I'm fairly new to ASA firewalls so some help is appreciated. Can anyone explain the point of the below config. I thought that normally when using Vlan's there would be no point on configuring a nameif & security level on the main interface? In this case what would configuring an ACL based NAT exemption on the Trunk interface do to traffic on the sub interfaces?
no ip address
ip address 192.168.100.1 255.255.255.0 standby 192.168.100.2
ip address 192.168.101.1 255.255.255.0 standby 192.168.101.2
ip address 192.168.102.1 255.255.255.0 standby 192.168.102.2
If you use subinterfaces, you typically do not also want the physical interface to pass traffic, because the physical interface passes untagged packets. Because the physical interface must be enabled for the subinterface to pass traffic, ensure that the physical interface does not pass traffic by leaving out the nameif command. If you want to let the physical interface pass untagged packets, you can configure the nameif command as usual.
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