switches or other devices which respond to Test frames?

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Subject	Author	Date
switches or other devices which respond to Test frames?	Rick Jones	05-23-08

Posted by Rick Jones on May 23, 2008, 2:31 pm

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Hi -

HP-UX (and MPE before it IIRC) has a utility called "linkloop" which
will send an 802.2 test frame to a specified MAC and check for a
response:

# tcpdump -i lan0 -v -x ether src 0:15:60:ae:a9:fb or ether dst 0:15:60:ae:a9:fb
tcpdump: listening on lan0

11:28:42.718957 0:10:83:cf:55:2 sap 80 > 0:15:60:ae:a9:fb null test/P len=1497

0080 f300 0102 0304 0506 0708 090a 0b0c
0d0e 0f10 1112 1314 1516 1718 191a 1b1c
1d1e 1f20 2122 2324 2526 2728 292a 2b2c
2d2e 2f30 3132

11:28:42.720777 0:15:60:ae:a9:fb null > 0:10:83:cf:55:2 sap 80 test/R len=1497

8001 e300 0102 0304 0506 0708 090a 0b0c
0d0e 0f10 1112 1314 1516 1718 191a 1b1c
1d1e 1f20 2122 2324 2526 2728 292a 2b2c
2d2e 2f30 3132

There is a linux port of linkloop at http://www.freshmeat.net/linkloop

What I'm wondering is how many other platforms/switches/whatnot would
respond to the test frames produced by linkloop or something like it.

rick jones
--
denial, anger, bargaining, depression, acceptance, rebirth...
where do you want to be today?
these opinions are mine, all mine; HP might not want them anyway... :)
feel free to post, OR email to rick.jones2 in hp.com but NOT BOTH...

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Ethernet LAN switches or other devices which respond to Test frames?