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In your situation I would simply use the ASA as a DHCP that hands out its internal IP as the DNS server, use DNS proxy to the tunnel DNS and have several public DNS's listed in the config. EG. (these commands work on c3900 equipment ios15.1, you may have to make changes to be compatible to the ASA software) service dhcp ip domain nameserver "tunnel dns" ip ...


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ip address 10.10.0.1 255.255.255.0 Your router will not be able to reply to the data it's being sent, because it itself is restricted to the original /24. Change this to ip address 10.10.0.1 255.255.252.0


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I'm not an STP expert, but I'll take a crack at this. The brief loss of connectivity sounds like the expected behavior to me, based on what happens during an STP topology change. When the STP topology changes (due to a switch port transitioning to or from the blocking or forwarding state, because a switch or uplink is added, removed or fails), some frames ...


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Allow error messages at a minimum. If you block error messages you'll cause timeouts because a system keeps waiting for something that will never happen and it won't know about that because the error message that would have told it that was blocked. Things like redirects can usually be blocked, but depending on your network architecture it might cause less ...


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There is a similar report on the Zabbix bug tracker at ZBX-8681, which was closed as a duplicate of ZBX-7190. You might wish to add additional information (hardware, tcpdump, Zabbix log) to the latter issue.


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You may find port 25 is a management port so may only allow traffic from itself. You can plug the router into any port so try that first. Alternatively you may have VLANS setup incorrectly especially if you use IP phones. If this is the case you will need to setup the Blue ports to be trunk ports.



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