Is there a tool/command to show connections per sec?
I've tried a few iptraf and iftop but I can't see anything about connection rates.
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I believe you can use
/proc/net/ to view the number of connections at that instant. Check this every second.
# cat /proc/net/sockstat sockets: used 124 TCP: inuse 23 orphan 0 tw 20 alloc 28 mem 10 UDP: inuse 6 mem 0 RAW: inuse 5 FRAG: inuse 0 memory 0
And to count the number of TCP connections at this moment, do:
# wc -l /proc/net/tcp 28 /proc/net/tcp