IP Passthru is a GTA supported function. The configuration I attempted to describe does not require proxy ARP ... all required addresses are defined on the EXT interface. It does require the GnatBox internally to do interface based routing and since GnatBox claims to support use of an external address on an internal network, I surely would complain.
I don't remember anywhere where GTA documents overlapping address ranges, which surely IS bad network design.
I disagree with your opinion of the network design. IP Passthru is the basic firewall approach advocated by the gurus in the IETF leadership, in particular not to use NAT.
That's not what I meant, I meant proxy arp is bad, not passthrough!
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