Connect Mini-NDN nodes to an outside network¶
Mini-NDN nodes can be connected to an outside network indirectly by running NFD on the local machine:
(Mini-NDN node) ------ (NFD running on the host machine where Mini-NDN is running) ------- (External Network)
Add a node in root namespace¶
For this simple example, we can use a single node topology with node ‘a’
If we want node ‘a’ to connect to the host machine, we need to add a “root” node which has a link with node “a.”
Then the following code can be used:
topo = Topo() root = topo.addHost('root', inNamespace=False) a = topo.addHost('a') topo.addLink(root, a, delay='10ms') ndn = Minindn(topo=topo) ...
Run Mini-NDN with the above code and issue ifconfig on the local machine to confirm the addition of the interface. You should be able to locate “root-eth0”:
root-eth0 Link encap:Ethernet HWaddr 3e:eb:77:d2:6f:1f inet addr:18.104.22.168 Bcast:22.214.171.124 Mask:255.255.255.252 inet6 addr: fe80::3ceb:77ff:fed2:6f1f/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:34 errors:0 dropped:0 overruns:0 frame:0 TX packets:33 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:2667 (2.6 KB) TX bytes:2797 (2.7 KB)
To make the IP address associated with this interface persistent, add the following line to /etc/network/interfaces and reboot your machine:
iface root-eth0 inet manual
After rebooting, run Mini-NDN and issue the following command:
mini-ndn>net a a-eth0:b-eth0 a-eth1:c-eth0 a-eth2:root-eth0
Node “a” is connected to “root-eth0”. Now issue “ifconfig a-eth2” on node “a”:
mini-ndn>a ifconfig a-eth2 a-eth2 Link encap:Ethernet HWaddr fa:76:d4:86:d3:ba inet addr:126.96.36.199 Bcast:188.8.131.52 Mask:255.255.255.252
As learned from the previous step, the IP address of root-eth0 is 184.108.40.206.
mini-ndn>a ping 220.127.116.11 PING 18.104.22.168 (22.214.171.124) 56(84) bytes of data. 64 bytes from 126.96.36.199: icmp_seq=1 ttl=64 time=0.137 ms 64 bytes from 188.8.131.52: icmp_seq=2 ttl=64 time=0.123 ms
The host machine will also be able to ping node “a”:
VirtualBox:~$ ping 184.108.40.206 PING 220.127.116.11 (18.104.22.168) 56(84) bytes of data. 64 bytes from 22.214.171.124: icmp_seq=1 ttl=64 time=0.086 ms
Run NFD on local machine and register route¶
Start NFD on the local machine by using:
The “nfd-start” script cannot be used, since the script allows only one instance of NFD at a time. The NFD processes running on the Mini-NDN nodes will prevent the “nfd-start” script from working.
Now, using “nfdc register”, we can register a route from node “a” in Mini-NDN to the NFD process on the host machine and from the host machine to an external machine.
Also, if the local machine has a public IP, Mini-NDN nodes can be reached via external machines.
Generate NDN testbed topology¶
Run the following install.sh command
This will place a “testbed.conf” file in the topologies subdirectory, where it can be referenced as desired. To update the topology, simply rerun this command.