src/internal/nettest/conn.go     | 4 ++--
 src/internal/nettest/listener.go | 4 ++--

diff --git a/src/internal/nettest/conn.go b/src/internal/nettest/conn.go
index 4f605f11a718d46d4dda0fa49b7d3e202d4e93e4..15b41d5249f33126e2e0b9a269466682851dcb9c 100644
--- a/src/internal/nettest/conn.go
+++ b/src/internal/nettest/conn.go
@@ -34,8 +34,8 @@
 // NewConnPair returns a pair of connected Conns.
 func NewConnPair() (*Conn, *Conn) {
 	return newConnPair(
-		net.TCPAddrFromAddrPort(netip.MustParseAddrPort("127.0.0.1:10000")),
-		net.TCPAddrFromAddrPort(netip.MustParseAddrPort("127.0.0.1:10001")),
+		net.TCPAddrFromAddrPort(netip.MustParseAddrPort("192.0.2.1:10000")),
+		net.TCPAddrFromAddrPort(netip.MustParseAddrPort("192.0.2.1:10001")),
 	)
 }
 
diff --git a/src/internal/nettest/listener.go b/src/internal/nettest/listener.go
index 12e68182673970313afd4d75d4e9b0d744f5f37d..f3fc39f0b91cb5f6c5ed88f73de0a8b9a7d36569 100644
--- a/src/internal/nettest/listener.go
+++ b/src/internal/nettest/listener.go
@@ -27,8 +27,8 @@ // NewListener returns a new Listener.
 func NewListener() *Listener {
 	return &Listener{
 		gate:     gate.New(false),
-		addr:     net.TCPAddrFromAddrPort(netip.MustParseAddrPort("127.0.0.1:1000")),
-		nextaddr: netip.MustParseAddrPort("127.0.0.1:10001"),
+		addr:     net.TCPAddrFromAddrPort(netip.MustParseAddrPort("192.0.2.1:1000")),
+		nextaddr: netip.MustParseAddrPort("192.0.2.1:10001"),
 	}
 }