Using RHEL/CentOS 6.7 -- I want to be be able to know byte counts on IPv4 ports.  We have thousands.. I would think counting via IP Tables for that would be a bit unweldy and slow the firewall a wee bit.  I guess Linux does not keep a running total of the bytes/port in /proc somewhere.I've been looking at ss, netstat, iptraf and netlink.  They don't give me what I'm looking for... is this information already available or am I going to have to setup firewall counters?
Count Bytes by Ports
linux;iptables;tcp