14 Feb
2009
14 Feb
'09
12:55 p.m.
I'm looking at TSO too as above, mentioned by Nickola. I'll maybe risk changing it with ethtool during a quiet network moment.
Turning off offloading might be something to try indeed. Regarding the negotation issue, can you look at the other end of the link and check what it's saying? Looking at "netstat -s" statistics at the endpoint (not the router) could be illuminating, too. I haven't got any expertise in this area, but TCP problems can often be diagnosed by looking at tcpdump/packet captures and analyzing them using tcptrace (and the special xplot variant which can plot tcptrace output).