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https://issues.apache.org/jira/browse/CASSANDRA-628?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12923741#action_12923741
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Benjamin Black commented on CASSANDRA-628:
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Given the decreasing average skill level of users and the defaults on common
distributions, this issue is becoming both more common and confusing more
people. Distributions are not going to be changing their defaults. We should
reconsider added the preferIPv4 setting to the default config, perhaps based on
inspecting the setting of IPV6_V6ONLY.
> java.net.SocketException: Invalid argument / java.net.NoRouteToHostException:
> Network is unreachable
> ----------------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-628
> URL: https://issues.apache.org/jira/browse/CASSANDRA-628
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Environment: Linux, FreeBSD, (possibly others)
> Reporter: Eric Evans
>
> This manifests as either a SocketException that occurs when starting a
> cassandra node, or a NoRouteToHostException which occurs when connecting with
> a client.
> On Linux systems this is caused by IPV6_V6ONLY being set true. The docs
> (ipv6(7)) say that when set this causes sockets to be created IPv6 only,
> while the previous behavior also allowed sending and receiving packets using
> an IPv4-mapped IPv6 address.
> The quick fix is to either launch applications using the
> -Djava.net.preferIPv4Stack=true property, or on Linux systems set
> net.ipv6.bindv6only=0 (see sysctl(8)).
> My limited understanding is that the previous behavior (IPV6_V6ONLY=0) was
> always considered a hack to be used until IPv6 was more mature/had gained
> traction and that a change in defaults was always inevitable, so in the
> long-term a Real Fix will be needed.
> http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6342561
> http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=560056
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