On Saturday August 20 2016 16:41, you wrote to Björn Felten:
BF>> [2602:306:bd31:aa50:e23f:49ff:fead:fa9]...
RQ> I am running Debian Linux (Jessie). When I type ifconfig, I get RQ> fe80::e23f:49ff:fead:fa9/64 as the IPv6 address.
You should get more that one. Addresse starting with fe80:: are so called link local adresses. They are only valid on the local link.
Note however that the lower 64 bits of that link local addres are the same as that in the unique global address that is in your host name. e23f:49ff:fead:fa9
Also note the ff:fe in the middle. This tells me it is a so called SLAAC addres. The lower 64 bit or the host part of the address is derived form yoy MAC address. Remove the FF:fe and invert leat but one significant buye of the most significant nibble en you get e0:3f:49:ad:0f:a9 as your MAC address.
RQ> I am not in the same town as that computer and cannot further test the RQ> IP address until I can get back home.
From the information I got so far I am 90% confident that 2602:306:bd31:aa50:e23f:49ff:fead:fa9 is the correct address.
When you get back home look at the firewall first.
