I have an 871W router and am attempting to use SDM to configure the firewall functions. When I go through the firewall configuration (basic or advanced and it does not matter which setting I choose. Low/Medium/High) the firewall applications appears to configure correctly and I have network access to my ISP with no issues.
As soon as I reboot the 871W, that same configuration that appeared to work ok prior to the reboot, now will not allow any access to the ISP. I lose any routing I initially had through fa4 to my ISP.
I then have to fall back to my previous, no firewall configuration in order to restore any network connectivity to my ISP.
It is as if the NAT access is being overruled. I enter the affirmative when it quizzes me about allowing the NAT connections to pass through the firewall.
Any help here is most appreciated.