Sorry I always forget to post the version / hardware
On that m0n0wall box
I use 1.3 with Compaq 733 MHz 128mb RAM onboard Intel 82801BA/CAM (ICH2/3)
Pro/100 Ethernet as WAN and
3Com 3c905C-TX Fast Etherlink XL as LAN interface.
I have about 18 m0n0wall boxes running same version and 1.3b13 I did not see
that error before.