The ASA has the default proxy ARP defined on all interfaces.

We were not sure why both ISP router MACs were showing up multiple times in the ASA ARP table. Show ARP from ASA5545 After CrashĪfter the crash, the customer reported that ASA5545 showed this show arp output: ASA5545/act# sh arp We never got a chance to see the issues while happening - the customer tested it without asking us to watch. He then needed to remove the AdTran router connections from the ISP switch, and clear the ARP table on the ASA. The customer stated after connecting the AdTran router, the connections to the ISPs were dropped. Note: The 2960X-ISP is a Layer 2 switch with no SVIs in VLAN 800 or 801. Total Mac Addresses for this criterion: 27 Note: We believed the customer had mis-labeled the VLANs going to his two ISP routers. The customer provided a sketch of the environment that looked something like this:Īfter reviewing the switch and ASA configs, we updated the diagram to illustrate what we believed was actually configured, and shared it with the customer. They want to put it beside ours but that is the scenario that isn’t working.” We can put it in front of our firewall, not preferred, behind, etc. Can we engage you to assist with this issue so that we can get the vendor VoIP router connected? This needs to be fairly immediate engagement as we are looking to deploy VoIP in less than a month and have been trying for almost a month to deploy their router. When added to our edge switch, it brings down both ISP circuits and so our network connections drop. “We have a problem with our VoIP vendor and a router they are trying to add. My colleague and I have been supporting a customer who had complained about a new AdTran VoIP router added to his environment that was causing his ISP circuits to go down.

Troubleshoot cisco mac address table