RPi Easy SD Card Setup - eLinux.org

Networking
Ethernet connection is lost when a USB device is plugged in
This is often caused by inadequate power. Use a good power supply and a good power
cable. Some cheap cables that work with a cell phone, cannot fully power the R-Pi. Some
USB devices require a lot of power (>100 mA), so they must be used with a powered
USB hub. Some cheap USB hubs suck power from the Raspberry Pi even if a USB power
supply is connected. (More often than not, however, the reverse is true with cheap
hubs—the Pi draws just enough power backwards from the powered hub to
unsuccessfully attempt booting.)
There is an ongoing issue with the Ethernet connection being lost when low-speed
devices, such as mice or keyboards are connected via a powered USB hub. The simplest
way to solve this is to connect your mouse and keyboard directly into the 2 USB ports on
the R-Pi (assuming they draw less than 100 mA apiece).
Ethernet connects at 10M instead of 100M
The LED in the corner of the board labelled "10M" is mislabeled. When that LED is on,
the R-Pi is actually connected at 100 Mbps. You can confirm the true transfer rate using a
network benchmark such as iperf. You can also read the current network speed with
cat /sys/class/net/eth0/speed
Cannot ssh in to Pi
In the Debian image, ssh is disabled by default. Boot commands are taken from /boot/
boot.rc if that file present. There is an example file named boot_enable_ssh.rc that
enables ssh. So:
sudo mv /boot/boot_enable_ssh.rc /boot/boot.rc
and reboot should enable ssh. (password as below)
Network/USB chip gets too hot to touch
This is normal. In open air at 24 C, the LAN9512 Ethernet/USB chip reaches about 52 C
after some time. This is too hot to touch for more than a few seconds, but it is not
unusually hot for the chip.