slurm is a generic network load monitor which shows device statistics together with a nice ascii graph. Three different types of graphs are supported.
Read answer to: "Debian / Ubuntu: Console Based Network Load Monitor"
Debian / Ubuntu: Console Based Network Load Monitor
Howto: Display list of modules or device drivers in the Linux Kernel
CentOS / RHEL: Install vnStat Network Traffic Monitor To Keep a Log Of Daily Traffic
Linux route add command 
TCPDump: Capture and Record Specific Protocols / Port
Linux Track NFS Directory / Disk I/O Stats
OpenBSD: Configure Network Interface As A Bridge / Network Switch
Linux See Ethernet Statistics
Linux display summary of protocol-level statistics for all network interfaces
Linux Network Statistics Tools / Commands
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