I've run into this config on Cisco firewall:
nat (IFNAME1) 99 0.0.0.0 0.0.0.0 outside
global (IFNAME2) 99 100.100.100.100 netmask 255.255.255.255
It looks like an ok PAT config that would translate IP address of packets coming on interface IFNAME1 then they go out through IFNAME2.
Could someone explain to me what does the keyword "outside" at the end of 1st line nat statement mean? Because all the examples I've found online do not have this "outside" keyword. Maybe it allows reverse translation if packets would come to IFNAME2?