linux真机系统连了wifi但上不了网？

Posted 2021-08-15 Tuki_a

今天开机后连接自己的wifi，发现不能上网，删除了几个wifi的网卡配置文件重启了几次还是不行。
逐一排查：
先查看下网关

[root@foundation26 ～]# route -n
可以看到本来是应该路由到我wifi的192的网关，但现在首先是路由到172这个网关上了，那自然是上不了网的！

上面说明我的主机会自动给我添加静态网关，我先手动把他删掉

[root@foundation26 html]# route del default gw 172.25.254.254
[root@foundation26 html]# route -n

然后到配置文件删除静态网关route-br0

[root@foundation26 html]# cd /etc/sysconfig/network-scripts/
[root@foundation26 network-scripts]# ls
ifcfg-br0            ifcfg-westoslinux         keys-Hello,world！
ifcfg-enp0s25        ifcfg-Wired_connection_1  keys-westoslinux
ifcfg-Hello,world！  ifcfg-Wired_connection_2  route-br0
[root@foundation26 network-scripts]# cat route-br0 
172.25.0.0/16 via 172.25.254.254
[root@foundation26 network-scripts]# rm -f route-br0

查看ip可以看到enp0s25有线网卡有ip，本来应该没ip的，桥接出去了，但现在有线网卡有ip说明桥接有问题（wlp3s0是无线网卡）

[root@foundation26 network-scripts]# ip addr
2: enp0s25: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:21:cc:65:b4:fc brd ff:ff:ff:ff:ff:ff
    inet 172.25.254.231/24 brd 172.25.254.255 scope global dynamic noprefixroute enp0s25
       valid_lft 100sec preferred_lft 100sec
    inet6 fe80::3b4f:f170:1ccc:eb64/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever
3: wlp3s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether a0:88:b4:c6:6d:0c brd ff:ff:ff:ff:ff:ff
    inet 192.168.92.27/24 brd 192.168.92.255 scope global dynamic noprefixroute wlp3s0
       valid_lft 2322sec preferred_lft 2322sec
    inet6 2409:8970:b20:56a3:307a:d63d:5d8a:75ef/64 scope global dynamic noprefixroute 
       valid_lft 3393sec preferred_lft 3393sec
    inet6 fe80::70c4:f917:1607:cc5e/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever

看下现有连接，多余的down掉并删掉

[root@foundation26 network-scripts]# nmcli connection  show
NAME                UUID                                  TYPE      DEVICE     
Bridge br0          d2d68553-f97e-7549-7a26-b34a26f29318  bridge    br0        
Hello,world！       a0a08aec-db1c-48a3-9bcf-b704b58fa67b  wifi      wlp3s0     
privbr0             a71ea69f-60f8-4f8a-a3d2-6890633353d7  bridge    privbr0    
virbr0              5d78ae2a-bbfe-4f73-ae4b-0894eb593f26  bridge    virbr0     
virbr1              2adf777b-6853-47cd-983c-7df7f3e68319  bridge    virbr1     
virbr1-nic          8576c357-6c59-4eb9-b22c-168c0258c6a4  tun       virbr1-nic 
vnet0               c8bf288c-bc4a-4d83-9d6b-c6a36706e330  tun       vnet0      
vnet1               65738d6a-d9a3-4715-921d-cc6fd4185cf3  tun       vnet1      
Wired connection 2  31f046b5-7056-4e8a-a965-0e5ba1f30624  ethernet  enp0s25    
System enp0s25      939b168c-2e8b-4fd3-bdb8-35b1324832e8  ethernet  --         
westoslinux         9939cf35-f0f8-43db-bf4d-8c9ea65a0802  wifi      --         
Wired connection 1  4b8a6f41-a9d9-4d3c-a544-2bf8c9cb2e6f  ethernet  --      

[root@foundation26 network-scripts]# nmcli connection  down Wired\\ connection\\ 2 
Connection 'Wired connection 2' successfully deactivated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/11)
[root@foundation26 network-scripts]# nmcli connection  delete Wired\\ connection\\ 2 
Connection 'Wired connection 2' (31f046b5-7056-4e8a-a965-0e5ba1f30624) successfully deleted.
[root@foundation26 network-scripts]# nmcli connection  delete Wired\\ connection\\ 1 
Connection 'Wired connection 1' (4b8a6f41-a9d9-4d3c-a544-2bf8c9cb2e6f) successfully deleted.
[root@foundation26 network-scripts]# nmcli connection  delete westoslinux 
Connection 'westoslinux' (9939cf35-f0f8-43db-bf4d-8c9ea65a0802) successfully deleted.
[root@foundation26 network-scripts]# ls
ifcfg-br0  ifcfg-enp0s25  ifcfg-Hello,world！  keys-Hello,world！
## 现在连接环境就比较干净了，只剩下了我的wifi和桥接以及网卡配置

再查看ip如下显示已经桥接到br0上了，恢复正常

[root@foundation26 network-scripts]# ip addr
2: enp0s25: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel master br0 state UP group default qlen 1000
    link/ether 00:21:cc:65:b4:fc brd ff:ff:ff:ff:ff:ff

然后测试，百度可以ping通，网关、网桥、域名解析、网桥配置文件ifcfg-br0都没有问题

[root@foundation26 network-scripts]# bridge link
2: enp0s25: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 master br0 state forwarding priority 32 cost 100 
6: privbr0-nic: <BROADCAST,MULTICAST> mtu 1500 master privbr0 state disabled priority 32 cost 100 
8: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 master virbr0 state disabled priority 32 cost 100 
10: virbr1-nic: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 master virbr1 state disabled priority 32 cost 100 
11: vnet0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 master br0 state forwarding priority 32 cost 100 
12: vnet1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 master br0 state forwarding priority 32 cost 100 
[root@foundation26 network-scripts]# ping baidu.com
PING baidu.com (39.156.69.79) 56(84) bytes of data.
64 bytes from 39.156.69.79 (39.156.69.79): icmp_seq=1 ttl=50 time=37.8 ms
^C
--- baidu.com ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 37.795/37.795/37.795/0.000 ms
[root@foundation26 network-scripts]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.92.239  0.0.0.0         UG    600    0        0 wlp3s0
172.25.0.0      172.25.254.254  255.255.0.0     UG    425    0        0 br0
172.25.26.0     0.0.0.0         255.255.255.0   U     425    0        0 br0
172.25.250.0    0.0.0.0         255.255.255.0   U     0      0        0 privbr0
172.25.254.0    0.0.0.0         255.255.255.0   U     425    0        0 br0
192.168.92.0    0.0.0.0         255.255.255.0   U     600    0        0 wlp3s0
192.168.122.0   0.0.0.0         255.255.255.0   U     0      0        0 virbr0
[root@foundation26 network-scripts]# cat /etc/resolv.conf 
# Generated by NetworkManager
search ilt.example.com example.com
nameserver 2409:8970:b20:56a3::92
nameserver 192.168.92.239
nameserver 172.25.254.250

至此问题解决！