> This sounds exactly as you describe... collisions! They are due to a > number of reasons; but some things to check: > > 1. Bypass the hub with a direct (rolled) cable. If this works (check > collisions in ifconfig), then replace your hub with a switch which doesn't > suffer from the following... Note: some "hubs" are really switches... A > real hub is a cheap buffered repeater -- the buffer is rather small (acts > like an "elastic buffer"); it "snaps" when a sending NIC's crystal is out > of specs -- the snap results in the hub sending a "jam" (collision) back > to the sending NIC. Bypassing the hub eliminates the hub's elastic > buffer. I'm surprised you're able to send that much data if this is the > problem though...
Well the hub I use a LinkSys NH-105 connects all the machines on the network, our DSL router, my Linux box, our File server, and my wife's laptop. I have not recently checked my wife's laptop, but the only time that I see these collisions is between my box and the file server. And yes, I did get 650Mb to pass after rebooting the server. > 2. Near end collisions: are your cables direct, or running through > hookups around the house? Poor connections and not enough twists in the > pairs or poor cable at the sending end can result in near-end collisions > due to crosstalk from sending signal back into sender's receiver circuitry > -- hearing itself. We just moved, and right now all connections with the hub to machines are less than 10 feet. So I don't think there is a problem there, but maybe the hub to FS cable is bad, it has gotten a bit of strain, as I forget it is only 3 feet long. > 3. If your NIC is an Intel eepro10, consider trying something else... I > had this very problem when transferring large files... interestingly, the > apparently random failures were at exactly the same point on any specific > file. No I run a mixture of 3Com 3C509 and D-Link RTL 8139 using the 8139too driver. > 4. If you're using coax, you may have termination problems (no need to > discuss now unless you have coax). Nope, CAT-5e. I will check the cables and the hub as you say, and replace as needed, upgrading the hub if needed. Rob -- Linux: For the people, by the people.
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