Using ifconfig command you see if multicasting is enabled for your network interface or not. [ali@lab ~]$ /sbin/ifconfig wlan0 wlan0     Link encap:Ethernet  HWaddr 00:24:D7:38:D5:7C inet addr:172.30.59.189  Bcast:172.30.59.255  Mask:255.255.255.0 inet6 addr: fe80::224:d7ff:fe38:d57c/64 Scope:Link UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1 RX packets:761458 errors:0 dropped:0 overruns:0 frame:0 TX packets:282314 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:334033669 (318.5 [...]

If you are getting following error messages during the boot,  one of your udev rules are using the ATTRS instead of SYSFS. grep ATTRS /etc/udev/rules.d/* Changing all occurrence of ATTRS with SYSFS will fix the problem. %s/ATTRS/SYSFS/g On the other hand this is quite a irony. Fedora 13 will give you a warning error stating [...]