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diff --git a/content/en/docs/Tutorials/tutorial-3.md b/content/en/docs/Tutorials/tutorial-3.md new file mode 100644 index 0000000..90d4cb4 --- /dev/null +++ b/content/en/docs/Tutorials/tutorial-3.md @@ -0,0 +1,216 @@ +--- +title: "Flow statistics" +author: "Dimitri Staessens" +date: 2019-08-31 +#type: page +draft: false +weight: 30 +description: > + Monitoring your flows. +--- + +For this tutorial, you should have a local layer, a normal layer and a +ping server registered in the normal layer. You will need to have the +FUSE libraries installed and Ouroboros compiled with FUSE support. We +will show you how to get some statistics from the network layer which is +exported by the IPCPs at /tmp/ouroboros (this mountpoint can be set at +compile time): + +```bash +$ tree /tmp/ouroboros +/tmp/ouroboros/ +|-- ipcpd-normal.13569 +| |-- dt +| | |-- 0 +| | |-- 1 +| | `-- 65 +| `-- lsdb +| |-- 416743497.465922905 +| |-- 465922905.416743497 +| |-- dt.465922905 +| `-- mgmt.465922905 +`-- ipcpd-normal.4363 + |-- dt + | |-- 0 + | |-- 1 + | `-- 65 + `-- lsdb + |-- 416743497.465922905 + |-- 465922905.416743497 + |-- dt.416743497 + `-- mgmt.416743497 + +6 directories, 14 files +``` + +There are two filesystems, one for each normal IPCP. Currently, it shows +information for two components: data transfer and the link-state +database. The data transfer component lists flows on known flow +descriptors. The flow allocator component will usually be on fd 0 and +the directory (DHT). There is a single (N-1) data transfer flow on fd 65 +that the IPCPs can use to send data (these fd's will usually not be the +same). The routing component sees that data transfer flow as two +unidirectional links. It has a management flow and data transfer flow to +its neighbor. Let's have a look at the data transfer flow in the +network: + +```bash +$ cat /tmp/ouroboros/ipcpd-normal.13569/dt/65 +Flow established at: 2018-03-07 18:47:43 +Endpoint address: 465922905 +Queued packets (rx): 0 +Queued packets (tx): 0 + +Qos cube 0: + sent (packets): 4 + sent (bytes): 268 + rcvd (packets): 3 + rcvd (bytes): 298 + local sent (packets): 4 + local sent (bytes): 268 + local rcvd (packets): 3 + local rcvd (bytes): 298 + dropped ttl (packets): 0 + dropped ttl (bytes): 0 + failed writes (packets): 0 + failed writes (bytes): 0 + failed nhop (packets): 0 + failed nhop (bytes): 0 + +<no traffic on other qos cubes> +``` + +The above output shows the statistics for the data transfer component of +the IPCP that enrolled into the layer. It shows the time the flow was +established, the endpoint address and the number of packets that are in +the incoming and outgoing queues. Then it lists packet statistics per +QoS cube. It sent 4 packets, and received 3 packets. All the packets +came from local sources (internal components of the IPCP) and were +delivered to local destinations. Let's have a look where they went. + +```bash +$ cat /tmp/ouroboros/ipcpd-normal.13569/dt/1 +Flow established at: 2018-03-07 18:47:43 +Endpoint address: flow-allocator +Queued packets (rx): 0 +Queued packets (tx): 0 + +<no packets on this flow> +``` + +There is no traffic on fd 0, which is the flow allocator component. This +will only be used when higher layer applications will use this normal +layer. Let's have a look at fd 1. + +``` +$ cat /tmp/ouroboros/ipcpd-normal.13569/dt/1 +Flow established at: 2018-03-07 18:47:43 +Endpoint address: dht +Queued packets (rx): 0 +Queued packets (tx): 0 + +Qos cube 0: + sent (packets): 3 + sent (bytes): 298 + rcvd (packets): 0 + rcvd (bytes): 0 + local sent (packets): 0 + local sent (bytes): 0 + local rcvd (packets): 6 + local rcvd (bytes): 312 + dropped ttl (packets): 0 + dropped ttl (bytes): 0 + failed writes (packets): 0 + failed writes (bytes): 0 + failed nhop (packets): 2 + failed nhop (bytes): 44 + +<no traffic on other qos cubes> +``` + +The traffic for the directory (DHT) is on fd1. Take note that this is +from the perspective of the data transfer component. The data transfer +component sent 3 packets to the DHT, these are the 3 packets it received +from the data transfer flow. The data transfer component received 6 +packets from the DHT. It only sent 4 on fd 65. 2 packets failed because +of nhop. This is because the forwarding table was being updated from the +routing table. Let's send some traffic to the oping server. + +```cmd +$ oping -n oping_server -i 0 +Pinging oping_server with 64 bytes of data: + +64 bytes from oping_server: seq=0 time=0.547 ms +... +64 bytes from oping_server: seq=999 time=0.184 ms + +--- oping_server ping statistics --- +1000 SDUs transmitted, 1000 received, 0% packet loss, time: 106.538 ms +rtt min/avg/max/mdev = 0.151/0.299/2.269/0.230 ms +``` + +This sent 1000 packets to the server. Let's have a look at the flow +allocator: + +```bash +$ cat /tmp/ouroboros/ipcpd-normal.13569/dt/0 +Flow established at: 2018-03-07 18:47:43 +Endpoint address: flow-allocator +Queued packets (rx): 0 +Queued packets (tx): 0 + +Qos cube 0: + sent (packets): 1 + sent (bytes): 59 + rcvd (packets): 0 + rcvd (bytes): 0 + local sent (packets): 0 + local sent (bytes): 0 + local rcvd (packets): 1 + local rcvd (bytes): 51 + dropped ttl (packets): 0 + dropped ttl (bytes): 0 + failed writes (packets): 0 + failed writes (bytes): 0 + failed nhop (packets): 0 + failed nhop (bytes): 0 + +<no traffic on other qos cubes> +``` + +The flow allocator has sent and received a message: a request and a +response for the flow allocation between the oping client and server. +The data transfer flow will also have additional traffic: + +```bash +$ cat /tmp/ouroboros/ipcpd-normal.13569/dt/65 +Flow established at: 2018-03-07 18:47:43 +Endpoint address: 465922905 +Queued packets (rx): 0 +Queued packets (tx): 0 + +Qos cube 0: + sent (packets): 1013 + sent (bytes): 85171 + rcvd (packets): 1014 + rcvd (bytes): 85373 + local sent (packets): 13 + local sent (bytes): 1171 + local rcvd (packets): 14 + local rcvd (bytes): 1373 + dropped ttl (packets): 0 + dropped ttl (bytes): 0 + failed writes (packets): 0 + failed writes (bytes): 0 + failed nhop (packets): 0 + failed nhop (bytes): 0 +``` + +This shows the traffic from the oping application. The additional +traffic (the oping sent 1000, the flow allocator 1 and the DHT +previously sent 3) is additional DHT traffic (the DHT periodically +updates). Also note that the traffic reported on the link includes the +FRCT and data transfer headers which in the default configuration is 20 +bytes per packet. + +This concludes tutorial 3. |