|Normally you start simple and then move on to the more complex.|
Have your bro tell you what the netgear router wan ip is.
Have your bro tell you if remote management is set to http or https.
Have your bro confirm port 8080.
Then just http(s)://wanipaddress:8080 and see if you connect.
If not then confirm the settings. If they check outt then move on to the modem.