Some more info on what I see on the firewalls.

On the LOCAL-ROUTER, testing the 2 ping"types", with and without the added 
address


"without"

        ping6 -c1 2600:x:x:4dff::1
                PING 2600:x:x:4dff::1(2600:x:x:4dff::1) 56 data bytes
                64 bytes from 2600:x:x:4dff::1: icmp_seq=1 ttl=64 time=27.4 ms

                --- 2600:x:x:4dff::1 ping statistics ---
                1 packets transmitted, 1 received, 0% packet loss, time 0ms
                rtt min/avg/max/mdev = 27.488/27.488/27.488/0.000 ms

        firewall log @ LOCAL-ROUTER
                Aug 21 11:19:20 local01 kernel: [96663.073933] 
SW:[P6][DBG]:ACCEPT IN= OUT=tun1 SRC=2600:x:x:4dff:0000:0000:0000:0002 
DST=2600:x:x:4dff:0000:0000:0000:0001 LEN=104 TC=0 HOPLIMIT=64 FLOWLBL=0 
PROTO=ICMPv6 TYPE=128 CODE=0 ID=20070 SEQ=1 

        firewall log @ REMOTE-SERVER
                Aug 21 11:19:20 remote01 kernel: [ 5194.195094] 
SW:[P6][DBG]:ACCEPT IN=tun1 OUT=  SRC=2600:x:x:4dff:0000:0000:0000:0002 
DST=2600:x:x:4dff:0000:0000:0000:0001 LEN=104 TC=0 HOPLIMIT=64 FLOWLBL=0 
PROTO=ICMPv6 TYPE=128 CODE=0 ID=20070 SEQ=1 


"with"

        ping6 -c 1 -I 2600:x:x:4d09::1  2600:x:x:4dff::1
                PING 2600:x:x:4dff::1(2600:x:x:4dff::1) from 2600:x:x:4d09::1 : 
56 data bytes
                ... NOTHING ...

        firewall log @ LOCAL-ROUTER
                Aug 21 11:20:33 local01 kernel: [96735.664650] 
SW:[P6][DBG]:ACCEPT IN= OUT=tun1 SRC=2600:x:x:4d09:0000:0000:0000:0001 
DST=2600:x:x:4dff:0000:0000:0000:0001 LEN=104 TC=0 HOPLIMIT=64 FLOWLBL=0 
PROTO=ICMPv6 TYPE=128 CODE=0 ID=20155 SEQ=1 

        firewall log @ REMOTE-SERVER
                ... NOTHING ...

- John

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