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Actually it doesn't quite work like that as in a traceroute you always see the return i/f, so on a traceroute from A to B to C you see routerb-x-y-z-routera.blah.net routerc-x-y-z-routerb.blah.net It's mainly useful because you immediately know that a link is OK, if you just se serial0 or whatever with equipment that sometimes skips hop reports and sometimes double reports, sometimes is in mid flap, it saves working out whether that was the "right" serial i/f. Alex Bligh Xara Networks - - - - - - - - - - - - - - - - -
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