No resolution to the issue, but we've found some work-arounds, and here are some answers to suggestions i've received (thanks for all the suggestions!), plus some more info: - Neither ipmp nor ipf are enabled on the machines with issues. No other firewall is present. - I get timeouts even when the two machines are in the same subnet. - I've re-verified that when both the switch and the server are set to auto-negotiate, they are appropriately configured the same. Problems still persist. - We've tried hard-setting the switch and a server to 1000/full duplex and 100/full duplex and still have problems. - `netstat -i` reports no errors or collisions. - I am using `ping` for most of my testing, but ssh sessions also time out and http connections hang. - If i ping the 10u4 server while simultaneously pinging anything else *from* the 10u4 server, then my ping rates drop to 1% packet loss. - only changes i've read about to networking are the DAD changes, and unfortunately the designers decided not to allow us to turn off DAD. - placing the server behind our pix firewall, running in transparent mode, problem persists. - placing the server behind our pix firewall, running in nat mode, problem disappears. The production machines in question were eventually going behind the pix, so for now we have a workaround - keep them behind the pix and away from whatever is downing u4/5 on our network. Once we get more time we'll try to troubleshoot the issue further to look for a real solution - for now project time limits require the workaround to be enough. It really feels like a mac cache issue but it's strange that it only affects u4/5 and that u3 in the same physical/logical setup is fine. Thanks for all your help & suggestions, -f http://www.blackant.net/ _______________________________________________ sunmanagers mailing list sunmanagers@sunmanagers.org http://www.sunmanagers.org/mailman/listinfo/sunmanagersReceived on Thu May 1 12:33:03 2008
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