JOSM does not use IPV6

[stoecker]

While Java should support IPV6 and JOSM server uses IPV6, when calling JOSM, only IPV4 requests are sent.

Either a Java issue (I have OpenJSK on openSUSE) or a JOSM issue.

[Don-vip]

Cannot help on this one, my Internet connection being IPv4 only.

[stoecker]

See ​http://www.sixxs.net/ :-)

[Don-vip]

Nice. I'll give it a try :)

[Don-vip]

​Related stuff

[stoecker]

Java still requires an explicit "-Djava.net.preferIPv6Addresses=true" even on an OS with native IPV6. Rather outdated behaviour.

[stoecker]

In 5892/josm:

fix #8562 - use IPv6 when existing

[stoecker]

Again a fix probably not working with webstart...

[stoecker]

Could someone with IPV4 only test if it works as expected?

[stoecker]

In 5893/josm:

see #8562 - remote control using dual stack

[Firefishy]

I have a machine with a non-working IPv6 stack. I explicitly run JOSM with -Djava.net.preferIPv6Addresses=false

The change in r5893/josm breaks my machine all ALL downloads fail.

[anonymous]

Java 1.7.0_17 with JOSM 5899. Broken IPv6 teredo tunneling.

Java Djava.net.preferIPv6Stack=true + JOSM prefer.ipv6=true = Timeout
Java Djava.net.preferIPv4Stack=true + JOSM prefer.ipv6=true = Works
Java Djava.net.preferIPv6Stack=true + JOSM prefer.ipv6=false = Works
Java Djava.net.preferIPv4Stack=true + JOSM prefer.ipv6=false = Works

In summary: JOSM since r5893/josm in default config now fails on a machine with a broken IPv6 stack.

[iandees]

On my MacOS X 10.8.2 box running Java(TM) SE Runtime Environment (build 1.6.0_43-b01-447-11M4203) r5899/josm fails. I have an ipv6 address but it's probably just from my wireless router and isn't routable.

[stoecker]

In 5900/josm:

Java IPv6 is so broken, it can't be enabled by default (fix #8627, see #8562)

[stoecker]

Also wanted to do a stackoverflow question once :-)

​http://stackoverflow.com/questions/16164175

Maybe others know more about Java and IPv6.

[Don-vip]

upvoted as well :)

[Don-vip]

So we can reopen a ticket :)
I think this is something we should only care about after Java 7 transition.
Loking at ​IPV6-related JDK bugs, I see plenty of ones fixed between 7 and 7u1. There's no hope to have a valid implementation with Java 6.

[saerdnaer]

Any updates on this issue?

[stoecker]

No. Java still does their own stuff instead of using the local solver. You can set "prefer.ipv6=true" if you have a working IPv6 connection and it should have no negative effects. But we can't make it default.

Maybe we can test it? Try connecting to "josm.openstreetmap.de" with IPv6 and when it works set prefer IPv6 when "prefer.ipv6=auto" is auto (and make "auto" default)?

[saerdnaer]

I have an IPv6-only OSM API endpoint at ​http://maps.testi.ber.c3voc.de:3000/api which I can't reach, even when I set "prefer.ipv6=true" and restarted JOSM on Mac OS X 10.10.

[stoecker]

Did you have a look wireshark to see what JOSM actually tries to do? What error messages do you get (or what console outputs). For a working IPV6 setup "prefer.ipv6=true" should not be necessary at all to reach an IPv6 only target.

I get this (without special ipv6 setting):

INFO: GET http://maps.testi.ber.c3voc.de:3000/api/0.6/user/details (Anzahl der ungelesenen Nachrichten abrufen)
WARNUNG: org.openstreetmap.josm.io.OsmApiException: ResponseCode=401
org.openstreetmap.josm.io.OsmApiException: ResponseCode=401

called josm with

java -jar josm-latest.jar --set=osm-server.url=http://maps.testi.ber.c3voc.de:3000/api

[stoecker]

Nice, Actually "prefer.ipv6" is totally useless, because changing it during runtime has no effect. Only works as a java commandline option. Java IPv6 support is still completely broken.

[stoecker]

Ah no, it's even more complex. It works as is set before first network access, but an autodetect does not work, as this causes first network access and afterwards changing this is useless. Bloody hell!

[stoecker]

In 8295/josm:

fix #8562 - autodetect working IPv6 - hopefully solve bad Java IPv6 support

[stoecker]

In 8296/josm:

see #8562 - move IPv6 detection to main class instead of preferences

[stoecker]

In 8299/josm:

see #8562 - text correction

[stoecker]

In 8298/josm:

see #8562 - text improvement

[simon04]

For reference: there's an ongoing discussion on JOSM's IPv6 support on the mailinglist: ​https://lists.openstreetmap.org/pipermail/josm-dev/2015-December/007590.html

[stoecker]

In 9238/josm:

see #8562 - restart JOSM in case we switched from IPv6 to IPv4 only, so we have no broken connection