[ubuntu] need frame error monitor

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http://ubuntuforums.org – I am using Lucid. I have an increasing rate of frame errors. I suspect a 20 meter cable that I am using. I want to view the frame errors in real-time, so that I can test the movement of the cable. ifconfig gives this output: eth0 Link encap:Ethernet HWaddr 00:07:e9:5e:cb:88 inet addr: Bcast: Mask: inet6 addr: xxxxxxxxxxxxxx Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:11142 errors:78 dropped:0 overruns:0 frame:78 TX packets:10978 errors:0 dropped:0 overruns:0 carrier:0 (HowTos)