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Extremely inconsistent internet speeds and latency

Jodi123
I Plan to Stick Around

For the past week my internet has been having extremely inconsistent latency, it will spike for 10 mins, clear up for 1 min then spike again.

 

Im not sure what is going on or why it is doing this.

 

Anyone have/know anything that i can try to solve this issue?

 

Im using a Cisco DPC3825

 

 

***edited labels***

68 REPLIES 68

Re: Extremely inconsistent internet speeds and latency

slcfam
I Plan to Stick Around

Thanks for the reply @Datalink.

 

Modem has firmware .27.

 

I factory reset and ran a single machine directly to the modem over ethernet (port 1).  Packet loss still occurred and in fact seemed to be more frequent although not every event was enough to kill tcp connections.  Inconclusive results, however, as I wasn't able to run this configuration very long.  I plan to do more testing when it doesn't impact the family too much.  (Troubleshooting a problem that only happens once an hour is tedious!)

Re: Extremely inconsistent internet speeds and latency

slcfam
I Plan to Stick Around

Ok.  Looks like I've figured it out this time.  The DHCP server is issuing a lease time of only 54 minutes for some reason.  How nobody at Rogers made this connection I'm not sure.  But I've watched the renewal happen multiple times now and each time it breaks TCP streams most of the time and VPN connections every time it happens.

 

Used to be 7 day leases, IIRC.

 

Re: Extremely inconsistent internet speeds and latency

@slcfam what is the DHCP Lease time set for in the BASIC ...LAN SETUP tab?  Looking at V2.0.10.29 the choices are:  30 Min, 1 Hr, 2 Hrs, 6 Hrs, 1 Day, 2 Days, 1 Week, 2 Weeks, Forever.

 

2b_BASIC - Lan Setup - DHCP Lease time.jpg



Re: Extremely inconsistent internet speeds and latency

slcfam
I Plan to Stick Around

I had put the modem back in bridged mode this morning; maybe I will factory reset, again 🙂 and take a look.  But that will have to be this afternoon.  (Currently doing this from remote/VPN and VNC'ing.)

 

*Edit:  Although I didn't think any of the webgui settings would have any effect on a bridged modem?

*Edit2:  Your attached image didn't show up when I replied originally.  This is not a LAN dhcp issue, it's from Rogers itself to me.

Re: Extremely inconsistent internet speeds and latency

slcfam
I Plan to Stick Around

Got a hold of a repair tech who, strictly off the record, stated that Rogers will shorten the DHCP renewal times when maintenance is in the area or provisioning new IP blocks or re-segmenting the network.  Why this was told to me off the record, how true it is, I don't know, but nobody at Rogers has been able to make the connection between the DHCP leases and connectivity blips.  "Everything's fine on our end."

 

Now, do I wait until they sort out whatever-it-is-they're-doing or do I bang on tech support until someone listens?

Re: Extremely inconsistent internet speeds and latency

slcfam
I Plan to Stick Around

Final message from tech support was to see if the Network Architect or Project Manager for Gaming could answer how long the DHCP lease will be set to such a short renewal time.   I'm done bothering you fine RE's, appreciate the attention.

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