DoS Attack: SYN/ACK Scan

While I (personally) sort of like seeing that my devices are renewing their IP leases twice a day, my impression is that the default lease probably can be changed.  According to what I find by searching the web, a DHCP lease can be as long as 135 years.  This one article recommends various lease times for specific situations:

https://www.informit.com/articles/article.aspx?p=30874&seqNum=3 

Notice that they are describing a situation where different DHCP "pools" are used for different purposes (student labs vs. servers, etc.)

Orbi has only a single DHCP pool.

When I telnet into my Orbi and display parameters using the command

nvram show | grep dhcp

(display all the parameters and pass them through the program "grep" to list only those with the string "dhcp" in it)

One of the lines that shows up is this:

dhcpc_lease_time=86400

86,400 seconds is one day (60x60x24).  So, in theory, one could change that to a different value by typing:

config set dhcpc_lease_time=864000

config commit

This would create a lease time of 10 days.  Please understand:

• I would for certain make a backup of the Orbi configuration in case this goes horribly wrong and I am forced to Factory Reset the Orbi.
• I have not done this myself