无法在Ubuntu实例上访问AWS VPC中的第二个ENI

你必须做一些高级路由：

1)立即和暂时允许访问第二个ENI.

来源：http://www.rjsystems.nl/en/2100-adv-routing.php

# this will show your route table,i'll assume you have eth0 and eth1
# and your default is for eth0 to point to the gateway
# for this example lets assume the following:
# eth0 = 192.168.100.5 
# eth1 = 192.168.100.10
# gateway = 192.168.100.1
ip route show ;

# first step is to create a routing table for your new device
cat /etc/iproute2/rt_tables ;
echo 2 eth1_rt >> /etc/iproute2/rt_tables ;

# next add the eth1_rt route table,so by default it will also point to the gateway
ip route add default via 192.168.100.1 dev eth1 table eth1_rt ;

# next take a look at your ip rules
# i'll assume the defaults here,and things flows to default with priority 32767
ip rule;

# let's add a rule,if we see traffic from eth1's IP address,# use its new routing table we setup,and give it higher priority than default
ip rule add from 192.168.100.10 lookup eth1_rt prio 1000 ;

# done! Now check your traffic from both IPs,they should both work.

2)在重新启动时启用对第二个ENI的访问但持续访问.

来源：http://blog.bluemalkin.net/multiple-ips-and-enis-on-ec2-in-a-vpc/

此外,如果您希望此更改保持不变,您可以在接口文件中进行所有这些更改,只需重新启动网络服务或重新启动即可使其生效.

# NOTE: add the eth1_rt routing table to /etc/iproute2/rt_tables as show in prevIoUs section

# original config to make dchp,I add mine to /etc/network/interfaces.d/eth1.cfg
auto eth1
iface eth1 inet dchp
    # your extra rules for eth1
    up ip route add default via 192.168.100.1 dev eth1 table eth1_rt
    up ip rule add from 192.168.100.10 lookup eth1_rt prio 1000

要使其完全生效,请重新启动系统.

注意：我试过/etc/init.d/networking restart;但它没有拿起路线/规则的变化,不知道为什么,所以我重启了.如果您想立即使用它,请执行这两种方法.