[Fedora-xen] network problem after upgrade...

hi, i had two machines (shutdown and init) dedicated as domain0 with fc6 and xen installed. Both machines has guest domains deployed. Last days, i decided to update the shutdown machine with kernel and xen packages, using update software tool (aka. pup). As consequence my old guest domains in shutdown machine has network problems, cannot communicate outside, then i decide to deploy a new guest domain, after to updating process, and it does not have any problems. The problem appear with old guest domains. :-( But, the old guest domains in init machine (with no updates) work properly. any suggestion? thanks a lot. init xen-packages and kernel running version kernel-xen.i686 2.6.19-1.2911.6.5.fc6 installed kernel-xen.i686 2.6.18-1.2798.fc6 installed xen.i386 3.0.3-6.fc6 installed xen-libs.i386 3.0.3-6.fc6 installed (uname -a) Linux init 2.6.19-1.2911.6.5.fc6xen #1 SMP Sun Mar 4 16:59:41 EST 2007 i686 i686 i386 GNU/Linux shutdown xen-packages and kernel running version kernel-xen.i686 2.6.20-1.2952.fc6 installed kernel-xen.i686 2.6.19-1.2911.6.4.fc6 installed xen.i386 3.0.3-9.fc6 installed xen-libs.i386 3.0.3-9.fc6 installed (uname -a) Linux shutdown 2.6.19-1.2911.6.4.fc6xen #1 SMP Sat Feb 24 14:57:17 EST 2007 i686 i686 i386 GNU/Linux http://ece.uprm.edu/~s047267 http://del.icio.us/josanabr http://blog-grid.blogspot.com