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RFC: NAT Firewall Component

firewallIssues relating to the Firewall exampleIssues relating to the Firewall example

Status: Open.

#275 In au-ts/lionsos;

· cazb2 opened on Feb 17, 2026

Firewall: Create an optimised (possibly) reusable solution to multiple writers to shared memory state

enhancementNew feature or requestNew feature or request

firewallIssues relating to the Firewall exampleIssues relating to the Firewall example

Status: Open.

#272 In au-ts/lionsos;

· Courtney3141 opened on Feb 14, 2026

Additional small NAT fixes

firewallIssues relating to the Firewall exampleIssues relating to the Firewall example

good first issueGood for newcomersGood for newcomers

Status: Open.

#268 In au-ts/lionsos;

· Courtney3141 opened on Feb 10, 2026

Add ICMP redirect support

firewallIssues relating to the Firewall exampleIssues relating to the Firewall example

Status: Open.

#267 In au-ts/lionsos;

· DaiDaiDai123 opened on Feb 2, 2026

Add IGMP and multicast traffic forwarding support

firewallIssues relating to the Firewall exampleIssues relating to the Firewall example

Status: Open.

#266 In au-ts/lionsos;

· Courtney3141 opened on Feb 2, 2026

Support port forwarding in NAT

firewallIssues relating to the Firewall exampleIssues relating to the Firewall example

Status: Open.

#265 In au-ts/lionsos;

· debater-coder opened on Jan 30, 2026

Incremental checksum recalculation in NAT (RFC 1624)

firewallIssues relating to the Firewall exampleIssues relating to the Firewall example

Status: Open.

#264 In au-ts/lionsos;

· debater-coder opened on Jan 30, 2026

Optimise searching for existing NAT port-mappings

firewallIssues relating to the Firewall exampleIssues relating to the Firewall example

Status: Open.

#263 In au-ts/lionsos;

· debater-coder opened on Jan 30, 2026

Update NAT entry timestamp for returning traffic

firewallIssues relating to the Firewall exampleIssues relating to the Firewall example

Status: Open.

#262 In au-ts/lionsos;

· debater-coder opened on Jan 28, 2026

Support NAT on ICMP packets

firewallIssues relating to the Firewall exampleIssues relating to the Firewall example

Status: Open.

#261 In au-ts/lionsos;

· debater-coder opened on Jan 28, 2026

Review lwipopts.h

minor improvementImplementation could be improved with minor changesImplementation could be improved with minor changes

Status: Open.

#246 In au-ts/lionsos;

· dumsum opened on Nov 11, 2025

Graceful network error handling for KITTY

enhancementNew feature or requestNew feature or request

kitty

minor improvementImplementation could be improved with minor changesImplementation could be improved with minor changes

Status: Open.

#240 In au-ts/lionsos;

· omeh-a opened on Oct 29, 2025