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Subjectpeeking with tokenring on linux laptop
DateFri, 3 Jan 1997 14:28:48 PST
From"Marty Leisner" <>

I want to use tcpdump to peek at a token ring network (running
primarily netbeui and ipx) with linux 2.0.27 on a laptop...

Ethernet works fine, I'm not sure I under what Link encap: UNSPEC
means on tr0...

How do I read tr0 on tcpdump?

oadin device 'eth0'...
eth0: 3Com 3c589, port 0x300, irq 3, 10baseT port,  00 60 97 48 25 83
Adding Swap: 23148k swap-space
ibmtr_cs.c 1.10 1996/01/06 05:19:00 (Steve Kipisz)
ibmtr_attach()
ibmtr_event()
ibmtr_config(0x0102cde0)
tr0: port 0xa20, irq 5, mmio 0xd2000, sram 0xd4000,
  hwaddr=0020AF226343
tr0: Initial interrupt : shared RAM located at 000D42D4.
tr0: Adapter initialized and opened.
loading device 'eth0'...
eth0: 3Com 3c589, port 0x300, irq 3, 10baseT port,  00 60 97 48 25 83
: leisner@toshiba;ifconfig
lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Bcast:127.255.255.255  Mask:255.0.0.0
          UP BROADCAST LOOPBACK RUNNING  MTU:3584  Metric:1
          RX packets:14 errors:0 dropped:0 overruns:0
          TX packets:14 errors:0 dropped:0 overruns:0

tr0       Link encap:UNSPEC  HWaddr 00-20-AF-22-63-43-00-EC-00-00-00-00-00-00-00-00
          inet addr:13.231.132.161  Bcast:13.231.135.255  Mask:255.255.252.0
          UP BROADCAST RUNNING  MTU:2000  Metric:1
          RX packets:8347 errors:0 dropped:0 overruns:0
          TX packets:282 errors:0 dropped:0 overruns:0
          Interrupt:5 Base address:0xa20 

eth0      Link encap:10Mbps Ethernet  HWaddr 00:60:97:48:25:83
          inet addr:13.231.132.161  Bcast:13.231.135.255  Mask:255.255.252.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:48785 errors:0 dropped:0 overruns:0
          TX packets:396 errors:0 dropped:0 overruns:0
          Interrupt:3 Base address:0x300 

 leisner@toshiba;tcpdump -i tr0 not ip
tcpdump: snoop: unknown physical layer type


marty		leisner@sdsp.mc.xerox.com   
Don't  confuse education with schooling.
	Milton Friedman to Yogi Berra

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