搬瓦工ubuntu network is unreachable 解决
date
May 6, 2022
slug
fix-bandwagon-snapshot-network-unreachable
status
Published
summary
小技巧
tags
tip
type
Post
URL
Problem & Summary
Solution
traceroute www.google.com
traceroute中第一跳地址会是网关,直接提示network is unreachable可能是网关都不可达?
ip -4 route show
route
copy 一份 /etc/sysctl.conf
iptables -F; iptables -t nat -F; iptables-save > /etc/iptables.up.rules
# network config; 改成静态试试
vi /etc/network/interfaces
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet dhcp
auto eth1
iface eth1 inet dhcp
=>
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet static
address 123.123.123.8 # 需要替换成自己的 IP 地址
netmask 255.255.255.0
gateway 123.123.123.1 # 需要替换,把自己的 IP 地址前三位保持不变,最后一位变成 1
dns-nameservers 8.8.8.8
# dns
vim /etc/resolv.conf
nameserver 8.8.8.8
# 增加默认网关
route add default gw 80.251.216.1
ip addr flush eth0
systemctl restart networking.service
/etc/init.d/networking restart
bwh5g5t正常snapshot上面的文件
bwh5g5t at ~ ❯ ip -4 route show
default via 80.251.216.1 dev eth0
80.251.216.0/22 dev eth0 proto kernel scope link src 80.251.216.70
172.17.0.0/16 dev docker0 proto kernel scope link src 172.17.0.1
172.18.0.0/16 dev br-b7bc5234bbce proto kernel scope link src 172.18.0.1
172.19.0.0/16 dev br-134f1a8d02c7 proto kernel scope link src 172.19.0.1 linkdown
172.20.0.0/16 dev br-363b51b8662c proto kernel scope link src 172.20.0.1 linkdown
172.21.0.0/16 dev br-d7970f02384e proto kernel scope link src 172.21.0.1
172.26.0.0/16 dev br-6d397ca820ae proto kernel scope link src 172.26.0.1
192.168.64.0/20 dev br-08a11445b486 proto kernel scope link src 192.168.64.1
192.168.80.0/20 dev br-18f0122ea240 proto kernel scope link src 192.168.80.1
192.168.176.0/20 dev br-17c05cc0cc4a proto kernel scope link src 192.168.176.1
bwh5g5t at ~ ❯ route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default 80.251.216.1.16 0.0.0.0 UG 0 0 0 eth0
80.251.216.0 0.0.0.0 255.255.252.0 U 0 0 0 eth0
172.17.0.0 0.0.0.0 255.255.0.0 U 0 0 0 docker0
172.18.0.0 0.0.0.0 255.255.0.0 U 0 0 0 br-b7bc5234bbce
172.19.0.0 0.0.0.0 255.255.0.0 U 0 0 0 br-134f1a8d02c7
172.20.0.0 0.0.0.0 255.255.0.0 U 0 0 0 br-363b51b8662c
172.21.0.0 0.0.0.0 255.255.0.0 U 0 0 0 br-d7970f02384e
172.26.0.0 0.0.0.0 255.255.0.0 U 0 0 0 br-6d397ca820ae
192.168.64.0 0.0.0.0 255.255.240.0 U 0 0 0 br-08a11445b486
192.168.80.0 0.0.0.0 255.255.240.0 U 0 0 0 br-18f0122ea240
192.168.176.0 0.0.0.0 255.255.240.0 U 0 0 0 br-17c05cc0cc4a
bwh5g5t at ~ ❯ cat /etc/resolv.conf
nameserver 1.0.0.1
nameserver 8.8.8.8
nameserver 1.1.1.1
nameserver 8.8.4.4
nameserver 74.82.42.42
# ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 80.251.216.70 netmask 255.255.252.0 broadcast 80.251.219.255
inet6 fe80::a8aa:ff:fe17:a7d3 prefixlen 64 scopeid 0x20<link>
ether aa:aa:00:17:a7:d3 txqueuelen 1000 (Ethernet)
RX packets 173117 bytes 404084412 (404.0 MB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 112397 bytes 8125083 (8.1 MB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
eth1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 169.254.254.254 netmask 255.255.255.255 broadcast 169.254.254.254
inet6 fe80::b8aa:ff:fe17:a7d3 prefixlen 64 scopeid 0x20<link>
ether ba:aa:00:17:a7:d3 txqueuelen 1000 (Ethernet)
RX packets 4 bytes 1368 (1.3 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 15 bytes 2234 (2.2 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
bwh2g2t
bwh2g2t at ~ ❯ route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default 80.251.212.1.16 0.0.0.0 UG 0 0 0 eth0
80.251.212.0 0.0.0.0 255.255.252.0 U 0 0 0 eth0
172.17.0.0 0.0.0.0 255.255.0.0 U 0 0 0 docker0
172.18.0.0 0.0.0.0 255.255.0.0 U 0 0 0 br-0bd2c5e99592
172.21.0.0 0.0.0.0 255.255.0.0 U 0 0 0 br-d7970f02384e
172.26.0.0 0.0.0.0 255.255.0.0 U 0 0 0 br-6d397ca820ae