$ yum install nfdump

$ iptables -I INPUT -p udp -m state --state NEW -m udp --dport 2055 -j ACCEPT
$ ipt6ables -I INPUT -p udp -m state --state NEW -m udp --dport 2055 -j ACCEPT

$ nfcapd -E -T all -p 2055 -l /tmp -I any

interface GigabitEthernet0/1
ip flow ingress
ip flow-export version 5
ip flow-export destination 10.10.1.1 2055

interface Ethernet 1/1
ip route-cache flow
ip flow-export enable
ip flow-export version 5
ip flow-export destination 10.10.1.1 2055 1

$ yum install perl-Time-HiRes perl-Digest-HMAC perl-DateTime perl-libwww-perl

$ echo "local5.* /var/log/flow-ga.log" > /etc/rsyslog.conf
$ service rsyslog restart

$ nfcapd -D -w 5 -T all -p 2055 -l /tmp -I any -P /var/run/nfcapd.pid -x "/usr/bin/flow-ga.sh %d/%f"