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“unknown devices” connecting via ethernet to XB8 gateway SOLVED - caused by “known ethernet devices” generating additional MAC addresses
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Port forwarding for wired ethernet device
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3231
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Gigabit speed troubleshooting video
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Internet Troubleshooting Tips
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(11959)

As of Dec 2025, how to set DHCP reservation in Xfinity app?
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Static PublicIP
3
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107
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Unreliable Wifi
2
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19
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Intermittent Internet Outages on 1.3 Gbps Cable Connection (4-9 PM PST Daily)
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7
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Intermittent Modem Connection - no power on 21 of 32 channels
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41
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2.4 network not showing up
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7
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Frequent intermittent loss of internet in our neighborhood
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5
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Ethernet Link Speed
4
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14
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Intermittent upstream noise: upstream transmit power pegging at 54.5 dBmV, OFDMA disabling, recurring drops
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14
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Getting a lot of t3 and t4 errors
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24
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I am not receiving my full plan bandwidth.
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11
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Data usage validation
1
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12
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Xb8 provision problems and support refused to escalate to level 2 without a second technician visit which is not available
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7
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XB10 Internet Speed Issues
3
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76
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mb6100- RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW errors
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