If the clients are getting their network configuration by DHCP, they almost certainly need to know how to route out of the subnet that they are on — in other words, to receive information about their default route when they get their address. This information is provided by the line containing option routers.
option routers 192.168.1.254;
In this case, the default route for all clients that get their network information by DHCP from this server will be via 192.168.1.254.
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