IPv4 issues after SB8200 upgrade.

Question

After upgrading to SB8200, my router and modem have issues with IPv4 adresses.&nbsp; It begins after a period of time.&nbsp; Restarting the router fixes it for an indefinite period of time but eventually it loses the ability to resolve IPv4 addresses.&nbsp; I have tried two different routers with the SB8200, with both routers experiencing the loss of IPv4 and have not had a problem with the SB6140.&nbsp; This started after an upgrade to ultimate.&nbsp; Other forums have resolved this as a ?backend" network engineering issue but the fix is not automated.&nbsp; I have tried disabling IPv6 and that does not work.&nbsp; When IPv4 shutsdown, access to the modem address, 192.168.100.1, is affected and the modem cannot be accessed.&nbsp; This is not a new problem but appears unresolved in Cox as a search shows this comes up quite often.&nbsp; I will need to cancel the service and return the modem if this is not fixed.

timb · Answer

Here is a tracert to "gmail.com" when the modem is working and when it fails.&nbsp; The issue is outside the local lan but is at a crossover to IPv6 in Cox land and is part of the route table that the modem stores.&nbsp; Rebooting the modem "fixes" it until some IPv6/IPv4 route table update from an access corrupts the routing table and makes everything unreachable including the mode @ 192.168.100.1.&nbsp; Probably accessible to tech that can arp the modems route table.
Working, no isues...C:\Windows\system32&gt;tracert gmail.comTracing route to gmail.com [172.217.4.165]over a maximum of 30 hops:&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp; 1 ms&nbsp;&nbsp;&nbsp; &lt;1 ms&nbsp;&nbsp;&nbsp;&nbsp; 1 ms&nbsp; 192.168.1.1&nbsp; 2&nbsp;&nbsp;&nbsp;&nbsp; 7 ms&nbsp;&nbsp;&nbsp;&nbsp; 8 ms&nbsp;&nbsp;&nbsp;&nbsp; 8 ms&nbsp; 10.39.120.1&nbsp; 3&nbsp;&nbsp;&nbsp;&nbsp; 9 ms&nbsp;&nbsp;&nbsp;&nbsp; 8 ms&nbsp;&nbsp;&nbsp;&nbsp; 8 ms&nbsp; 100.127.73.172&nbsp; 4&nbsp;&nbsp;&nbsp;&nbsp; 8 ms&nbsp;&nbsp;&nbsp;&nbsp; 8 ms&nbsp;&nbsp;&nbsp;&nbsp; 8 ms&nbsp; 100.120.100.6&nbsp; 5&nbsp;&nbsp;&nbsp; 20 ms&nbsp;&nbsp;&nbsp; 20 ms&nbsp;&nbsp;&nbsp; 20 ms&nbsp; 68.1.4.252&nbsp; 6&nbsp;&nbsp;&nbsp; 20 ms&nbsp;&nbsp;&nbsp; 20 ms&nbsp;&nbsp;&nbsp; 21 ms&nbsp; 72.215.224.173&nbsp; 7&nbsp;&nbsp;&nbsp;&nbsp; *&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; *&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; *&nbsp;&nbsp;&nbsp;&nbsp; Request timed out.&nbsp; 8&nbsp;&nbsp;&nbsp; 23 ms&nbsp;&nbsp;&nbsp; 22 ms&nbsp;&nbsp;&nbsp; 21 ms&nbsp; 209.85.242.102&nbsp; 9&nbsp;&nbsp;&nbsp; 20 ms&nbsp;&nbsp;&nbsp; 20 ms&nbsp;&nbsp;&nbsp; 21 ms&nbsp; 108.170.234.215&nbsp;10&nbsp;&nbsp;&nbsp; 20 ms&nbsp;&nbsp;&nbsp; 21 ms&nbsp;&nbsp;&nbsp; 20 ms&nbsp; lax28s01-in-f5.1e100.net [172.217.4.165]Trace complete.Broken - (Modem IP 192.168.100.1 as well as all others are unreachable when in this state)C:\Windows\system32&gt;tracert gmail.comTracing route to gmail.com [216.58.219.5]over a maximum of 30 hops:&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp; 1 ms&nbsp;&nbsp;&nbsp;&nbsp; 2 ms&nbsp;&nbsp;&nbsp; &lt;1 ms&nbsp; 192.168.1.1&nbsp; 2&nbsp;&nbsp;&nbsp;&nbsp; 8 ms&nbsp;&nbsp;&nbsp;&nbsp; 8 ms&nbsp;&nbsp;&nbsp;&nbsp; 8 ms&nbsp; 10.39.120.1&nbsp; 3&nbsp;&nbsp;&nbsp;&nbsp; 9 ms&nbsp;&nbsp;&nbsp;&nbsp; 8 ms&nbsp;&nbsp;&nbsp;&nbsp; 8 ms&nbsp; 100.127.73.174&nbsp; 4&nbsp;&nbsp;&nbsp; 10 ms&nbsp;&nbsp;&nbsp;&nbsp; 8 ms&nbsp;&nbsp;&nbsp;&nbsp; 8 ms&nbsp; 100.120.100.10&nbsp; 5&nbsp;&nbsp; 118 ms&nbsp;&nbsp; 117 ms&nbsp;&nbsp;&nbsp; 22 ms&nbsp; 68.1.4.252&nbsp; 6&nbsp; ip72-221-28-166.ph.ph.cox.net [72.221.28.166]&nbsp; reports: Destination host unreachable.Trace complete.

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