Check the total NIC traffic

install tool nload

[[email protected]]# yum install -y epel-release
[[email protected]]# yum install -y nload

View NIC traffic

[[email protected]]# nload wlp3s0
Figure 1: nload screenshot

View specific process traffic

installation tool nethogs

[[email protected]]# yum install -y epel-release
[[email protected]]# yum install -y nethogs

View process traffic

Figure 2: nethogs screenshot

Ref