 4')
# Configure IP and bring UP switch 2 interfaces
sw2('ip link set dev 3 up')
sw2('ip addr add 10.0.20.2/24 dev 3')
sw2('ip link set dev 4 up')
sw2('ip addr add 10.0.30.2/24 dev 4')
# Set static routes in switches
sw1('ip route add 10.0.30.0/24 via 10.0.20.2')
sw2('ip route add 10.0.10.0/24 via 10.0.20.1')
# Set gateway in hosts
hs1('ip route add default via 10.0.10.2')
hs2('ip route add default via 10.0.30.2')
ping_result = hs1('ping -c 1 10.0.30.1')
platform.destroy()
assert '1 packets transmitted, 1 received' in ping_result