Cisco ASA -- weird connection issue
Posted on 2016-10-24
i've never seen this issue before so i'm running it through the experts while i'm waiting on cisco support to get back to me.
I recently configured a cisco asa 5516 with fire power. All security settings are disabled so the unit is simple working as a router\dhcp for the time being. We have cable modem as our ISP with a block of 5 ip.
We've been experiencing packets drops out to the web on and off throughout the day. To prove my point that it was ISP isues i setup a computer connecting directly to the modem, i ran continous pings to an internt host the connection showed to be spotty. The ISP came over, ran their tests, etc. When they disconnect the firewall from the modem everything worked, meaning the computer with the public IP did not drop any packets or had issues, as soon as the firewall was connected back to the modem the compuer with the public IP started having issues. Since it didn't make any sense to me i changed cables, used the same ports of the modem we used for successful tests, i had them change the modem just in case, i hard coded the interface speed on the FW end to no avail.
Honestly i don't even know what to make of it but if any one has seen anything like this before and wants to share some thoughts i'm open to suggestions.