On Thu, Feb 07, 2013 at 10:07:59PM +1100, Bradley Baetz wrote: > What happens with USB network devices that are plugged into > different slots? Currently my iPhone shows up as eth1, but using the > above, depending on which of two adjacent ports I happen to plug it > into, I get: > > $ udevadm info --export -p /sys/class/net/eth1 | grep ID_NET > E: ID_NET_NAME_MAC=enx0226b08178a9 > E: ID_NET_NAME_PATH=enp0s29f7u1c4i2 > > $ udevadm info --export -p /sys/class/net/eth1 | grep ID_NET > E: ID_NET_NAME_MAC=enx0226b08178a9 > E: ID_NET_NAME_PATH=enp0s29f7u2c4i2 > > Will those be treated as two separate devices under this scheme > depending on which USB port I happen to use? And if so, will that > actually matter?
If you switch to MAC-based names, no, because the MAC isn't changing. If you use topology-based names (the default), then yes, the device name will change, and it will matter. The analogy I heard that defends this behavior is to think of the USB network device as a mere converter between USB and the network -- you wouldn't expect to be able to plug a network cable into an arbitrary slot, would you? -- Scott Schmit
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