Hello
As your router will have connected interfaces to these ISPs , You shouldn't have to use two default statics just the primary would be required with an addition of a PBR rule however please note applying statics in this way without any king of conditional rule would not give you any resiliency if the primary ISP became unavailable.
Note: the resiliency can be accomplished by utilising IP Sla and Object tracking (not shown)
Please review below..
ip nat inside source list 1 interface <ISP1> overload
ip nat inside source list 2 interface <ISP2> overload
ip nat inside source static 192.168.100.10 10.11.12.4
ip nat inside source static 192.168.100.20 10.11.12.5
ip nat inside source static 192.168.100.30 10.11.12.6
access-list 1 permit host192.168.100.10
access-list 1 permit host 192.168.100.20
access-list 1 permit host 192.168.100.30
access-list 2 deny host 192.168.100.10
access-list 2 deny host 192.168.100.20
access-list 2 deny host 192.168.100.30
access-list 2 permit 192.168.100.0 0.0.0.255
route-map STAN permit 20
match ip address 1
set ip next-hop 10.11.12.1
int xx
description Lan facing
ip nat inside
ip policy route-map STAN
int xx
description ISP1
ip nat outside
int xx
description ISP2
ip nat outside
ip route 0.0.0.0 0.0.0.0 <iinterface isp2) 20.21.22.1
res
Paul
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Kind Regards
Paul
