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PAT on internet router

I'm planning to implement PAT on the Internet router, what's wrong with the pat configuration below:

ip nat pool Finance-Pool 74.74.74.101 74.74.74.101 netmask 255.255.255.252

ip nat inside source list Finance-Range pool Finance-Pool overload

ip access-list standard Finance-range

permit ip 10.10.10.0 255.255.255.0

I have an ASR 1k runing IOS XE, for some reason it does not let me enter netmask 255.255.255.255 but it let me enter 255.255.255.252

Any ideas?

Any input is valuable.

Thanks in advance.

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PAT on internet router

Thats the minimum allowed netmask for nat

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