Netstat statistics IPv6 issue

[Tarjaizaid]

Hello,

I think I have a problem with ipv6 netstat statistics. The graph show correct "listen connections" but wrong value for "established connections". I count 5 "established connections" for IPv6.

What did you think ?

Thanks Tarjaizaid

[mikaku]

Hello,

Monitorix uses the command netstat -tn -A inet6 to get the network stats. Can you, please, compare in your system the output of that command with the one you used in your second screen shot?

Just to make sure that they are showing exact results. Thanks.

[Tarjaizaid]

i've run this command. I count 7 established connetion while the chart display 0 connection.

[mikaku]

Monitorix collects statistical data on every minute and the values represented are averages, so unless your established connections keep established for a whole minute (or more), you won't see such 7 counted reflected.

This is not a bug but a feature.

[Tarjaizaid]

I make another test :

$ while true; do date; sudo netstat -tn -A inet6 | wc -l ; sleep 35; done Mon Sep 15 19:56:33 CEST 2014 7 Mon Sep 15 19:57:08 CEST 2014 6 Mon Sep 15 19:57:43 CEST 2014 7 Mon Sep 15 19:58:19 CEST 2014 7 Mon Sep 15 19:58:54 CEST 2014 7 Mon Sep 15 19:59:29 CEST 2014 8 Mon Sep 15 20:00:04 CEST 2014 7 Mon Sep 15 20:00:39 CEST 2014 6 Mon Sep 15 20:01:14 CEST 2014 6 Mon Sep 15 20:01:50 CEST 2014 10 Mon Sep 15 20:02:25 CEST 2014 16 Mon Sep 15 20:03:01 CEST 2014 8 Mon Sep 15 20:03:36 CEST 2014 6 Mon Sep 15 20:04:11 CEST 2014 6 Mon Sep 15 20:04:46 CEST 2014 6 Mon Sep 15 20:05:22 CEST 2014 6 Mon Sep 15 20:05:57 CEST 2014 7 Mon Sep 15 20:06:32 CEST 2014 10 Mon Sep 15 20:07:07 CEST 2014 9 Mon Sep 15 20:07:43 CEST 2014 9 Mon Sep 15 20:08:18 CEST 2014 10

(remove 2 for : Active Internet connections (w/o servers) Proto Recv-Q Send-Q Local Address Foreign Address State )

[mikaku]

Tarjaizaid,

I think that you misunderstood the command line netstat -tn -A inet6. That command line doesn't returns only a list of ESTABLISHED connections, but a list of current connections including CLOSE_WAIT, TIME_WAIT, LAST_ACK, ESTABLISHED, etc.

So, the result after filtering with wc -l is not the number of ESTABLISHED connections. I hope that helped you.

[Tarjaizaid]

i've test the patch on two computer. The changes works.

This code count only UDP listen, but i've a weird behavior. Netstat display UDP established connection for NTP trafic and not for Mumble Voice trafic. I don't think it's a good idea to count.

[mikaku]

Ok thanks, I'll apply the patch right now.

[Tarjaizaid]

hello,

I noticed an error in the UDP listen. For IPv6, monitorix shows 0 when I count five.

There is an error in the file netstat.pm. Line 238: I replaced $ i6_udp ++ if / ^ udp \ s + /; by $ i6_udp ++ if / ^ udp6 \ s + /;

This solves the problem.

Best regards tgz :)

[mikaku]

Please, check the latest commit and let me know if that works for you. Thanks!

[Tarjaizaid]

it works well