Unity VPN client - DNS Troubles continue

Discussion in 'Cisco' started by Eric Sorenson, Jan 6, 2005.

  1. Anyone else seeing really slow DNS lookups through split-tunnel
    VPN3k connections on recent linux kernels (i.e. 2.6.9 from
    fedora core 3)..? CSCee27420 has the tantalizing message

    Conditions: The linux 2.6.5 kernel made some changes that caused DNS
    resolution to fail."
    Workarounds: Upgrade to Linux VPN Client version or higher.

    But although does work, DNS is very, very slow for both
    through-tunnel and external lookups, like >5 sec per query/response.
    Eric Sorenson, Jan 6, 2005
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  2. To answer my own question, this is caused by a problem with ipv6
    being enabled by default. To fix, unless you really need ipv6 support,

    echo "NETWORKING_IPV6=no" >> /etc/sysconfig/network
    echo "alias ipv6 off" >> /etc/modprobe.conf
    echo "alias net-pf-10 off" >> /etc/modprobe.conf

    and reboot...
    Eric Sorenson, Jan 24, 2005
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