A few things to keep in mind:
- how is speed being determined?
- is everything else (ie network behind
the NAS and RAS, the remote users,
the servers terminating the data connections
that are used to measure throughput)
constant?
Any NAS connection has different layers
to take into consideration when comparing
throughput. Since these are sync ISDN
connections and not async modem
connections, you have one less variable.
- layer 1 - slips, errors, drops, etc.
"sh int" and "sh control e1" would
indicate if there are any issues here.
- layer 2 - PPP - if you are using Multilink,
then "show ppp mult" would confirm
if there are any lost or re-ordered
fragments. If not using MPPP, then there
should not be any issues.
- layer 3 - IP. This could be switching
problems, where we aren't switching as
fast as we could/should be. Check
"sh int stat" and "sh int switch" to
confirm that everything is at least
being fast switched.
- Other. Check the CPU on the boxes,
to make sure it is not high. Check
for alignment errors. Make sure you
are running fairly new code on the boxes.
