Add Ascend.io to USERS.md

[thejosephstevens]

Following up on adding Ascend.io as a user following the case study

cc @xmulligan

Please ensure your pull request adheres to the following guidelines:

• For first time contributors, read Submitting a pull request
• All code is covered by unit and/or runtime tests where feasible.
• All commits contain a well written commit description including a title,
  description and a Fixes: #XXX line if the commit addresses a particular
  GitHub issue.
• All commits are signed off. See the section Developer’s Certificate of Origin
• Are you a user of Cilium? Please add yourself to the Users doc
• Thanks for contributing!

[pchaigno]

Thanks for adding yourself to the list! 🙏

[pchaigno]

I'm guessing Transparent Encryption is with WireGuard, right?

[thejosephstevens]

We actually initially implemented with IPSec, but it looks like we're likely to transition to wireguard soon since the clouds all bumped their kernels to 5.10 with k8s 1.24 (partially because of incompatibility between ip-sec and some other features, I forget if it was cluster mesh or egress gateway that was the forcing function)

[pchaigno]

Thanks for the answer!

partially because of incompatibility between ip-sec and some other features, I forget if it was cluster mesh or egress gateway that was the forcing function

Probably egress gateway because IPsec is incompatible with KPR and egress gateway requires KPR. We're working on removing that limitation for IPsec.

[xmulligan]

Thanks for adding!