TCP Window Scaling issue

Zach Hill zach.reborn at gmail.com
Thu Jul 24 19:19:46 UTC 2014


I don't have root access to that server but I should be able to get it then
get some tcpdumps.


On Thu, Jul 24, 2014 at 3:18 PM, Matthew Petach <mpetach at netflight.com>
wrote:

>
>
>
> On Thu, Jul 24, 2014 at 12:13 PM, Zach Hill <zach.reborn at gmail.com> wrote:
>
>> All are from SPAN ports at each end. So for the second round of packet
>> captures Site 1 is from a SPAN port off the NIC of Server A. Site 2 is from
>> a SPAN port off the NIC of the MPLS router.
>>
>> The first round of packet captures are only from the SPAN port off the
>> MPLS router at Site 2.
>>
>
> I have to dash out of a few hours; but the short
> answer is the first round of packet captures
> are too far from the host to matter.
>
> second set are doing better, but still
> would be best to compare with tcpdumps
> from the device A itself, to see what it
> thinks it's sending out, vs what is seen
> upstream of it.  Can you grab tcpdumps
> from server A itself?
>
> Thanks!
>
> Matt
>
>
>>
>> On Thu, Jul 24, 2014 at 3:08 PM, <Valdis.Kletnieks at vt.edu> wrote:
>>
>>> On Thu, 24 Jul 2014 14:33:56 -0400, Zach Hill said:
>>>
>>> > First is the SYN from Server A to Server B
>>> http://i.imgur.com/E5cu4ev.png
>>>
>>> Was this captured with tcpdump on Server A on its way out, or on Server B
>>> on its way in, or at some other point using a span port?  The answer
>>> matters
>>> if we're suspecting that something along the way is stomping the
>>> option....
>>>
>>
>>
>


More information about the NANOG mailing list