Re: (ASCEND) mail attachment problem

[Bob K <melange@yip.org>]

On Tue, 11 May 1999, Peter Lalor wrote:

> >From: "Jerry O'Brien" <jobrien@cuttingedge.net>
> >
> >I have a group of users who can't send email attachments through one of my
> >Max 4048s. Another identical box at a different site works fine, so I'm
> >ruling out customer equipment and DNS. Anyone know of anything in the 4K
> >configuration that could cause this? It happens to files as small as 40K, so
> >I don't think it's a size problem. My mail log (Linux, sendmail 8.?) says
> >the server is waiting to receive mail data, but then times out after two
> >hours. I think the clients are giving up and closing sooner, but the mail
> >server always waits for the timeout.
> 
> I saw this once and it was errors on a T1 caused by frame slips. The
> symptoms were that surfing worked fine, but mail attachments and FTp had
> problems.
> 
> Check these things:
> 
> 1. Errors on the line(s).
> 2. Difference in LQM settings on each Max
> 3. Dump out the configs and run a compare on them

Packet loss above 3% somewhere along the line is almost always the cause
of this (which can be caused by the above list); I find a good test is to
do a traceroute to your mail server and do ping -q -c 100 aaa.bbb.ccc.ddd
on each hop starting with the first to see where it is (since it may be
further than just the next hop).

ie: (This isn't from a MAX, but the commands work the same)

11:34:51pm|melange@pi:/home/melange> traceroute -n 198.133.36.9
traceroute to 198.133.36.9 (198.133.36.9), 30 hops max, 40 byte packets
 1  142.154.7.241  1.186 ms  1.010 ms  0.988 ms
 2  142.154.79.148  9.809 ms  8.953 ms  9.050 ms
 3  142.154.79.145  8.867 ms  8.802 ms  9.028 ms
 4  142.154.71.249  9.666 ms  8.654 ms  114.202 ms
 5  204.92.54.110  8.985 ms  8.825 ms  8.911 ms
11:34:57pm|melange@pi:/home/melange> ping -q -c 100 142.154.7.241
PING 142.154.7.241 (142.154.7.241): 56 data bytes

--- 142.154.7.241 ping statistics ---
100 packets transmitted, 100 packets received, 0% packet loss
round-trip min/avg/max/stddev = 0.850/0.982/5.642/0.502 ms
11:36:48pm|melange@pi:/home/melange> ping -q -c 100 142.154.79.148
PING 142.154.79.148 (142.154.79.148): 56 data bytes

--- 142.154.79.148 ping statistics ---
100 packets transmitted, 100 packets received, 0% packet loss
round-trip min/avg/max/stddev = 7.139/10.677/35.569/3.899 ms
11:39:25pm|melange@pi:/home/melange> 

et cetera...

melange@yip.org - Mustard gas: The kids love it!

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