$NetBSD$

--- net/socket/tcp_socket_posix.cc.orig	2020-07-15 18:56:00.000000000 +0000
+++ net/socket/tcp_socket_posix.cc
@@ -88,6 +88,17 @@ bool SetTCPKeepAlive(int fd, bool enable
     PLOG(ERROR) << "Failed to set TCP_KEEPALIVE on fd: " << fd;
     return false;
   }
+#elif defined(OS_BSD)
+  // Set seconds until first TCP keep alive.
+  if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPIDLE, &delay, sizeof(delay))) {
+    PLOG(ERROR) << "Failed to set TCP_KEEPIDLE on fd: " << fd;
+    return false;
+  }
+  // Set seconds between TCP keep alives.
+  if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPINTVL, &delay, sizeof(delay))) {
+    PLOG(ERROR) << "Failed to set TCP_KEEPINTVL on fd: " << fd;
+    return false;
+  }
 #endif
   return true;
 }