Intermittent internet & slow ping

September 24, 2010 at 11:18:42
Specs: Macintosh
Hello,
I am just starting to work on a schools network that has been quite "messed up" over a period of time. We're working on redoing a lot of the infrastructure.
My questions is I have a few locations within the network that are experiencing slow (or no) internet. Network addressing is right and and I can ping the gateway with reasonable results (1.5ms - 2.5ms). When I get into a browser smaller sites (google.com) load fine while larger sites (apple.com,msn.com,cnn.com, etc) load very slowly or time out completely. This can also be intermittent. I've tried changing the DNS manually to google's open DNS. We do not (at this time) have a local DNS server and are relying on our ISP's DNS.
Any ideas what could be causing this? Or where to start looking? The locations are linked with fiber and plugging directly into the switch gives flawless results yet the single location coming off the switch has problems. Could it be a cabling issue?

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#1
September 24, 2010 at 13:11:05
Any ideas what could be causing this? Or where to start looking? The locations are linked with fiber and plugging directly into the switch gives flawless results yet the single location coming off the switch has problems. Could it be a cabling issue?

Is this single problem connection fibre also or copper? What does it connect to? What do the fibre connections connect to?

A description of your physical network and appliances in it (make/model) will be very helpful

It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.

***William Henley***


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#2
September 25, 2010 at 08:38:16
The backbones are fibre which connect Cisco Catalyst 2950 switches (10/100). From the switch its Cat 5e cabling. Their are several connections off the switches but only on a few of those have problems connecting back.
Would 10/100 switches (even though they are Cisco) be sufficient vs. gigabit 10/100/1000?
I believe I located at least part of the problem. Their is a single fibre line coming from the gateway which connects to a 2950 switch, the fibre lines connecting two more buildings are coming from a second 2950 switch. Their is a single Cat5 crossover cable linking the two switches. Essentially all traffic from two buildings is connecting back to the gateway over a single Cat5 cable (does not show 5e rating). I'm thinking this could be causing the problems.

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