Hi all,
I am experiencing a very strange behaviour. We have a Cisco 886G, configured for simple internet access. See the sanitized config attached. The problem is, that from time to time the internet access is not possible any more, from internal to internet and also the remote access via ssh is not working any more. In that moment the WWAN LED goes from a steady state to a blinking state. With the tests, that I made I could see, that the connections lasts a long time, when I only ssh onto the router, then the connection stays up to 1 hour. But in that moment, I start using the internet from one of the internal clients, connected to one of the fastethernet ports, the Connection goes down. In the moment, I can´t say, what exactly happens, but for me it looks like, that in the moment there is traffic from the internal client, the connections drops.
Any ideas?
Found this guide: http://www.cisco.com/c/dam/en/us/products/collateral/interfaces-modules/high-speed-wan-interface-cards/prod_qas0900aecd806e0563.pdf
Some interesting statements:
q: "Activation is successful but I am experiencing data connectivity failures, interface flapping, reset, etc. What is wrong?"
a: "The service provider drops the connection if the traffic is not sourced from the IP address the provider assigned to the cellular interface; the command is source ip validation. To avoid this occurrence, ensure that the LAN traffic going over the cellular interface is restricted by using access lists, Network Address Translation (NAT), or generic routing encapsulation (GRE). "
Could it be related?
How can I debug that problem?
Regards
