Any Github Experts online ?

Yucong Sun sunyucong at
Wed Feb 22 23:48:20 UTC 2017

use GIT_CURL_VERBOSE=1 GIT_TRACE=1 git <command>  will print out full
trace.  you can also try other environment variables from

In my experiences, this is usually caused by MTU discovery issue.

On Thu, Feb 23, 2017 at 7:40 AM, Bob Evans <bob at> wrote:
> Hello NANOGers,
> I have one customer that claims that 2 out of 17 downloads using the git
> command on github's service are slow and poor on our network when compared
> to others.
> However, when not using the git command , but using a simple web page link
> to a large zipped file from github, its always nice and fast. Using the
> git command 8% of the time being slow is unacceptable. Github just doesnt
> responds lethargically at best. BTW, have you seen how many hex digits a
> github ticket number is ?
> Of course Github says try a different ISP...Customer tries to tell me
> comcast is better ! What ! I dont believe it. No help from Github NOC - we
> have asked and asked... And we peer with Github and for some reason they
> do not transmit the Prefixes of the IP range that the customer uses for
> the git command. resolve IPv4 is not in the prefix list. So
> the exit is transits.
> I need more clues. Is it the resources the git command uses when checking
> files for dates etc ?
> Thank You
> Bob Evans

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