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Howto:Record, analyze and replay multiplayer flights with network tools: Difference between revisions
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Howto:Record, analyze and replay multiplayer flights with network tools (view source)
Revision as of 12:30, 17 February 2013
, 17 February 2013→tcprewrite magic: magic end
(→tcprewrite magic: start of the paractical exemple) |
(→tcprewrite magic: magic end) |
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* the computer we will use to send the recorded packets: mac address 99:88:77:66:55:44, ip address 192.168.1.17 | * the computer we will use to send the recorded packets: mac address 99:88:77:66:55:44, ip address 192.168.1.17 | ||
It's up to you to find your mac and ip address, you can use wireshark on some network traffic between the 2, or ifconfig on linux etc... | It's up to you to find your mac and ip address, you can use wireshark on some network traffic between the 2, or ifconfig on linux etc...<br> | ||
here's the "magic" line: | |||
tcprewrite -C --enet-smac=99:88:77:66:55:44 --enet-dmac=00:11:22:33:44:55 | |||
-S 0.0.0.0/0:192.168.1.17 -D 0.0.0.0/0:192.168.1.12 -i recorded.cap -o readytosend.cap | |||
where: | |||
* -C force a checksum recalculation, if not the packets arenot valid andarenot sent | |||
* --enet-smac give the mac address of the sender | |||
* --enet-dmac same with the receiver | |||
* -S change source ip address | |||
* -D idem destination | |||
* -i input file (the previously recorded flight) | |||
* -o output file | |||
tcprewrite don't need to be root to be used, but using tcpreplay to see again the recorded traffic need a root access to use the network interface.<br> | |||
Now we start FG, with mp protocol enabled by sending to a server (can be a mpserver, or the address of a valid local host on your network, eg 192.168.0.17). Finally we start replaying the flight, on the dedicaced PC: | |||
tcpreplay -i eth0 readytosend.cap | |||
be sure to use the correct name for the network interface, ifconfig/ipconfig is your friend here! | |||
if you are to lazy to make a record yourself, you can use this [http://janodesbois.free.fr/flightgear/cap_files/vercors_test.cap.bz2 flight in french vercors] (3.4M), starting at LFLU with the ufo or a plane in the 400+ kts, and follow the leader F-4N in a vercors trip. It's better with a detailled scenery like "la france d'el maxo" or une scene 850. Just decompress it, and use tcprewrite to match your config. | |||