Hello, I have a customer who is experiencing network slowness and intermittant loss of connectivity across the entire network.
The network is 24 bit with 4 Dell 2724 switches daisy chained together.
I wasn't sure if it was possible to mirror a port on these switches so I put a hub inline with their domain controll/file server and ran wireshark.
I didn't see anything along the lines of a broadcast storm or any strange traffic on that port.
90% of the time all pings to devices on the network respond fine, the other times, I can ping some devices and some I cannot. The outages last from just a few seconds to indefinately.
This behavior occurs on multiple ports on "all" of the 4 switches.
I noticed some really odd behavior when I tried running a ping sweep on the network. I had 5 continuous pings running to a handful of hosts on the network, some would reply, some wouldnt. It was random. Now, the strange part,..... "everything" started to reply to pings immediately after I ran the ping sweep (using angry IP) across the entire subnet.
I few moments later, random pings started to not respond again... I ran another ping sweep and everythign immediately began reaplying for a few minutes.
I tried running the pings and ping sweeps from multiple computers on the network and the same exact behaior happeded every time... Pings would drop to random devices until I ran the ping sweep... then all was well for a few minutes.
Any idea as to what could be going on here?