[Story] When IPv6 Fixes IPv4 Peering Issues
Jon Lewis
jlewis at lewis.org
Mon Jun 13 18:22:27 UTC 2022
On Mon, 13 Jun 2022, Brie wrote:
> Who knows... Hard to know if I'm taking a different network path or just
> going through the same routers but bypassing whatever is blocking the
> packets.
You might be able to infer that from the hops that show up in traceroutes.
> I went so far as to even randomize source/dest ports on each end in case it
> was some sort of misguided filtering (ie: port 12345 -> 54321 instead of
> 12345 -> 12345).
That really makes it odd. If you tried changing the src/dst ports with
v4, and your VPN traffic still would not pass, but iperf would, what kind
of filtering/breakage could CL or Comcast have that would just stop your
VPN traffic regardless of ports?
I wonder if this is a misguided/misbhaving filter rule, or something
actually broken eating your packets. Having dealt with something far
stranger many years ago, I totally get the aspects of "big telco can't
help / won't let you even talk to someone who can understand your
explanation of the issue" and "I don't care how I solve this, as long as I
can make the issue go away."
----------------------------------------------------------------------
Jon Lewis, MCP :) | I route
StackPath, Sr. Neteng | therefore you are
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