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init.d services have a number appended to them. This is the order in which the services are started and stopped during startup/shutdown. The services need to be started in order to provide dependencies between the services. starting or stopping a service with /etc/init.d/ does not provide the dependency. Often this does not matter. Using the service command is the 'new way' of starting/stopping services as this checks dependencies before starting/stopping the service.
for your service, have you tried 'service rwalld stop' or '/etc/init.d/rwalld stop'?
The file /etc/services is just a lookup table linking service names to port numbers. As you might know, networks work with numbers, not with names.
telnet somehost smtp
The telnet program will lookup 'somehost' to get the IP address of it by using whatever is specified in resolv.conf (dns, file /etc/hosts) and it will lookup 'smtp' in /etc/services. Internally it will use the IP address and the port number.