Yes, this is definitely not something specific to ansible. I would aim to have both instances being properly dualstack, but I'm an IPv6 evangelist :p Apart from what Antony said, it could also be that the instance has somehow gotten an IPv6 address assigned, which makes the OS think it's got dualstack connectivity, but then the required network configuration further up is not there/working. For example there might not be an IPv6 egress internet gateway, or a security group is missing some IPv6 prefix.
DIck On Thu, 12 Jan 2023 at 16:28, Antony Stone <[email protected]> wrote: > > On Thursday 12 January 2023 at 16:15:59, Eli Taft wrote: > > > I have two Debian servers on EC2 instances in AWS. > > > One server is attempting to connect using IPv6 first, and only when all of > > those time out does it try and succeed to download using an IPv4 address. > > > The other server doesn't do this... it just using IPv4 and downloads > > instantaneously. > > > Both of these servers are using the same network / vpc settings too. > > The first thing I would test is whether both servers can resolve a hostname > which has both IPv4 and IPv6 addresses, and whether they can both connect to > each address. > > My suspicion is that one is (mis?)configured with an IPv6 address, and > therfore > tries to use IPv6, which then fails, and the other server doesn't even have an > IPv6 address (or route?) and therefore just goes for IPv4 immediately. > > For example, this is what I get on one of my (not AWS) machines: > > $ ping4 -n google.com > PING google.com (172.217.16.206) 56(84) bytes of data. > 64 bytes from 172.217.16.206: icmp_seq=1 ttl=57 time=10.2 ms > 64 bytes from 172.217.16.206: icmp_seq=2 ttl=57 time=10.3 ms > 64 bytes from 172.217.16.206: icmp_seq=3 ttl=57 time=10.2 ms > > $ ping6 -n google.com > PING google.com(2a00:1450:4001:806::200e) 56 data bytes > 64 bytes from 2a00:1450:4001:806::200e: icmp_seq=1 ttl=57 time=10.3 ms > 64 bytes from 2a00:1450:4001:806::200e: icmp_seq=2 ttl=57 time=10.3 ms > 64 bytes from 2a00:1450:4001:806::200e: icmp_seq=3 ttl=57 time=10.3 ms > > > Antony. > > -- > 3 logicians walk into a bar. The bartender asks "Do you all want a drink?" > The first logician says "I don't know." > The second logician says "I don't know." > The third logician says "Yes!" > > Please reply to the list; > please *don't* CC me. -- You received this message because you are subscribed to the Google Groups "Ansible Project" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/ansible-project/CAF8BbLasELpYth-rwQH-HCLFw2f_zvSYNZvH%3D1sb_YXJSLepuw%40mail.gmail.com.
