The network interface goes dead after a while

I have a Ultra 1, with Solaris 2.5.1, The network interface goes away after a while and i go to the console and make a ping or a telnet anything that sends a packet to the outside world and everything restores to normal no fault can be noticed after a while about 15 minutes the net vanishes form the outside, but from the inside as i said before, here is nothing wrong, a packet goes out and the ouside sees me again, with the interface down i have made a trace route and it goes as far as the router to the correct segment and the host simply does not respond, i have tried to work around it with a cron tab entry that makes a ping every 10 minutes, but i am not very confortable with his method, i fist thouth some patches were minsing, so i aplied the network patches, and kernel patches, and the rest of the recomended patches ecept the one of sendmail because i heve the one of berkley,
some one, gave me some kernel configuration parameters to change, it seemed to work for a day or 2 but the problem came back again, so the failure is intermintent.

have any ideas how to test the hardware, of the native ethernet card le0, i would realy apreciate a solution to this problem, i had fixed the mac addres in the router and it dose not help much, it is realy anoyng.

i
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hrumayorAsked:
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prophet_Commented:
It sounds like your router is losing the MAC addr of your work
station. Have your network folks check to make sure the timeout
is setup correctly.
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hrumayorAuthor Commented:
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