what's wrong with rtadvd?!

[Wojciech Puchar]

on 3 machines - works fine.

on one - doesn't

tcpdump -i em0 -n ip6 shows nothing transmitted

ifconfig em0 shows
em0: flags=88843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST,STATICARP> mtu 
1500
         options=4b<RXCSUM,TXCSUM,VLAN_MTU,POLLING>
         inet6 fe80::21b:21ff:fe00:9e16%em0 prefixlen 64 duplicated scopeid 
0x1
         inet 10.254.1.248 netmask 0xfffffc00 broadcast 10.254.3.255
         inet 10.254.1.232 netmask 0xfffffc00 broadcast 10.254.3.255
         inet6 xxxxxxx::2 prefixlen 64
         inet6 xxxxxxx::3 prefixlen 64
         inet6 xxxxxxx::4 prefixlen 64
         ether 00:1b:21:00:9e:16
         media: Ethernet autoselect (1000baseTX <full-duplex>)
         status: active


in rc.conf
rtadvd_enable="YES"
rtadvd_interfaces="em0"



when rtadvd is started, stopped or sometimes in between there are such 
things in log:
rtadvd[68450]: <ra_output> sendmsg on em0: Network is down



where's a problem?

thanks.


PS. no - firewall doesn't block it, i checked and tried with ipfw turned 
off too.