nanog mailing list archives
Re: [Story] When IPv6 Fixes IPv4 Peering Issues
From: Jon Lewis <jlewis () lewis org>
Date: Mon, 13 Jun 2022 14:22:27 -0400 (EDT)
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 _________ http://www.lewis.org/~jlewis/pgp for PGP public key_________
Current thread:
- [Story] When IPv6 Fixes IPv4 Peering Issues Brielle (Jun 13)
- Re: [Story] When IPv6 Fixes IPv4 Peering Issues Jared Mauch (Jun 13)
- Re: [Story] When IPv6 Fixes IPv4 Peering Issues Christopher Morrow (Jun 13)
- Re: [Story] When IPv6 Fixes IPv4 Peering Issues Brie (Jun 13)
- Re: [Story] When IPv6 Fixes IPv4 Peering Issues Jon Lewis (Jun 13)
- Re: [Story] When IPv6 Fixes IPv4 Peering Issues Brie (Jun 13)
- Re: [Story] When IPv6 Fixes IPv4 Peering Issues Christopher Morrow (Jun 13)
- Re: [Story] When IPv6 Fixes IPv4 Peering Issues Jared Mauch (Jun 13)
- Re: [Story] When IPv6 Fixes IPv4 Peering Issues Randy Bush (Jun 13)