CIDR Sheet

Raghavendra Seshumurthy
CIDR NotationTotal Number of AddressesNetwork MaskDescription
/04,29,49,67,2960.0.0.0All Addresses
/12,14,74,83,684128.0.0.0128 /8 networks
/21,07,37,41,824192.0.0.064 /8 networks
/353,68,70,912224.0.0.032 /8 neworks
/426,84,35,456240.0.0.016 /8 networks
/513,42,17,728248.0.0.08 /8 networks
/66,71,08,864252.0.0.04 /8 networks
/73,35,54,432254.0.0.02 /8 networks
/81,67,77,214255.0.0.01 /8 network
/983,88,608255.128.0.0128 /16 networks
/1041,94,304255.192.0.064 /16 networks
/1120,97,152255.224.0.032 /16 networks
/1210,48,576255.240.0.016 /16 networks
/135,24,288255.248.0.08 /16 networks
/142,62,144255.252.0.04 /16 networks
/151,31,072255.254.0.02 /16 networks
/1665536255.255.0.01 /16 network
/1732768255.255.128.0128 /24 networks
/1816384255.255.192.064 /24 networks
/198192255.255.224.032 /24 networks
/204096255.255.240.016 /24 networks
/212048255.255.248.08 /24 networks
/221024255.255.252.04 /24 networks
/23512255.255.254.02/24 networks
/24256255.255.255.01 /24/network
/25128255.255.255.128half of a /24
/2664255.255.255.192fourth of a /24
/2732255.255.255.224eighth of a /24
/2816255.255.255.2401/16th of a /24
/298255.255.255.2486 usable addresses
/304255.255.255.2522 usable addresses
/312255.255.255.254used in P2P links
/321255.255.255.255Single Host

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Azure Resource Mover

Raghavendra Seshumurthy

Definition:

The Azure resource mover is used to move resources from one region to another region.

Advantages:

  • A single hub for moving resources across regions.
  • Reduced move time and complexity.
  • A simple and consistent experience moving different types of Azure resources.
  • An easy way to identify dependencies across resources you want to move. This helps you to move related resources together, so that everything works as expected in the target region, after the move.
  • Automatic cleanup of resources in the source region, if you want to delete them after the move.

Resources which we can move:

  • Azure VMs and associated disks
  • Encrypted Azure VMs and associated disks. This includes VMs with Azure disk encryption enabled, and Azure VMs using default server-side encryption (both with platform-managed keys and customer-managed keys)
  • NICs
  • Availability sets
  • Azure virtual networks
  • Public IP addresses
  • Network security groups (NSGs)
  • Internal and public load balancers
  • Azure SQL databases and elastic pools.

Powershell commands to create Azure Storage Accounts

Raghavendra Seshumurthy

Command1:

Creating Blob Storage :

New-AzureRmStorageAccount -ResourceGroupName sandbox -AccountName raghuseshulab02 -Location centralUS -Kind BlobStorage -SkuName Standard_GRS -AccessTier Hot

Command2:

Creating StorageV2:

New-AzureRmStorageAccount -ResourceGroupName sandbox -AccountName testlab130 -Location centralUS -Kind StorageV2 -SkuName Standard_GRS -AccessTier Hot

Command3:

Creating StorageV1:

New-AzureRmStorageAccount -ResourceGroupName sandbox -AccountName testlab140 -Location centralUS -Kind Storage -SkuName Standard_GRS

Azure VPN Gateway Troubleshooting Steps:

Raghavendra Seshumurthy

  1. Log in to the Azure Portal portal.azure.com
  2. Go to all services > type Virtual network gateway service.
  3. Select virtual gateway, for which we are facing the issue.
  4. Click on VPN troubleshoot.
  5. Start VPN troubleshooting after selecting the VPN gateway
  6. VPN logs will transfer to storage container
  7. Perform a deep analysis of VPN logs
  8. Second troubleshooting step is verifying the VPN gateway health probe using VPN Gateway public IP.

Eg: https://<PublicIP&gt;:8081/healthprobe

9. If you see the xml response then VPN gateway is working fine.

Copy files from one S3 bucket to another S3 bucket on same account

Raghavendra Seshumurthy
  1. Create a new S3 bucket testbucketbkp1.
  2. Create a new S3 bucket testbucketbkp2.
  3. Upload a test file to testbucketbkp1.
  4. Now install the AWS CLI on PC.
  5. Type aws configure

Enter the access key ID and secret access

6. Copy the objects between the source and target buckets using sync command

aws s3 sync s3://testbucketbkp1 s3://testbucketbkp2

8. The sync command uses the CopyObject APIs to copy objects between S3 buckets.

Public Cloud Vendor Service Icon Links

Raghavendra Seshumurthy

AWS Icons Link:

https://d1.awsstatic.com/webteam/architecture-icons/Q32020/AWS-Architecture-Icons-Deck_For-Dark-BG_20200911.pptx.d3ede776850ba23f4fdbf63270c3a0be9e801d25.zip

https://d1.awsstatic.com/webteam/architecture-icons/Q32020/AWS-Architecture-Icons-Deck_For-Light-BG_20200911.pptx.b238f9167071d2e7dccf32957782161dd1fe7a56.zip

GCP Icons Link:

https://docs.google.com/presentation/d/1aGOTpNdCoO4GXZ2es38ZFO5qPGEAjTtDSVeHaDpwsas/edit#slide=id.g5e923c6224_190_56

Azure Icons Link:

https://arch-center.azureedge.net/icons/Azure_Public_Service_Icons_V3.zip

Difference Between AWS Classic and Application Load Balancer:

Raghavendra Seshumurthy
FeatureClassic Load BalancerApplication Load Balancer
ProtocolsHTTP, HTTPS, TCP, SSLHTTP, HTTPS
PlatformsEC2-Classic, EC2-VPCEC2-VPC
Sticky sessions (cookies)YES (you can provide your own application cookie)Load balancer generated
Back-end server authenticationYESNO
Back-end server encryptionYESYES
Idle connection timeoutYESYES
Connection drainingYESYES
Cross-zone load balancingYESAlways enabled
Health checksYESYES
CloudWatch metricsYESYES
Access logsYESYES
Path-based routingNOYES
Route to multiple ports on a single instanceNOYES
HTTP/2 supportNOYES
Websockets supportNOYES
Load balancer deletion protectionNOYES

Cloud Storage Cost Details

Raghavendra Seshumurthy
PricingAWSAzureGoogle
StorageAmazon S3Azure blob storageGoogle Cloud storage
Pricing Details First 50TB/month –> $0.023 per GB
Next 450TB/month –> $0.022 per GB
Next 500TB/month –>$0.021 per GB
GRS (Global redundant system)
First 50TB/month –> $0.0368 per GB
Next 450TB/month –> $0.0354 per GB
Over 500TB/month  –> $0.0339 per GB
LRS (Local redundant system)
First 50TB/month –> $0.0184 per GB
Next 450TB/month à $0.0177 per GB
Over 500TB/month  à $0.0170 per GB		Cloud Storage:
Multi regional à $0.026 to 0.036 per GB/month
Regional à $0.02 to $0.035 per GB/month
Cold line (Archive) à $0.004 to $0..014 per month
Archive
Details		S3 Glacier (Archive) –> $0.004 per GBArchive –> 0.01 GB per monthCold line (Archive) –> $0.004 to $0..014 per month