用ifconfig得到下面的结果:
eth1 Link encap:Ethernet HWaddr 00:07:E9:BE:21:45
inet addr:127.0.0.1 Bcast:192.168.0.1 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:343277020 errors:1 dropped:0 overruns:0 frame:1
TX packets:466967452 errors:0 dropped:0 overruns:8 carrier:0
collisions:0 txqueuelen:100
RX bytes:3513639187 (3350.8 Mb) TX bytes:3672259989 (3502.1 Mb)
Interrupt:11 Base address:0xdd80 Memory:feafd000-feafd038

lo Link encapocal Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:684995 errors:0 dropped:0 overruns:0 frame:0
TX packets:684995 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:37610343 (35.8 Mb) TX bytes:37610343 (35.8 Mb)
我想知道下面的是什么意思?

重点想知道:
RX bytes:3513639187 (3350.8 Mb) TX bytes:3672259989 (3502.1 Mb)是什么意思?
和
RX bytes:37610343 (35.8 Mb) TX bytes:37610343 (35.8 Mb)
是什么意思?