I currently get internet access through a USB modem.  I also have a
wifi network, but it is not connected to the internet; it only serves
to provide wireless access to my ethernet printer.  I have multiple
computers that presently share this USB modem (and by "share" I mean
unplugging it from one and plugging it into another).

So I was wondering if there was any way to use one of my computers as
an internet source for my wifi router.  In other words, I want to be
able to plug the USB modem into one computer, and then (wirelessly or
via a cable) connect that computer to the router, allowing other
computers connected to this router to use the USB internet connection. I
know next to nothing about networking, and was wondering what the best
way to accomplish this would be.

Also, if it is relevant, network-manager is not compatible with my
modem, so I'm using wvdial to connect.  After dialing up with wvdial, I
run "ip route change to default dev ppp0 via 12.34.56.78" when also
connected to wifi to circumvent network-manager, which expects my
wireless connection to also give me internet access.

Any help would be appreciated, even as far as relevant search terms...
any info available online about how to accomplish this is hidden by
info on how to make a computer's wireless card broadcast the signal,
rather than linking it to a wireless router.

Thanks,

-Max
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