CGNAT for ISP — Manage Carrier Grade NAT Without Compliance Headaches
Manage CGNAT deployments with IPv4 pool tracking, port block allocation, subscriber-to-IP mapping, NAT logging for TRAI compliance, and integration with ISP billing.
Quick answer
IPv4 addresses are exhausted, but your subscribers need internet access. CGNAT (Carrier Grade NAT) lets you share public IPv4 addresses across multiple subscribers — but it introduces complexity in logging, compliance, and troubleshooting. NowaCRM helps you manage CGNAT deployments with proper subscriber-to-IP mapping, NAT logging, and compliance reporting.
IPv4 Pool Management
Track your public IPv4 address pools and their allocation. See which addresses are in use, available, or reserved. Monitor utilization rates to plan capacity. NowaCRM integrates pool data with subscriber assignments for complete visibility — you always know which subscriber is behind which public IP at any given time.
Port Block Allocation Tracking
CGNAT assigns port blocks to subscribers for address sharing. NowaCRM tracks these allocations — subscriber, private IP, public IP, port range, and timestamps. When law enforcement or TRAI requests subscriber identification from a public IP + port + timestamp, you can resolve it instantly from the logs.
NAT Logging for Compliance
Indian ISPs must maintain NAT logs as per TRAI and DOT requirements. NowaCRM captures and stores NAT translation logs with subscriber mapping. Logs are indexed by public IP, timestamp, and subscriber for fast retrieval. Retention periods are configurable to meet regulatory requirements (typically 1-2 years).
Integration with Billing
CGNAT management is integrated with subscriber billing. IP assignments are linked to subscriber profiles. When a subscriber is suspended or terminated, their CGNAT allocation is released automatically. Billing reports can show subscriber count per public IP for capacity analysis.
IPv6 Transition Planning
CGNAT is a bridge technology while you transition to IPv6. NowaCRM supports dual-stack (IPv4 + IPv6) subscriber management. Track your IPv6 rollout progress alongside CGNAT utilization. As IPv6 adoption increases, CGNAT load decreases — and you have the data to plan the transition timeline.
Frequently Asked Questions
What is CGNAT and why do ISPs need it?
CGNAT (Carrier Grade NAT) allows ISPs to share limited public IPv4 addresses among multiple subscribers using port-based multiplexing. It's essential due to IPv4 address exhaustion.
Does NowaCRM help with TRAI compliance for CGNAT?
Yes. NAT translation logs with subscriber mapping are captured and stored for regulatory compliance. Logs are indexed for fast retrieval during law enforcement queries.
Can I track which subscriber used which public IP?
Yes. NowaCRM tracks subscriber-to-public-IP-to-port-block mappings with timestamps. Any public IP + port + time query can be resolved to a specific subscriber.
Does it support IPv6?
Yes. NowaCRM supports dual-stack (IPv4 + IPv6) subscriber management, helping you plan and execute the transition from CGNAT to native IPv6.
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