Re: Packet capture question

On Tue, Jan 02, 2007 at 08:47:35PM -0600, Rob wrote:
> I am dd(ing) via netcat a partition (from a host to a vm) and I am getting alot
> of sender acks whith No-Ops I am assuming this is not normal anyone have some
> input
> Sender:
> dd if=dev/sda7 | nc xxx.xxx.xxx.xxx 9000
> Reciever: (here i get the nop)
> nc -l -p 9000 | dd of=/dev/sda7
>
>
>
>
>
> 18:33:20.011196 IP spencer.usask.ca.35584 > engr-vserv1-vm3.usask.ca.9000: P
> 648704:650152(1448) ack 1 win 1460 <nop,nop,timestamp 2833435812 1037640>
> 18:33:20.011216 IP engr-vserv1-vm3.usask.ca.9000 > spencer.usask.ca.35584: . ack
> 651600 win 19506 <nop,nop,timestamp 1037641 2833435812,nop,nop,sack 1
> {653048:654496}>

These nop's are simply padding in the TCP header, most likely because
some of the options present need to be aligned on a 4 byte boundary.

Is there something wrong with the transfer? Upon quick inspection, I
don't see anything odd here.

-- Jason
Received on Wed Jan 3 09:04:21 2007