Take a look at Cacti, which is available in the EPEL repo:
https://www.cacti.net/
It's not just for network accounting. It polls multiple hosts for all
kinds of data and keeps RRD tables for display. Cacti provides a web
interface that can display the data in charts. You'll need to install
plugins for iptables to do the actual data collection.
I've used this to track per-host Internet usage on my LAN by adding an
iptables chain with one do-nothing rule per LAN host, just to maintain a
counter for Cacti to poll.
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