I have two offices using the same Linksys router, and both are showing open UDP ports when doing a port scan from outside using AATools port scan module. The router is the Linksys BEFSX41. I have a few open TCP ports that I manually configured in port forwarding, but the UDP ports I see open are a mystery to me. The following UDP ports show open when using AATools, 389, 6838, 9325, 10067, 10167, 10666, 12623, 18753,
20433, 26274, 27444, 31789, 31791, 34555, 35555, & 47262. I am under the assumption that only the ports that I forward are the only ports I should see open, so I have to assume that the router/firewall is not doing it's job properly. I understand that if a program opens the ports for data to come back in, it will show these ports as open, but I can't find anything running on the local PCs that would be opening these ports. I also assumed that the firewall in these Linksys devices are suppose to block everything and only allow what you forward. Any help on this matter would be greatly appreciated.
Frank Clyde Development Corp.