What kind of mail server? I would tend to look there first. For example MS
Exchange Server can use policies to limit outgoing attachment size.
If the mail server checks out OK, I would take a look at traces of what
happens when the session times out and see if there is a 'smoking gun', and
if the session is even hitting the wire.
I would check to see if there is a problem sending ftp files over 1 mb to
eliminate the network devices, but experience points at the application, not
the router.
HTH,
Casey
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>Subject: SMTP troubleshooting
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>Hey all,
>
>Am studying CIT related material and am wondering what one would look for
>when troubleshooting SMTP data transfer over an FR circuit, say at 128K
>CIR, 256 port speed.
>
>Situation:
>
>Corporate site has 3600 class router with a serial interface configured
>with T1 port speed and only 256K CIR. One remote site of 11 has 2500 class
>router configured with 256K port speed/128K CIR. SMTP servers exist at
>both sites. SMTP server at remote does not receive Internet e-mail, it
>relies on corporate site SMTP server to supply Internet and corporate wide
>mail.
>
>Problem:
>
>Clients at remote site cannot send mail with attachments larger than 1 MB
>without 'timing out'. They can, however, receive mail with large
>attachments from the Internet and corporate. Remote FR circuit tests clean
>with no FECN or BECNs to report.
>
>Any suggestions on approaches to this problem? Need more info?
>
>
>
>
>
>Thank you,
>Raul De La Garza III
>CCNA NNCSS MCSE CNE
>Senior Network Engineer
>EmCare Incorporated
>
>
> Brave men are all vertebrates: they have their softness on the surface
>and
>their toughness in the middle. ?G.K. Chesterton
>
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