How to add wireshark to the ndsdn-tutorial?

Getting Started with P4
1

I am now analyzing the experiment and need to use Wireshark tool to analyze the data packets of each P4 switch,

but I don’t know how to use Wireshark in the docker environment in ONOS tutorial to view the data packets of specific switches.

I would be very grateful if I could get help!

3

The main problems are as follows:

I enter mininet’s container, can’t download Wireshark, and can’t use sudo.

image

4

Hi,

For this particular use case I recommend either onos-dev mail list or the repository itself since the question is not as much related to P4. I will answer anyway.

Some time ago, I prepared a script for this use case:

#!/bin/bash

DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"

if [ -z $2 ]; then
  echo "usage: $0 host"
  exit 1
fi

file=$3.pcap

set -e

echo "*** Starting tcpdump on ${iface}... Ctrl-c to stop capture"
echo "*** Pcap file will be written in ngsdn-tutorial/tmp/${file}"
docker exec -it $1 tcpdump -i $2 -w /tmp/"${file}"

docker cp $1:/tmp/"${file}" $HOME/ngintent-scenario/util

if [ -x "$(command -v wireshark)" ]; then
  echo "*** Opening wireshark... Ctrl-c to quit"
  wireshark "${DIR}/../tmp/${file}"
fi

I think I used t run it as:

script.sh container_name interface_name file_name

Place the script code at a file name script.sh in util folder. Give execution rights (chmod +x). In this way you can run tcpdump at the container, then use the typical interface names used by mininet like s2-eth0 and so on and give it a name to the pcap file. After you sniff come packets, type CONTROL+C and the pcap will be available at util folder. Then you can open it with the VM Wireshark.

Cheers,

5

Thank you,

ederollora,

Your answer is too timely. Thank you again. I will try to solve the problem with this solution

Maybe my English is a little poor.

6

Hi friends,

I want to connect to the virtual host in mininet for testing in the ngsdn-tutorial, but it doesn’t seem to support xterm in docker. I want to know how to connect to the terminal of mininet virtual host.Or is there any way to install xterm under mininet in docker?

Thank you!

7

Hi,

Since the question is not directly related to P4, I recommened you ask the question here: Issues · opennetworkinglab/ngsdn-tutorial · GitHub . Other users can also help in the repository tab I linked :slight_smile:

To prevent from leaving you without an answer… did you try to connect to the container bash terminal and then to the host? Not sure if I tried it in the past because of the lack of xterm.

I will reference myself in a previous answer in the repository tab for issues:

You can still get a direct CLI to the host (without using Mininet).

The first thing is to access Mininet container CLI:
sudo docker exec -it mininet bash

To get a CLI for h1a or any name:
lsns | grep h1a -m1 | awk '{print $4}'

The number from the previous command should replace PID_HERE:
nsenter --target PID_HERE --mount --uts --ipc --net --pid

Cheers,