Loss of bandwidth ... What should I check please?

Question

Good day,&nbsp;I just upgraded my internet service to Xfinity Blast! Pro... 250/10 Mpbs.Seems if I put a device through my SRX5308, I can not break 100Mbps.- I have upgraded the firmware to version: 4.3.5.3- I have disbled all firwall rules, rebooted, and tested via&nbsp;www.speedtest.net and&nbsp;www.backblaze.com/speedtest/- If I connect my PC directly to the Cable modem, I clearly get around 230/10 Mbps- Link lights are green, showing 1000Mpbs connectivity.&nbsp;Thank you in advance for providing any assistance you can.&nbsp;w/r,Mike&nbsp;

Euther · Answer

Opps. Can't find the delete button

DaneA · Answer

Hi Euther,

&nbsp;

Welcome to the community! :)&nbsp;

&nbsp;

Let us isolate the problem.&nbsp; Kindly answer the questions below:

&nbsp;

a. Is the SRX5308 connected to a modem-only device or to a modem-router provided by&nbsp;Xfinity Blast?&nbsp; If ever the device provided by&nbsp;Xfinity Blast is a modem-router combination, I suggest you to set the modem-router to full-bridge mode so that it will be a modem-only device.&nbsp; This will make the SRX5308 the main router of your network wherein the Public WAN IP Address will be registered to it.

&nbsp;

b. Since you have upgraded the firmware of the SRX5308 to v4.3.5.3, did you perform a factory reset after upgrading the firmware?&nbsp; If not yet, I suggest you to factory reset the SRX5308 then reconfigure the settings from scratch and observe if same problem occurs.&nbsp;

&nbsp;

Regards,

&nbsp;

DaneA

NETGEAR Community Team

Euther · Answer

DaneA,Thank you for replying. I do appreciate it! Thank you for the warm welcome, too!&nbsp;[Q] Is the SRX5308 connected to a modem-only device or to a modem-router provided by&nbsp;Xfinity Blast?[A]&nbsp;The SRX5308 is connected directly to a ARRIS SURFboard SVG2482AC Eth Port 1.&nbsp;&nbsp;[Q]&nbsp;I suggest you to set the modem-router to full-bridge mode so that it will be a modem-only device[A] I see on the "At a glance" web page that Bridge Mode = Disabled. Is this what you are referring to? &nbsp;When I click the enable button, this pops up:&nbsp; "Enabling Bridge Mode will disable Router functionality of gateway and turn off the private Wi-Fi network. Are you sure you want to continue?" I have the wireless disabled at this time, so I dont know if this is a big deal or not. Also, I have phone service connected to this device. Will this be impacted if I enable this option? Thoughts?&nbsp;&nbsp;[Q]&nbsp;Since you have upgraded the firmware of the SRX5308 to v4.3.5.3, did you perform a factory reset after upgrading the firmware?&nbsp;[A] I did not. Is there a preferred link I should look at for instructions on how to do this?I am assuming the following:Backup / Restore Settings1) Save a copy of current settings2)&nbsp;Revert to factory default settings.&nbsp;Click the "Button". I will need to find out the default name/password.&nbsp;3)&nbsp;Restore saved settings from fileYes? I have some LAN/WAN Rules too... anything special I need to do regarding those?&nbsp;Thank you again!!&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

Euther · Answer

Perform a factory reset after upgrading the firmware?&nbsp;Via, Backup / Restore Settings1)&nbsp;Save a copy of current settings2)&nbsp;Revert to factory default settings.&nbsp;Click the "Button". I will need to find out the default name/password.&nbsp;3)&nbsp;Restore saved settings from file4) Rebooted.5) Disabled all FW rules6) Speed Test Results (Same Server):&nbsp; 60Mbps (D) / 11Mbps (U)&nbsp;

DaneA · Answer

Euther,&nbsp;
[Q] Is the SRX5308 connected to a modem-only device or to a modem-router provided by&nbsp;Xfinity Blast?[A]&nbsp;The SRX5308 is connected directly to a ARRIS SURFboard SVG2482AC Eth Port 1.&nbsp;

As I have checked about the&nbsp;ARRIS SURFboard SVG2482AC here, it is a combination of cable modem and router.&nbsp; Since the&nbsp;SRX5308 is connected directly to&nbsp;ethernet port 1 of the ARRIS SURFboard SVG2482AC, you have a&nbsp; Double NAT scenario wherein a router (the SRX5308) is connected behind another router (which is the&nbsp;ARRIS SURFboard SVG2482AC).&nbsp;&nbsp;
&nbsp;
To learn more about Double NAT, kindly access the article below:
&nbsp;
What is Double NAT?
&nbsp;
&nbsp;

[Q]&nbsp;I suggest you to set the modem-router to full-bridge mode so that it will be a modem-only device
[A] I see on the "At a glance" web page that Bridge Mode = Disabled. Is this what you are referring to?
&nbsp;When I click the enable button, this pops up:&nbsp; "Enabling Bridge Mode will disable Router functionality of gateway and turn off the private Wi-Fi network. Are you sure you want to continue?" I have the wireless disabled at this time, so I dont know if this is a big deal or not. Also, I have phone service connected to this device. Will this be impacted if I enable this option? Thoughts?&nbsp;

Yes, the Bridge Mode is what I am referring to.&nbsp;&nbsp;
&nbsp;
I found this forum link online here, it says on a paragraph&nbsp;there (by EG) that the&nbsp;ARRIS SURFboard SVG2482AC&nbsp;can be put in to bridge mode so that it acts only as a cable modem with phone support.&nbsp;
&nbsp;
As I have mentioned from my initial response to you, setting the&nbsp;ARRIS SURFboard SVG2482AC to bridge mode&nbsp;will make the SRX5308 the main router of your network wherein the Public WAN IP Address will be registered to it.&nbsp; Kindly read&nbsp;Option 2 on the article below:
&nbsp;
How to fix issues with Double NAT
&nbsp;
I suggest you to to set&nbsp;the&nbsp;ARRIS SURFboard SVG2482AC to bridge mode then check what download/upload speed you will get through the SRX5308.&nbsp; &nbsp;
&nbsp;
&nbsp;
Regards,
&nbsp;
DaneA
NETGEAR Community Team

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Loss of bandwidth ... What should I check please?

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