What are the tools and their usage to analyze ROS traffic and network time delay of ros tcp and udp messages?

edit

I have read that wireshark, ntop and netstat can be used to analyze ROS traffic. In my case, I am capturing ROS data in rosbag from different devices and I have found that there is delay in one of topic received from particular device as compared to other. So I am interested in analyzing ROS traffic and network delay to find out the actual cause behind it.

Can anybody tell me how to use wireshark, netstat or ntop in this context?

Thanks.