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Check the virtual machine configuration for classless static routes under RFC3442
Windows 7 VM
A Windows 7 VM will accept the option 249 classless static routes without any special configuration.
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Check that the following two files exist on the system and are not empty:
/etc/dhclient.conf/etc/dhclient-exit-hooks
The contents of these files should be as described in Configuring DHCP#Configure CentOS VM Template to Receive Static Routes by DHCPat /wiki/spaces/ABI54/pages/310740115