From 83739b3185720d0b2957cf4e3e5e4049d8229482 Mon Sep 17 00:00:00 2001
From: Johnson Lu <johnsonlu@google.com>
Date: Thu, 27 Apr 2023 01:04:18 -0700
Subject: [PATCH] [Connections] Switch to use P2P IPv6 address

PiperOrigin-RevId: 527502244
---
 connections/implementation/proto/offline_wire_formats.proto | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/connections/implementation/proto/offline_wire_formats.proto b/connections/implementation/proto/offline_wire_formats.proto
index 17ecdbaf..4fe839d5 100644
--- a/connections/implementation/proto/offline_wire_formats.proto
+++ b/connections/implementation/proto/offline_wire_formats.proto
@@ -255,6 +255,10 @@ message BandwidthUpgradeNegotiationFrame {
       optional int32 port = 3;
       optional int32 frequency = 4;
       optional string gateway = 5 [default = "0.0.0.0"];
+      // IPv6 link-local address, network order (128bits).
+      // The GO should listen on both IPv4 and IPv6 addresses.
+      // https://en.wikipedia.org/wiki/Link-local_address#IPv6
+      optional bytes ip_v6_address = 6;
     }
 
     // Accompanies Medium.WEB_RTC