I’m going to start sharing little techie tidbits that require me to go scour the Internet for exactly how to do them, in hopes of making you able to do it in a lot less time than it took me! So I’m having trouble with connection times spiking to an Amazon Web Services ELB, so it’s time to break out the tcpdump to take packet traces and the wireshark (was ethereal long ago) to analyze it. I’m on OSX El Capitan (10.11.6). Tcpdump comes on OSX (or if it doesn’t, something installed it without me knowing!). Step one is figure out what network interface you want to dump. This will list all your network interfaces.
Networksetup -listallhardwareports Then, run a packet trace on that interface. I’m using en0 the primary wireless interface, so I run: sudo tcpdump -i en0 -s 0 -B 524288 -w /Desktop/DumpFile01.pcap I go to another window and hit the URL I’m having trouble with – you can use whatever, but I used ab (Apachebench) which comes with OSX. Other popular URL-hitters you might install are curl, wget, and siege. Ab -n 10 Then come back and control-C out of the tcpdump capture. Now I have a network dump of me hitting that URL (plus whatever other shenanigans my computer was up to at the time, so there’s probably a lot of noise in there from chat clients etc.). Now to analyze it – wireshark.
I had to go a couple rounds with the installation. If you want the UI you need to install it as: brew install wireshark -with-qt (If you just install wireshark without –with-qt you don’t get wireshark, you get a command line called tshark, and then you need to reinstall) For this, as with most things, you need Xcode or at least the Xcode command line tools (I always just install the tools). You install them with: xcode-select -install But if you have an older version (. Search for:. Subscribe Enter your email address to subscribe to the Agile Admin and receive notifications of new posts by email. Join 5,327 other followers. Recent Comments.
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