I follow this guide to set static IP for my BBB with Debian 
9.3: http://derekmolloy.ie/set-ip-address-to-be-static-on-the-beaglebone-black/
My /etc/network/interfaces file is modified to be as follow:
---------------------------------------------------------------------------------------------
# interfaces(5) file used by ifup(8) and ifdown(8)
# Include files from /etc/network/interfaces.d:
source-directory /etc/network/interfaces.d

auto lo
iface lo inet loopback

# Primary / Ethernet port
auto eth0
iface eth0 inet dhcp
address 192.168.0.20
netmask 255.255.255.0
gateway 192.168.0.1

# Secondary / Wifi RT5370
iface *wlxe84e0650ff53* inet static
address 192.168.0.21
netmask 255.255.255.0
network 192.168.0.0
gateway 192.168.0.1
---------------------------------------------------------------------------------------------

After that, my ethernet IP is not set to ...20, but ...18 as before.  On 
the wifi side, I did not put *usb0* because it shows up as *wlxe84e0650ff53* 
when 
I use ifconfig.  Anybody know why?  The extra settings completely kills 
it.  I got no wifi, unless I comment out these new lines.  Can someone tell 
me what went wrong?

I did read this 
post: 
https://groups.google.com/forum/#!searchin/beagleboard/fixed$20ip|sort:date/beagleboard/3bea2o4iD2s/pFz_VNrvDAAJ
However, I do not know if "[my] router can assign a fixed address or lock 
the one it assigns" or how to check for that info.  Right now, the username 
and password for it are not known either.  

Thank you so much.

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