Can i limit the bandwidth used in the oracle database

hi guys
my database is centralized on linux 4 OS and we have above than 400 client connect to it, and the network bandwidth size is compatible but every day from 1:00 PM to 3:00 PM the network become slowdown because there are consuming the network bandwidth, all of the clients from 1:00 to 3:00 they are send the requests to the database and for that reason the network become slow for the huge of transaction.
so we don't want to increase the bandwidth.
NOTE:-
all the client can send the requests from 7:00 AM upto 5:00 PM
is there any configuration file or parameter that allow me to control the bandwidth to each client ?
with my regard

It would be easier to throttle traffic at the network level than the sqlnet level.
If you use sqlnet over ssh you get encryption in addition to some compression. (I have not tested this)
Some user education may help - e.g tell them to use proper select criteria instead of big searches.
Some application development may help - e.g move more processing from the client to the DB.

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