Losing 1-3% ping packets between router (Sophos) and local Mediacom modem on the local address (10.x). Ping from inside Mediacom CMTS to modem comes back fine - indicating it is a problem between the router and the modem. Rebooting the router does not change. However, unplugging the modem does. Once unplugged, it will work without ping packet loss for a random amount of time (1 hour to 3 days) and then it will start dropping again. The biggest effect is our IPSEC VPN for upload slows from 10 Mbps to 0.1 Mbps (download stays the same) when the ping shows dropped packets.
I have tried a different router, used a shielded cat 5e cable instead, and most recently moved the Mediacom modem to another room in an effort to make sure electrical fields weren't an issue. We have been dealing with this issue with Mediacom for over two months and am running out of ideas. We replaced the modem a few weeks ago, as the previous one would just lose connection for two minutes every few hours. (Mediacom could not diagnose it, only replaced on my request)
Any further ideas or tips? It definitely seems to be the upload only side.
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