Lately, new generation of Davicom's el-cheapo USB-Ethernet dongles
flooded the market. They can be bought for as cheap as ~2$ per (new)
piece, and unlike precedors, works quite reliably (no more MTU
problems, it seems - at least they don't spazm out after ping -s
1400).
There is one problem,
Ps.
To save searching, here are qf9700 modules for linux and sources + as
(probably useless) addition, android copy of those:
http://lorienart.pl/qf9700.tar
AIUI, any version included in any devel distro is copy of those,
(linux, not android ones), just compiled for matching kernel.
/Estel