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如果配置

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如果配置

我无法在 ubuntu 18.04 上 ping 我的默认网关。以下是我的设置的输出：

如果配置

enp12s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 172.30.149.90  netmask 255.255.255.240  broadcast 172.30.149.95

        ether f0:1f:af:3e:73:a3  txqueuelen 1000  (Ethernet)
        RX packets 2005  bytes 154598 (154.5 KB)
        RX errors 0  dropped 380  overruns 0  frame 0
        TX packets 950  bytes 117982 (117.9 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device interrupt 18  

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        loop  txqueuelen 1000  (Boucle locale)
        RX packets 31843  bytes 1932467 (1.9 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 31843  bytes 1932467 (1.9 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

路线-n

Table de routage IP du noyau
Destination     Passerelle      Genmask         Indic Metric Ref    Use Iface
0.0.0.0         172.30.149.94   0.0.0.0         UG    20100  0        0 enp12s0
169.254.0.0     0.0.0.0         255.255.0.0     U     1000   0        0 enp12s0
172.30.149.80   0.0.0.0         255.255.255.240 U     100    0        0 enp12s0

平172.30.149.94

PING 172.30.149.94 (172.30.149.94) 56(84) bytes of data.
From 172.30.149.90 icmp_seq=1 Destination Host Unreachable
From 172.30.149.90 icmp_seq=2 Destination Host Unreachable
From 172.30.149.90 icmp_seq=3 Destination Host Unreachable
^C
--- 172.30.149.94 ping statistics ---
5 packets transmitted, 0 received, +3 errors, 100% packet loss, time 4080ms

猫 /etc/NetworkManager/NetworkManager.conf

[main]
plugins=ifupdown,keyfile
[ifupdown]
managed=false
[device]
wifi.scan-rand-mac-address=no

dhclient -v enp12s0

Internet Systems Consortium DHCP Client 4.3.5
...
Listening on LPF/enp12s0/f0:1f:af:3e:73:a3
Sending on   LPF/enp12s0/f0:1f:af:3e:73:a3
Sending on   Socket/fallback
DHCPDISCOVER on enp12s0 to 255.255.255.255 port 67 interval 3 (xid=0x2d28ac1e)
DHCPDISCOVER on enp12s0 to 255.255.255.255 port 67 interval 5 (xid=0x2d28ac1e)

arp-na

? (172.30.149.92) à <incomplet> sur enp12s0
? (172.30.149.94) à <incomplet> sur enp12s0

ip邻居显示

172.30.149.92 dev enp12s0  FAILED
172.30.149.94 dev enp12s0  FAILED

iptables -L -v -n

Chain INPUT (policy ACCEPT 6000 packets, 368K bytes)
 pkts bytes target     prot opt in     out     source                   destination         

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source                   destination         

Chain OUTPUT (policy ACCEPT 6010 packets, 369K bytes)
 pkts bytes target     prot opt in     out     source                   destination

猫 /etc/resolv.conf

# Dynamic resolv.conf(5) file for glibc resolver(3) generated by     resolvconf(8)
..
# 127.0.0.53 is the systemd-resolved stub resolver.
# run "systemd-resolve --status" to see details about the actual     nameservers.
nameserver 127.0.0.53

IP地址

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group  default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
2: enp12s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP 
group default qlen 1000
    link/ether f0:1f:af:3e:73:a3 brd ff:ff:ff:ff:ff:ff
    inet 172.30.149.90/28 brd 172.30.149.95 scope global noprefixroute     enp12s0
       valid_lft forever preferred_lft forever
3: wlp2s0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group     default qlen 1000
    link/ether 70:18:8b:70:10:4a brd ff:ff:ff:ff:ff:ff

系统控制-p

net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1

iptables -t nat -L -v -n

Chain PREROUTING (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source                       destination         

Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               >destination         

Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source                   destination         

Chain POSTROUTING (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source                   destination

远程登录 172.30.149.94 22

Trying 172.30.149.94...
telnet: Unable to connect to remote host: No route to host

远程登录 172.30.149.94 80

Trying 172.30.149.94...
telnet: Unable to connect to remote host: No route to host

猫 /etc/网络/接口

# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback

iptables-L

Chain INPUT (policy ACCEPT)
target     prot opt source               destination         

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination         

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

tcpdump -v arp

tcpdump: listening on enp12s0, link-type EN10MB (Ethernet), capture size 262144 bytes
13:44:09.289931 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has _gateway tell teltest, length 28
13:44:10.314067 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has _gateway tell teltest, length 28
13:44:14.021038 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 62.201.153.150 tell 62.201.153.145, length 46
13:44:14.021065 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 62.201.153.142 tell 62.201.153.137, length 46
13:44:14.409927 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has _gateway tell teltest, length 28
13:44:15.433950 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has _gateway tell teltest, length 28
13:44:16.457979 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has _gateway tell teltest, length 28
13:44:17.481925 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has _gateway tell teltest, length 28
13:44:18.505913 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has _gateway tell teltest, length 28
13:44:19.021013 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 62.201.153.142 tell 62.201.153.137, length 46

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