Hi,

   Just to let everyone know:
After a couple of weeks, Rogers has fixed the problem and now openvpn is working on both 3G and LTE.  I did not have to do anything except for a bit of troubleshooting
with Rogers. I have no idea what they did to get it working.

On 10/17/18 06:25, Jan Just Keijser wrote:
On 15/10/18 16:53, Kristian McColm wrote:
Re: [Openvpn-users] iphone7 with keynote

Hi Frank,

Did you try :

link-mtu 1440

or lower on the server config, and removing other MTU/MSS related settings? This made it work for me. What Rogers are doing is forcing your handset back to dual-stacked mode so that the connection will be over native IPv4 instead of 6to4 (NAT64) which will make it work again, but you should probably be thinking about enabling native IPv6 on your VPN anyway right?

In 99 out of a 100 cases you do not (should not!) want to mess with tun-mtu or link-mtu.
If your provider screws up UDP traffic then you should first try
  fragment 1400
  mssfix
before attempting anything else - that way, the default MTU is left intact but the OpenVPN data traffic is broken into smaller fragments.

If that does not work, then try getting a tcpdump log on both client and server side, to see which packets are mangled and/or dropped.

HTH,

JJK




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