[SOLVED-ISH] ipv6 dropping intermittently, fixed with netcfg -r

So ipv6 connectivity drops randomly, without any interruption to ipv4.
I'm not really sure what logs to look into to check what the real error is.
However, a netcfg -r eth0 immediately after it drops out reconnects me to ipv6, and nobody else on the same network+host machine has the same issue. Therefore I'm assuming that this has something to do with my system. I'm running arch in a KVM.
Any ideas? Right now I just have a script running on cron that checks if ipv6 connectivity is broken and does netcfg -r, but obviously this isn't a valid solution.
This is what my profile looks like:
CONNECTION='ethernet'
DESCRIPTION='ipv6+ipv4 eth0'
INTERFACE='eth0'
IP=static
ADDR=69.85.88.224
NETMASK=24
ROUTES=
GATEWAY=69.85.88.1
IP6=static
ADDR6=(2606:df00:2::290c:6232/64 2606:df00:2::52c9:3080/64 2606:df00:2::a81:cb82/64 2606:df00:2::a1ac:9470/64 2606:df00:2::3ef6:a7e3/64)
(the gateway specified in ipv4 is the same router for ipv6)
Thanks.
[EDIT] I just checked my irc logs and it looks like it drops every 30 minutes on the hour and half hour, but there's nothing in crontab.
Last edited by kbar (2012-04-30 03:39:03)

found the issue.
https://bugs.archlinux.org/task/28887?s … &closedto=
should fix it. meanwhile i manually changed the default route to add the ipv6 gateway.

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    I've also looked at this:
    http://digital.ni.com/public.nsf/allkb/2B3FF46C8512C4F786256CF30071BE53?OpenDocument
    In one of my .vi's if I change 2 of the 3 input variables to the complex type, it works.  It seems to be insensitive to the data type of the first input variable.  In another .vi this trick doesn't work at all.  The fix given in the link is to update the .dll, but this seems to be old news as the .dll in my directory is newer than the one referenced in this link.
    The other funny thing is these scripts worked fine on Friday afternoon, but were throwing this error this morning.  I've closed and reloaded both Labview and Matlab, but that didn't fix the issue.
    Are there any new fixes for this issue that I haven't been able to find?
    Thanks,
    Doug

    Doug,
    If you have a service contract feel free to call in to the support line and you'll be able to work with someone on the phone. That'll be the quickest way to resolution.
    Feel free to send me a PM if you wish and I can take a look at the code and test it on our machine. 
    Notes for Branch AE:
    Please reply to This Post within 24 hours
    The US AE is expected to reply to all of your posts within 24 hours. Having this expectation will keep the escalation moving quickly and toward a fast resolution.
    You can also use other communication channels: Phone, Sametime, Lync,etc. to discuss the issue with the US AE. This can help with troubleshooting and quick diagnosis of the issue.
    Click here to provide kudos for a post on this page

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