okay. let's give this a shot.

utils/he_ipv6/config.py

@@ -233,6 +233,12 @@ class Config(BaseConfig):
             tun_creds_id = tun_xml.attrib['creds']
             creds = self.creds[tun_creds_id]
             update_key = tun_xml.find('updateKey').text.strip()
+            # TODO: do I instead want to use HEConfig() and fetch the single unified config?
+            # Pros:
+            #   * I wouldn't completely die on a misconfigured tunnel in the user config.
+            # Cons:
+            #   * We'd have to skip missing tunnels (bad auth at HE, etc.)
+            #   * We would use more memory and take more time during init.
             he_conf = HETunnelConfig(tun_id, creds, update_key)
             tun = tunnel.Tunnel(tun_xml, he_conf, self.creds[tun_creds_id])
             self.tunnels[tun_id] = tun