问题
- 一个有两张网卡的 EC2 instance (RHEL7.5)，每个网卡分别对应一个public subnet, 每个网卡也关联一个 Public IP.
- 从其他网络 ping 这两个 IP 地址，发现其中一个IP能ping通，另一个IP不能ping通。
[ec2-user@ip-172-31-30-14 ~]$ ping 52.80.82.70 -c2
PING 52.80.82.70 (52.80.82.70) 56(84) bytes of data.
64 bytes from 52.80.82.70: icmp_seq=1 ttl=63 time=1.71 ms
64 bytes from 52.80.82.70: icmp_seq=2 ttl=63 time=1.80 ms
[ec2-user@ip-172-31-30-14 ~]$ ping 52.81.2.166 -c2
PING 52.81.2.166 (52.81.2.166) 56(84) bytes of data.
--- 52.81.2.166 ping statistics ---
2 packets transmitted, 0 received, 100% packet loss, time 1004ms
PING 52.80.82.70 (52.80.82.70) 56(84) bytes of data.
64 bytes from 52.80.82.70: icmp_seq=1 ttl=63 time=1.71 ms
64 bytes from 52.80.82.70: icmp_seq=2 ttl=63 time=1.80 ms
[ec2-user@ip-172-31-30-14 ~]$ ping 52.81.2.166 -c2
PING 52.81.2.166 (52.81.2.166) 56(84) bytes of data.
--- 52.81.2.166 ping statistics ---
2 packets transmitted, 0 received, 100% packet loss, time 1004ms