TRENDnet TV-IP100 - Manual (Page 43)

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Q: Can the Internet Camera be installed and work if a firewall
exists on the network?
A: If a firewall exists on the network, port 80 is open for
ordinary data communication. However, since the Internet
Camera transmits image data, the default port 8481 is also
required. Therefore, it is necessary to open port 8481 of the
network for remote users to access the Internet Camera.
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B PING Your IP Address
The PING (Packet Internet Groper) command can determine
whether a specific IP address is accessible by sending a packet to
the specific address and waiting for a reply. It can also provide a
very useful tool to confirm if the IP address conflicts with the
Internet Camera over the network.
Follow the step-by-step procedure below to utilize the PING
command. However, you must disconnect the Internet Camera
from the network first.
Start a DOS window.
Type ping x.x.x.x, where x.x.x.x is the IP address of the Internet
Camera.
The succeeding replies as illustrated below will provide useful
explanation to the cause of the problem with the Internet Camera
IP address.