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Thread: ipv6 module not showing up, but ipv6 enabled in ifconfig

  1. #1
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    Question ipv6 module not showing up, but ipv6 enabled in ifconfig

    I can't cut and paste because my network is broken. However:

    lsmod | grep ipv6 shows no results, yet there is an ipv6 address when I type ifconfig.

    How is this possible? Why is ifconfig trying to use ipv6 if my kernel doesn't support it? I am fairly certain this is the cause of my current networking issue.

    Thanks a ton!!
    “Freedom without socialism is privilege and injustice, and socialism without freedom is slavery and brutality.” -Mikhail Bakunin
    Open source is anarchism in action.

  2. #2
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    Re: ipv6 module not showing up, but ipv6 enabled in ifconfig

    Tried deleting ipv6 address with:
    http://tldp.org/HOWTO/Linux+IPv6-HOWTO/x1050.html

    But I get:
    SIOCDIFADDR: Cannot assign requested address

    lol I can't even delete the ipv6 address from my machine
    “Freedom without socialism is privilege and injustice, and socialism without freedom is slavery and brutality.” -Mikhail Bakunin
    Open source is anarchism in action.

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    Re: ipv6 module not showing up, but ipv6 enabled in ifconfig

    Quote Originally Posted by kerryhall View Post
    I can't cut and paste because my network is broken. However:

    lsmod | grep ipv6 shows no results, yet there is an ipv6 address when I type ifconfig.

    How is this possible? Why is ifconfig trying to use ipv6 if my kernel doesn't support it? I am fairly certain this is the cause of my current networking issue.

    Thanks a ton!!
    I checked, and there is no module "ipv4" either!

    Apparently IPv6 is built into the kernel just like IPv4.

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    Re: ipv6 module not showing up, but ipv6 enabled in ifconfig

    Quote Originally Posted by kerryhall View Post
    lol I can't even delete the ipv6 address from my machine
    Yes, you can, but why?

  5. #5
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    Re: ipv6 module not showing up, but ipv6 enabled in ifconfig

    Alright, someone told me that the way to check for ipv6 support is to do an lsmod | grep ipv6 but I guess that's wrong.

    When I use an access point that doesn't have ipv6 enabled, I can connect fine, but I have problems connecting to this ipv6 access point. I can connect to it fine via ipv6 on a macbook, so my guess is the issue is probably ipv6 in Ubuntu.

    What debugging info should I provide here?
    “Freedom without socialism is privilege and injustice, and socialism without freedom is slavery and brutality.” -Mikhail Bakunin
    Open source is anarchism in action.

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    Re: ipv6 module not showing up, but ipv6 enabled in ifconfig

    Yes, in the old days there was an ipv6 module. But apparently not anymore.

    To see if the AP provides IPv6, type this:

    Code:
    ifconfig
    time wget www.google.com
    time wget -6 www.google.com
    time wget -4 www.google.com
    and post the output here.

  7. #7
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    Re: ipv6 module not showing up, but ipv6 enabled in ifconfig

    The first two commands time out, the third one manages to get an IP out of google.com, I get an http 200, then things time out.


    Do you have a one liner to disable ipv6 for debugging? All my google results for that have been incorrect so far.
    “Freedom without socialism is privilege and injustice, and socialism without freedom is slavery and brutality.” -Mikhail Bakunin
    Open source is anarchism in action.

  8. #8
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    Re: ipv6 module not showing up, but ipv6 enabled in ifconfig

    Tried this as well to disable ipv6:

    http://www.noobslab.com/2012/05/disa...ternet-is.html

    Still apparently get an ipv6 address in ifconfig. Tried rebooting after those instructions as well.
    “Freedom without socialism is privilege and injustice, and socialism without freedom is slavery and brutality.” -Mikhail Bakunin
    Open source is anarchism in action.

  9. #9
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    Re: ipv6 module not showing up, but ipv6 enabled in ifconfig

    Commented out ipv6 lines in /etc/hosts, ifconfig still reports an ipv6 address. (after rebooting)
    “Freedom without socialism is privilege and injustice, and socialism without freedom is slavery and brutality.” -Mikhail Bakunin
    Open source is anarchism in action.

  10. #10
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    Re: ipv6 module not showing up, but ipv6 enabled in ifconfig

    I realized I should be looking at the network manager lol. I changed ipv6 settings there to "ignore" and ifconfig reports no ipv6 address now.

    It seems at least part of the problem is ipv6. Indeed, I can now ping google and at least get at response. However, ping times are quite slow (300 ms or so) compared with 2 ms on a MacBook Pro on the same AP. Sites load, but they take a bit of time (5 seconds for google) or sometimes longer.

    Any ideas? I have noticed this issue as well

    service networking restart
    stop: Unknown instance:
    networking stop/waiting

    /etc/init.d/networking restart
    (message about being deprecated)
    * Reconfiguring.... [ OK ]

    (messages are not exact as I do not have cut and paste but you get the idea)
    “Freedom without socialism is privilege and injustice, and socialism without freedom is slavery and brutality.” -Mikhail Bakunin
    Open source is anarchism in action.

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