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diff --git a/extmod/lwip-include/lwipopts_common.h b/extmod/lwip-include/lwipopts_common.h
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+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2025 Damien P. George
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#ifndef MICROPY_INCLUDED_LWIPOPTS_COMMON_H
+#define MICROPY_INCLUDED_LWIPOPTS_COMMON_H
+
+#include "py/mpconfig.h"
+
+// This sys-arch protection is not needed.
+// Ports either protect lwIP code with flags, or run it at PendSV priority.
+#define SYS_ARCH_DECL_PROTECT(lev) do { } while (0)
+#define SYS_ARCH_PROTECT(lev) do { } while (0)
+#define SYS_ARCH_UNPROTECT(lev) do { } while (0)
+
+#define NO_SYS 1
+#define SYS_LIGHTWEIGHT_PROT 1
+#define MEM_ALIGNMENT 4
+
+#define LWIP_CHKSUM_ALGORITHM 3
+#define LWIP_CHECKSUM_CTRL_PER_NETIF 1
+
+#define LWIP_ARP 1
+#define LWIP_ETHERNET 1
+#define LWIP_RAW 1
+#define LWIP_NETCONN 0
+#define LWIP_SOCKET 0
+#define LWIP_STATS 0
+#define LWIP_NETIF_HOSTNAME 1
+
+#define LWIP_DHCP 1
+#define LWIP_DHCP_CHECK_LINK_UP 1
+#define LWIP_DHCP_DOES_ACD_CHECK 0 // to speed DHCP up
+#define LWIP_DNS 1
+#define LWIP_DNS_SUPPORT_MDNS_QUERIES 1
+#define LWIP_MDNS_RESPONDER 1
+#define LWIP_IGMP 1
+
+#if MICROPY_PY_LWIP_PPP
+#define PPP_SUPPORT 1
+#define PAP_SUPPORT 1
+#define CHAP_SUPPORT 1
+#endif
+
+#define LWIP_NUM_NETIF_CLIENT_DATA LWIP_MDNS_RESPONDER
+#define MEMP_NUM_UDP_PCB (4 + LWIP_MDNS_RESPONDER)
+#define MEMP_NUM_SYS_TIMEOUT (LWIP_NUM_SYS_TIMEOUT_INTERNAL + LWIP_MDNS_RESPONDER)
+
+#define SO_REUSE 1
+#define TCP_LISTEN_BACKLOG 1
+
+// TCP memory settings.
+// Default lwIP settings takes 15800 bytes; TCP d/l: 380k/s local, 7.2k/s remote; TCP u/l is very slow.
+#ifndef MEM_SIZE
+
+#if 0
+// lwIP takes 19159 bytes; TCP d/l and u/l are around 320k/s on local network.
+#define MEM_SIZE (5000)
+#define TCP_WND (4 * TCP_MSS)
+#define TCP_SND_BUF (4 * TCP_MSS)
+#endif
+
+#if 1
+// lwIP takes 26700 bytes; TCP dl/ul are around 750/600 k/s on local network.
+#define MEM_SIZE (8000)
+#define TCP_MSS (800)
+#define TCP_WND (8 * TCP_MSS)
+#define TCP_SND_BUF (8 * TCP_MSS)
+#define MEMP_NUM_TCP_SEG (32)
+#endif
+
+#if 0
+// lwIP takes 45600 bytes; TCP dl/ul are around 1200/1000 k/s on local network.
+#define MEM_SIZE (16000)
+#define TCP_MSS (1460)
+#define TCP_WND (8 * TCP_MSS)
+#define TCP_SND_BUF (8 * TCP_MSS)
+#define MEMP_NUM_TCP_SEG (32)
+#endif
+
+#endif // MEM_SIZE
+
+// Needed for PPP.
+#define sys_jiffies sys_now
+
+typedef uint32_t sys_prot_t;
+
+#endif // MICROPY_INCLUDED_LWIPOPTS_COMMON_H