I have a problem with my networking performance. I am using Ubuntu 16.04 on VMware Cloud Server with NIC E1000. But I see some packets dropped in sections of ifconfig command:
root@ubuntu:~# ifconfig ens192 ens192 Link encap:Ethernet HWaddr 00:50:56:03:25:14 inet addr:220.127.116.11 Bcast:18.104.22.168 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:574749 errors:0 dropped:83 overruns:0 frame:0 TX packets:76478 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:44109471 (44.1 MB) TX bytes:19484534 (19.4 MB)
Although it just some packets dropped but my server is running a real-time game online, so you know it impacts my clients that are connecting to it.
I have done in some researching and exploring information on Google, after that I tried to change config file for buffer ring, max windows size, and so on. But it still drops my packets.
So, now I want to capture packets that dropped for analyzing what type of packets exactly it is.
I also tried this capture for my view in wireshark:
sudo tcpdump -i ens192 -n -w /var/www/html/logs.pcap -C 1 -Z root
But I don't think I can see what packets are dropped! I think packets dropped is ignored before going to the filter of tcpdump.
Can you suggest me what method to capture "dropped packets" above (dropped:83)?
Thanks in advance!