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ASA 5505 - Static ISP address and Mac address off switch ports

Unanswered Question
Sep 11th, 2013
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Hi,


I´m having problems in configure my ISP Static address.


After reading I know that ASA 5505 share phisical mac address to all ports off the switch. And in ASDM I access to the interface and in advanced option is possible to configure one mac.


But when I run sh interface ethernet in every port, shows the same mac. But whith the sh interface vlan 1, shows the mac inserted manualy.


Which of the macs should I give to my ISP? The phisical interface or the vlan interface?


If I change the VLAN mac, isn´t that mac that is fixed to the layer 2 datagram?


Kind Regards,


AS

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Jouni Forss Wed, 09/11/2013 - 18:17
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  • Super Bronze, 10000 points or more

Hi,


It should me the MAC Address of the Vlan interface.


I tested this once for someone here on the CSC when they were having a problem when they replaced the firewall and lost connectivity because ISP still had the wrong ARP table information (same public IP but different MAC)


I for example confirmed that I could configure the same MAC address that they had to my ASA5505 and see that at our ISP core devices ARP table (I work for the ISP)


- Jouni

Antonio Simoes Wed, 09/11/2013 - 18:22
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Hi Jouni,


But I changed it too in the interface option, but the ping didnt pass. I will talk to their support, maybe thay have extra security methods or sometihng.


Kind Regards,


AS

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