The option mtu_fix was already inside my 'WAN' zone, so I went ahead and added it to my 'LAN' zone instead and lo' and behold everything started working.

Thanks again,

On Wed, May 31, 2017 at 12:59 PM Jason A. Donenfeld <Jason@zx2c4.com> wrote:
Set the mtu_fix boolean to 1 in your firewall config.
https://wiki.openwrt.org/doc/uci/firewall
--
Ibrahim Tachijian

CEO Net Sat AB
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