Cisco ASA 5505 Outisde Interface MAC?

I'm going to be installing three Cisco ASA 5505's, the ISP is assigning a static IP to the device via a DHCP reservation.  So they are naturally requesting the MAC address of the three devices.

I used the command "show int outside" to get the MAC and thought I was all set.  I tried setting up a reservation for one of the devices on my network just to make sure all was well.

Show int outside returns the MAC of: 6400.f16e.1084
However when I look at the DHCP table on my server it says the device MAC is:

636973636f2d363430302e663138342e663430312d6f7574736964652d636973636f61736100

What gives?  How can I get the proper MAC to provide to my ISP?

BTW my DHCP reservation for 6400.f16e.1084 was ignored.

Thanks in Advance.

RailroadAsked:
Who is Participating?
 
RailroadConnect With a Mentor Author Commented:
I figured it out needed to add the command:

dhcp-client client-id interface outside

That reports the proper MAC to the DHCP server.
0
 
MikeKaneCommented:
The "show int outside" does reflect the hardware MAC of the interface, showing the 12 hex character MAC address along with MTU.    I have no idea what that long number represents.

If you put a switch in front of the ASA, and list MAC addresses on the switch, does it show up correctly?  

0
 
John MeggersNetwork ArchitectCommented:
On the 5505, interfaces are assigned to VLANs.  The interface name is associated with the VLAN, not the physical address of the Ethernet interface.  I suspect the MAC you saw was for the virtual interface, not the physical one.  Do "show interface Ethernet0/0" and see how that compares.

Can't explain the long address from your server.  That seems odd.
0
 
RailroadAuthor Commented:
@MikeKane  What is the command to see MAC's on the switch?  It's a 2960.

@jmeggers  Yes the MAC for E0/0 is different, added a reservation for that MAC and it was ignored too.
0
 
RailroadAuthor Commented:
Proper solution
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

All Courses

From novice to tech pro — start learning today.