01-03-2010 08:32 AM - edited 03-11-2019 09:53 AM
Is it possible to add a secondary address to an internal interface in order to combine two internal lans on the same physical one, like you can do with most l3 routers?
Thanks, Roger
01-03-2010 08:48 AM
Hi,
>Is it possible to add a secondary address to an internal interface ------------ do you mean to a pc or a server NIC , ---- YES. we can set a second ip address for the other LAN
>in order to combine two internal lans on the same physical one, like you can do with >most l3 routers?
hope it helps
Yang
01-03-2010 09:20 AM
On a traditional router, you can do this to have a shared lan:
Interface g0/0
IP address 10.10.10.1 255.255.255.0
IP address 10.20.20.1 255.255.255.0 secondary
allowing hosts using either address range to use the same routed interface, and
share the same physical lan.
I don't see any way to do something similar with an internal asa interface, which
would be very helpful to expand the size of an internal network.
Roger
01-03-2010 09:55 AM
can we use the sub-interface instead of one interface with second ip address,
I guess it would be more clear for the network design, right ?
hope it helps
Yang
01-03-2010 10:33 AM
Well, a sub-interface is a fully functional second lan. This is not what I need to accomplish
my intended use.
Roger
01-03-2010 01:40 PM
Hello,
Cisco ASAs are not designed to support secondary addresses at this point.
May the developers see the customer's demands online..
HTH
Vijaya
01-04-2010 05:40 AM
People with this requirement point the route to the interface IP in which case FW will arp for the destination IP.
Pls. read command reference here:
http://www.cisco.com/en/US/docs/security/asa/asa80/command/reference/qr.html#wp1767323
If the route command uses the IP address from one of the interfaces on the security appliance as the gateway IP address, the security appliance will ARP for the destination IP address in the packet instead of ARPing for the gateway IP address.
-KS
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