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I'm not an expert on routers by any means, but are these 40-dollar home routers, which he presumably has, built to handle concurrent traffic from 14 clients?
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Unless he has two "points of presence" or POPs (two ISP connections) all the traffic is being shoved into one tiny pipe anyway at the gateway device (modem). The router can handle about 254 devices.
As far as traffic, it is not likely all connected devices are moving lots of data onto or off the Internet at once. If they are, then
NO home router or home gateway device will be able to keep up and it is time to invest in some business class network hardware and it is time to pay the ISP for a bigger pipe.
But if we are talking local network traffic, then go with a 1Gb LAN.
If the concern is simply about the wireless devices, then as Core correctly notes, straddling wireless access to 11g is not helping - especially if the network also includes some 11n devices. Mixing protocols on the same wireless network
ALWAYS bogs down wireless access - unless you specifically buy a "
Simultaneous Dual-Band" wireless access device. Not just "Dual-Band", but
Simultaneous Dual-Band".
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To make you home network more secure go to your routers home web page and disable SSID broadcast.
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This really has no effect on security as it will not keep out even the most amateurish wannabe hacker. All disabling SSID broadcasting does is keep the nosy neighbor whiz kid from seeing that you have a network when he searches for "hotspots", then running through your kid's or dog's names trying to guess the passphrase. The fact of the matter is, whether disabled or not, the SSID is transmitted in clear text in the packet stream so any wannabe with a scanner and easily available sniffer software can see it anyway! So disabling it actually becomes an inconvenience for legitimate users wanting connect a new device while providing absolutely no protection from someone seeking to gain unauthorized access.
Myth vs. reality: Wireless SSIDs
Service set (802.11 network)
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Unfortunately, turning off the broadcast of the SSID may lead to a false sense of security. The method discourages only casual wireless snooping, but does not stop a person trying to attack the network.[2]
It is not secure against determined crackers, because every time someone connects to the network, the SSID is transmitted in cleartext even if the wireless connection is otherwise encrypted. An eavesdropper can passively sniff the wireless traffic on that network undetected (with software like Kismet), and wait for someone to connect, revealing the SSID. Alternatively, there are faster (albeit detectable) methods where a cracker spoofs a "disassociate frame" as if it came from the wireless bridge, and sends it to one of the clients connected; the client immediately re-connects, revealing the SSID
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