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Question on best practice for NAT/PAT and client access to firewall IP

Imagine that I have this scenario:

Client(IP=192.168.1.1/24)--[CiscoL2 switch]--Router--CiscoL2Switch----F5 Firewall IP=10.10.10.1/24 (only one NIC, there is not outbound and inbound NIC configuration on this F5 firewall)

One of my users is complaining about the following:

When clients receive traffic from the F5 firewall (apparently the firewall is doing PAT not NAT, the client see IP address 10.10.10.1.

Do you see this is a problem? Should I make another IP address range available and do NAT properly so that clients will not see the firewall IP address? I don't see this situation is a problem but please let me know if I am wrong.

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