amazon-ec2


Can't ping broadcast addressed in AWS VPC


I want to find all the existed IPs in my subnet on AWS. I use ping -b in my EC2. But there is no response.
$ ifconfig eth0
eth0 Link encap:Ethernet HWaddr 06:8f:a3:06:38:75
inet addr:172.16.33.10 Bcast:172.16.33.255 Mask:255.255.255.0
inet6 addr: fe80::48f:a3ff:fe06:3875/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:9001 Metric:1
RX packets:54018 errors:0 dropped:0 overruns:0 frame:0
TX packets:39295 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:41673791 (41.6 MB) TX bytes:9891811 (9.8 MB)
$ ping -v -b 172.16.33.255
WARNING: pinging broadcast address
PING 172.16.33.255 (172.16.33.255) 56(84) bytes of data.
I have modify the security group and allow all traffic. I wonder AWS forbid the ping -b.
The AWS network does not have broadcast or multicast capability.
Q. Does Amazon VPC support multicast or broadcast?
No.
https://aws.amazon.com/vpc/faqs/
The Ethernet network you see is not what it appears -- it's a software defined network.
See Another Day, Another Billion Packets (YouTube, official AWS) for some solid insights into how the network works.
The official document said "The Amazon VPC don't support multicast nor broadcast."
Q. Does Amazon VPC support multicast or broadcast?
No.

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