I finally broke down and patched the kernel. There are discussions here:

http://www.linuxquestions.org/questions/linux-networking-3/host-to-host-cable%3B-no-usb0-779573/
http://www.coding.com.br/usb/suporte-para-o-cabo-usb-host-to-host-prolific-pl-25a1-no-linux/

and a patch here
http://www.mail-archive.com/netdev@vger.kernel.org/msg61926.html

which does nothing but add ids for the 25A1... any reason this can't be
incorporated, seems pretty tame.

 static const struct usb_device_id      products [] = {
+       /* full speed cables */
+       {
+               USB_DEVICE(0x067b, 0x0000),     /* PL-2301 */
+               .driver_info =  (unsigned long) &prolific_info,
+       }, {
+               USB_DEVICE(0x067b, 0x0001),     /* PL-2302 */
+               .driver_info =  (unsigned long) &prolific_info,
+       },
+
+       /* high speed cables */
+       {
+               USB_DEVICE(0x067b, 0x25a1),     /* PL-25A1, no eeprom */
+               .driver_info =  (unsigned long) &prolific_info,
+       }, {
+               USB_DEVICE(0x050d, 0x258a),     /* Belkin F5U258 (PL-25A1) */
+               .driver_info =  (unsigned long) &prolific_info,
+       },

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https://bugs.launchpad.net/bugs/516923

Title:
  usb0 network not enabled with Prolific Technology, Inc. PL25A1 Host-
  Host Bridge

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