Correct way of using gen_tcp:connect with IPv6 Address

Question

Does anyone know how to connect to ipv6 tcp server address. Following tried but does not work.

{ok, Socket} = gen_tcp:connect("2a01:488:67:1000:253d:cd31:0:1", 5000, [{active, false},inet6]).
{error,enetunreach}

And this

{ok, Socket} = gen_tcp:connect("[2a01:488:67:1000:253d:cd31:0:1]", 5000, [{active, false},inet6]).
{error,nxdomain}

The server is reachable over IPv4 though.

Thanks.

Is the server reachable over IPv6 outside Erlang? When you say "reachable over IPv4", do you mean in Erlang? Do you mean by using (e.g.) "192.168.1.1" in the `gen_tcp:connect` call, or something else? — Roger Lipscombe, Jun 20 '17 at 16:05
Fixed. Please ignore this it was port blocking for ipv6 addresses. thanks — user3404572, Jun 20 '17 at 17:26

score 1 · Answer 1 · edited Jun 28 '20 at 11:48

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On shell A:

$erl

{ok, LSocket} = gen_tcp:listen(12345, [binary, {packet, line}, {active, true}, {reuseaddr, true}, inet6, {ip, {0,0,0,0,0,0,0,1}}]).

to test, on shell B:

$telnet ::1 12345

edited Jun 28 '20 at 11:48

David Buck

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answered Jun 28 '20 at 10:36

Kushal Kothari

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Pouriya · Answer 2 · 2017-06-21T22:19:19.040

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According to the manual page of gen_tcp module, First argument of connect/3-4 should be type of inet:socket_address() or inet:hostname().
Try using This form of type.

edited Jun 21 '17 at 22:19

answered Jun 21 '17 at 18:31

Pouriya

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score 0 · Answer 3 · answered Jun 28 '20 at 17:53

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Instead of (0,0,0,0,0,0,0,1}.We can also use your own IPv6 address. Use inet:parse_address("your IP address").

answered Jun 28 '20 at 17:53

Kushal Kothari

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Correct way of using gen_tcp:connect with IPv6 Address

3 Answers3