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How do you set a CIDR/IP so anyone can access it from anywhere? I'm trying to make my AWS RDS DB instance accessible from anywhere as my ISP doesn't give me a static IP. Everytime my IP changes I h...
it depends on your networking mode. If you use awsvpc mode, then each task will have its own ip. A tool can be used to calculate CIDR counts: https://cidr.xyz/ To select appropriate IPs, you need to check the CIDR range of your VPC and your security group.
From what I understand, that means first 28 bits are associated with network address while the rest 4 bits are host addresses. That would result in following IP range: 10.88.135.10010000 - 10.88.135.10011111. The first IP should be 10.88.135.144 and last IP address should be 10.88.135.159. But according to cidr.xyz.
The link cidr.xyz is helpful to find IP range of a CIDR format. The example I explained says, total number of host is 256. I am looking for a calculation or a link so that I can find a CIDR having total number of host is 15 in its IP range. I hope I explained well. Okay. For 256 hosts, I believe, its 2⁸ = 2×2×2×2×2×2×2×2 = 256.
If not, you could delete the subnet and recreate it with a smaller range. Failing that, you can add more IP addresses to the VPC by going to the VPC in the management console and choosing Actions / Edit CIDRs. You can add an additional range, such as 172.30.0.0/16. Then you could create new subnets like 172.30.0.0/24 and 172.30.1.0/24.
I know it's a common question, but all the existing answers don't work in my case. I'm trying to create a subnet on AWS and the current VPC CIDR is 172.31.0.0/16 Then when I'm entering 10.0.0.0/28 ...
You are starting with a VPC 10.0.0.0/22. You are correct in that the valid addressing range is 10.0.0.0 -> 10.0.3.255. Now you want to create a subnet from this VPC using /28 CIDR blocks. /28 means the last four bits are 0 to give you the range 0 -> 15. CIDR blocks must always begin on their own boundary. Examples for /28:
Your VPC CIDR block is 26.86.30.192/26.The CIDR block 46.112.183.128/27 that you are trying to allocate to the subnet within the said VPC does not fall within the block 26.86.30.192/26 of that VPC.
3. The issue is that the route in route table was for CIDR range 0.0.0.0/16 which actually resolves to any outbound routes between 0.0.0.0 and 0.0.255.255. The correct route is 0.0.0.0/0 which covers all IPv4 addresses, the route table can then route all outbound traffic to this route assuming there is not any more specific routes.
If you're not familiar with CIDR notation take a look at cidr.xyz, by passing a CIDR in you should get the entire range of IP addresses that it covers. Share Improve this answer