Use tcpdump to debug android Network programs

By default, no tcpdump is available for Android, and the next version of other people's port on the Internet is enough. this is easy to google and I will not go into details. You can also download the source code from the http://www.tcpdump.org. After NDKr5, compile it with toolchain. If we use tcpdump to debug the http program, we can write as follows: Android does not TcpdumpFrom the next version of other people's port on the Internet, this is easy to google, and I will not go into details. You can also use http: // www. Tcpdump. Org download source code compilation. After NDK r5, compile it with toolchain.
If we use tcpdump to debug the http program, we can write as follows:
Tcpdump-p-nnn-vvv-s 0-w/sdcard/1. pcap port 80 and tcp
-P is not a hybrid mode, but if it is 3G/GPRS, the difference is not big...
-Nnn displays the IP address and port directly without resolving the address.
-S 0 is best to add, otherwise many packets will be truncated, it will not be complete
-W: Save to sdcard
Port 80 and tcp. only requests on port 80 are allowed. it is more appropriate to debug http communication.
The stored pcap file can be conveniently viewed Using Wireshark.