Re: stuck in nfsfsync
On Tuesday 25 January 2005 00:32, Matthew Dillon wrote:
[...]
> Well, it looks like the last fragment the client sends is getting
> garbled somewhere. The tcpdump on the client seems to believe that
> the packet is valid.... the last fragment looks just fine. But the
> tcpdump on the server appears to see a corrupted packet or packet
> header. It understands the fragment id, size, and offset, but it
> is totally confused about the IP address.
>
> The question is, where is the packet getting garbled? The client
> thinks it sent out a valid packet and the server thinks it received
> a garbled one.
>
> How is your network setup ?
Just a home network:
(internet) ---- [ADSL router] ---- rl1 [OpenBSD] rl0 --- re0 [DragonFly]
> What is the path going between these two machines?
Direct link over a crossover cable.
> The first thing I would do is connect the client's ethernet
> through a HUB and monitor the packket traffic with another machine
> connected to the same HUB, so we can be sure that the client is
> actually sending out a valid packet fragment. If it is, then move the
> HUB to the server and look at the packets going into the server. If
> they look good, then it is the server itself that is garbling the
> packet.
That's not very easy for me to test. I could bring in a third machine when I
have some free time (after Thursday) but I don't have a hub and I'm not sure
they still sell them where I live. We'll see.
> It is also quite possible that the fault is the client. A 4-byte UDP
> packet comes in under the 64 byte ethernet frame minimum, it could be
> a bug in the RE driver when dealing with tiny packets. Further tests
> are needed.
That's easier. I'll put rl1 on the dragonfly box and retest (tomorrow).
Thanks,
Aggelos
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