Create a new custom parameter group:

shell> rds-create-db-parameter-group repgroup -d 'Parameter group for DB Replicas' -f mysql5.1

Where repgroup is the replicator group name.

Set the new parameter value:

shell> rds-modify-db-parameter-group repgroup --parameters \
"name=max_allowed_packet,value=67108864, method=immediate" 

Apply the parameter group to your instance:

shell> rds-modify-db-instance instancename --db-parameter-group-name=repgroup

Where instancename is the name given to your instance.

Restart the instance:

shell> rds-reboot-db-instance instancename

Login to the AWS Console using your account credentials and navigate to the RDS Dashboard. From here, select "Parameter Groups" from the left hand list

Figure 3.3. Fig 1. AWS Config

Select the "Create Parameter Group" Button to the top right

Figure 3.4. Fig 2. AWS Config

This dialog will now allow you to create a new parameter group using an existing one as a template. Select the appropriate template to use and complete the rest of the details. You need to create a DB Paramater group and a DB Cluster Parameter Group

Figure 3.5. Fig 3. AWS Config

Figure 3.6. Fig 4. AWS Config

Figure 3.7. Fig 5. AWS Config

Now you have the two groups, you can modify the parameters accordingly, by selecting the group in the list and then selecting the "Edit" option.

Figure 3.8. Fig 6. AWS Config

Figure 3.9. Fig 7. AWS Config

Now the groups are setup, you can assign these groups to existing Aurora Instances, or you can assign them during instance creation. If you are assigning to existing instances, you may need to restart the instance for certain parameters to take effect.