From 0049349e849b9726e22b5b5e1b90febebd41af1b Mon Sep 17 00:00:00 2001
From: "Byron Campen [:bwc]" <docfaraday@gmail.com>
Date: Tue, 6 Apr 2021 18:49:48 +0000
Subject: [PATCH] Bug 1702512: Add 53 to the list of allowed ports for webrtc.
 r=mjf

This is sometimes used by deployments that want to work around NATs that
block UDP.

Depends on D110948

Differential Revision: https://phabricator.services.mozilla.com/D110949
---
 dom/media/webrtc/jsapi/MediaTransportHandler.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/dom/media/webrtc/jsapi/MediaTransportHandler.cpp b/dom/media/webrtc/jsapi/MediaTransportHandler.cpp
index 2e0127eac289..f21b9291676b 100644
--- a/dom/media/webrtc/jsapi/MediaTransportHandler.cpp
+++ b/dom/media/webrtc/jsapi/MediaTransportHandler.cpp
@@ -289,6 +289,7 @@ static NrIceCtx::Policy toNrIcePolicy(dom::RTCIceTransportPolicy aPolicy) {
 
 // list of known acceptable ports for webrtc
 int16_t gGoodWebrtcPortList[] = {
+    53,    // Some deplyoments use DNS port to punch through overzealous NATs
     3478,  // stun or turn
     5349,  // stuns or turns
     0,     // Sentinel value: This MUST be zero