How to Configure Secondary IP on inside interface of ASA 5520
Hi, We already have a subnet defined to inside interface and is in produciton. the default gateway is this interface ip. In that setup now I have to add one more subnet and as the first subnet is been defined in ASA indside interface, I have to assign secondary Ip to the inside interface so that new subnet users can easily reach here and go outside.
MY ASA is not internet facing but is facing my private MPLS cloud.
I would expect this has limitations but I can't say for sure as I have never resorted to it myself. It might not even work anymore depending on your software. I would suggest looking at the whole network setup, perhaps handling this with a real router instead of ASA. Perhaps configuring a Trunk between ASA and some LAN Switch and creating a separate ASA interface for both subnets.
But this is just my personal suggestion. I always try to keep things simple and avoid special setups. In the long run you might either be causing a bigger headache for yourself or just end up doing the change which would have been best in the first place
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