"txfh2007" <[email protected]> writes: > Hi Aaron:
Hi Timo, > Sorry to bother, I have found your patch about > ovs-tcpundump(https://patchwork.ozlabs.org/patch/860190/), but I don't know > how to use this script. From the ovs-tcpundump -help I know this command > need a file as its arg（am i right?）, but I don't know which file type could > be use, the .pcap file? > Could you please explain the usage of the ovs-tcpundump script ? Glad to help. I've CC'd the ovs-dev list, also. First, from the manpage: The ovs-tcpundump program reads 'tcpdump -xx' output on stdin, looking for hexadecimal packet data, and dumps each Ethernet as a single hexadecimal string on stdout. This format is suitable for use with the 'ofproto/trace' command supported by ovs-vswitchd(8) via ovs-appctl(8). So the purpose of the program is to take output from tcpdump (or ovs-tcpdump - maybe it would be a good idea to update that manpage?) and convert it into something that can be passed to ofproto/trace. I think it could also be used as a way to generate data to pass to the 'packet-out' utility of the 'ovs-ofctl(8)' command. The 'file' appearing in the command synopsis section of the manpage might be misleading. It isn't an argument. I read it as indicating that the 'ovs-tcpundump' utility takes input via stdin and that input should be formatted in the same manner as 'tcpdump -xx' appears (so not a pcap, but the actual text output). ex: tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on enp0s31f6, link-type EN10MB (Ethernet), capture size 262144 bytes 09:59:08.246074 ARP, Request who-has 10.18.25.205 tell _gateway, length 46 0x0000: ffff ffff ffff 54e0 3230 be81 0806 0001 0x0010: 0800 0604 0001 54e0 3230 be81 0a12 19fe 0x0020: 0000 0000 0000 0a12 19cd 0000 0000 0000 0x0030: 0000 0000 0000 0000 0000 0000 I take that and pipe it into ovs-tcpundump: 10:01:36 aconole@dhcp-25 {ct_error} ~/git/ovs/tests$ ../utilities/ovs-tcpundump < /tmp/foo.txt ffffffffffff54e03230be810806000108000604000154e03230be810a1219fe0000000000000a1219cd000000000000000000000000000000000000 If you have a pcap, it's possible to use tcpdump like: tcpdump -r some.pcap -xx | ./utilities/ovs-tcpundump Did I answer the question? > Thanks ! > > Timo _______________________________________________ dev mailing list [email protected] https://mail.openvswitch.org/mailman/listinfo/ovs-dev
