07-24-2010 05:40 AM - edited 03-11-2019 11:15 AM
Hi,
I have a business Broadband, which has 5 IP addresses spread over 3 class C's supernetted for it to work each IP needs to be registered to a unique MAC address.
Is there any way I can get my ASA 5505 to have all 5 ip's on one interface, listening with 5 separate MAC's
EG:
Range 80.0.0.0 - 80.0.2.254 /22
IP1 80.0.0.212 MAC 0000:0000:00A0
IP2 80.0.0.240 MAC 0000:0000:00A1
IP3 80.0.1.35 MAC 0000:0000:00A2
IP4 80.0.1.118 MAC 0000:0000:00A3
IP5 80.0.2.228 MAC 0000:0000:00A4
All on eth0 set as the external interface.
Thanks in advance
Frank
07-24-2010 06:44 AM
Hi Frank,
Unfortunately, this is not possible. All IPs that are owned by the ASA will have the same MAC. The only exception to this is for the standby IP in a failover set.
A follow-up question though. Why does each IP need to be associated with:
- a different MAC
- a specific MAC
?
Sincerely,
David.
07-24-2010 11:22 AM
The way that my broadband works is that I get 5 IP addresses that are assigned to the cable modem, and you have to have a different MAC for each one. It would be better if they gave you a range of IP's, but they say that can't be done. So my 5 IP's are dotted about 3 subnets. I have to have a router for each one, which is a pain.
(ISP is a UK Cable Company)
Cheers
Frank
07-24-2010 11:53 AM
Hi Frank,
Unfortunately, in that case there isn't anything the ASA can do for you to help you utilize all 5 IPs.
Sincerely,
David.
07-24-2010 12:08 PM
Hello,
If you really need to have 5 different MAC addresses, then you could
probably use a L3 switch module on a router (4 port or 9 port) and put each
port on a separate VLAN. That should allow you to register separate MAC for
each public IP and you will be able to use the firewall feature set on the
router.
http://www.cisco.com/en/US/prod/collateral/routers/ps5853/product_data_sheet
0900aecd8016bf0b_ps5855_Products_Data_Sheet.html
Hope this helps.
Regards,
NT
07-25-2010 02:44 AM
The 5 Vlan method was the first I thought of, but wasn't sure about. I will give it a whirl and report back.
Thanks
Frank
07-26-2010 12:10 AM
Update:
5 Ports in 5 Vlans doesn't work.
1st interface goes in OK, but once you get to the 2nd it fires an error pointing out that they are infact on the same subnet.
Back to Square One. But thanks for the help.
Frank
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