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Everything works fine over Wi-Fi.

I tried disabling IPv6 using a provisioning profile.

I tried on two different devices (iPhone 6 and current iPhone SE) using the same VPN provisioning profile (each device on its own LTE carrier).

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Figured it out! It was a MTU issue.

The following iptables rules saved the day!

-A FORWARD -p tcp -m policy --dir in --pol ipsec -m tcp --tcp-flags SYN,RST SYN -j TCPMSS --set-mss 1280
-A FORWARD -p tcp -m policy --dir out --pol ipsec -m tcp --tcp-flags SYN,RST SYN -j TCPMSS --set-mss 1280

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