[gentoo-user] How to determine what ethernet is doing

[reader@newsguy.com]

How to learn what ethernet connections are passing and how they are
setup?

I haven't had to do something like this for quite a while and have
forgotten how to go about it.

I have two ethernet adaptors but using only one, a gigabit ethernet
card.

I want to determine if it is actually passing a gigabit of data as
advertised.

What do I use to get that kind of info?

Dmesg id's it like this:
  r8169 Gigabit Ethernet driver 2.2LK loaded
  ACPI: PCI Interrupt 0000:02:03.0[A] -> GSI 19 (level, low) -> IRQ 177
  eth0: Identified chip type is 'RTL8169s/8110s'.
  eth0: RTL8169 at 0xf8840f00, 00:40:f4:b5:29:41, IRQ 177

Ifconfig, like this:

eth0      Link encap:Ethernet  HWaddr 00:40:F4:B5:29:41  
          inet addr:192.168.xxx.xxx  Bcast:192.168.0.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:7723745 errors:0 dropped:0 overruns:0 frame:0
          TX packets:7978529 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:3009127191 (2869.7 Mb)  TX bytes:2812484270 (2682.1 Mb)
          Interrupt:177 Base address:0xf00 


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