> When I type:
> ethereal -i ath0 -L
> (-i required, as ath0 is not default)
> I get:
> Data link types (use option -y to set):
>   DLT 1 (Ethernet)
>   DLT 127 (IEEE 802.11 plus BSD WLAN header)
>   DLT 105 (IEEE 802.11 Wireless LAN)
>

Interesting, because i type:
>ethereal -i ath0 -L
I [just] get:
Data link types (use option -y to set):
  DLT 1 (Ethernet)

when type:
ethereal -v
I get:
ethereal 0.10.9
Compiled with GTK+ 2.6.2, with GLib 2.6.2, with libpcap 0.4, with libz
1.1.4,
with libpcre 5.0, with Net-SNMP 5.1.2, without ADNS.

Running with libpcap (version unknown) on NetBSD 2.0.

I'm currious what version you are running?

jam