Thanks for the additional information it would seem that your dhcp is giving the broadcast as 255.255.255.255 as indicated by: "option broadcast-address 255.255.255.255". Do you have any other dhcp clients that you could confirm this with?
-- Networkmanager applet give a wrong broadcast address https://launchpad.net/bugs/92011 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
