Switch DSL to cable modem causes Time Capsule "Flash on Activity" nonstop?

I recently switched from DSL to Cable internet. After I switched, the green light on the Time Capsule CONSTANTLY flashes -- as if there's constant activity. The Time Capsule was set to "Flash on Activity" when it was attached to the previous DSL modem and it only flashed when there was obvious activity. Now it flashes constantly green -- even when all devices are turned off.
I have ruled out anyone lurking on my wifi. Even after resetting the wireless password, the green light again immediately starts flashing constantly.
I've searched and searched the Internets for anyone with a similar issue, but have yet to find one.
Should I be concerned? Should I just let it flash? I like to see when there's activity on the Time Capsule, but now watching it flash all the time just makes me paranoid.
P.S. It also does the same thing when hooked up to an 802.11n AirPort.
Thoughts?

The Duke of WIndsor wrote:
It's distressing to think that there are constant break-in attempts. I assume that's what the firewall is for, so I guess I'm ok.
You should be OK. Not all of it is break-in attempts. A lot of it is just your neighbors' computers sending packets to advertise that they have a file share open. Or a printer. Before I got a router/firewall, I was really surprised at how many people had wide open file shares or shared printers. And some traffic will be from Comcast, too.
I'm not sure if I'm port forwarding. I just have a typical Time Capsule wifi setup.
You probably aren't if you're not sure. It's definitely not set up that way out of the box. Port forwarding would be if you wanted to allow a server on a computer inside your home network. I forward a port so I can log into the UNIX shell on my computer from my work.
The main two things you want to look at are to open the AirPort Utility and look at the "AirPort" section's "Time Capsule" page. There's a checkbox for "Allow setup over WAN." You want that to be unchecked (blank). And if you go to the "Advanced" page, under "Logging & Statstics" there's a setting for "Allow SNMP" and a sub-setting for "Allow SNMP over WAN." It's most critical that "Allow SNMP over WAN" also be unchecked (blank). Those two settings could allow someone from outside your home network to mess with the Time Capsule. The other thing is to make sure you have a good password both to join the network and to actually administer your Time Capsule.
The thing that confuses me the most about the flashing on activity issue is that millions of people have comcast cable internet and I assume many thousands use a Time Capsule or an Airport for wifi and yet I have been completely unable to find any mention of anyone having this same problem.
I've seen it mentioned in cable-modem specific forums, like the Comcast forums or DSL Reports. I've had a cable modem for close to 15 years. For the first couple of years, I didn't see the activity light blink like it does now. But that changed not long after I got the cable modem, maybe when they replaced an old one with a different brand.
I remember seeing quite a few posts about it then, but I suppose people just got used to it after a while. And it's not limited to the Time Capsule: I've had three or four other firewall/router devices from other manufacturers, and they all had the blinking activity lights, too.
charlie

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