centos 网络出错怎么办

本来想搭个ivp6隧道，没有成功，反而导致主机无法ping通任何ip，无法连接外网，但是ssh能用

ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 172.17.16.36  netmask 255.255.240.0  broadcast 172.17.31.255
        inet6 fe80::216:3eff:fe0c:88ea  prefixlen 64  scopeid 0x20<link>
        ether 00:16:3e:0c:88:ea  txqueuelen 1000  (Ethernet)
        RX packets 486790  bytes 54829704 (52.2 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 405912  bytes 46244483 (44.1 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0


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 1  (Local Loopback)
        RX packets 127  bytes 11452 (11.1 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 127  bytes 11452 (11.1 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0



route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         172.17.31.253   0.0.0.0         UG    0      0        0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U     1002   0        0 eth0
172.17.16.0     0.0.0.0         255.255.240.0   U     0      0        0 eth0
192.168.1.2     0.0.0.0         255.255.255.255 UH    0      0        0 eth0

ping 60.205.224.56
ping: 60.205.224.56: Name or service not known