Understanding network traffic

[Henry]

I am monitoring a VM and looking at the network graph the netout traffic looks high and I am wondering how to know when my card throughput is at capacity.

I have a single gigabit card from Proxmox to the switch.

The network traffic (hourly average) graph sits around the 500k mark and peaks at 900k every now and then.

How should I interpret this chart and does it indicate a network bottleneck?

Thanks

 

[fibo_fr]

How many of these are due to botnets or other bad-guys-tests?
tail -200 /var/log/auth.log

Which firewall / iptables have you enabled at the VM level?