On 28-8-2014 09:54, hugo.larson@... [Firebird-Java] wrote:

> I have a problemen since the early days of firebird and Jaybird.
> I'm now using firebird 2.5, Jaybird 2.2.3 and JRE 1.7.0_55.
>
> When TCP/IP6 is installed (windows) the communications with the database
> engine becomes very slow. It works but is 10 fold slower.
> It does not matter if it's local or remote host.
> We have our system running on independent database engines on over 200
> computers, mostly on local host.
>
> When we remove completly TCP/IP 6 the problem is fixed.
>
> I have tried -Djava.net.preferIPv4Stack=true on the jvm but it does not
> help.

Which version of Windows do you use? I use Windows 7 and 8.1 with IP v6
installed for testing and - as far as I am aware - I don't experience
these problems. Could you quantify the times with and without IP v6?

What happens if you specify the IP address instead of the hostname?

Also what exactly becomes slower? Connect time, or does the entire
connection itself become slow? I changed the hostname resolution between
Jaybird 2.2.1 and 2.2.2, did this problem also occur before this change?

Instead of looking at prefIPv4Stack, you might want to check the value
of java.net.preferIPv6Addresses (default should be false, but this can
be overridden on a system level).

Mark
--
Mark Rotteveel