Cisco 897 dialer "ip verify unicast source reachable-via rx allow-default" vs "ip verify unicast reverse-path"

[Luca Pecchiari]

Hello to everybody

i was trying to compare "ip verify unicast source reachable-via rx allow-default" vs "ip verify unicast reverse-path" to apply it on the dialer interface on a cisco 897 configured with vdsl line connected to an isp

which one is the best?

My idea is remove the antispoofig acl, and undertand the difference.

Thank you

[paul driver]

Hello
ip verify unicast source reachable-via rx allow-default"

enables strict rpf when a source ip address of a packet isn’t in the route table of the router and so allows it to use a default route as validation.

ip verify unicast reverse-path 
Is rpf for security devices such as firewalls 

[Luca Pecchiari]

but i can enable both on my router