3Com OfficeConnect 3C892 User Manual page 99

Table 6 Symptoms, Causes, and Solutions
Symptom
Sending e-mail is occasionally
slow when more than one
workstation is sending e-mail
to the same SMTP server.
Compression does not work
Possible Cause
A limitation of NAT, the SMTP
server uses a different port
number than the one requested
by the workstations sending
e-mail so the LAN Modem does
not know which of the 2 (or
more) workstations to forward
the response to. Therefore, the
request is discarded.
After 30 seconds, the SMTP
server responds, this time using
the port number specified by the
workstation allowing the e-mail
to be sent.
Compression is not configured.
Compression negotiation was not
successful.
Evaluating Symptoms and Solutions
Solution
Co-ordinate the sending of your e-mail with the other
workstations, or have each workstation use a different
SMTP mail server.
Go to the appropriate Service Provides page and ensure
compression is enabled.
Although compression is enabled on the LAN Modem,
the device the LAN Modem is dialing into must also
have compression enabled and also support the same
type of compression (hi/fn LZS) otherwise compression
negotiation will not be successful.
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