I'm having exactly the problem described here: https://blog.dan.drown.org/sb6183-dropping-ipv6-traffic/ and https://www.dslreports.com/forum/r29569626-IPv6-SB6183-IPv6-problems
When I bought the modem it had known-working firmware on it; but it was downgraded when I connected to Mediacom.
I realize this modem model is getting older; is there any hope at this point Mediacom will get the newer firmware pushed out? (Or at least stop downgrading the SB6183 for others in the future..)
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