sh ver | i IOS|(revision)
Cisco IOS Software, 2801 Software (C2801-ADVIPSERVICESK9-M), Version 12.4(3g), RELEASE SOFTWARE (fc2)
Cisco 2801 (revision 6.0) with 235520K/26624K bytes of memory.
We've been seeing our WAN connection drop every 20 minutes or so. (Give or take 5-10 min)
This router is connected to a Time warner cable modem (Zyxel). We are using GRE over IPsec to tunnel the traffic.
Basically what we are seeing is we see the connectivity drop, and will not restore until the ARP table is cleared.
They've replaced the modem and done numerous config checks on it. and nothing comes back of intrest.
So one thing I did see that makes me think its an issue on TW side of things is when i do a debug arp I see alllll of TW's ARP traffic being forwarded from their upstream router. I don't see this traffic on any of our other routers with similar configurations. But this along with the fact that a "clear arp" litterly fixes the issue in seconds makes me think its the problem.
I honestly have never seen anything like this and would be intrested in any opinions.
I attached a quick log of a debug arp. I also X'd and Y'd out our real ip/mac.