Here's our network configuration, we use 2 1720's, we got 3 bldngs 2 of them are connected directly througn fiber, the 3rd through a leased line from PacBell, we divided the network into 2 subnets (in order to connect the 3rd bldng), the issue we're getting usually happens in the middle of the weekdays(after 12p - 3pm), in the 3rd bldng whenever users use our dbase, it slows down bigtime, is this normal, all I tell our users when they complain is because we're going through PacBell's leased line and it's looping far away just to get back across the street on our dbase server, and dbase's use a lot of bandwidth or is there something in our router we need to change or fine tune, any ideas or pointer would be great, thanks in advance.
I am a little unclear about your message but the first thing I would do is find out exactly what is happening on your network. Find out what your traffic patterns are and then what is causing them. To help in this you can look into MRTG (http://people.ee.ethz.ch/~oetiker/webtools/mrtg/). That will show you graphically the traffic coming into an interface and out of an interface. It can show the cpu, memory, errors etc of your network devices. If there is a MIB that your device supports, MRTG can grab it. That will let you know if the slow down is traffic related. Doesn't take long to install and configure either. You can also look into Qcheck to measure your actual throughput on your links. Both great toold and both free.
If you find it's traffic related and you want other user traffic to have priority over the dbase traffic, you can look into traffic shaping to give one type of traffic priority over another.
But first you have to find out what's going on. Tools you can use are MRTG, sniffers, Qcheck, syslog and if you have to access-lists with the log keyword or ip accounting (careful with this one due to the increased CPU load on the router) to find out the mem/cpu/errors/traffic/etc of your network devices.
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