Did you read my post using iptables entry?? Problem solved.
>
>This worked under Windows 10. The Bone could access the internet fine.
>More likely -- "this worked under Windows 10" INTERNET CONNECTION
SHARING (ICS). A feature which has to be enabled/configured in Windows, it
is not automatic. When configured properly -- meaning the local and wide
area network NICs have been defined, and the firewall has had stuff opened
up to allow pass-through traffic, the Windows machine becomes an Internet
Gateway Router.>P.C. Now running Ubuntu 20.04.
>There is no "all in one" configuration. You have to adjust the Linux
routing tables, defining gateway ports, the NICs to route between, along
with setting up firewall rules. All actions that require some knowledge of
Linux and networking.
And *every* step must be followed and to make the setup *persistent*, some
steps need to be added to startup files *and* be done manually. Missing any
one step will cause things to stop working or not work at all.
Might be better to run a network cable connection from the BBB to the
(laptop? I presume it has an RJ45 jack somewhere) and try to configure
Linux to route a proper Ethernet connection to the WiFi rather than trying
to use the pseudo-device created over the USB connection. As has been
mentioned, that USB-gadget is really meant just to allow direct (SSH)
connection to the BBB for purposes of configuring it (if needed) with the
Ethernet connection being the primary networking link.
Actually, setting up a Linux machine to act as a router via its Ethernet is a
little MORE involved. For starters, you will have to install the DHCPD server
and then configure the DHCPD server, plus *ALL* of the "INTERNET CONNECTION
SHARING (ICS)" stuff. Oh, unless he also gets an Ethernet Switch, he would
want to get a Ethernet cross-over cable.
Given that the OP has no access to his router (and yes there is a router
somewhere in his living center) and is not really an expert Linux admin, his
best option is to just get a USB WiFi dongle and plug that into the USB A host
port on the BBB. Also, the BBB will actually run better when powered from the
5V DC coax power jack.
According to the BBB SRM, no cross-over cable would be needed.
"""
The PHY supports AutoMDX which means either a straight or a swap cable can
be used
"""
Odds are good that any modern laptop with an RJ45 jack would also
support that mode.