public:networking_tools
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public:networking_tools [2020/10/10 11:17] – [Multipath Network Testing] lstolp | public:networking_tools [2020/10/18 13:34] – lstolp | ||
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====== Linux Network Testing Tools ====== | ====== 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 [[https:// | ||
- | === Hardware Used === | + | [[public: |
+ | A brief description to show how to set up multipath WAN testing device. | ||
- | fitlet2 J3455 Barebone | + | [[public: |
- | 16 GB RAM for Fitlet2 | + | [[https:// |
- | 512 GB SATA SSD for fitlet2 | + | **tcpdump** is a data-network packet analyzer computer program that runs under a command line interface. It allows the user to display TCP/IP and other packets being transmitted or received over a network to which the computer is attached. |
- | FC-M2LAN FACET-Card (2x Gbit Ethernet) | + | |
- | === Operating System === | + | [[public: |
+ | [[https:// | ||
+ | Nmap (" | ||
- | | ||
- | === Magic Sauce ==== | + | [[public: |
- | Edit **/// | + | Can be used to display bandwidth usage on an interface.\\ |
- | auto eth0 | + | [[public: |
- | iface eth0 inet static | + | [[https:// |
- | address | + | iPerf3 is a tool for active measurements of the maximum achievable bandwidth on IP networks. It supports tuning of various parameters related |
- | | + | |
- | | + | |
- | broadcast [[KA Broadcast]] | + | |
- | + | ||
- | + | ||
- | Edit **/// | + | |
- | # | + | |
- | # reserved values | + | |
- | # | + | |
- | 255 local | + | |
- | 254 main | + | |
- | 253 default | + | |
- | 0 unspec | + | |
- | # | + | |
- | # local | + | |
- | # Create multipath routing tables for Sealink | + | |
- | # A table can also be created to send traffic out the regular ship (via cyberoam | + | |
- | 1 | + | |
- | 2 ka | + | |
- | 3 | + | |
- | 4 | + | |
- | + | ||
- | Create **/// | + | |
- | + | ||
- | The multipath script needs to be run as sudo, so have installed | + | |
- | + | ||
- | # multipath.sh | + | |
- | # script to add routes out each WAN using tables created above | + | |
- | ip route add default via [[ka static ip]] dev [[ka eth]] table ka | + | |
- | ip route add default via [[sealink static ip]] dev [[sealink eth]] table hsn | + | |
- | ip route add default via [[cell static ip]] dev [[cell eth]] table cell | + | |
- | ip route add default via [[ship static ip]] dev [[cell eth]] table ship | + | |
- | + | ||
- | # Add rules to the rules | + | |
- | ip rule add from [[ka static ip]] table ka | + | |
- | ip rule add from [[sealink static ip]] table hsn | + | |
- | ip rule add from [[cell static ip]] table cell | + | |
- | ip rule add from [[ship static ip]] table ship | + | |
- | ip rule list | + | |
- | + | ||
- | + | ||
- | ===== tcpdump ===== | + | |
- | + | ||
- | + | ||
- | + | ||
- | If you ssh into a computer and want to use tcpdump to view traffic, ssh (22) can be excluded | + | |
- | tcpdump -I [interface] -n ' | + | |
- | Capture traffic leaving a host | + | |
- | tcpdump -pi [interface] src host [hostname] | + | |
- | Watch for traffic leaving one network | + | |
- | tcpdump -pi [interface] src net [network] and dst net [network2] or [network3] | + | |
- | tcpdump -pi [interface] src net 128.128.252.0/ | + | |
- | + | ||
- | ===== NMAP ===== | + | |
- | + | ||
- | + | ||
- | To see what computers are up, what OS they are running and what ports are open: | + | |
- | nmap -sS -O [network] | + | |
- | + | ||
- | + | ||
- | ===== 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] | + | |
public/networking_tools.txt · Last modified: 2024/01/25 03:31 by 127.0.0.1