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When trying to configure IPX, I noticed that if I configure it manually, and set up 802.2 or 802.3 frames, then the ifup-ipx supplies ipx_interface with 802_2 and 802_3 as the frametype instead of 802.2 and 802.3. ipx_interface churns out an error message and IPX is not correctly initialised. I looked at the code in ifup-ipx and there seems no attempt to change the $interface variable (maybe a new version of ipx_configure doesn't like the underscores?) Hope this helps.
this has been fixed in a later initscripts.