I'm facing an issue with a customer where the internet connection is intermittent. The topology is as follows:
This deployment was needed because the Cisco router has only one FastEthernet Interface and a Serial Interface. The serial is use for a dedicated channel and the FastEthernet for the LAN connection. The Cisco router is the Default Gateway to the LAN and it has a default route that forward all the unknown traffic towards the AT&T modem to reach internet. (route 0.0.0.0 0.0.0.0 10.0.1.102)
Sometimes the internet connection gets down and some other it only has high response times. AT&T has changed the DSL Modem but the problem persists. I starting to think the proble could be the connection between the Cisco Switch and the Router. I checked the interfaces and put the Output in the Cisco Output interpreter and it point to some Underruns and Overruns. Also I checked the buffers and the Output Interpreter said that it could be a Buffer Leak. I'm not really into the Buffer stuff so I don't know what to do to troubleshoot this.
I'm attaching you the sho-tech for both the Router and the Switch just in case you can give me a light to solve this issue.
Thanks in advance