Strange source port filtering by Tinet

[Marco Hogewoning]

On 20 jul 2010, at 10:51, Alexander Gall wrote:

> I've noticed a very peculiar problem with IPv6 traffic transitting
> through AS3257.  They did respond to a request to find the problem,
> but a week has passed and I suspect that they are not taking me very
> seriously.  I believe that this problem affects all traffic, so I'd be
> interested if some of you could verify this.  It's a bit complicated,
> but please bear with me.  Here's the story.
> I actually scanned all ports from 1024 through 65535 with dig and it's
> exactly those 256 ports that share this fate.  Note that the port
> range in hex is 0x8900 through 0x89ff and 0x89 is 137 in decimal.  A
> wild speculation is that a filter for NetBIOS at the Tinet border
> could be buggy.
> 
> I can reproduce this from our own AS559 as well as from a host in
> AS2914.  To support my theory, I'd be grateful if some of you could
> run these dig and traceroute tests to see if you can reproduce this.


I can reproduce thiis from within AS3265, both by taking a route via he.net as well as  direct via 3257.

Groet,

MarcoH