When connecting iOS devices to our Sonicwall VPN (L2TP) it takes about 30 seconds before any internal servers can be contacted. It appears to be purely a DNS problem because they can be contacted via IP address. This issue does not exist on Mac or PC desktops/laptops.
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I have observed the same behavior on iOS and OS X and we are tunneling all traffic. – sardean Oct 02 '14 at 18:53
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I have tried flipping the all traffic switch with no change in behavior. – Brian Oct 02 '14 at 18:54
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Yes, sorry for the lack of clarity but we experience the same behavior regardless of tunnel all or not. I have not been able to find a solution as of yet. – sardean Oct 02 '14 at 19:14
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My above post was in error, i missed the iOS part. This is for the os x client – Mar 03 '15 at 07:32
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It's an IPV6 issue, if you go to console and open your ppp log you will notice an IPv6 query every 3 seconds until it times out. You need to tell the ppp daemon to not try IPv6. To do this create a text file called options.txt with the following string: ipv6cp-max-configure 0 Save that file to the etc/ppp directory. You need to be root or sudo cp it via terminal. Reboot and your problem should go away.
