I have a Cisco ASA 5510 running 8.2(5) firmware, "base" license and 1GB memory.
Currently we have a running/working network on 192.168.100.0 (Ethernet0/1) that uses comcast (Ethernet0/2) for the ISP.
There is also a T1 at the location that we would like to utilize for the VOIP phones. Is there a way to assign an available ASA port (Ethernet0/3) 192.168.123.1, and have anything on that port use the T1 for internet? I did assign port 3 192.168.123.1, and also set up DHCP on that interface, but when I plug in my laptop -- I do get internet (I created a dynamic NAT rule) but it's going out the comcast isntead of the T1 interface.
How do I force outbound traffic on Ethernet0/3 to use Ethernet0/0 for internet? I'm thinking it has something to do with interface security level? I an unfamiliar with command line so if anyone knows how to accomplish this in ASDM that would hlep.
Here is what I have set up for the interfaces so far:
Ethernet0/0 (name = outside, security level = 1, IP address is public IP of T1)
Ethernet0/1 (name = inside, security level = 100, IP address is 192.168.100.1)
Ethernet0/2 (name = comcast, security level = 0, IP address is public IP of comcast)
Ethernet0/3 (name = VOIP, security level = 100, IP address is 192.168.123.1)
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