I have the exact same modem (C1000A) and use an Airport Extreme as the router. But we have had some issues where the WiFi shows connected on an iOS device but the internet connection was lost. We turned off the Wireless on the Modem so our devices would only see the AE WiFi, but we still had dropped connection issues. The modem was just swapped out today for a new one (same model). After spending hours looking at the Modem Utility page and Airport Utility, then researching questions about the info, I think I found the right group of people to help me. Below are some of the questions I am trying to figure out.
1. If the AE is in bridge mode will the Firewall of the AE still function properly?
2. If the AE firewall is working will it be ok to turn off the Modem firewall if it is part of the problem with our internet connection getting dropped? I ask this because the system log for the Modem has tons of messages saying Firewall Drop: IN=br0 Out = MAC=(with some numbers which i recognize one set as the MAC address for an iPad) and SRC=, DST=, etc. I'm not sure what that message means but Firewall Drop doesn't sound good. The log also had a lot of wireless device connected and disconnected messages. The same with Ethernet connections.
3. Or is it a better idea to use the Modem in bridge mode and have the AE be in DHCP and NAT mode? I read on one website that the C1000A modem can be in transparent bridge mode which will allow the router to issue the IP address for all the Network devices and be the Internet connection by using my DSL credentials from my ISP with the AE. (lots of acronyms i didn't know before this all happened đ)
4. The Tech that came out today thought using the AE was an unnecessary step in the whole internet/wireless process. He also thought a Firewall on the modem, computer and AE, all active, was useless and only one thing needed its firewall functioning (his suggestion was the computer). If thats the case what is protecting my other wireless devices? (iPhone, AppleTV, Laptops)
I really just want a secure and correctly functioning internet and wireless set up in my home. Any help would be greatly appreciated!!
Thanks, Gayla
p.s. Let me know if i need to clarify anything. I'm also sorry, in advance, if your answers bring a ton more questions.