如何通过Wifi DNS和互联网访问DHCP客户端

1

我有一台笔记本电脑连接到wifi上网。这台计算机运行Linux（Fedora），它作为另一台（ubuntu linaro）计算机的DHCP服务器，没有wifi适配器。笔记本电脑和另一台计算机通过交叉电缆连接各自的标准以太网端口。所以笔记本电脑是DHCP服务器，其他电脑是DHCP客户端。

我已经验证其他计算机正在从笔记本电脑获取DHCP地址。但是，ping www.yahoo.com不起作用。我还可以在/etc/resolv.confDHCP客户端计算机中看到DHCP服务器中存在正确的设置。

我没有做任何改动iptables。

我的问题是，如何告诉笔记本电脑将DNS请求和互联网访问从dhcp客户端传递到wifi网络？我是否还需要运行DNS守护进程？

[idf@localhost ~]$ cat /proc/sys/net/ipv4/ip_forward 
1

[idf@localhost ~]$

这是笔记本电脑上的ifconfig -a的输出（DHCP服务器）

[idf@localhost ~]$ ifconfig -a
enp1s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.1.1  netmask 255.255.255.0  broadcast 192.168.1.255
        inet6 fe80::28c:faff:feac:2de0  prefixlen 64  scopeid 0x20<link>
        ether 00:8c:fa:ac:2d:e0  txqueuelen 1000  (Ethernet)
        RX packets 899  bytes 123800 (120.8 KiB)
        RX errors 0  dropped 8  overruns 0  frame 0
        TX packets 1338  bytes 131506 (128.4 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device interrupt 16  

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 0  (Local Loopback)
        RX packets 6557  bytes 1142539 (1.0 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 6557  bytes 1142539 (1.0 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

virbr0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        inet 192.168.122.1  netmask 255.255.255.0  broadcast 192.168.122.255
        inet6 fe80::5054:ff:fe0c:77c4  prefixlen 64  scopeid 0x20<link>
        ether 52:54:00:0c:77:c4  txqueuelen 0  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 11  bytes 1174 (1.1 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

virbr0-nic: flags=4098<BROADCAST,MULTICAST>  mtu 1500
        ether 52:54:00:0c:77:c4  txqueuelen 500  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

wlp2s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.128.231.168  netmask 255.255.255.128  broadcast 10.128.231.255
        inet6 fe80::2ae3:47ff:febd:bc4a  prefixlen 64  scopeid 0x20<link>
        ether 28:e3:47:bd:bc:4a  txqueuelen 1000  (Ethernet)
        RX packets 10004803  bytes 10357195255 (9.6 GiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 7473957  bytes 1022964388 (975.5 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

[idf@localhost ~]$

这是我的dhcpd.conf文件

[idf@localhost ~]$ more /etc/dhcp/dhcpd.conf 
ddns-update-style interim;                                   # Required for dhcp 3.0+ / Red Hat 8.0+
ignore client-updates;

subnet 192.168.1.0 netmask 255.255.255.0 {

        range 192.168.1.128 192.168.1.254;                   # Range of IP addresses to be issued to DHCP clients
           option subnet-mask              255.255.255.0;    # Default subnet mask to be used by DHCP clients
           option broadcast-address        192.168.1.255;    # Default broadcastaddress to be used by DHCP clients
           option routers                  192.168.1.1;      # Default gateway to be used by DHCP clients
           option domain-name              "synctrading.org";
           option domain-name-servers      192.168.1.1;           # Default DNS to be used by DHCP clients
           option netbios-name-servers     192.168.1.100;    # Specify a WINS server for MS/Windows clients.
                                                             # (Optional. Specify if used on your network)

#         DHCP requests are not forwarded. Applies when there is more than one ethernet device and forwarding is configured.
#       option ipforwarding off;

        default-lease-time 21600;                            # Amount of time in seconds that a client may keep the IP address
        max-lease-time 43200;

        option time-offset              -18000;              # Eastern Standard Time
#       option ntp-servers              192.168.1.1;         # Default NTP server to be used by DHCP clients
#       option netbios-name-servers     192.168.1.1;
# --- Selects point-to-point node (default is hybrid). Don't change this unless you understand Netbios very well
#       option netbios-node-type 2;
}

[idf@localhost ~]$

编辑1

按照下面的说明（我在dhcpd.conf文件中将名称服务器更改为谷歌dns）后，我做了sudo tcpdump -i enp1s0一台笔记本电脑。然后从DHCP客户端尝试ping www.yahoo.com，在DHCP服务器的转储中打印出一些有趣的东西。"admin prohibited"很有趣，但我不知道它意味着什么或如何解决它。

22:46:31.697964 IP 192.168.1.128.42318 > google-public-dns-a.google.com.domain: 15883+ A? www.yahoo.com. (31)
22:46:31.698068 IP localhost.localdomain > 192.168.1.128: ICMP host google-public-dns-a.google.com unreachable - admin prohibited, length 67
22:46:31.698593 IP 192.168.1.128.56805 > alu7750testscr.xyz1.gblx.mgmt.Level3.net.domain: 15883+ A? www.yahoo.com. (31)
22:46:31.698683 IP localhost.localdomain > 192.168.1.128: ICMP host alu7750testscr.xyz1.gblx.mgmt.Level3.net unreachable - admin prohibited, length 67
22:46:31.699123 IP 192.168.1.128.40441 > google-public-dns-a.google.com.domain: 15883+ A? www.yahoo.com. (31)
22:46:31.699180 IP localhost.localdomain > 192.168.1.128: ICMP host google-public-dns-a.google.com unreachable - admin prohibited, length 67
22:46:31.699598 IP 192.168.1.128.60984 > alu7750testscr.xyz1.gblx.mgmt.Level3.net.domain: 15883+ A? www.yahoo.com. (31)
22:46:36.706262 IP 192.168.1.128.46076 > alu7750testscr.xyz1.gblx.mgmt.Level3.net.domain: 5928+ A? www.yahoo.com.synctrading.org. (47)
22:46:36.706356 IP localhost.localdomain > 192.168.1.128: ICMP host alu7750testscr.xyz1.gblx.mgmt.Level3.net unreachable - admin prohibited, length 83
22:46:36.707346 IP 192.168.1.128.ssh > localhost.localdomain.41245: Flags [P.], seq 1661:1729, ack 576, win 330, options [nop,nop,TS val 35236 ecr 4294953343], length 68
22:46:36.707409 IP localhost.localdomain.41245 > 192.168.1.128.ssh: Flags [.], ack 1729, win 277, options [nop,nop,TS val 4294958364 ecr 35236], length 0
22:46:36.707781 IP 192.168.1.128.ssh > localhost.localdomain.41245: Flags [P.], seq 1729:1765, ack 576, win 330, options [nop,nop,TS val 35236 ecr 4294958364], length 36
22:46:36.707823 IP localhost.localdomain.41245 > 192.168.1.128.ssh: Flags [.], ack 1765, win 277, options [nop,nop,TS val 4294958364 ecr 35236], length 0
22:46:36.710622 IP 192.168.1.128.ssh > localhost.localdomain.41245: Flags [P.], seq 1765:1833, ack 576, win 330, options [nop,nop,TS val 35237 ecr 4294958364], length 68
22:46:36.710663 IP localhost.localdomain.41245 > 192.168.1.128.ssh: Flags [.], ack 1833, win 277, options [nop,nop,TS val 4294958367 ecr 35237], length 0
22:46:46.577998 AoE length 46, Ver 1, Flags: [none]

编辑2

[idf@localhost ~]$ sudo iptables -L -n
[sudo] password for idf: 
Chain INPUT (policy ACCEPT)
target     prot opt source               destination         
ACCEPT     udp  --  0.0.0.0/0            0.0.0.0/0            udp dpt:53
ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0            tcp dpt:53
ACCEPT     udp  --  0.0.0.0/0            0.0.0.0/0            udp dpt:67
ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0            tcp dpt:67
ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0            ctstate RELATED,ESTABLISHED
ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0           
INPUT_direct  all  --  0.0.0.0/0            0.0.0.0/0           
INPUT_ZONES_SOURCE  all  --  0.0.0.0/0            0.0.0.0/0           
INPUT_ZONES  all  --  0.0.0.0/0            0.0.0.0/0           
ACCEPT     icmp --  0.0.0.0/0            0.0.0.0/0           
DROP       all  --  0.0.0.0/0            0.0.0.0/0            ctstate INVALID
REJECT     all  --  0.0.0.0/0            0.0.0.0/0            reject-with icmp-host-prohibited

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination         
ACCEPT     all  --  0.0.0.0/0            192.168.122.0/24     ctstate RELATED,ESTABLISHED
ACCEPT     all  --  192.168.122.0/24     0.0.0.0/0           
ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0           
REJECT     all  --  0.0.0.0/0            0.0.0.0/0            reject-with icmp-port-unreachable
REJECT     all  --  0.0.0.0/0            0.0.0.0/0            reject-with icmp-port-unreachable
ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0            ctstate RELATED,ESTABLISHED
ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0           
FORWARD_direct  all  --  0.0.0.0/0            0.0.0.0/0           
FORWARD_IN_ZONES_SOURCE  all  --  0.0.0.0/0            0.0.0.0/0           
FORWARD_IN_ZONES  all  --  0.0.0.0/0            0.0.0.0/0           
FORWARD_OUT_ZONES_SOURCE  all  --  0.0.0.0/0            0.0.0.0/0           
FORWARD_OUT_ZONES  all  --  0.0.0.0/0            0.0.0.0/0           
ACCEPT     icmp --  0.0.0.0/0            0.0.0.0/0           
DROP       all  --  0.0.0.0/0            0.0.0.0/0            ctstate INVALID
REJECT     all  --  0.0.0.0/0            0.0.0.0/0            reject-with icmp-host-prohibited

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination         
ACCEPT     udp  --  0.0.0.0/0            0.0.0.0/0            udp dpt:68
OUTPUT_direct  all  --  0.0.0.0/0            0.0.0.0/0           

Chain FORWARD_IN_ZONES (1 references)
target     prot opt source               destination         
FWDI_FedoraWorkstation  all  --  0.0.0.0/0            0.0.0.0/0           [goto] 
FWDI_FedoraWorkstation  all  --  0.0.0.0/0            0.0.0.0/0           [goto] 
FWDI_FedoraWorkstation  all  --  0.0.0.0/0            0.0.0.0/0           [goto] 
FWDI_FedoraWorkstation  all  --  0.0.0.0/0            0.0.0.0/0           [goto] 
FWDI_FedoraWorkstation  all  --  0.0.0.0/0            0.0.0.0/0           [goto] 

Chain FORWARD_IN_ZONES_SOURCE (1 references)
target     prot opt source               destination         

Chain FORWARD_OUT_ZONES (1 references)
target     prot opt source               destination         
FWDO_FedoraWorkstation  all  --  0.0.0.0/0            0.0.0.0/0           [goto] 
FWDO_FedoraWorkstation  all  --  0.0.0.0/0            0.0.0.0/0           [goto] 
FWDO_FedoraWorkstation  all  --  0.0.0.0/0            0.0.0.0/0           [goto] 
FWDO_FedoraWorkstation  all  --  0.0.0.0/0            0.0.0.0/0           [goto] 
FWDO_FedoraWorkstation  all  --  0.0.0.0/0            0.0.0.0/0           [goto] 

Chain FORWARD_OUT_ZONES_SOURCE (1 references)
target     prot opt source               destination         

Chain FORWARD_direct (1 references)
target     prot opt source               destination         

Chain FWDI_FedoraWorkstation (5 references)
target     prot opt source               destination         
FWDI_FedoraWorkstation_log  all  --  0.0.0.0/0            0.0.0.0/0           
FWDI_FedoraWorkstation_deny  all  --  0.0.0.0/0            0.0.0.0/0           
FWDI_FedoraWorkstation_allow  all  --  0.0.0.0/0            0.0.0.0/0           

Chain FWDI_FedoraWorkstation_allow (1 references)
target     prot opt source               destination         

Chain FWDI_FedoraWorkstation_deny (1 references)
target     prot opt source               destination         

Chain FWDI_FedoraWorkstation_log (1 references)
target     prot opt source               destination         

Chain FWDO_FedoraWorkstation (5 references)
target     prot opt source               destination         
FWDO_FedoraWorkstation_log  all  --  0.0.0.0/0            0.0.0.0/0           
FWDO_FedoraWorkstation_deny  all  --  0.0.0.0/0            0.0.0.0/0           
FWDO_FedoraWorkstation_allow  all  --  0.0.0.0/0            0.0.0.0/0           

Chain FWDO_FedoraWorkstation_allow (1 references)
target     prot opt source               destination         

Chain FWDO_FedoraWorkstation_deny (1 references)
target     prot opt source               destination         

Chain FWDO_FedoraWorkstation_log (1 references)
target     prot opt source               destination         

Chain INPUT_ZONES (1 references)
target     prot opt source               destination         
IN_FedoraWorkstation  all  --  0.0.0.0/0            0.0.0.0/0           [goto] 
IN_FedoraWorkstation  all  --  0.0.0.0/0            0.0.0.0/0           [goto] 
IN_FedoraWorkstation  all  --  0.0.0.0/0            0.0.0.0/0           [goto] 
IN_FedoraWorkstation  all  --  0.0.0.0/0            0.0.0.0/0           [goto] 
IN_FedoraWorkstation  all  --  0.0.0.0/0            0.0.0.0/0           [goto] 

Chain INPUT_ZONES_SOURCE (1 references)
target     prot opt source               destination         

Chain INPUT_direct (1 references)
target     prot opt source               destination         

Chain IN_FedoraWorkstation (5 references)
target     prot opt source               destination         
IN_FedoraWorkstation_log  all  --  0.0.0.0/0            0.0.0.0/0           
IN_FedoraWorkstation_deny  all  --  0.0.0.0/0            0.0.0.0/0           
IN_FedoraWorkstation_allow  all  --  0.0.0.0/0            0.0.0.0/0           

Chain IN_FedoraWorkstation_allow (1 references)
target     prot opt source               destination         
ACCEPT     udp  --  0.0.0.0/0            224.0.0.251          udp dpt:5353 ctstate NEW
ACCEPT     udp  --  0.0.0.0/0            0.0.0.0/0            udp dpt:137 ctstate NEW
ACCEPT     udp  --  0.0.0.0/0            0.0.0.0/0            udp dpt:138 ctstate NEW
ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0            tcp dpt:22 ctstate NEW
ACCEPT     udp  --  0.0.0.0/0            0.0.0.0/0            udp dpts:1025:65535 ctstate NEW
ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0            tcp dpts:1025:65535 ctstate NEW

Chain IN_FedoraWorkstation_deny (1 references)
target     prot opt source               destination         

Chain IN_FedoraWorkstation_log (1 references)
target     prot opt source               destination         

Chain OUTPUT_direct (1 references)
target     prot opt source               destination         
[idf@localhost ~]$

编辑3

[idf@localhost ~]$ sudo iptables -L -n -t nat
Chain PREROUTING (policy ACCEPT)
target     prot opt source               destination         
PREROUTING_direct  all  --  0.0.0.0/0            0.0.0.0/0           
PREROUTING_ZONES_SOURCE  all  --  0.0.0.0/0            0.0.0.0/0           
PREROUTING_ZONES  all  --  0.0.0.0/0            0.0.0.0/0           

Chain INPUT (policy ACCEPT)
target     prot opt source               destination         

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination         
OUTPUT_direct  all  --  0.0.0.0/0            0.0.0.0/0           

Chain POSTROUTING (policy ACCEPT)
target     prot opt source               destination         
RETURN     all  --  192.168.122.0/24     224.0.0.0/24        
RETURN     all  --  192.168.122.0/24     255.255.255.255     
MASQUERADE  tcp  --  192.168.122.0/24    !192.168.122.0/24     masq ports: 1024-65535
MASQUERADE  udp  --  192.168.122.0/24    !192.168.122.0/24     masq ports: 1024-65535
MASQUERADE  all  --  192.168.122.0/24    !192.168.122.0/24    
POSTROUTING_direct  all  --  0.0.0.0/0            0.0.0.0/0           
POSTROUTING_ZONES_SOURCE  all  --  0.0.0.0/0            0.0.0.0/0           
POSTROUTING_ZONES  all  --  0.0.0.0/0            0.0.0.0/0           
MASQUERADE  all  --  192.168.1.0/24       0.0.0.0/0           

Chain OUTPUT_direct (1 references)
target     prot opt source               destination         

Chain POSTROUTING_ZONES (1 references)
target     prot opt source               destination         
POST_FedoraWorkstation  all  --  0.0.0.0/0            0.0.0.0/0           [goto] 
POST_FedoraWorkstation  all  --  0.0.0.0/0            0.0.0.0/0           [goto] 
POST_FedoraWorkstation  all  --  0.0.0.0/0            0.0.0.0/0           [goto] 
POST_FedoraWorkstation  all  --  0.0.0.0/0            0.0.0.0/0           [goto] 
POST_FedoraWorkstation  all  --  0.0.0.0/0            0.0.0.0/0           [goto] 

Chain POSTROUTING_ZONES_SOURCE (1 references)
target     prot opt source               destination         

Chain POSTROUTING_direct (1 references)
target     prot opt source               destination         

Chain POST_FedoraWorkstation (5 references)
target     prot opt source               destination         
POST_FedoraWorkstation_log  all  --  0.0.0.0/0            0.0.0.0/0           
POST_FedoraWorkstation_deny  all  --  0.0.0.0/0            0.0.0.0/0           
POST_FedoraWorkstation_allow  all  --  0.0.0.0/0            0.0.0.0/0           

Chain POST_FedoraWorkstation_allow (1 references)
target     prot opt source               destination         

Chain POST_FedoraWorkstation_deny (1 references)
target     prot opt source               destination         

Chain POST_FedoraWorkstation_log (1 references)
target     prot opt source               destination         

Chain PREROUTING_ZONES (1 references)
target     prot opt source               destination         
PRE_FedoraWorkstation  all  --  0.0.0.0/0            0.0.0.0/0           [goto] 
PRE_FedoraWorkstation  all  --  0.0.0.0/0            0.0.0.0/0           [goto] 
PRE_FedoraWorkstation  all  --  0.0.0.0/0            0.0.0.0/0           [goto] 
PRE_FedoraWorkstation  all  --  0.0.0.0/0            0.0.0.0/0           [goto] 
PRE_FedoraWorkstation  all  --  0.0.0.0/0            0.0.0.0/0           [goto] 

Chain PREROUTING_ZONES_SOURCE (1 references)
target     prot opt source               destination         

Chain PREROUTING_direct (1 references)
target     prot opt source               destination         

Chain PRE_FedoraWorkstation (5 references)
target     prot opt source               destination         
PRE_FedoraWorkstation_log  all  --  0.0.0.0/0            0.0.0.0/0           
PRE_FedoraWorkstation_deny  all  --  0.0.0.0/0            0.0.0.0/0           
PRE_FedoraWorkstation_allow  all  --  0.0.0.0/0            0.0.0.0/0           

Chain PRE_FedoraWorkstation_allow (1 references)
target     prot opt source               destination         

Chain PRE_FedoraWorkstation_deny (1 references)
target     prot opt source               destination         

Chain PRE_FedoraWorkstation_log (1 references)
target     prot opt source               destination
linux  dns  routing  iptables 
— 伊万
source
但ping -c1 8.8.8.8有效吗？
— MariusMatutiae 2015年
1
这看起来不像DNS问题和路由问题一样多。您是否可以通过Linaro设备访问更广泛的Internet？我的猜测是你的路由器（即adsl调制解调器或同等产品 - 而不是Fedora盒子）不知道如何到达10.128.231.0/25网络 - 或者你需要桥接Fedora盒子上的接口而不是路由它们。
— davidgo 2015年
@davigo，是的，我只是不知道将以太网网卡连接到无线网卡的方法是什么。我看着brctl，但无线不好玩。
— 伊万
@Marius，即使我尝试从dhcp客户端ping一个ip地址，我可以从笔记本电脑ping它不起作用。所以ping 8.8.8.8也不行。
— 伊万
我在Fedora上安装了parprouted并说sudo parprouted enp1s0 wlp2s0，但我仍然无法ping通dhcplient的ip地址。
— Ivan

Answers:

2

更换

domain-name-servers      192.168.1.1;

通过笔记本电脑使用的DNS服务器的地址，或在笔记本电脑上配置DNS缓存服务器。使用nslookup或类似命令host测试客户端上的DNS访问。

您需要使用iptables在笔记本电脑上启用伪装：

iptables -t nat -I POSTROUTING -s 192.168.1.0/24 -o <wifi_interface> -j MASQUERADE

也许您已经使用了一些iptables配置（这不是我的强项）。尝试使用设置nat表的默认策略

iptables -t nat -P PREROUTING ACCEPT
iptables -t nat -P POSTROUTING ACCEPT
iptables -t nat -P OUTPUT ACCEPT

请注意，您始终可以查看使用的接口传递的数据包

sudo tcpdump -i <name_of_interface>

如果您在两个接口上同时执行此操作，您可以看到笔记本电脑丢失或拒绝数据包的位置。

您可能已经配置了iptables的服务，例如fedora上的firewalld。最好尝试使用其配置工具进行任何更改。例如，

firewall-cmd --add-masquerade

但是你还需要为你的以太网建立一个内部或受信任的区域（对不起，我对此不了解更多）。

— meuh
source
即使我尝试从dhcp客户端ping一个我可以从笔记本电脑ping的IP地址，它也不起作用。
— 伊万
@meuth，更加接近!!!! 我能ping ips，但是dns无法正常工作（我还没有更改域名服务器，因为我不知道如何查找）但是，我认为这是从这里开始的。谢谢！
— 伊万
我更改了dhcpd.conf的配置，以添加笔记本电脑连接到wifi时使用的名称服务器。我可以在dhcp客户端的/etc/resolv.conf中看到它们。但是，我不能ping www.yahoo.com但我可以自己ping名称服务器！也许DNS需要类似的iptables条目？
— 伊万2015年
在这里找到这个答案 arstechnica.com/civis/viewtopic.php?f=10&t=1242667 ，不知道如何对我的设置这样做：iptables -A FORWARD -i eth2 -o eth0 -j ACCEPT iptables -A FORWARD -i eth0 -o eth2 -m state --state相关，ESTABLISHED -j ACCEPT
— Ivan
1
meuh，firewalld-cmd命令做到了！我有一个混乱，我需要用我的iptables和firewalld清理。谢谢！！！
— 伊万
0

您的DHCP配置看起来很好。可能是您没有192.168.1.1的DNS解析程序，或者它没有运行dnsmasq服务。你的网关是什么类型的设备？

— Lungten
source
即使我尝试ping从DHCP客户端的IP地址，我可以从它不工作的笔记本电脑ping通
— 伊万
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