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Are you sure you got them all off? Have you used the netstat command to make sure that nothing is listening on port 100?
I have the same problem. Port 25 and 21 are shown as open when I scan remotely. There is no service listening on that port and I have the firewall set to explicityl block those 2 ports. I think it is my cable modem that shows them open, but I'm not sure.
So to answer question: It could be the modem.... or not.... But I know I have similar behavior that really seems to be the fault of my modem.
Distribution: OpenBSD 4.6, OS X 10.6.2, CentOS 4 & 5
Posts: 3,660
Rep:
A lot of times if you're on broadband and you scan from the outside (i.e. somewhere on the Internet) you'll actually hit a proxy server that your broadband provider is running. Many of them proxy services, or just flat out intercept and divert them.
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