We're on a small business DSL line. Our connection is quite fast, and we can easily get about 200-300 KB/s throughput, depending on the site.
We've noticed, however, that our connection has slowed down all of the sudden, and we sometimes now get time-outs to one of our off-site FTP sites.
We've called our ISP, and they don't see any problems on their side.
We have about 15 people in our office. We've noticed that when the office is fully staffed, we get ping times of 400ms to sites like yahoo.com. When the office only has a few people in it, we get ping times of 75ms or less. There is no major traffic that we can identify (e.g. mass downloads).
Obviously volume of users has something to do with it, but I doubt it would be that severe. Is NIC chatter a possibility? If so, how can we check (I don't have the budget for a permiscuous card).
We almost always have DHCP issues too. That is, in the morning, I have to release and renew in order to get an IP address. This happened with two separate DHCP servers.
Here is our set up:
Cisco 800 router (from ISP) into a Sonicwall SOHO/3 firewall (70Mb firewall throughput). SOHO/3 firewall into a d-link switch. One additional switch in the main d-link switch (5 PCs), and about 10 PCs into the switch directly. We have 3 fixed network devices: 2 x servers, and 1 printer. We are running DHCP, from the firewall.
We have reset the firewall already, but that didn't solve it.