zubr Posted December 13, 2014 Share Posted December 13, 2014 Hi, I want to write the output of tcpdump to my external SD card. The external SD card is on filesystem /dev/sdcard/sd1 and mounted to /sd (this is what Infusion Resources says). So as command for tcpdump I used tcpdump -w /sd/tcpdump.pcap but the output is not written to that SD card but to rootsfs (which has a very limited space of 3,3MB). So how can I manage tcpdump to write to the external SD card? Thank you. Chris Quote Link to comment Share on other sites More sharing options...
sud0nick Posted December 18, 2014 Share Posted December 18, 2014 I'm not 100% certain on this but according to this site https://www.wireshark.org/docs/wsug_html_chunked/AppToolstcpdump.html you have to specify both an interface AND a file in order to save output. It's worth a shot. Quote Link to comment Share on other sites More sharing options...
DataHead Posted December 19, 2014 Share Posted December 19, 2014 follow these steps cd /sd tcpdump -w ./tcpdump.pcap if you cd /sd first, it changes the working directory. the "./" means the current working directory, so it will save the log to /sd/tcpdump.pcap tested it and it works as expected Quote Link to comment Share on other sites More sharing options...
zubr Posted December 20, 2014 Author Share Posted December 20, 2014 Thank you, the way with "cd /sd" worked. Quote Link to comment Share on other sites More sharing options...
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