Windows 7 - Sharing a connection with an old MS-DOS 6.22 machine

I have a Compaq Portable II running MS-DOS 6.22 (from a 20, count'em, 20 megabyte hard drive). For retrocomputing purposes, I'd like to run DosLynx, ssh/telnet and a (yet to be defined) IRC client on it.
I can't connect it straight to my router (too far away, impractical to run a cable), so I want to connect it to my main computer, running Windows 7 x64 and with a wifi link to the router.
I configured connection sharing in Windows 7, then found a DOS packet driver for the ethernet card in the Portable II (an AMD PCNET one). Said driver apparently works (I run it with INT=0x60 and it autodetects the other settings), but then I've no idea what to do. Doslynx reports a DHCP error every time I try connecting to a website.

Little help?

DOS probably can't handle what you are trying to feed it and/or just not going to happen via Windows 7, M$ is a fan of end of life support cycles... and this is way beyond...

Good luck though, I was an old QEMM guru back in the day.

I thought ethernet communication was universal?

I tried running a long cable straight to the (DHCP-enabled) router, and the old computer behaves exactly the same...