wi0, cannot ping but wlan is up

[C. Kukulies]

ifconfig wi0 on my Dell 8000 (two days old cvsup) shows that the WLAN is up
on the right SSID, adhoc mode, 2Mbit. But the interface didn|t get the
address from dhclient. I stopped dhclient and set the address manually.
Set default route manually.

When I ping the peer point, my gateway machine, I get sendto: host is down.

At the same time I see reachtion via tcpdump on the peer (gateway)
side:
# tcpdump: listening on wi0
20:25:01.474063 arp who-has 192.168.254.1 tell kukubook2k
20:25:01.474194 arp reply 192.168.254.1 is-at 0:2:2d:49:91:ce
20:25:02.480821 arp who-has 192.168.254.1 tell kukubook2k
20:25:02.480899 arp reply 192.168.254.1 is-at 0:2:2d:49:91:ce
20:25:03.490909 arp who-has 192.168.254.1 tell kukubook2k
20:25:03.490971 arp reply 192.168.254.1 is-at 0:2:2d:49:91:ce
20:25:04.500925 arp who-has 192.168.254.1 tell kukubook2k
20:25:04.500991 arp reply 192.168.254.1 is-at 0:2:2d:49:91:ce
20:25:05.511001 arp who-has 192.168.254.1 tell kukubook2k
20:25:05.511068 arp reply 192.168.254.1 is-at 0:2:2d:49:91:ce
20:27:12.614890 192.168.254.1 > kukubook2k: icmp: echo request
20:27:13.617743 192.168.254.1 > kukubook2k: icmp: echo request
20:27:14.627750 192.168.254.1 > kukubook2k: icmp: echo request
20:27:15.706424 192.168.254.1 > kukubook2k: icmp: echo request
20:27:16.707795 192.168.254.1 > kukubook2k: icmp: echo request
20:27:17.717808 192.168.254.1 > kukubook2k: icmp: echo request
20:27:18.727827 192.168.254.1 > kukubook2k: icmp: echo request
20:27:19.737851 192.168.254.1 > kukubook2k: icmp: echo request
20:32:01.697642 arp who-has 192.168.254.1 tell kukubook2k
20:32:01.697730 arp reply 192.168.254.1 is-at 0:2:2d:49:91:ce
20:32:02.706892 arp who-has 192.168.254.1 tell kukubook2k
20:32:02.706975 arp reply 192.168.254.1 is-at 0:2:2d:49:91:ce         

The arp requests are the consequence of the ping from my
notbook to the peer, while the icmp: echo request is the
ping from my notebook.

Could it be a firewall issue? I have not changed anything and have
firewall_enable=NO in rc.conf.

Any ideas?

--
Christoph P. U. Kukulies kuku_at_physik.rwth-aachen.de