Why the magic packet can wake_on_lan via lan instead of wan?

Question

My simple home internet environment:modem(pppoe) + router + pc. The modem is a FTTH device which is fiber to the home (FTTH),the delivery of a communications signal over optical fiber.
Setting in BIOS:

Advanced--Realtek Lan Controller--enabled
        --Realtek Pxe Option Rom--enabled
Advanced--APM--Power on by PCI-E

Setting in router:

the ip (192.168.31.52) and mac address are binded together

The start_lan.py script in my android's qpython3:

from wakeonlan import send_magic_packet
send_magic_packet('mac address of my pc')

Turn on wifi in my android phone and run start_lan.py from android's qpython3,my pc waked on lan via lan,succeeded!
Then i want to wake on lan via wan(external internet environment),there are two status to discuss,one status keep router in the web structure,the other don't.
Status 1:

modem(pppoe) + pc
#Remove router

Status 2:

Keep the web structure as same as wake_on_lan via lan.

Set port forwarding on my router:  

    name  protocol      external port        inner ip address   inner port
    wan   TCP and UDP   30000                192.168.31.52       9
    #the default port for wake on lan is 9.

When request my pc's public ip on the port 30000,it will be forwarded into 192.168.31.52 on the port 9.

Both of the two status use almost the same start_wan.py script in my android's qpython3: For status 1:

from wakeonlan import send_magic_packet
send_magic_packet('mac address of my pc',ip_address='public ip')

For status 2:

from wakeonlan import send_magic_packet
send_magic_packet('mac address of my pc',ip_address='public ip',port=30000)

Execute the script,my pc can't be waken!Does the FTTH device matter? How to fix it?

Did you forward **UDP** port 9? Typical port forwarding is TCP. — MSalters, Jan 19 '21 at 07:40

score 0 · Answer 1 · answered Jan 20 '21 at 05:08

Some ISP only open the well-known ports for users,change the port nmuber more small.

Set port forwarding on my router:

name  protocol      external port        inner ip address   inner port
wan   TCP and UDP   9                     192.168.31.52       9

It is verified that both status can use same code snippet such as below:

from wakeonlan import send_magic_packet
send_magic_packet('mac address of my pc',ip_address='public ip',port=9)

Why the magic packet can wake_on_lan via lan instead of wan?

1 Answers1