Re: Packet capture question

Yep it was taking quite along time to do the dd , but maybe if I used
the bs=x option I would have got better performance didn't think of that
until you mentioned nop used as a pad.

Jason Ish wrote:

>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
>
>--
>"OK, so I've installed Linux. Now, where's all the free beer I keep hearing about?"
>
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Received on Wed Jan 3 10:38:11 2007