diff --git a/storage/discovery.nim b/storage/discovery.nim
index c7f17403..766a2fc0 100644
--- a/storage/discovery.nim
+++ b/storage/discovery.nim
@@ -203,8 +203,8 @@ proc announceDirectAddrs*(
     d.protocol.updateRecord(spr).expect("Should update SPR")
 
 proc announceRelayAddrs*(d: Discovery, addrs: openArray[MultiAddress]) =
-  ## Updates only announce addresses
-  ## When using relay, the DHT routing record is not updated to not pollute the DHT.
+  ## Updates the announce addresses and the SPR with the relay circuit addresses.
+  ## Unlike announceDirectAddrs, no UDP address is derived so dhtAddrs is left untouched.
   d.announceAddrs = @addrs
   info "Updating announce record", addrs = d.announceAddrs
   d.providerRecord = SignedPeerRecord
diff --git a/storage/storage.nim b/storage/storage.nim
index 0dd6bd2f..e27ea988 100644
--- a/storage/storage.nim
+++ b/storage/storage.nim
@@ -48,11 +48,6 @@ import ./utils/natutils
 logScope:
   topics = "storage node"
 
-const StorageTransportFlags = {ServerFlags.ReuseAddr, ServerFlags.TcpNoDelay}
-
-proc tcpTransportBuilder(config: TransportConfig): Transport {.gcsafe, raises: [].} =
-  TcpTransport.new(StorageTransportFlags, config.upgr)
-
 type
   StorageServer* = ref object
     config: StorageConf
@@ -144,8 +139,8 @@ proc start*(s: StorageServer) {.async.} =
 
   await allFutures(findReachableNodes(s.bootstrapNodes).mapIt(connectBootstrapNode(it)))
 
-  # AutoNAT is not in switch.services: start it after the bootstrap dials
-  # so its first probe has peers to ask.
+  # AutoNAT is not in switch.services because we want to start it
+  # after the bootstrap connections to have connected peers for the first probe.
   if s.autonatService.isSome:
     await s.autonatService.get.start(s.storageNode.switch)
 
@@ -238,10 +233,8 @@ proc new*(
     config: StorageConf,
     privateKey: StoragePrivateKey,
     logFile: Option[IoHandle] = IoHandle.none,
-    transportBuilder: TransportBuilder = tcpTransportBuilder,
 ): StorageServer =
   ## create StorageServer including setting up datastore, repostore, etc.
-  ## ``transportBuilder`` defaults to TCP; tests inject a simulated NAT transport.
 
   if err =? config.validateAutonatConfig().errorOption:
     raise newException(StorageError, err.msg)
@@ -324,7 +317,9 @@ proc new*(
     # addresses.
     switchBuilder = switchBuilder.withAddressPolicy(dialableAddressPolicy)
 
-  let switch = switchBuilder.withTransport(transportBuilder).build()
+  let switch = switchBuilder
+    .withTcpTransport({ServerFlags.ReuseAddr, ServerFlags.TcpNoDelay})
+    .build()
 
   var taskPool: Taskpool
 
diff --git a/tests/storage/testnatreaction.nim b/tests/storage/testnatreaction.nim
index 1a6d1e31..13e99ef8 100644
--- a/tests/storage/testnatreaction.nim
+++ b/tests/storage/testnatreaction.nim
@@ -155,12 +155,13 @@ asyncchecksuite "NAT reaction - port mapping":
     check disc.protocol.clientMode
 
   test "handleNatStatus stops relay and exits client mode when mapping is created and node is Reachable":
+    let dialBack = MultiAddress.init("/ip4/1.2.3.4/tcp/8080").expect("valid")
     let mapper = MockNatPortMapper(mappedPorts: none((Port, Port, MappingProtocol)))
 
     disc.protocol.clientMode = true
     autorelayservice.setup(autoRelay, sw)
     await mapper.handleNatStatus(
-      Reachable, Opt.none(MultiAddress), discoveryPort, disc, sw, autoRelay
+      Reachable, Opt.some(dialBack), discoveryPort, disc, sw, autoRelay
     )
 
     check not autoRelay.isRunning