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Tcpdump -qns 0 -A -r /var/tmp/capture.pcap Read tcpdump (cap) files and try to make them human readable:

Setup a network listener on port 2196 for testing:Ĭapture all the packets for a given port going to a given destination of 10.0.0.48:Ĭapture the packets as above but dump to a pcap file:

usr/bin/nc -v -w 15 2195Įstablish a network connection with only allowing ipv4 Scan port 80 of /System/Library/CoreServices/Applications/Network\ Utility.app/Contents/Resources/stroke 80 80Įstablish a network connection with nc -v 80Įstablish a network connection with over port 2195 View network information as it happens (requires ntop to be installed): View the statistics for a specific network protocol: Trace the routes without looking up names: System/Library/PrivateFrameworks/amework/Versions/A/Resources/airport -s System/Library/PrivateFrameworks/amework/Versions/A/Resources/airport -I Get information about the airport connection on your system:

Ping the hostname 5 times and then stop the ping:Ĭustomize the source IP during your ping: Launchctl load -w /System/Library/LaunchDaemons/ Launchctl unload -w /System/Library/LaunchDaemons/ Socketfilterfw -t
“/Applications/FileMaker Pro/FileMaker Pro.app/Contents/MacOS/FileMaker Pro”Īdd a route so that traffic for 10.0.0.0/32 communicates over the 10.0.9.2 network interface: Launchctl load /System/Library/LaunchDaemons/.plist
launchctl load /System/Library/LaunchAgents/.plistĪllow an app to communicate outside the system through the application layer firewall: Launchctl unload /System/Library/LaunchAgents/.plist
launchctl unload /System/Library/LaunchDaemons/.plist Obtain the dns servers used on the Wi-Fi interface: Networksetup -setmanual Wi-Fi 10.0.0.2 255.255.255.0 10.0.0.1Ĭonfigure the dns servers for a given network interface: Ipconfig set en1 BOOTP & ipconfig set en1 DHCPĮcho "add State:/Network/Interface/en0/RefreshConfiguration temporary" | sudo scutil Set the interface called Wi-Fi to obtain it if it isn’t already Networksetup -ordernetworkservices “Wi-Fi” “USB Ethernet” Networksetup -setnetworkserviceenabled offĬhange the order of your network services: Networksetup -renamenetworkservice Ethernet Wired Rename the network service called Ethernet to the word Wired: List all of the network interfaces on the system: Switch the active location to a location called Work, but also show the GUID of that location so we can make scripties with it laters: Switch the active location to a location called Work: Networksetup -createlocation Work populate Obtain the active location the system is using:Ĭreate a network location called Work and populate it with information from the active network connection: Show a list of locations on the computer: Get information about how en0 got its dhcp on: Ipconfig getoption en0 domain_name_server Same thing, but setting and echoing a variable: After writing up the presentation for MacSysAdmin in Sweden, I decided to go ahead and throw these into a quick cheat sheet for anyone who’d like to have them all in one place.