@stephenw10 Yes Steve, Zen uses IPv6.
I'm running 2.4.4 here and have had no problems. The WAN ethernet is Intel i211 (igb driver).
[2.4.4-RELEASE][admin@x]/root: ping6 -D -s 1452 -c 4 pfsense.org
PING6(1500=40+8+1452 bytes) 2a02:x:x:x:x:x:x:x --> 2610:160:11:11::69
1460 bytes from 2610:160:11:11::69, icmp_seq=0 hlim=250 time=123.880 ms
1460 bytes from 2610:160:11:11::69, icmp_seq=1 hlim=250 time=123.528 ms
1460 bytes from 2610:160:11:11::69, icmp_seq=2 hlim=250 time=123.517 ms
1460 bytes from 2610:160:11:11::69, icmp_seq=3 hlim=250 time=132.205 ms
--- pfsense.org ping6 statistics ---
4 packets transmitted, 4 packets received, 0.0% packet loss
round-trip min/avg/max/std-dev = 123.517/125.782/132.205/3.711 ms