LWIP TCP连接失败

发布于 2021-02-02 13:38:12 浏览：1528 订阅该版

各位大佬 小弟初学LWIP TCP连接一直失败，从wireshark上也没有抓到包.求大佬帮忙捞下。
```
pbuf_remove_header: old 20016e44 new 20016e正在获取地址...
网卡en的MAC地址为:................2.0.0.44.0.83
通过DHCP获取到IP地址..............10.66.128.62
通过DHCP获取到子网掩码............255.255.252.0
通过DHCP获取到的默认网关..........10.66.128.1
dhcp_release_and_stop()
pbuf_alloc(length=308)
pbuf_alloc(length=308) == 200086f8
transaction id xid(abcd0002)
pbuf_add_header: old 20008740 new 20008738 (8)
udp_send: added header in given pbuf 200086f8
udp_send: sending datagram of length 316
udp_send: UDP packet length 316
udp_send: UDP checksum 0x0000
udp_send: ip_output_if (,,,,0x11,)
pbuf_add_header: old 20008738 new 20008724 (20)
ip4_output_if: en0
IP header:
+-------------------------------+
| 4 | 5 |  0x00 |       336     | (v, hl, tos, len)
+-------------------------------+
|        4      |000|       0   | (id, flags, offset)
+-------------------------------+
|  255  |   17  |    0x0000     | (ttl, proto, chksum)
+-------------------------------+
|   10  |   66  |  128  |   62  | (src)
+-------------------------------+
|  192  |  168  |   26  |  134  | (dest)
+-------------------------------+
ip4_output_if: call netif->output()
etharp_find_entry: found empty entry 1
etharp_find_entry: selecting empty entry 1
etharp_request: sending ARP request.
pbuf_alloc(length=28)
pbuf_alloc(length=28) == 2000887c
etharp_raw: sending raw ARP packet.
pbuf_add_header: old 2000889c new 2000888e (14)
ethernet_output: sending packet 2000887c
pbuf_free(2000887c)
pbuf_free: deallocating 2000887c
etharp_query: queued packet 200086f8 on ARP entry 1
pbuf_free(200086f8)
pbuf_free: 200086f8 has ref 1, ending here.
dhcp_release: RELEASED, DHCP_STATE_OFF
netif_set_ipaddr: netif address being changed
netif: netmask of interface en set to 0.0.0.0
netif: GW address of interface en set to 0.0.0.0
52 (14)
ip_input: iphdr->dest 0xff83420a netif->ip_addr 0x0 (0x0, 0x0, 0xff83420a)
ip4_input: UDP packet to DHCP client port 1947
ip4_input: packet not for us.
pbuf_free(20016e34)
pbuf_free: deallocating 20016e34
pbuf_alloc(length=60)
pbuf_alloc(length=60) == 20016e34
tcpip_thread: PACKET 2000fb00
ethernet_input: dest:ff:ff:ff:ff:ff:ff, src:04:fe:8d:9e:de:0d, type:806
pbuf_remove_header: old 20016848 new 20016856 (14)
etharp_update_arp_entry: 10.66.128.1 - 04:fe:8d:9e:de:0d
etharp_find_entry: found matching entry 1
etharp_update_arp_entry: updating stable entry 1
pbuf_add_header: old 20008724 new 20008716 (14)
ethernet_output: sending packet 200086f8
pbuf_free(200086f8)
pbuf_free: deallocating 200086f8
etharp_input: incoming ARP request
etharp_input: we are unconfigured, ARP request ignored.
pbuf_free(20016838)
pbuf_free: deallocating 20016838
pbuf_alloc(length=60)
pbuf_alloc(length=60) == 20016838
tcpip_thread: PACKET 2000fb00
ethernet_input: dest:ff:ff:ff:ff:ff:ff, src:04:fe:8d:9e:de:0d, type:806
pbuf_remove_header: old 20016e44 new 20016e52 (14)
etharp_update_arp_entry: 10.66.128.1 - 04:fe:8d:9e:de:0d
etharp_find_entry: found matching entry 1
etharp_update_arp_entry: updating stable entry 1
etharp_input: incoming ARP request
etharp_input: we are unconfigured, ARP request ignored.
pbuf_free(20016e34)
pbuf_free: deallocating 20016e34
pbuf_alloc(length=60)
pbuf_alloc(length=60) == 20016e34
tcpip_thread: PACKET 2000fb00
ethernet_input: dest:ff:ff:ff:ff:ff:ff, src:70:b5:e8:38:69:40, type:806
pbuf_remove_header: old 20016848 new 20016856 (14)
etharp_update_arp_entry: 10.66.129.114 - 70:b5:e8:38:69:40
etharp_find_entry: found empty entry 2
etharp_find_entry: no empty entry found and not allowed to recycle
etharp_input: incoming ARP request
etharp_input: we are unconfigured, ARP request ignored.
pbuf_free(20016838)
pbuf_free: deallocating 20016838
sct calling h=ip_reass_tmr t=33 arg=08019090
```
![image.png](https://oss-club.rt-thread.org/uploads/20210202/f5725198a7aeca97669d17fb0b445e68.png)