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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.

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

tcpdump

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 128.128.252.0/28 and dst 192.168.11.0/24 or 192.168.12/24

NMAP

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

nmap -sS -O [network]    ie: nmap -sS -O 192.168.11.0

iftop

To look at https traffic on the science network:

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

iPerf

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.1602326474.txt.gz · Last modified: 2020/10/10 10:41 by lstolp