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centos7.4 ipv6 automatically disabled after a while.
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centos7.4 ipv6 automatically disabled after a while.

Hi , this is most troubling

I have plesk installed on centos 7.4 , I configured ipv6 before plesk , and tested by
ping6 google.com confirm it's working

and then I set my site to run on ipv6 , initially it works , but after a while , like an hour or so , ipv6 is not longer working , ping6 google.com failed
reboot will fix the issue , but I can't just reboot it every now and then.

I have 2 VPS with same installation , this one lost its ipv6 every once a while , but other VPS seems keep it working all the time.

anyone has ever experienced such issue ?

a help is appreciated .

Comments

  • Try adding

    net.ipv6.conf.default.accept_ra=0 net.ipv6.conf.default.autoconf=0 net.ipv6.conf.all.accept_ra=0 net.ipv6.conf.all.autoconf=0 net.ipv6.conf.eth0.accept_ra=0 net.ipv6.conf.eth0.autoconf=0

    to /etc/sysctl.d/50-IPv6.conf, reboot and see if it helps

  • @qtwrk said:
    Hi , this is most troubling

    I have plesk installed on centos 7.4 , I configured ipv6 before plesk , and tested by
    ping6 google.com confirm it's working

    and then I set my site to run on ipv6 , initially it works , but after a while , like an hour or so , ipv6 is not longer working , ping6 google.com failed
    reboot will fix the issue , but I can't just reboot it every now and then.

    I have 2 VPS with same installation , this one lost its ipv6 every once a while , but other VPS seems keep it working all the time.

    anyone has ever experienced such issue ?

    a help is appreciated .

    How is your system set up to get its ipv6 address ... ?

    Sounds like your system autoconfigures an ipv6 on start up by sending a router solicitation
    and getting a reply - however if the router is not sending out periodic router advertisements
    or they are blocked/lost your machine will loose its address ... until next reboot.

    You could configure the address you get as well as gateway and default route manually.

  • its hacked! start over.

  • when it's working, run 'ip -6 route' and paste the results here.

  • @WSS said:
    when it's working, run 'ip -6 route' and paste the results here.

    unreachable ::/96 dev lo metric 1024 error -113
    unreachable ::ffff:0.0.0.0/96 dev lo metric 1024 error -113
    unreachable 2002:a00::/24 dev lo metric 1024 error -113
    unreachable 2002:7f00::/24 dev lo metric 1024 error -113
    unreachable 2002:a9fe::/32 dev lo metric 1024 error -113
    unreachable 2002:ac10::/28 dev lo metric 1024 error -113
    unreachable 2002:c0a8::/32 dev lo metric 1024 error -113
    unreachable 2002:e000::/19 dev lo metric 1024 error -113
    2a03:4000:21:4::/64 dev eth0 proto kernel metric 256
    unreachable 3ffe:ffff::/32 dev lo metric 1024 error -113
    fe80::1 dev eth0 proto static metric 100
    fe80::/64 dev eth0 proto kernel metric 256
    default via fe80::1 dev eth0 proto static metric 100
    

    I have compared when it's not working , output the same.

    @svmo said:

    How is your system set up to get its ipv6 address ... ?

    I got it followed this guide here https://unix.stackexchange.com/questions/316730/how-to-setup-ipv6-on-centos

    @sirpumpkin said:
    Try adding
    to /etc/sysctl.d/50-IPv6.conf, reboot and see if it helps

    thanks , will see how it goes.

  • @qtwrk said:
    I have compared when it's not working , output the same.

    Yeah. It's not dropping your route because it's out of band, which @sirpumpkin was providing a workaround for.

  • @WSS said:

    @qtwrk said:
    I have compared when it's not working , output the same.

    Yeah. It's not dropping your route because it's out of band, which @sirpumpkin was providing a workaround for.

    thanks , I will see how it goes

  • @sirpumpkin said:
    Try adding
    to /etc/sysctl.d/50-IPv6.conf, reboot and see if it helps

    @WSS said:
    Yeah. It's not dropping your route because it's out of band, which @sirpumpkin was providing a workaround for.

    thanks , but unfortunately ipv6 still went off after a while...

  • It's strange, I have a VPS with Centos-7 Minimal, working with IPV6, and it works very well without any additional configuration except to place it in the adapter, you should consider opening a ticket to your provider.

  • @vanhels said:
    It's strange, I have a VPS with Centos-7 Minimal, working with IPV6, and it works very well without any additional configuration except to place it in the adapter, you should consider opening a ticket to your provider.

    indeed it is strange , I have 2 VPS from same provider , with exact same conf and setting , one works all the time , another one lost ipv6 few minutes after reboot

  • For the above, open a ticket with your provider and tell him that his 2 VPS are configured in the same way, and that one works in IPV6 and in another not, sure that it helps.

  • @vanhels said:
    For the above, open a ticket with your provider and tell him that his 2 VPS are configured in the same way, and that one works in IPV6 and in another not, sure that it helps.

    arrrgggg , this problem is killing me here.

    ticket sent , let's see how it goes ...

    thanks for advice :)

  • I worked out , but still didnt get it why and how.

    The provider is Netcup , if i set ipv6 during ISO installation , ipv6 works fine all the way .

    But if i install system first and then add ipv6 sftwards , ipv6 will become unusable after a while.

    I write it here in case someone who got same problme and luckily google'd this thread , hope this could be a help.

  • For NetCup, @sirpumpkin's suggestion generally works.

  • @WSS said:
    For NetCup, @sirpumpkin's suggestion generally works.

    well , I think I am the "de-generally" case ...
    but any way , it works now ...

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