I am looking for a reliable solution to do package capture for test automation.
Right now, tcpdump has been used with the following command.
sudo tcpdump -i ens160 -w filename.pcap -G 60 -W 1
I stop tcpdump with:
kill -s SIGINT <pid>
1 out of 20 time tcpdump fails to exit properly, and the pcap file will be damaged.
Is there any way to make sure tcpdump will exit properly?
I try to specify wireless interface for curl, but something not working properly.
When lan cable disconnected, it works as expected. when lan cable is plugged in, connection timed out.
See log below, first attempt with plugged in lan cable.
user@user-Latitude-E6410:~/Downloads/ATS$ sudo curl http://speedtest4.ziggo.nl/testfile_20G.bin -o /dev/null --retry 0 --limit-rate 500000 --speed-limit 3000 --speed-time 2 --connect-timeout 5 --interface wlp2s0 --verbose
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0* Trying 212.54.52.11...
* Local Interface wlp2s0 is ip 192.168.2.73 using address family 2
* Local port: 0
* Connected to speedtest4.ziggo.nl (212.54.52.11) port 80 (#0)
> GET /testfile_20G.bin HTTP/1.1
> Host: speedtest4.ziggo.nl
> User-Agent: curl/7.47.0
> Accept: */*
>
< HTTP/1.1 200 OK
< Date: Thu, 20 Oct 2016 20:57:28 GMT
< Server: Apache
< Last-Modified: Tue, 10 Mar 2015 13:29:21 GMT
< ETag: "500000000-510ef23751ccf"
< Accept-Ranges: bytes
< Content-Length: 21474836480
< Content-Type: application/octet-stream
<
^{ [4018 bytes data]
0 20.0G 0 16.1M 0 0 487k 0 11:56:28 0:00:33 11:55:55 488k^C
user@user-Latitude-E6410:~/Downloads/ATS$ sudo curl http://speedtest4.ziggo.nl/testfile_20G.bin -o /dev/null --retry 0 --limit-rate 500000 --speed-limit 3000 --speed-time 2 --connect-timeout 5 --interface wlp2s0 --verbose
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0* Trying 212.54.52.11...
* Local Interface wlp2s0 is ip 192.168.2.73 using address family 2
* Local port: 0
0 0 0 0 0 0 0 0 --:--:-- 0:00:04 --:--:-- 0* Connection timed out after 5001 milliseconds
0 0 0 0 0 0 0 0 --:--:-- 0:00:05 --:--:-- 0
* Closing connection 0
curl: (28) Connection timed out after 5001 milliseconds
There are multiple wireless networks available with same SSID. I am looking for a solution to connect to a specific one (by BSSID).
nmcli con up ifname ap seems good, but, unfortunately, it's not working. It just connects back to the original network.