RE: [Ethereal-users] email attachment times out

["Andersen Jens Elmo" <jens.elmo.andersen@xxxxxxxxxxx>]

Hi,

It looks like a duplex mismatch.
You have CRC errors and Runts (Runt =  frames that are less than the
minimum 64 bytes.)

This happens when you have a full duplex node sending to a half duplex
node.

The full duplex node will send data at the same time it receives data.
(This is full duplex.)
However, when starting to send, it will interupt the other end that will
not accept receiving data while sending.
(This is Half duplex)
The half duplex node will stop sending imediately when it starts
receiving and that will generate a runt and a CRC error.
This is what you see in the trace.

You should verify the duplex setting allong the communication path.
Usually you have one node set to auto negotiation and another to fixed
full duplex.

Another posibility is that you run an old network with hub's or even
some yellow cable ethernet.
In such a pure half duplex network, you can have lots of CRC errors and
runts if you have too many collisions.
Still, I would not expect you to see retransmissions unless you really
overload the network with collisions.

Regards

jens Elmo
 
-----Original Message-----
From: ethereal-users-bounces@xxxxxxxxxxxx
[mailto:ethereal-users-bounces@xxxxxxxxxxxx] On Behalf Of Jon Miller
Sent: 11. november 2005 11:04
To: ethereal-users@xxxxxxxxxxxx
Subject: [Ethereal-users] email attachment times out

Lately, I've been having an issue where my e-mail is timing out when I
send an attachment.  Whereas if I send just an e-mail I do not have any
issues.
I ran ethereal v0.10.13 to capture some packets and notice a great deal
of retransmissions and checksum errors.  I've run previous versions of
ethereal and never had any of these.  I read in the FAQ regarding
checksum issues and I'm not sure this is generated because the packets
are just handed over.  I've exported the packet capture in a plain text
file at http://www.mmtnetworks.com.au/email-attachmt.txt.
Would appreciate any help on what the cause may be.

This workstation (Zen1) 192.168.1.143 connects to a 48-port Cisco switch
2950.

Thanks

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