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djc6's avatar
djc6
New Contributor
7 years ago

IPv4 issues after SB8200 upgrade - IPv6 works fine

A month ago I upgraded to an ARRIS SB8200 modem from Netgear CM600.

Every week or so I have an issue where IPv6 works fine but I cannot reach any websites via IPv4.  I can ping sites on the internet with AAAA records fine, but can't ping sites with only A records.  I cannot ping my v4 default gateway from Cox from the router (it has some debug tools like ping, nslookup, etc) or from my computers.  But big websites like Yahoo, Google, etc.. work fine because they are accessible via IPv6!

Restarting router doesn't help; only restarting the modem does. 

I did a search online and found similar complaints in the Comcast Xfinity forums from users with the SB8200 modem and the Motorola MB8600 modem - both use same BCM3390 chipset.

Any Cox users with a Broadcom BCM3390 chipset modem like Netgear CM1000, Motorola (Zoom) MB8600 or Arris CM8200/SB8200 experiencing this issue?

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  • Allan's avatar
    Allan
    Moderator
    7 years ago

    Hello,

    We can look into this issue further for you. Please send us an email with your full address to cox.help@cox.com so we can help. 

    Thanks,

    Allan - Cox Support Forums Moderator.