Slow down in a home network

SeeDk
SeeDk used Ask the Experts™
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This has been happening for roughly 10-15 minutes every few days. No real set time that it occurs.
The internet from the ISP is 300Mbps but during those 15 minutes it will throttle down to ~50Mbps.
This happens for computers both physically connected and wifi devices.
My first thought was maybe the DHCP pool ran out of IPs but I'm seeing there are ~50 spare IPs at any given time. Don't see anything wrong in the DHCP logs.
Now I have started running Wireshark on the DHCP server hoping to find anything that looks out of the ordinary but the issue has not reoccurred after I started logging. What should I look out for?
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Edward PamiasTeam Lead RRS Desk
Top Expert 2016
Commented:
Have you run a speedtest from speedtest.net? Also have you spoken to your Internet Provider to have them run some tests on their end?
Top Expert 2015
Commented:
"The internet from the ISP is 300Mbps but during those 15 minutes it will throttle down to ~50Mbps.
This happens for computers both physically connected and wifi devices.
My first thought was maybe the DHCP pool ran out of IPs but I'm seeing there are ~50 spare IPs at any given time. Don't see anything wrong in the DHCP logs."

Network speed is not related to DHCP.  Can you clarify if the problem is with external link (WAN) speed or internal link (WiFi, LAN) speed?  If it's WAN then you should call  your ISP as Edward suggested.
JohnBusiness Consultant (Owner)
Most Valuable Expert 2012
Expert of the Year 2018
Commented:
It could be load sharing outside your home causing this.

Also make sure your router has adequate overall throughput (900 Mbits/Second or greater). The one you have may be bursting if it cannot keep up overall.
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Author

Commented:
I mentioned DHCP because when connecting a mobile to wifi - the wifi connection window would spin for a long time without connecting. I've seen that before when IPs have run out on the server.
Yes, the speedtest right now is fine; it is only during these short windows that there is a slow down.
Haven't checked with the ISP yet to confirm if they have seen any problems.
Top Expert 2015
Commented:
When I had issues with internet speed I had my ISP put on a monitor to monitor the connection for a couple of weeks.  This is for a business line not home.  Your first stop should be the ISP and you should be testing network speed from the trunk.  This way you know if the speed issue is internal or external.  If you are testing from within internal network then the speed issue may be a combination of both (WAN and LAN/WiFI).  If you're testing directly from the trunk then it's just the WAN.
Distinguished Expert 2018
Commented:
Start with your ISP. Try to call them roughly around the time the problem occurs if that is consistent. Also try withoutnyoue router if that is an option. (Without knowing who the ISP is...)

They should ideally have an idea of what is going on, be it signaling or some other issue. I have seen random issues from at a church from a  major cable company because they would do line maintenance on Sunday mornings, which of course is when a church needs their service most.

Author

Commented:
ISP is Verizon I will call them and ask if they can monitor for a few weeks. Not seeing anything internal causing the issue and it hasn't occurred again after I started logging with Wireshark
Edward PamiasTeam Lead RRS Desk
Top Expert 2016

Commented:
Are you using their router? They told me I had to or they would not guarantee the speeds. I have their gigabyte service.

Author

Commented:
Their router is being used for the internet. An ASA is plugged into the router and then two switches are plugged into the ASA. The speed is consistently 300Mbps except for these random occurrences.
JohnBusiness Consultant (Owner)
Most Valuable Expert 2012
Expert of the Year 2018

Commented:
If the speed is normally consistent except for random and spaced occurrences, there is probably nothing to worry about.
Distinguished Expert 2018
Commented:
I wouldn't look at it as significant granted that companies always say "up to". However, it is worth making Verizon look into it. I would normally suggest removing the Verizon router from the equation, but I am betting that you have their TV service (the interactive guide has some requirements that piggyback off the internet connection) and that you don't have an Ethernet cable going to the ONT. Especially since your issue is so random, it's hard to predict when exactly it would occur.
Shaun VermaakTechnical Specialist
Awarded 2017
Distinguished Expert 2018
Commented:
Use something like http://testmy.net/auto and test your connection over time. Check if you can see a pattern
JohnBusiness Consultant (Owner)
Most Valuable Expert 2012
Expert of the Year 2018

Commented:
Range of solutions provided.

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