On 9/27/11, Muhammad Panji <sumodirjo at gmail.com> wrote: > Dear All, > I have an onboard Realtek RTL8111/8168B NIC. from lspci -vv : > > 02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. > RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 02) > > It is detected, but why the speed is always 100Mbps, already change > cable but still no luck. I use ethtool and from the output it seems > that system know that this NIC support gigabit speed : What network switch is this connected to? Does it work if you disable auto-negotiation and force the link speed to 1Gbps?