IPv6 doesn't work in AWS Lambda in Native mode #49688
Description
Describe the bug
Hello,
In AmazonLambdaCommonProcessor (quarkus-amazon-lambda extension), "java.net.preferIPv4Stack" is fixed to true, and while in JVM mode it can be set back to "false" later, in native mode, it removes IPv6 support from native executable completely:
/**
* Lambda custom runtime does not like ipv6.
*/
@BuildStep(onlyIf = NativeBuild.class)
void ipv4Only(BuildProducer<SystemPropertyBuildItem> systemProperty) {
// lambda custom runtime does not like IPv6
systemProperty.produce(new SystemPropertyBuildItem("java.net.preferIPv4Stack", "true"));
}AWS Lambda didn't support IPv6 in the past, probably that's why this configuration was added, but now IPv6 is supported (you need to enable it for a function and for VPC, if a function is within a VPC). And there are use cases when you'd like to use it (e. g. if your lambda is linked to VPC and you need to access the internet, you may want to use IPv6 "Egress-only Internet Gateway" instead of NAT Gateway to save costs).
I tried to override the value of this property by adding my own extension that would set this property to "false", and the resultant native executable was able to use IPv6 networking correctly.
Would it be possible to make this assignment optional? Maybe introduce some configuration property that will allow to override it? I can prepare a pull request for that
Expected behavior
No response
Actual behavior
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How to Reproduce?
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Output of uname -a or ver
Linux DESKTOP-6O5TNI8 6.6.84.1-microsoft-standard-WSL2 #1 SMP PREEMPT_DYNAMIC Tue Apr 1 19:37:06 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
Output of java -version
OpenJDK 64-Bit Server VM GraalVM CE 24.0.1+9.1 (build 24.0.1+9-jvmci-b01, mixed mode, sharing
Mandrel or GraalVM version (if different from Java)
No response
Quarkus version or git rev
Build tool (ie. output of mvnw --version or gradlew --version)
No response
Additional information
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