[ovs-dev] Openflow ofp 1.o wireshark plugin

Ben Pfaff blp at nicira.com
Tue Sep 10 04:33:14 UTC 2013


On Tue, Sep 10, 2013 at 08:23:42AM +0400, Vasiliy Tolstov wrote:
> 2013/9/10 Vasiliy Tolstov <v.tolstov at selfip.ru>:
> >
> > No in both cases thernet frame message have 342 bytes.
> 
> This is openflow ethernet frame in packet in
> 0000   ff ff ff ff ff ff 52 54 00 5c cd 3a 08 00 45
> 0010   10 01 48 00 00 00 00 80 11 39 96 00 00 00 00 ff ff
> 0020   ff ff 00 44 00 43 01 34 cb 48 01 01 06 00 e6 39
> 0030   0c 51 00 03 00 00 00 00 00 00 00 00 00 00 00 00
> 0040   00 00 00 00 00 00 52 54 00 5c cd 3a 00 00 00 00
> 0050   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 0060   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 0070   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 
> This is normal dhcp message
> 0000   ff ff ff ff ff ff 52 54 00 5c cd 3a 08 00 45 10
> 0010   01 48 00 00 00 00 80 11 39 96 00 00 00 00 ff ff
> 0020   ff ff 00 44 00 43 01 34 cb 4b 01 01 06 00 e6 39
> 0030   0c 51 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 0040   00 00 00 00 00 00 52 54 00 5c cd 3a 00 00 00 00
> 0050   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 0060   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 0070   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 0080   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 0090   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 00a0   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 00b0   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 00c0   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 00d0   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 00e0   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 00f0   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 0100   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 0110   00 00 00 00 00 00 63 82 53 63 35 01 01 37 07 01
> 0120   1c 02 03 0f 06 0c ff 00 00 00 00 00 00 00 00 00
> 0130   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 0140   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 0150   00 00 00 00 00 00

The differences between these messages are different dhcp xids
(0x0134cb48 versus 0x0134cb4b) and, if I'm counting correctly, different
dhcp yiaddrs.  I see no other differences other than the first frame
being cut off after 128 bytes.  That is undoubtedly because you did not
tell the switch to send more than 128 bytes, which is the default.



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