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jglynn
asked 3 years ago
EC2 in IPv6 VPC unreachable from outside - why?
Hi all,
I have an IPv6 capable (t2.small) test server running Ubuntu 16.04.1 set up in the eu-west-1 area. The VPC has an IPv6 allocation, and subnets have IPv6 /64s, too. The NAT Internet Gateway is set up as well an an IPv6 Egress Internet Gateway, both set up in the main route table for the 0.0.0.0/0 and ::/0 prefixes, respectively.
The network ACLs associated with the subnets allow for both incoming and outgoing traffic from and to ::/0.
Similarly, the Security Group associated with the instance permits incoming traffic from ::/0 to tcp:80, tcp:443 and any incoming IPv6 ICMP traffic from ::/0.
The network interface attached to the VM has an permanently assigned IPv6 (2a05:d018:n:n::23) address.
From the running instance, I can see via tcpdump that IPv6 traffic is flowing neatly, e.g.
```
10:56:42.285595 IP6 2a05:d018:n:n::23.123 > 2001:67c:1560:8003::c7.123: NTPv4, Client, length 48
10:56:42.296728 IP6 2001:67c:1560:8003::c7.123 > 2a05:d018:n:n::23.123: NTPv4, Server, length 48
```
However, trying to access the server by its IPv6 address from the Internet - either by means of pinging through a looking glass such as <https://www.sprint.net/lg/lg_start.php> or by trying to access the website from home (with long-time working, afaik filterless IPv6 connectivity) fails.
A tracepath6 breaks off some perceived hops before the machine:
```
9: 2600:9000:eee::1c7 40.986ms asymm 18
10: 2a01:578:0:10::c 40.118ms asymm 17
11: no reply
12: 2a01:578::1 40.245ms asymm 14
13: no reply
14: 2a01:578::13 41.313ms
15: 2a01:578:0:10::8 41.910ms asymm 12
```
and both ping and http requests do not even show up in the VM's tcpdump.
I'm currently stuck in seeing which option I may have missed, or what causes the connectivity to fail. Any eye-opening assistance would be appreciated.
Best regards
Dominik
Accepted AnswerSecurity Group
9
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DominikN
asked 5 years ago