ALB, adding IPv6 support - no traffic arrives at target instances

TLDR; do xLB support IPv6-to-IPv4 NAT ? Or only forward incoming IPvX traffic to matching IPvX target IPs ?

I have a standard working, IPv4 setup with a bunch of EC2 behind a ALB that also terminates our TLS.

I'd like to accept incoming IPv6 traffic. I've added IPv6 to the subnets, migrated the LB to duel stack and updated the DNS with AAAA records, then updated the various security groups.

But when I use https://ready.chair6.net/ to send IPv6 only traffic, nothing arrives at the target EC2s.

So I am wondering if the ALB doesn't to 6-to-4 translation, and so I would need to add IPv6 IPs to all the target EC2s and then route to our app from there ?

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亚马逊 EC2 弹性负载平衡应用程序负载均衡器 IPv6

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Tom

已提问 10 个月前302 查看次数

1 回答

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Hello.
EC2 should have no problem with IPv4.
You should be able to confirm that the ALB health check and other checks are successful.

专家

Riku_Kobayashi

已回答 10 个月前

专家

Gary Mclean

已审核 10 个月前

Riku_Kobayashi 专家

10 个月前

Access was confirmed on EC2 with IPv6 disabled and duel stack in ALB.

[root@ip-10-0-0-58 ~]# curl -v test-xxxxxxxx.ap-northeast-1.elb.amazonaws.com
*   Trying [2406:da14:77f:8a01:xxxx:xxxx:xxxx:xxxx]:80...
* Connected to test-xxxxxx.ap-northeast-1.elb.amazonaws.com (2406:da14:77f:8a01:xxxx:xxxx:xxxx:xxxx) port 80 (#0)
> GET / HTTP/1.1
> Host: test-xxxxxx.ap-northeast-1.elb.amazonaws.com
> User-Agent: curl/8.0.1
> Accept: */*
>
< HTTP/1.1 200 OK
< Date: Tue, 08 Aug 2023 08:44:45 GMT
< Content-Type: text/html; charset=UTF-8
< Content-Length: 5
< Connection: keep-alive
< Server: Apache/2.4.56 (Amazon Linux)
< Last-Modified: Tue, 08 Aug 2023 08:33:09 GMT
< ETag: "5-60265367eb799"
< Accept-Ranges: bytes
<
test
* Connection #0 to host test-xxxxxx.ap-northeast-1.elb.amazonaws.com left intact

The access log confirms that communication between ALB and EC2 is over IPv4.

[root@ip-10-0-0-239 ~]# tail -f /var/log/httpd/access_log
10.0.0.75 - - [08/Aug/2023:08:44:45 +0000] "GET / HTTP/1.1" 200 5 "-" "curl/8.0.1"
10.0.0.166 - - [08/Aug/2023:08:45:07 +0000] "GET / HTTP/1.1" 200 5 "-" "ELB-HealthChecker/2.0"
10.0.0.75 - - [08/Aug/2023:08:45:13 +0000] "GET / HTTP/1.1" 200 5 "-" "ELB-HealthChecker/2.0"
10.0.0.166 - - [08/Aug/2023:08:45:37 +0000] "GET / HTTP/1.1" 200 5 "-" "ELB-HealthChecker/2.0"
10.0.0.75 - - [08/Aug/2023:08:45:43 +0000] "GET / HTTP/1.1" 200 5 "-" "ELB-HealthChecker/2.0"

ALB, adding IPv6 support - no traffic arrives at target instances

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