VintageNet.Route.IPRoute.add_rule

You're seeing just the function add_rule, go back to VintageNet.Route.IPRoute module for more information.
Link to this function

add_rule(ip_address, table_index)

View Source

Specs

add_rule(:inet.ip_address(), VintageNet.Route.Calculator.table_index()) ::
  :ok | {:error, any()}

Add a source IP address -> routing table rule