= GENI Network Stitching Example =

This page used gcf 2.4 preview 7 to show an example experiment that creates a network stitching path between the GPO InstaGENI and the Utah InstaGENI racks. 


<<Insert Image>>

The experiment uses [http://groups.geni.net/geni/wiki/GeniClearinghouse GENI Clearinghouse] credentials with the omni tool named ''stitcher.py''.  GENI network stitching does not require any special configuration. If you haven't already configured Omni, please follow [http://trac.gpolab.bbn.com/gcf/wiki/OmniConfigure/Automatic these configuration instructions]. 

== Design the Stitching Experiment ==

{{{
#!html
<img src="http://groups.geni.net/geni/attachment/wiki/GENIExperimenter/Tutorials/Graphics/design.png?format=raw" alt="Design/Setup"></a>
}}}

At this time GENI network stitching is supported by several aggregate, this example shows a simple stitching scenario with one server VM in the GPO InstaGENI rack and one VM client in the Utah InstaGENI rack that are connected with a link.  The server-gpo host is configured to be both a Web Server and an Iperf server, also a routable IP address is requested to access the web server. All this is captured in the request RSpec used for this experiment:

Assemble a Request Rspec that includes one VM at each rack site:
{{{
<?xml version="1.0" encoding="UTF-8"?>
<rspec type="request" 
	xmlns="http://www.geni.net/resources/rspec/3" 
	xmlns:planetlab="http://www.planet-lab.org/resources/sfa/ext/planetlab/1" 
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
       xmlns:stitch="http://hpn.east.isi.edu/rspec/ext/stitch/0.1/" 
	xsi:schemaLocation="http://www.geni.net/resources/rspec/3 
	http://www.geni.net/resources/rspec/3/request.xsd">  
  <node client_id="server-gpo" component_manager_id="urn:publicid:IDN+instageni.gpolab.bbn.com+authority+cm" exclusive="false">
    <sliver_type name="emulab-openvz"/>
    <services>
      <execute command="sudo /local/install-script.sh" shell="sh"/>
      <install install_path="/local" url="http://www.gpolab.bbn.com/~lnevers/StitchDemo.tar.gz"/>
   </services>
    <emulab:routable_control_ip xmlns:emulab="http://www.protogeni.net/resources/rspec/ext/emulab/1"/>
    <interface client_id="server-gpo:if0">
      <ip address="192.168.4.1" netmask="255.255.255.0" type="ipv4"/>
    </interface>
  </node>
  <node client_id="client-utah" component_manager_id="urn:publicid:IDN+utah.geniracks.net+authority+cm" exclusive="false">
    <sliver_type name="emulab-openvz"/>
   <services>
      <execute command="sudo /local/install-script.sh" shell="sh"/>
      <install install_path="/local" url="http://www.gpolab.bbn.com/~lnevers/StitchDemo.tar.gz"/>
    </services>
    <interface client_id="client-utah:if0">
      <ip address="192.168.4.2" netmask="255.255.255.0" type="ipv4"/>
    </interface>
  </node>
  <link client_id="link">
    <component_manager name="urn:publicid:IDN+instageni.gpolab.bbn.com+authority+cm"/>
    <component_manager name="urn:publicid:IDN+utah.geniracks.net+authority+cm"/>
    <interface_ref client_id="server-gpo:if0"/>
    <interface_ref client_id="client-utah:if0"/>
    <property source_id="server-gpo:if0" dest_id="client-utah:if0" capacity="100000"/>
    <property source_id="client-utah:if0" dest_id="server-gpo:if0" capacity="100000"/>
  </link>
</rspec>
}}}
In the above RSpec, the link information in the ''component_manager name'' is used by the stitcher.py script to contact the GENI Stitching Computation Service and determine a path between the end-point.


== Execute the Stitching experiment ==
{{{
#!html
<img src="http://groups.geni.net/geni/attachment/wiki/GENIExperimenter/Tutorials/Graphics/execute.png?format=raw" alt="Execute"></a>
}}}

First create a slice for the experiment:
{{{
$ omni.py createslice ig-gpo-ig-utah
21:19:10 INFO     omni: Loading config file /home/lnevers/.gcf/omni_config
21:19:10 INFO     omni: Using control framework portal
21:19:11 INFO     omni: Created slice with Name ig-gpo-ig-utah, URN urn:publicid:IDN+ch.geni.net:ln-prj+slice+ig-gpo-ig-utah, Expiration 2013-07-25 00:00:00
21:19:11 INFO     omni:  ------------------------------------------------------------
21:19:11 INFO     omni:  Completed createslice:

  Options as run:
		framework: portal
		project: ln-prj

  Args: createslice ig-gpo-ig-utah

  Result Summary: Created slice with Name ig-gpo-ig-utah, URN urn:publicid:IDN+ch.geni.net:ln-prj+slice+ig-gpo-ig-utah, Expiration 2013-07-25 00:00:00
21:19:11 INFO     omni:  ============================================================
}}}

A sliver that included a stitched VLAN path can be created using the ''stitcher.py'' script. There is no need to specify the ''-a'' aggregate option, aggregates are determined from the RSpec and need not be specified. Also note that a file is created in the directory where the sliver is created that capture the aggregates associated with the slice.  Following is the stitcher operation that setup up all slivers:
{{{
$ stitcher.py createsliver ig-gpo-ig-utah stitch-ig-gpo-ig-utah.rspec -o
21:28:50 INFO     stitcher: Loading config file /home/lnevers/.gcf/omni_config
21:28:50 INFO     stitcher: Using control framework portal
21:28:50 INFO     stitcher: Checking that slice ig-gpo-ig-utah is valid...             <<==(1)
21:28:51 INFO     stitcher: Slice urn:publicid:IDN+ch.geni.net:ln-prj+slice+ig-gpo-ig-utah expires on 2013-07-25 00:00:00 UTC 
21:28:52 INFO     stitcher: <Aggregate urn:publicid:IDN+utah.geniracks.net+authority+cm> speaks AM API v3, but sticking with v2  <==(2)
21:28:52 INFO     stitcher: <Aggregate urn:publicid:IDN+instageni.gpolab.bbn.com+authority+cm> speaks AM API v3, but sticking with v2
21:28:52 INFO     stitcher: <Aggregate urn:publicid:IDN+emulab.net+authority+cm> speaks AM API v3, but sticking with v2
21:28:52 INFO     stitch.Aggregate: Writing to '/tmp/ig-gpo-ig-utah-createsliver-request-11-instageni-gpolab-bbn-com.xml'  <==(3)
21:28:52 INFO     stitch.Aggregate: 
	Stitcher doing createsliver at https://boss.instageni.gpolab.bbn.com:12369/protogeni/xmlrpc/am
21:29:04 ERROR    omni:  {'output': 'vlan tag for link not available', 'code': {'protogeni_error_log': 'urn:publicid:IDN+instageni.gpolab.bbn.com+log+907dbcc8cf1d9204562b3c224e0c714f', 'am_type': 'protogeni', 'geni_code': 1, 'am_code': 1, 'protogeni_error_url': 'https://boss.instageni.gpolab.bbn.com/spewlogfile.php3?logfile=907dbcc8cf1d9204562b3c224e0c714f'}, 'value': 0}
21:29:34 WARNING  stitch.Aggregate: Slivers at PG Utah may not be requested initially for > 5 days. PG Utah slivers will expire earlier than at other aggregates - requested expiration being reset from 2013-07-25T00:00:00Z to 2013-07-21T01:09:34Z
21:30:12 INFO     stitch.Aggregate: Allocation at <Aggregate urn:publicid:IDN+emulab.net+authority+cm> complete.
21:30:12 INFO     stitch.Aggregate: Writing to '/tmp/ig-gpo-ig-utah-createsliver-request-11-utah-geniracks-net.xml'       <==(3)
21:30:12 INFO     stitch.Aggregate: 
	Stitcher doing createsliver at https://boss.utah.geniracks.net:12369/protogeni/xmlrpc/am
21:30:39 INFO     stitch.Aggregate: Allocation at <Aggregate urn:publicid:IDN+utah.geniracks.net+authority+cm> complete.
21:30:39 INFO     stitch.Aggregate: Writing to '/tmp/ig-gpo-ig-utah-createsliver-request-12-instageni-gpolab-bbn-com.xml'  <==(4)
21:30:39 INFO     stitch.Aggregate: 
	Stitcher doing createsliver at https://boss.instageni.gpolab.bbn.com:12369/protogeni/xmlrpc/am
21:30:56 ERROR    omni:  {'output': 'vlan tag for link not available', 'code': {'protogeni_error_log': 'urn:publicid:IDN+instageni.gpolab.bbn.com+log+f90141724ac70ca40144bd5b8775e40f', 'am_type': 'protogeni', 'geni_code': 1, 'am_code': 1, 'protogeni_error_url': 'https://boss.instageni.gpolab.bbn.com/spewlogfile.php3?logfile=f90141724ac70ca40144bd5b8775e40f'}, 'value': 0}
21:31:41 INFO     stitch.Aggregate: Allocation at <Aggregate urn:publicid:IDN+instageni.gpolab.bbn.com+authority+cm> complete.
21:31:41 INFO     stitch.Aggregate: Writing to '/tmp/ig-gpo-ig-utah-createsliver-request-11-ion-internet2-edu.xml'       
21:31:41 INFO     stitch.Aggregate: 
	Stitcher doing createsliver at http://geni-am.net.internet2.edu:12346    <==(5)
21:32:25 INFO     stitch.Aggregate: DCN AM <Aggregate urn:publicid:IDN+ion.internet2.edu+authority+am>: must wait for status ready....
21:32:25 INFO     stitch.Aggregate: Pause to let circuit become ready...
21:33:02 INFO     stitch.Aggregate: DCN circuit 22911 is ready
21:33:09 INFO     stitch.Aggregate: Allocation at <Aggregate urn:publicid:IDN+ion.internet2.edu+authority+am> complete.
21:33:09 INFO     stitch.launcher: All aggregates are complete.
21:33:09 INFO     stitcher: Writing to 'ig-gpo-ig-utah-manifest-rspec-stitching-combined.xml'
21:33:09 INFO     stitcher: Saved combined reservation RSpec at 4 AMs to file ig-gpo-ig-utah-manifest-rspec-stitching-combined.xml   <==(7)
Stitching success: Reserved resources in slice ig-gpo-ig-utah at 4 Aggregates (including 2 intermediate aggregate(s) not in the original request), creating 1 link(s).
}}}

 (1) Sticher.py runs rspeclint on the  stitch-ig-gpo-ig-utah.rspec file. [[BR]]
 (2) Sticher.py contacts the Stitching Computation Service (SCS) and returns the list of AMs that are needed to establish the stitching path.[[BR]]
 (3) Stitcher.py generates a request RSpec for each of the aggregates in the path including ION/Internet2. [[BR]]
 (4) Second attempt at GPO InstaGENI, initial request failed because the requested VLAN was not available. [[BR]]
 (5) Request at Internet2/ION waits for DCN circuits. If this request fails, stitcher.py will try again after 600 seconds. [[BR]]
 (6) A combined manifest rspec is assembled by the stitcher.py to show all aggregates and VLANs used in the sliver. Part of the  ig-gpo-ig-utah-manifest-rspec-stitching-combined.xml below shows the hops along the stitched VLAN path, for complete content see the [attached file].

{{{
<rspec expires="2013-07-16T01:32:55.973Z" generated="2013-07-16T01:32:55.973Z" type="manifest" xmlns="http://www.geni.net/resources/rspec/3" xml
ns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.geni.net/resources/rspec/3 http://www.geni.net/resources/rspec
/3/manifest.xsd">
	<node client_id="server-gpo" component_id="urn:publicid:IDN+instageni.gpolab.bbn.com+node+pc2" component_manager_id="urn:publicid:IDN+in
stageni.gpolab.bbn.com+authority+cm" exclusive="false" sliver_id="urn:publicid:IDN+instageni.gpolab.bbn.com+sliver+7787">
		<sliver_type name="emulab-openvz"/>
		<services>
			<execute command="sudo /local/install-script.sh" shell="sh"/>
			<install install_path="/local" url="http://www.gpolab.bbn.com/~lnevers/StitchDemo.tar.gz"/>
			<login authentication="ssh-keys" hostname="pcvm2-14.instageni.gpolab.bbn.com" port="22" username="lnevers"/>
		</services>
		<emulab:routable_control_ip xmlns:emulab="http://www.protogeni.net/resources/rspec/ext/emulab/1"/>
		<interface client_id="server-gpo:if0" component_id="urn:publicid:IDN+instageni.gpolab.bbn.com+interface+pc2:eth1" mac_address="0
2501eb43d52" sliver_id="urn:publicid:IDN+instageni.gpolab.bbn.com+sliver+7790">
			<ip address="192.168.4.1" netmask="255.255.255.0" type="ipv4"/>
		</interface>
		<rs:vnode name="pcvm2-14" xmlns:rs="http://www.protogeni.net/resources/rspec/ext/emulab/1"/>
		<host name="server-gpo.ig-gpo-ig-utah.ch-geni-net.instageni.gpolab.bbn.com"/>
	</node>
	<node client_id="client-utah" component_id="urn:publicid:IDN+utah.geniracks.net+node+pc5" component_manager_id="urn:publicid:IDN+utah.ge
niracks.net+authority+cm" exclusive="false" sliver_id="urn:publicid:IDN+utah.geniracks.net+sliver+23065">
		<sliver_type name="emulab-openvz"/>
		<services>
			<execute command="sudo /local/install-script.sh" shell="sh"/>
			<install install_path="/local" url="http://www.gpolab.bbn.com/~lnevers/StitchDemo.tar.gz"/>
			<login authentication="ssh-keys" hostname="pc5.utah.geniracks.net" port="30522" username="lnevers"/>
		</services>
		<interface client_id="client-utah:if0" component_id="urn:publicid:IDN+utah.geniracks.net+interface+pc5:eth1" mac_address="02fcd2
8d7cff" sliver_id="urn:publicid:IDN+utah.geniracks.net+sliver+23068">
			<ip address="192.168.4.2" netmask="255.255.255.0" type="ipv4"/>
		</interface>
		<rs:vnode name="pcvm5-7" xmlns:rs="http://www.protogeni.net/resources/rspec/ext/emulab/1"/>
		<host name="client-utah.ig-gpo-ig-utah.ch-geni-net.utah.geniracks.net"/>
	</node>
	<link client_id="link" sliver_id="urn:publicid:IDN+ion.internet2.edu+sliver+ion.internet2.edu-22911" vlantag="3747:923">
		<!--AM urn:publicid:IDN+instageni.gpolab.bbn.com+authority+cm: sliver_id=urn:publicid:IDN+instageni.gpolab.bbn.com+sliver+7789 v
lantag=3747-->
		<!--AM urn:publicid:IDN+utah.geniracks.net+authority+cm: sliver_id=urn:publicid:IDN+utah.geniracks.net+sliver+23067 vlantag=923-
->
		<component_manager name="urn:publicid:IDN+instageni.gpolab.bbn.com+authority+cm"/>
		<component_manager name="urn:publicid:IDN+ion.internet2.edu+authority+am"/>
		<component_manager name="urn:publicid:IDN+emulab.net+authority+cm"/>
		<component_manager name="urn:publicid:IDN+utah.geniracks.net+authority+cm"/>
		<interface_ref client_id="server-gpo:if0" component_id="urn:publicid:IDN+instageni.gpolab.bbn.com+interface+pc2:eth1" sliver_id=
"urn:publicid:IDN+instageni.gpolab.bbn.com+sliver+7790"/>
		<interface_ref client_id="client-utah:if0" component_id="urn:publicid:IDN+utah.geniracks.net+interface+pc5:eth1" sliver_id="urn:
publicid:IDN+utah.geniracks.net+sliver+23068"/>
		<property capacity="100000" dest_id="client-utah:if0" source_id="server-gpo:if0"/>
		<property capacity="100000" dest_id="server-gpo:if0" source_id="client-utah:if0"/>
	</link>
	<stitching lastUpdateTime="2013-07-16T01:32:55.973Z" xmlns="http://hpn.east.isi.edu/rspec/ext/stitch/0.1/" xmlns:xsi="http://www.w3.org/
2001/XMLSchema-instance" xsi:schemaLocation="http://hpn.east.isi.edu/rspec/ext/stitch/0.1/ http://hpn.east.isi.edu/rspec/ext/stitch/0.1/stitch-s
chema.xsd">
		<path id="link">
			<globalId>
        ion.internet2.edu-22911
			</globalId>
			<lifetime id="ion.internet2.edu-22911">
				<start type="xgc">
          2013-07-25T00:00:00.000Z
				</start>
				<end type="xgc">
          2013-07-16T01:32:55.973Z
				</end>
			</lifetime>
			<hop id="1">
				<link id="urn:publicid:IDN+instageni.gpolab.bbn.com+interface+procurve2:5.24">
					<trafficEngineeringMetric>
						10
					</trafficEngineeringMetric>
					<capacity>
						100000
					</capacity>
					<switchingCapabilityDescriptor>
						<switchingcapType>
							l2sc
						</switchingcapType>
						<encodingType>
							ethernet
						</encodingType>
						<switchingCapabilitySpecificInfo>
							<switchingCapabilitySpecificInfo_L2sc>
								<interfaceMTU>
									9000
								</interfaceMTU>
								<vlanRangeAvailability>
									3747
								</vlanRangeAvailability>
								<suggestedVLANRange>
									3747
								</suggestedVLANRange>
								<vlanTranslation>
									false
								</vlanTranslation>
							</switchingCapabilitySpecificInfo_L2sc>
						</switchingCapabilitySpecificInfo>
					</switchingCapabilityDescriptor>
				</link>
				<nextHop>
					2
				</nextHop>
			</hop>
			<hop id="4">
				<link id="urn:publicid:IDN+emulab.net+interface+procurve-pgeni-atla:3.21">
					<trafficEngineeringMetric>
						10
					</trafficEngineeringMetric>
					<capacity>
						100000
					</capacity>
					<switchingCapabilityDescriptor>
						<switchingcapType>
							l2sc
						</switchingcapType>
						<encodingType>
							ethernet
						</encodingType>
						<switchingCapabilitySpecificInfo>
							<switchingCapabilitySpecificInfo_L2sc>
								<interfaceMTU>
									9000
								</interfaceMTU>
								<vlanRangeAvailability>
									923
								</vlanRangeAvailability>
								<suggestedVLANRange>
									923
								</suggestedVLANRange>
								<vlanTranslation>
									false
								</vlanTranslation>
							</switchingCapabilitySpecificInfo_L2sc>
						</switchingCapabilitySpecificInfo>
					</switchingCapabilityDescriptor>
				</link>
				<nextHop>
					5
				</nextHop>
			</hop>
			<hop id="5">
				<link id="urn:publicid:IDN+emulab.net+interface+procurveA:3.19">
					<trafficEngineeringMetric>
						10
					</trafficEngineeringMetric>
					<capacity>
						100000
					</capacity>
					<switchingCapabilityDescriptor>
						<switchingcapType>
							l2sc
						</switchingcapType>
						<encodingType>
							ethernet
						</encodingType>
						<switchingCapabilitySpecificInfo>
							<switchingCapabilitySpecificInfo_L2sc>
								<interfaceMTU>
									9000
								</interfaceMTU>
								<vlanRangeAvailability>
									923
								</vlanRangeAvailability>
								<suggestedVLANRange>
									923
								</suggestedVLANRange>
								<vlanTranslation>
									false
								</vlanTranslation>
							</switchingCapabilitySpecificInfo_L2sc>
						</switchingCapabilitySpecificInfo>
					</switchingCapabilityDescriptor>
				</link>
				<nextHop>
					6
				</nextHop>
			</hop>
			<hop id="6">
				<link id="urn:publicid:IDN+utah.geniracks.net+interface+procurve2:1.19">
					<trafficEngineeringMetric>
						10
					</trafficEngineeringMetric>
					<capacity>
						100000
					</capacity>
					<switchingCapabilityDescriptor>
						<switchingcapType>
							l2sc
						</switchingcapType>
						<encodingType>
							ethernet
						</encodingType>
						<switchingCapabilitySpecificInfo>
							<switchingCapabilitySpecificInfo_L2sc>
								<interfaceMTU>
									9000
								</interfaceMTU>
								<vlanRangeAvailability>
									923
								</vlanRangeAvailability>
								<suggestedVLANRange>
									923
								</suggestedVLANRange>
								<vlanTranslation>
									false
								</vlanTranslation>
							</switchingCapabilitySpecificInfo_L2sc>
						</switchingCapabilitySpecificInfo>
					</switchingCapabilityDescriptor>
				</link>
				<nextHop>
					null
				</nextHop>
			</hop>
		</path>
	</stitching>
</rspec>
}}}


At this point the experiment has been set up and you may determine the login information at each compute aggregate:
{{{
$ readyToLogin.py ig-gpo-ig-utah -a ig-gpo        
...
server-gpo's geni_status is: ready (am_status:ready) 
User lnevers logs in to server-gpo using:

	ssh -i /home/lnevers/.ssh/geni_cert_portal_key lnevers@pcvm2-14.instageni.gpolab.bbn.com

$ readyToLogin.py ig-gpo-ig-utah -a ig-utah

client-utah's geni_status is: ready (am_status:ready) 
User lnevers logs in to client-utah using:
	ssh -p 30522  -i /home/lnevers/.ssh/geni_cert_portal_key lnevers@pc5.utah.geniracks.net
}}}

We will use the ''server-gpo'' login to determine the routable IP address that was requested for the Web Server:
{{{
$ ssh -i /home/lnevers/.ssh/geni_cert_portal_key lnevers@pcvm2-14.instageni.gpolab.bbn.com
Warning: Permanently added 'pcvm2-14.instageni.gpolab.bbn.com,192.1.242.151' (RSA) to the list of known hosts.
[lnevers@server-gpo ~]$ /sbin/ifconfig
eth999    Link encap:Ethernet  HWaddr 02:94:6D:BC:36:DC  
          inet addr:192.1.242.151  Bcast:192.1.242.255  Mask:255.255.255.128
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:16760 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8485 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:22877000 (21.8 MiB)  TX bytes:460760 (449.9 KiB)

eth3747   Link encap:Ethernet  HWaddr 02:50:1E:B4:3D:52  
          inet addr:192.168.4.1  Bcast:192.168.4.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:63 errors:0 dropped:0 overruns:0 frame:0
          TX packets:7 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:3064 (2.9 KiB)  TX bytes:476 (476.0 b)
}}}


You may also use the ''client-utah'' login to verify connectivity between to the ''server-gpo'':
{{{
$ ssh -p 30522  -i /home/lnevers/.ssh/geni_cert_portal_key lnevers@pc5.utah.geniracks.net
[lnevers@client-utah ~]$ /sbin/ifconfig
eth923    Link encap:Ethernet  HWaddr 02:FC:D2:8D:7C:FF  
          inet addr:192.168.4.2  Bcast:192.168.4.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:54 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:2408 (2.3 KiB)  TX bytes:0 (0.0 b)

eth999    Link encap:Ethernet  HWaddr 02:CD:95:2D:16:C5  
          inet addr:172.17.5.7  Bcast:172.31.255.255  Mask:255.240.0.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:17003 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8062 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:22951047 (21.8 MiB)  TX bytes:432534 (422.3 KiB)
[lnevers@client-utah ~]$ ping -c 5 192.168.4.1
PING 192.168.4.1 (192.168.4.1) 56(84) bytes of data.
64 bytes from 192.168.4.1: icmp_req=1 ttl=64 time=161 ms
64 bytes from 192.168.4.1: icmp_req=2 ttl=64 time=80.3 ms
64 bytes from 192.168.4.1: icmp_req=3 ttl=64 time=80.4 ms
64 bytes from 192.168.4.1: icmp_req=4 ttl=64 time=80.4 ms
64 bytes from 192.168.4.1: icmp_req=5 ttl=64 time=80.4 ms

--- 192.168.4.1 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4005ms
rtt min/avg/max/mdev = 80.388/96.667/161.683/32.508 ms
}}}




== Finish the Stitching Experiment ==
{{{
#!html
<img src="http://groups.geni.net/geni/attachment/wiki/GENIExperimenter/Tutorials/Graphics/finish.png?format=raw"  alt="Finish"></a>
}}}