Imvedansh opened a new pull request, #10617:
URL: https://github.com/apache/cloudstack/pull/10617
### Description
This PR fixes a UX gap in the VPC Network Tier (Add Network) form, where the
parent VPC CIDR was not visible or accessible during subnet configuration.
Previously, users had to manually close the form, navigate back to the VPC
details, copy the CIDR, and then reopen the form to paste the correct subnet
range.
With this PR:
- The Add Network form now auto-fills:
- Gateway: Based on CIDR
- Netmask: Based on CIDR
- This eliminates context switching, reduces input errors, and improves
workflow efficiency.
Expected behavior (after fix):
When creating a new network tier inside a VPC, the form automatically
suggests a valid (CIDR) gateway, and netmask within the VPC's CIDR block.
This Fixes : #10615
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### Types of changes
- [ ] Breaking change (fix or feature that would cause existing
functionality to change)
- [X] New feature (non-breaking change which adds functionality)
- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] Enhancement (improves an existing feature and functionality)
- [ ] Cleanup (Code refactoring and cleanup, that may add test cases)
- [ ] build/CI
- [ ] test (unit or integration test code)
### Feature/Enhancement Scale or Bug Severity
#### Feature/Enhancement Scale
- [ ] Major
- [ ] Minor
#### Bug Severity
- [ ] BLOCKER
- [ ] Critical
- [ ] Major
- [ ] Minor
- [ ] Trivial
### Screenshots (if appropriate):


### How Has This Been Tested?
- Verified by creating a new VPC with a /16 CIDR block.
- Used the Add Network form under the created VPC.
- Confirmed that the form auto-fills a /24 subnet, valid gateway, and
netmask.
- Ensured the inputs reflect valid and usable values within the VPC CIDR.
- Checked that manual override is still possible.
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#### How did you try to break this feature and the system with this change?
-Tried editing the auto-filled values to invalid CIDRs → proper validation
triggers.
-Created multiple network tiers to ensure no collisions and clean
suggestions.
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