Prepare for your network administrators to cringe… I’ve spoken on these commands but never really put them together in this way, exactly. So I wanted to find a coworker on a network. So one way to find people is to use a ping sweep. Here I’m going to royally piss off my switch admins and ping sweep the subnet: ping 255.255.255.255 Next, I’m going to run arp to translate: arp -a Finally, if a machine is ipv6, it wouldn’t show up. So I’m going to run: ndp -a Now, I find the hostname, then look at the MAC address, copy that to my clipboard, find for that to get the IP…
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Mac Network Commands Cheat Sheet
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. Good luck out there, and stay salty. Get an ip address for en0: ipconfig getifaddr en0 Same thing, but setting and echoing a variable: ip=`ipconfig getifaddr en0` ; echo $ip View the subnet mask of en0: ipconfig getoption en0 subnet_mask View the dns server for en0: ipconfig getoption en0 domain_name_server Get information about how en0 got its dhcp on: ipconfig getpacket en1 View some network info: ifconfig en0 Set en0 to have an ip address of 10.10.10.10…
- Mac OS X, Mac OS X Server, Mac Security, Network Infrastructure, Network Printing, Ubuntu, Unix, VMware
Use Netstat To Locate What Process Is Using A Port
You’re installing software on some host. The installation goes well and then you go to access the information you need or connect to the service from another host. Wait, what’s that? Port is already in use? Crap. We’ve all been there. The quick and dirty answer: netstat. Let’s say you’re trying to use port 8080: netstat -tuln | grep 8080 Let’s say the response is httpd. OK, let’s see where that’s located using whereis: whereis httpd And what kind of file is httpd: file /usr/sbin/httpd Which responds with: /usr/sbin/httpd: Mach-O 64-bit executable x86_64 I guess we knew that since it had a port open, but what type of executable is…
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5 Free Network Troubleshooting Tools for iPhone and iPod Touch (and iPad of course)
There are a number of ways to troubleshoot network connections on (or using) an iOS device. These can be common troubleshooting steps that you might run from the command line or a third party app on a desktop computer or they could be specific to testing the network environment for an iOS device. Some of these apps are even free. Ping Lite One of the most common tasks that most administrators routinely do to test both DNS resolution and connectivity is pinging something. Ping Lite comes with a function to show your IP, a ping tool, a tool to ping the subnet, the ability to run trace routes and for…