RT-Thread-stm32+4g网卡 + eth 使用Lwip的natRT-Thread问答社区

stm32+4g网卡 + eth 使用Lwip的nat

发布于 2024-05-22 08:32:59 浏览：468 订阅该版

使用的正点的f407开发板，rtt5.02, lwip2.1.2, cherryusb1.2.0。主板的USB做主机，想要将4G网卡和eth的包进行相互转发，最终的目的是想对这些包做一些数据处理，，现在的情况是，网是通了，但是网速好慢，可以登录QQ，发文字消息，但是发不了图片，网页刷新不出来。用了iperf单独测速，（目前rndis这边用的是手机）手机到板子这边是能达到4Mbps,eth这边20Mbps。猜想是配置的哪里配置的问题，亦或者是使用了lwip的nat本来就该这样,stm3f4承受不住？没有头绪，以下是配置的代码，希望前辈大佬们给出改进建议和指导意见。

rtconfig.h:

```c
#define RT_LWIP_UDP
#define RT_LWIP_TCP
#define RT_LWIP_RAW
#define RT_MEMP_NUM_NETCONN 8
#define RT_LWIP_PBUF_NUM 128
#define RT_LWIP_RAW_PCB_NUM 4
#define RT_LWIP_UDP_PCB_NUM 8
#define RT_LWIP_TCP_PCB_NUM 8
#define RT_LWIP_TCP_SEG_NUM 40
#define RT_LWIP_TCP_SND_BUF 8196
#define RT_LWIP_TCP_WND 4096
#define RT_LWIP_TCPTHREAD_PRIORITY 10
#define RT_LWIP_TCPTHREAD_MBOX_SIZE 8
#define RT_LWIP_TCPTHREAD_STACKSIZE 2048
#define RT_LWIP_ETHTHREAD_PRIORITY 12
#define RT_LWIP_ETHTHREAD_STACKSIZE 2048
#define RT_LWIP_ETHTHREAD_MBOX_SIZE 8
#define LWIP_NETIF_STATUS_CALLBACK 1
#define LWIP_NETIF_LINK_CALLBACK 1
#define SO_REUSE 1
#define LWIP_SO_RCVTIMEO 1
#define LWIP_SO_SNDTIMEO 1
#define LWIP_SO_RCVBUF 1
#define LWIP_SO_LINGER 0
#define LWIP_NETIF_LOOPBACK 0
#define RT_LWIP_USING_PING

```

usb_config.h:

```c
/*
 * Copyright (c) 2022, sakumisu
 *
 * SPDX-License-Identifier: Apache-2.0
 */
#ifndef CHERRYUSB_CONFIG_H
#define CHERRYUSB_CONFIG_H
#include "rtthread.h"
#define CHERRYUSB_VERSION     0x010200
#define CHERRYUSB_VERSION_STR "v1.2.0"

/* ================ USB common Configuration ================ */

#define CONFIG_USB_PRINTF(...) rt_kprintf(__VA_ARGS__)

#define usb_malloc(size) rt_malloc(size)
#define usb_free(ptr)    rt_free(ptr)

#ifndef CONFIG_USB_DBG_LEVEL
#define CONFIG_USB_DBG_LEVEL USB_DBG_ERROR
#endif

/* Enable print with color */
#define CONFIG_USB_PRINTF_COLOR_ENABLE

/* data align size when use dma */
#ifndef CONFIG_USB_ALIGN_SIZE
#define CONFIG_USB_ALIGN_SIZE 4
#endif

/* attribute data into no cache ram */
#define USB_NOCACHE_RAM_SECTION __attribute__((section(".noncacheable")))

/* ================= USB Device Stack Configuration ================ */

/* Ep0 in and out transfer buffer */
#ifndef CONFIG_USBDEV_REQUEST_BUFFER_LEN
#define CONFIG_USBDEV_REQUEST_BUFFER_LEN 512
#endif

/* Setup packet log for debug */
// #define CONFIG_USBDEV_SETUP_LOG_PRINT

/* Send ep0 in data from user buffer instead of copying into ep0 reqdata
 * Please note that user buffer must be aligned with CONFIG_USB_ALIGN_SIZE
*/
// #define CONFIG_USBDEV_EP0_INDATA_NO_COPY

/* Check if the input descriptor is correct */
// #define CONFIG_USBDEV_DESC_CHECK

/* Enable test mode */
// #define CONFIG_USBDEV_TEST_MODE

#ifndef CONFIG_USBDEV_MSC_MAX_LUN
#define CONFIG_USBDEV_MSC_MAX_LUN 1
#endif

#ifndef CONFIG_USBDEV_MSC_MAX_BUFSIZE
#define CONFIG_USBDEV_MSC_MAX_BUFSIZE 512
#endif

#ifndef CONFIG_USBDEV_MSC_MANUFACTURER_STRING
#define CONFIG_USBDEV_MSC_MANUFACTURER_STRING ""
#endif

#ifndef CONFIG_USBDEV_MSC_PRODUCT_STRING
#define CONFIG_USBDEV_MSC_PRODUCT_STRING ""
#endif

#ifndef CONFIG_USBDEV_MSC_VERSION_STRING
#define CONFIG_USBDEV_MSC_VERSION_STRING "0.01"
#endif

// #define CONFIG_USBDEV_MSC_THREAD

#ifndef CONFIG_USBDEV_MSC_PRIO
#define CONFIG_USBDEV_MSC_PRIO 4
#endif

#ifndef CONFIG_USBDEV_MSC_STACKSIZE
#define CONFIG_USBDEV_MSC_STACKSIZE 2048
#endif

#ifndef CONFIG_USBDEV_RNDIS_RESP_BUFFER_SIZE
#define CONFIG_USBDEV_RNDIS_RESP_BUFFER_SIZE 156
#endif

/* rndis transfer buffer size, must be a multiple of (1536 + 44)*/
#ifndef CONFIG_USBDEV_RNDIS_ETH_MAX_FRAME_SIZE
#define CONFIG_USBDEV_RNDIS_ETH_MAX_FRAME_SIZE 1580
#endif

#ifndef CONFIG_USBDEV_RNDIS_VENDOR_ID
#define CONFIG_USBDEV_RNDIS_VENDOR_ID 0x0000ffff
#endif

#ifndef CONFIG_USBDEV_RNDIS_VENDOR_DESC
#define CONFIG_USBDEV_RNDIS_VENDOR_DESC "CherryUSB"
#endif

#define CONFIG_USBDEV_RNDIS_USING_LWIP

/* ================ USB HOST Stack Configuration ================== */

#define CONFIG_USBHOST_MAX_RHPORTS          1
#define CONFIG_USBHOST_MAX_EXTHUBS          1
#define CONFIG_USBHOST_MAX_EHPORTS          4
#define CONFIG_USBHOST_MAX_INTERFACES       8
#define CONFIG_USBHOST_MAX_INTF_ALTSETTINGS 8
#define CONFIG_USBHOST_MAX_ENDPOINTS        4

#define CONFIG_USBHOST_MAX_CDC_ACM_CLASS 4
#define CONFIG_USBHOST_MAX_HID_CLASS     4
#define CONFIG_USBHOST_MAX_MSC_CLASS     2
#define CONFIG_USBHOST_MAX_AUDIO_CLASS   1
#define CONFIG_USBHOST_MAX_VIDEO_CLASS   1

#define CONFIG_USBHOST_DEV_NAMELEN 16

#ifndef CONFIG_USBHOST_PSC_PRIO
#define CONFIG_USBHOST_PSC_PRIO 0
#endif
#ifndef CONFIG_USBHOST_PSC_STACKSIZE
#define CONFIG_USBHOST_PSC_STACKSIZE 2048
#endif

//#define CONFIG_USBHOST_GET_STRING_DESC

// #define CONFIG_USBHOST_MSOS_ENABLE
#ifndef CONFIG_USBHOST_MSOS_VENDOR_CODE
#define CONFIG_USBHOST_MSOS_VENDOR_CODE 0x00
#endif

/* Ep0 max transfer buffer */
#ifndef CONFIG_USBHOST_REQUEST_BUFFER_LEN
#define CONFIG_USBHOST_REQUEST_BUFFER_LEN 512
#endif

#ifndef CONFIG_USBHOST_CONTROL_TRANSFER_TIMEOUT
#define CONFIG_USBHOST_CONTROL_TRANSFER_TIMEOUT 500
#endif

#ifndef CONFIG_USBHOST_MSC_TIMEOUT
#define CONFIG_USBHOST_MSC_TIMEOUT 5000
#endif

/* Because lwip do not support multi pbuf at a time, so increasing this variable has no performance improvement */
#ifndef CONFIG_USBHOST_RNDIS_ETH_MAX_TX_SIZE
#define CONFIG_USBHOST_RNDIS_ETH_MAX_TX_SIZE (1024*8)
#endif

/* This parameter affects usb performance, and depends on (TCP_WND)tcp eceive windows size,
 * you can change to 2K ~ 16K and must be larger than TCP RX windows size in order to avoid being overflow.
 */
#ifndef CONFIG_USBHOST_CDC_NCM_ETH_MAX_RX_SIZE
#define CONFIG_USBHOST_CDC_NCM_ETH_MAX_RX_SIZE (2048)
#endif
/* Because lwip do not support multi pbuf at a time, so increasing this variable has no performance improvement */
#ifndef CONFIG_USBHOST_CDC_NCM_ETH_MAX_TX_SIZE
#define CONFIG_USBHOST_CDC_NCM_ETH_MAX_TX_SIZE (2048)
#endif

/* This parameter affects usb performance, and depends on (TCP_WND)tcp eceive windows size,
 * you can change to 2K ~ 16K and must be larger than TCP RX windows size in order to avoid being overflow.
 */
#ifndef CONFIG_USBHOST_RTL8152_ETH_MAX_RX_SIZE
#define CONFIG_USBHOST_RTL8152_ETH_MAX_RX_SIZE (2048)
#endif
/* Because lwip do not support multi pbuf at a time, so increasing this variable has no performance improvement */
#ifndef CONFIG_USBHOST_RTL8152_ETH_MAX_TX_SIZE
#define CONFIG_USBHOST_RTL8152_ETH_MAX_TX_SIZE (2048)
#endif

#define CONFIG_USBHOST_BLUETOOTH_HCI_H4
// #define CONFIG_USBHOST_BLUETOOTH_HCI_LOG

#ifndef CONFIG_USBHOST_BLUETOOTH_TX_SIZE
#define CONFIG_USBHOST_BLUETOOTH_TX_SIZE 2048
#endif
#ifndef CONFIG_USBHOST_BLUETOOTH_RX_SIZE
#define CONFIG_USBHOST_BLUETOOTH_RX_SIZE 2048
#endif

/* ================ USB Device Port Configuration ================*/

#ifndef CONFIG_USBDEV_MAX_BUS
#define CONFIG_USBDEV_MAX_BUS 1 // for now, bus num must be 1 except hpm ip
#endif

#ifndef CONFIG_USBDEV_EP_NUM
#define CONFIG_USBDEV_EP_NUM 8
#endif

/* ---------------- FSDEV Configuration ---------------- */
//#define CONFIG_USBDEV_FSDEV_PMA_ACCESS 2 // maybe 1 or 2, many chips may have a difference

/* ---------------- DWC2 Configuration ---------------- */
// #define CONFIG_USB_DWC2_RXALL_FIFO_SIZE (1024 / 4)
// #define CONFIG_USB_DWC2_TX0_FIFO_SIZE (64 / 4)
// #define CONFIG_USB_DWC2_TX1_FIFO_SIZE (512 / 4)
// #define CONFIG_USB_DWC2_TX2_FIFO_SIZE (64 / 4)
// #define CONFIG_USB_DWC2_TX3_FIFO_SIZE (64 / 4)
// #define CONFIG_USB_DWC2_TX4_FIFO_SIZE (0 / 4)
// #define CONFIG_USB_DWC2_TX5_FIFO_SIZE (0 / 4)
// #define CONFIG_USB_DWC2_TX6_FIFO_SIZE (0 / 4)
// #define CONFIG_USB_DWC2_TX7_FIFO_SIZE (0 / 4)
// #define CONFIG_USB_DWC2_TX8_FIFO_SIZE (0 / 4)

/* ---------------- MUSB Configuration ---------------- */
// #define CONFIG_USB_MUSB_SUNXI

/* ================ USB Host Port Configuration ==================*/
#ifndef CONFIG_USBHOST_MAX_BUS
#define CONFIG_USBHOST_MAX_BUS 1
#endif

#ifndef CONFIG_USBHOST_PIPE_NUM
#define CONFIG_USBHOST_PIPE_NUM 12
#endif

/* ---------------- EHCI Configuration ---------------- */

#define CONFIG_USB_EHCI_HCCR_OFFSET     (0x0)
#define CONFIG_USB_EHCI_FRAME_LIST_SIZE 1024
#define CONFIG_USB_EHCI_QH_NUM          CONFIG_USBHOST_PIPE_NUM
#define CONFIG_USB_EHCI_QTD_NUM         3
#define CONFIG_USB_EHCI_ITD_NUM         20
// #define CONFIG_USB_EHCI_HCOR_RESERVED_DISABLE
// #define CONFIG_USB_EHCI_CONFIGFLAG
// #define CONFIG_USB_EHCI_ISO
// #define CONFIG_USB_EHCI_WITH_OHCI

/* ---------------- OHCI Configuration ---------------- */
#define CONFIG_USB_OHCI_HCOR_OFFSET (0x0)

/* ---------------- XHCI Configuration ---------------- */
#define CONFIG_USB_XHCI_HCCR_OFFSET (0x0)

/* ---------------- DWC2 Configuration ---------------- */
/* largest non-periodic USB packet used / 4 */
// #define CONFIG_USB_DWC2_NPTX_FIFO_SIZE (512 / 4)
/* largest periodic USB packet used / 4 */
// #define CONFIG_USB_DWC2_PTX_FIFO_SIZE (1024 / 4)
/*
 * (largest USB packet used / 4) + 1 for status information + 1 transfer complete +
 * 1 location each for Bulk/Control endpoint for handling NAK/NYET scenario
 */
// #define CONFIG_USB_DWC2_RX_FIFO_SIZE ((1012 - CONFIG_USB_DWC2_NPTX_FIFO_SIZE - CONFIG_USB_DWC2_PTX_FIFO_SIZE) / 4)

/* ---------------- MUSB Configuration ---------------- */
// #define CONFIG_USB_MUSB_SUNXI

#endif

```
lwipops.h:

```c
/*
 * Copyright (c) 2006-2022, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2022-02-23     Meco Man     integrate v1.4.1 v2.0.3 and v2.1.2 porting layer
 * 2022-02-25     xiangxistu   modify the default config through v1.4.1
 */

#ifndef __LWIPOPTS_H__
#define __LWIPOPTS_H__

#include <rtconfig.h>

/* ---------- LIBC and standard header files ---------- */
#include <limits.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <stdlib.h>
#include <sys/time.h>
#include <sys/errno.h>
#define LWIP_ERRNO_INCLUDE "sys/errno.h"

#define LWIP_TIMEVAL_PRIVATE    0
#define LWIP_NO_UNISTD_H        0
#define LWIP_NO_STDDEF_H        0
#define LWIP_NO_STDINT_H        0
#define LWIP_NO_INTTYPES_H      0
#define LWIP_NO_LIMITS_H        0
#define LWIP_NO_CTYPE_H         0
#define LWIP_SOCKET_SELECT      1
#define LWIP_SOCKET_POLL        1

#define LWIP_RAND rand

#ifndef SSIZE_MAX
#define SSIZE_MAX INT_MAX
#endif

/* some errno not defined in newlib */
#ifndef ENSRNOTFOUND
#define ENSRNOTFOUND 163  /* Domain name not found */
#endif

/* ---------- Basic Configuration ---------- */
#define LWIP_IPV4                   1

#ifdef RT_USING_LWIP_IPV6
#define LWIP_IPV6                   1
#else
#define LWIP_IPV6                   0
#endif /* RT_USING_LWIP_IPV6 */

#define NO_SYS                      0
#define SYS_LIGHTWEIGHT_PROT        1
#define LWIP_SOCKET                 1
#define LWIP_NETCONN                1

#ifdef RT_LWIP_IGMP
#define LWIP_IGMP                   1
#else
#define LWIP_IGMP                   0
#endif

#ifdef RT_LWIP_ICMP
#define LWIP_ICMP                   1
#else
#define LWIP_ICMP                   0
#endif

#ifdef RT_LWIP_SNMP
#define LWIP_SNMP                   1
#else
#define LWIP_SNMP                   0
#endif

#ifdef RT_LWIP_DNS
#define LWIP_DNS                    1
#else
#define LWIP_DNS                    0
#endif

#define LWIP_HAVE_LOOPIF            0

#define LWIP_PLATFORM_BYTESWAP      0

/* #define RT_LWIP_DEBUG */

#ifdef RT_LWIP_DEBUG
#define LWIP_DEBUG
#endif

#define LWIP_DBG_TYPES_ON           (LWIP_DBG_ON|LWIP_DBG_TRACE|LWIP_DBG_STATE|LWIP_DBG_FRESH|LWIP_DBG_HALT)

/* ---------- Memory options ---------- */
#define MEMCPY(dst,src,len)             rt_memcpy(dst,src,len)
#define SMEMCPY(dst,src,len)            MEMCPY(dst,src,len)

#ifdef RT_LWIP_MEM_ALIGNMENT
#define MEM_ALIGNMENT RT_LWIP_MEM_ALIGNMENT
#else
#define MEM_ALIGNMENT               4
#endif

#define MEMP_OVERFLOW_CHECK         1
#define LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT 1

//#define MEM_LIBC_MALLOC             1
//#define MEM_USE_POOLS               1
//#define MEMP_USE_CUSTOM_POOLS       1
//#define MEM_SIZE                    (1024*64)

#define MEMP_MEM_MALLOC             1

/* MEMP_NUM_PBUF: the number of memp struct pbufs. If the application
   sends a lot of data out of ROM (or other static memory), this
   should be set high. */
#define MEMP_NUM_PBUF               32 //16

/* the number of struct netconns */
#ifdef RT_MEMP_NUM_NETCONN
#define MEMP_NUM_NETCONN            RT_MEMP_NUM_NETCONN
#endif

/* the number of UDP protocol control blocks. One per active RAW "connection". */
#ifdef RT_LWIP_RAW_PCB_NUM
#define MEMP_NUM_RAW_PCB            RT_LWIP_RAW_PCB_NUM
#endif

/* the number of UDP protocol control blocks. One per active UDP "connection". */
#ifdef RT_LWIP_UDP_PCB_NUM
#define MEMP_NUM_UDP_PCB            RT_LWIP_UDP_PCB_NUM
#endif

/* the number of simulatenously active TCP connections. */
#ifdef RT_LWIP_TCP_PCB_NUM
#define MEMP_NUM_TCP_PCB            RT_LWIP_TCP_PCB_NUM
#endif

/* the number of simultaneously queued TCP */
#ifdef RT_LWIP_TCP_SEG_NUM
#define MEMP_NUM_TCP_SEG            RT_LWIP_TCP_SEG_NUM
#else
#define MEMP_NUM_TCP_SEG            TCP_SND_QUEUELEN
#endif

/*
 * You can re-define following setting in rtcofnig.h to overwrite the default
 * setting in the lwip opts.h
 */
/* MEMP_NUM_NETBUF: the number of struct netbufs. */
// #define MEMP_NUM_NETBUF             2
/* MEMP_NUM_NETCONN: the number of struct netconns. */
// #define MEMP_NUM_NETCONN            4

/* MEMP_NUM_TCPIP_MSG_*: the number of struct tcpip_msg, which is used
   for sequential API communication and incoming packets. Used in
   src/api/tcpip.c. */
// #define MEMP_NUM_TCPIP_MSG_API      16
// #define MEMP_NUM_TCPIP_MSG_INPKT    16

/* ---------- Pbuf options ---------- */
/* PBUF_POOL_SIZE: the number of buffers in the pbuf pool. */
#ifdef RT_LWIP_PBUF_NUM
#define PBUF_POOL_SIZE               RT_LWIP_PBUF_NUM
#endif

/* PBUF_POOL_BUFSIZE: the size of each pbuf in the pbuf pool. */
#ifdef RT_LWIP_PBUF_POOL_BUFSIZE
#define PBUF_POOL_BUFSIZE            RT_LWIP_PBUF_POOL_BUFSIZE
#endif

/* PBUF_LINK_HLEN: the number of bytes that should be allocated for a
   link level header. */
#define PBUF_LINK_HLEN              16

#ifdef RT_LWIP_ETH_PAD_SIZE
#define ETH_PAD_SIZE                RT_LWIP_ETH_PAD_SIZE
#endif

#ifdef LWIP_USING_NAT
#define IP_NAT                      1
#else
#define IP_NAT                      0
#endif

/* ---------- TCP options ---------- */
#ifdef RT_LWIP_TCP
#define LWIP_TCP                    1
#else
#define LWIP_TCP                    0
#endif

#define TCP_TTL                     255

/* Controls if TCP should queue segments that arrive out of
   order. Define to 0 if your device is low on memory. */
#define TCP_QUEUE_OOSEQ             1

/* TCP Maximum segment size. */
#define TCP_MSS                     1460

/* TCP sender buffer space (bytes). */
#ifdef RT_LWIP_TCP_SND_BUF
#define TCP_SND_BUF                 RT_LWIP_TCP_SND_BUF
#else
#define TCP_SND_BUF                 (TCP_MSS * 2)
#endif

/* TCP sender buffer space (pbufs). This must be at least = 2 *
   TCP_SND_BUF/TCP_MSS for things to work. */
#define TCP_SND_QUEUELEN            (4 * TCP_SND_BUF/TCP_MSS)

/* TCP writable space (bytes). This must be less than or equal
   to TCP_SND_BUF. It is the amount of space which must be
   available in the tcp snd_buf for select to return writable */
#define TCP_SNDLOWAT                (TCP_SND_BUF/2)
#define TCP_SNDQUEUELOWAT           TCP_SND_QUEUELEN/2

/* TCP receive window. */
#ifdef RT_LWIP_TCP_WND
#define TCP_WND                     RT_LWIP_TCP_WND
#else
#define TCP_WND                     (TCP_MSS * 2)
#endif

/* Maximum number of retransmissions of data segments. */
#define TCP_MAXRTX                  12

/* Maximum number of retransmissions of SYN segments. */
#define TCP_SYNMAXRTX               4

/* tcpip thread options */
#ifdef RT_LWIP_TCPTHREAD_PRIORITY
#define TCPIP_MBOX_SIZE             RT_LWIP_TCPTHREAD_MBOX_SIZE
#define TCPIP_THREAD_PRIO           RT_LWIP_TCPTHREAD_PRIORITY
#define TCPIP_THREAD_STACKSIZE      RT_LWIP_TCPTHREAD_STACKSIZE
#else
#define TCPIP_MBOX_SIZE             8
#define TCPIP_THREAD_PRIO           128
#define TCPIP_THREAD_STACKSIZE      4096
#endif
#define TCPIP_THREAD_NAME           "tcpip"
#define DEFAULT_TCP_RECVMBOX_SIZE   10

/* ---------- ARP options ---------- */
#define LWIP_ARP                    1
#define ARP_TABLE_SIZE              10
#define ARP_QUEUEING                1

/* ---------- Checksum options ---------- */
#ifdef RT_LWIP_USING_HW_CHECKSUM
#define CHECKSUM_GEN_IP                 0
#define CHECKSUM_GEN_UDP                0
#define CHECKSUM_GEN_TCP                0
#define CHECKSUM_GEN_ICMP               0
#define CHECKSUM_CHECK_IP               0
#define CHECKSUM_CHECK_UDP              0
#define CHECKSUM_CHECK_TCP              0
#define CHECKSUM_CHECK_ICMP             0
#endif

/* ---------- IP options ---------- */
/* Define IP_FORWARD to 1 if you wish to have the ability to forward
   IP packets across network interfaces. If you are going to run lwIP
   on a device with only one network interface, define this to 0. */
#define IP_FORWARD                  0

/* IP reassembly and segmentation.These are orthogonal even
 * if they both deal with IP fragments */
#ifdef RT_LWIP_REASSEMBLY_FRAG
#define IP_REASSEMBLY               1
#define IP_FRAG                     1
#define IP_REASS_MAX_PBUFS          10
#define MEMP_NUM_REASSDATA          10
#else
#define IP_REASSEMBLY               0
#define IP_FRAG                     0
#endif

/* ---------- ICMP options ---------- */
#define ICMP_TTL                    255

/* ---------- DHCP options ---------- */
/* Define LWIP_DHCP to 1 if you want DHCP configuration of
   interfaces. */
#ifdef RT_LWIP_DHCP
#define LWIP_DHCP                   1
#else
#define LWIP_DHCP                   0
#endif

/* 1 if you want to do an ARP check on the offered address
   (recommended). */
#define DHCP_DOES_ARP_CHECK         (LWIP_DHCP)

/* ---------- AUTOIP options ------- */
#define LWIP_AUTOIP                 0
#define LWIP_DHCP_AUTOIP_COOP       (LWIP_DHCP && LWIP_AUTOIP)

/* ---------- UDP options ---------- */
#ifdef RT_LWIP_UDP
#define LWIP_UDP                    1
#else
#define LWIP_UDP                    0
#endif

#define LWIP_UDPLITE                0
#define UDP_TTL                     255
#define DEFAULT_UDP_RECVMBOX_SIZE   1

/* ---------- RAW options ---------- */
#ifdef RT_LWIP_RAW
#define LWIP_RAW                    1
#else
#define LWIP_RAW                    0
#endif

#define DEFAULT_RAW_RECVMBOX_SIZE   1
#define DEFAULT_ACCEPTMBOX_SIZE     10

/* ---------- Statistics options ---------- */
#ifdef RT_LWIP_STATS
#define LWIP_STATS                  1
#define LWIP_STATS_DISPLAY          1
#else
#define LWIP_STATS                  0
#endif

#if LWIP_STATS
#define LINK_STATS                  1
#define IP_STATS                    1
#define ICMP_STATS                  1
#define IGMP_STATS                  1
#define IPFRAG_STATS                1
#define UDP_STATS                   1
#define TCP_STATS                   1
#define MEM_STATS                   1
#define MEMP_STATS                  1
#define PBUF_STATS                  1
#define SYS_STATS                   1
#define MIB2_STATS                  1
#endif /* LWIP_STATS */

/* ---------- PPP options ---------- */
#ifdef RT_LWIP_PPP
#define PPP_SUPPORT                 1      /* Set > 0 for PPP */
#else
#define PPP_SUPPORT                 0      /* Set > 0 for PPP */
#endif

#if PPP_SUPPORT
#define NUM_PPP                     1      /* Max PPP sessions. */

/* Select modules to enable.  Ideally these would be set in the makefile but
 * we're limited by the command line length so you need to modify the settings
 * in this file.
 */
#ifdef RT_LWIP_PPPOE
#define PPPOE_SUPPORT               1
#else
#define PPPOE_SUPPORT               0
#endif

#ifdef RT_LWIP_PPPOS
#define PPPOS_SUPPORT               1
#else
#define PPPOS_SUPPORT               0
#endif

#define PAP_SUPPORT                 1      /* Set > 0 for PAP. */
#define CHAP_SUPPORT                1      /* Set > 0 for CHAP. */
#define MSCHAP_SUPPORT              0      /* Set > 0 for MSCHAP (NOT FUNCTIONAL!) */
#define CBCP_SUPPORT                0      /* Set > 0 for CBCP (NOT FUNCTIONAL!) */
#define CCP_SUPPORT                 0      /* Set > 0 for CCP (NOT FUNCTIONAL!) */
#define VJ_SUPPORT                  1      /* Set > 0 for VJ header compression. */
#define MD5_SUPPORT                 1      /* Set > 0 for MD5 (see also CHAP) */

#endif /* PPP_SUPPORT */

/**
 * LWIP_POSIX_SOCKETS_IO_NAMES==1: Enable POSIX-style sockets functions names.
 * Disable this option if you use a POSIX operating system that uses the same
 * names (read, write & close). (only used if you use sockets.c)
 */
#ifndef LWIP_POSIX_SOCKETS_IO_NAMES
#define LWIP_POSIX_SOCKETS_IO_NAMES     0
#endif

/**
 * LWIP_TCP_KEEPALIVE==1: Enable TCP_KEEPIDLE, TCP_KEEPINTVL and TCP_KEEPCNT
 * options processing. Note that TCP_KEEPIDLE and TCP_KEEPINTVL have to be set
 * in seconds. (does not require sockets.c, and will affect tcp.c)
 */
#ifndef LWIP_TCP_KEEPALIVE
#define LWIP_TCP_KEEPALIVE              1
#endif

/**
 * LWIP_NETIF_HOSTNAME==1: Support netif hostname
 */
#ifndef LWIP_NETIF_HOSTNAME
#define LWIP_NETIF_HOSTNAME             1
#endif

/**
 * LWIP_NETIF_API==1: Support netif api (in netifapi.c)
 */
#ifndef LWIP_NETIF_API
#define LWIP_NETIF_API                  1
#endif

/* MEMP_NUM_SYS_TIMEOUT: the number of simulateously active timeouts. */
#define MEMP_NUM_SYS_TIMEOUT       (LWIP_TCP + IP_REASSEMBLY + LWIP_ARP + (2*LWIP_DHCP) + LWIP_AUTOIP + LWIP_IGMP + LWIP_DNS + PPP_SUPPORT + (LWIP_IPV6 ? (1 + (2*LWIP_IPV6)) : 0))

/*
 * LWIP_COMPAT_SOCKETS==1: Enable BSD-style sockets functions names.
 * (only used if you use sockets.c)
 */
#ifdef SAL_USING_POSIX
#define LWIP_COMPAT_SOCKETS             0
#else
#ifndef LWIP_COMPAT_SOCKETS
#define LWIP_COMPAT_SOCKETS             1
#endif
#endif

/**
 * LWIP_SO_SNDTIMEO==1: Enable send timeout for sockets/netconns and
 * SO_SNDTIMEO processing.
 */
#ifndef LWIP_SO_SNDTIMEO
#define LWIP_SO_SNDTIMEO                1
#endif

/**
 * LWIP_SO_RCVTIMEO==1: Enable receive timeout for sockets/netconns and
 * SO_RCVTIMEO processing.
 */
#ifndef LWIP_SO_RCVTIMEO
#define LWIP_SO_RCVTIMEO                1
#endif

/**
 * LWIP_SO_RCVBUF==1: Enable SO_RCVBUF processing.
 */
#ifndef LWIP_SO_RCVBUF
#define LWIP_SO_RCVBUF                  1
#endif

/**
 * If LWIP_SO_RCVBUF is used, this is the default value for recv_bufsize.
 */
#ifndef RECV_BUFSIZE_DEFAULT
#define RECV_BUFSIZE_DEFAULT            8192
#endif

/**
 * SO_REUSE==1: Enable SO_REUSEADDR option.
 */
#ifndef SO_REUSE
#define SO_REUSE                        0
#endif

#if RT_USING_LWIP_VER_NUM >= 0x20000 /* >= v2.0.0 */
#if RT_USING_LWIP_VER_NUM < 0x20102  /* >= v2.0.0 && < v2.1.2 */
#define LWIP_HOOK_IP4_ROUTE_SRC(dest, src)  lwip_ip4_route_src(dest, src)
#else                                /* >= v2.1.2 */
#define LWIP_HOOK_IP4_ROUTE_SRC(src, dest)  lwip_ip4_route_src(dest, src)
#endif
#endif /* RT_USING_LWIP_VER_NUM >= 0x20000 */

#endif /* __LWIPOPTS_H__ */

```

此外nat使用的是lwip的nat,在ip4.c加入了nat的代码

![01fa07d8348c2b0e3856fcfc6a77cbaf.png](https://oss-club.rt-thread.org/uploads/20240522/01fa07d8348c2b0e3856fcfc6a77cbaf.png)

![32ad778b992262505327762561ae895b.png](https://oss-club.rt-thread.org/uploads/20240522/32ad778b992262505327762561ae895b.png)