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Linux Network Testing Tools

Multipath Network Testing

To test different network paths from ship to shore using each WAN option directly. For this test we used a fitlet2 computer with 4 Gigibit Ethernet ports.

Hardware Used
fitlet2 J3455 Barebone
16 GB RAM for Fitlet2
512 GB SATA SSD for fitlet2
FC-M2LAN FACET-Card (2x Gbit Ethernet)


If you ssh into a computer and want to use tcpdump to view traffic, ssh (22) can be excluded

tcpdump -I [interface] -n 'port!22'

Capture traffic leaving a host

tcpdump -pi [interface] src host [hostname]

Watch for traffic leaving one network and entering two other networks

tcpdump -pi [interface] src net [network] and dst net [network2] or [network3]
tcpdump -pi [interface] src net and dst or 192.168.12/24


To see what computers are up, what OS they are running and what ports are open:

nmap -sS -O [network]    ie: nmap -sS -O


To look at https traffic on the science network:

iftop -i [interface] -f "dst port 443" 


Need to setup a server (sender) and client (listener)

On shore just listen
       iperf -s -u
On shore listen on a certain port    
    iperf -s -u -p 55437
From ship, send 7 M
   iperf -c [shoreip number]  -u -t 120 -b 7M
public/networking_tools.1602326702.txt.gz · Last modified: 2020/10/10 10:45 by lstolp