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Re: [jetty-users] Client tries to connect to ipv6 host when bound to ipv4 interface
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Hi,
On Wed, Dec 21, 2022 at 8:33 AM Matthias Pfau via jetty-users
<jetty-users@xxxxxxxxxxx> wrote:
>
> Hi there,
> with jetty 11, we bind the http client to an ipv4 address as follows:
>
> httpClient.setBindAddress(new InetSocketAddress(serverConfig.getIpv4Address(), 0));
>
> We lately noticed, that this client can't connect to certain websites:
>
> java.util.concurrent.ExecutionException: java.net.SocketException: Could not connect to www.dan.me.uk/[2001:67c:26b4:2:21e:bff:fec7:87a]:443 <http://www.dan.me.uk/[2001:67c:26b4:2:21e:bff:fec7:87a]:443> at org.eclipse.jetty.client.util.FutureResponseListener.getResult(FutureResponseListener.java:113) at org.eclipse.jetty.client.util.FutureResponseListener.get(FutureResponseListener.java:96) at org.eclipse.jetty.client.HttpRequest.send(HttpRequest.java:771) at org.eclipse.jetty.client.HttpClient.GET(HttpClient.java:351) at org.eclipse.jetty.client.HttpClient.GET(HttpClient.java:336)
> It seems like the client that was bound to the ipv4 address tries to connect to the ipv6 address of www.dan.me.uk <http://www.dan.me.uk> which is impossible.
>
> Did we miss something or is this a bug?
>From https://docs.oracle.com/javase/8/docs/technotes/guides/net/ipv6_guide/:
"f a socket is bound to an IPv6 anylocal address on a dual-stack
machine, it can accept both IPv6 and IPv4 traffic; if it is bound to
an IPv4 (IPv4-mapped) anylocal address, it can only accept IPv4
traffic".
Seems that the scenario you have is not supported by the JDK.
--
Simone Bordet
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