[astrophys]

Thank you knc1! There's some misunderstanding initially but Branch has clarified this for me.

The only obstacle is to set up the DNS forward to "a" on my mac. I tried internet sharing on my mac to share thunderbolt ethernet connection to wifi (which kindle connects to), but failed to find any option to redirect DNS to "a" in this path (changing /etc/hosts does work for web browser on mac, but not for any device connects to wifi from mac). I do not have any other ways since I can not change university public ethernet or wifi. Maybe I can only try this on my house router later...