I recently upgraded to a 150Mbps connection with Comcast. After the upgrade, I see that my download speed is 50Mbps on ipv4, but 150Mbps on ipv6. Searching online, I see that some users advise turning off WMM. However, after making this change, the speed falls to 25Mbps on both ipv4 and ipv6. Can someone please advise how to fix this?

I accidentally uploaded the wrong second screenshot. Here is the right one...

Hi, your screenshots show pretty close speeds. Do you have another screenshot to show the difference?

Please look again, you'll see that the first screenshot shows the following ipv4: 52.32Mbpsipv6: 139.04Mbps These results have been very consistent across multiple speed test sites and over several days. Thanks.

for some reason those screenshots are showing. can you please post again? Can you please PM me your MAC address and the location as well and the speedtest server you are trying? also, what kind of laptop/NIC are you using? what FW are you running and I assuming ISP is comcast. this is kind of behaviour is very strange. can you please try other port on the device as well?

Sorry about the images, here it is: I've received these same results on my iPhone 6, a Late 2013 iMac running OS X Yosemite, that same iMac running Windows 7 through Boot Camp, and a Mid-2011 Macbook Air. Firmware version V2.02.06 with Comcast. This issue only happens on Wireless. Switching to a direct ethernet connection resolves the problem. PMing you the additional details now.

C3700 ipv4 speed 3x slower than ipv6 speed on comcast. Turning off WMM doesn't help.

11 Replies

gdeglin
Aspirant
Oct 18, 2015
I accidentally uploaded the wrong second screenshot. Here is the right one...
- vkdelta
  NETGEAR Employee Retired
  Oct 19, 2015
  Hi, your screenshots show pretty close speeds.
  
  Do you have another screenshot to show the difference?
  - gdeglin
    Aspirant
    Oct 19, 2015
    Please look again, you'll see that the first screenshot shows the following
    
    ipv4: 52.32Mbps
    ipv6: 139.04Mbps
    
    These results have been very consistent across multiple speed test sites and over several days.
    
    Thanks.

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C3700 ipv4 speed 3x slower than ipv6 speed on comcast. Turning off WMM doesn't help.