I have 2 subnets on a switch, connected to a router. The attached diagram should show the setup. The firewall controls communications between the 10.45.45.0/25 and the 10.75.75.0/24 subnets, however, the firewall is the gateway for the 45 subnet, not the 75 subnet.
For traffic to get from 45 -> 75, there is 1 hop, the firewall. For traffic to get from 75 -> 45 there are 2 hops, switch, then firewall.
Traffic will not pass from 75 -> 45 when the gateway is set to the switch, but will when it is set to the firewall, even though the switches default route is the firewall.
Does anyone have any idea what would cause this to happen?