Having not seen any config, I know for a fact that your server-because it's mask is /16 thinks that host A is on the same LAN and simply ARPs for it. The firewall if it also has a /16 subnet also thinks that Host A is on the same network. Proxy ARP is used by routers to resolve this or in the case where the 4503 and the 2950 [layer 2] they just simply send an ARP broadcast trying to find host A. The server also believes that both the C4503 and 2950 are on the same subnet so it just ARPs for them.
From Host A's perspective, it thinks that the server is on the same LAN because it sees the network 10.114.128.0 as being in the same /24 network. As far as host A is concerned the 2950 is on a totally different subnet.
To do justice to why the host cannot ping the switches we need to know the ip addresses and mask of the firewall.
Looking at the details you sent through, I don't beleive there is anyway the host can ever ping the 2950. If the firewall is the default gateway, then it needs a connection to the 2950 on a different VLAN on the 10.114.1.x subnet. Since this doesn't seem to exist I doubt any device would be able to reach the 2950. Pls confirm?
The mystery to me is why the host cannot ping the 4503. Can the server ping the 4503?
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