Comcast XFINITY → Re: [Connectivity] help me please

they're all connected directly into the modem. all wired connections. yes, it's ethernet.

Sounds like your modem is bad then.

and what can i do about that? comcast has the worst costumer service ever. at least in baltimore. will i have to pay for a new one or..?

If the modem isn't yours, then you should not have to pay to replace it if it is indeed bad. If it turns out to be something in your network and not Comcast's modem or external wiring, they could charge you for the truck roll.

If 10.0.0.1 is the internal (LAN) IP address of your modem, from one of your PCs (assuming it's windows), open a command prompt and run:

ping -n 300 10.0.0.1

Then post the summary output here in this thread, this part of the output:

Ping statistics for 10.0.0.1:
    Packets: Sent = 3, Received = 3, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 0ms, Maximum = 2ms, Average = 1ms

You should not see packet loss over ethernet to a device with nothing in between.

So looking at your screenshots, you have three computers connected via wired ethernet? I see one connected at 10Mbps Full Duplex (FD), one connected at 100 Mbps FD and the last at 1 Gbps FD. Is that correct?

Can you cause the packet loss on the Arris by doing the speed tests? Although, I must say that I missed the fact that even when there is packet loss at the Arris, it does not continue down stream to the following roter hops. So the Arris might just be set to have pings at a very low priority.

and sorry, ropeguru, but i have no idea what that means, but yes, there's 3 computers connected.

ping statistics for 10.0.0.1:
packets: sent = 300, received = 300, lost = 0 (0% loss),
approximate round trip times in milli-seconds:
minimum= 0ms, maximum = 17ms, average = 0ms

so im guessing the best thing to do is contact comcast and ask for a new modem?

If all 3 pcs have bad speed test results then it is either the modem or a connectivity issue. I would call Comcast and have them run a test on the modem. If you rent the modem then it should not be an issue to get a replacement.

alright. appreciate the help from everyone