Vip ip issue

[AA_GSOC]

Hi all we have cluster deplyment in our environment , but some how one firewall is down and single firewall is working, we have one interface configured with 10.1.1.1 vip, when we confgure a server in same subnet 10.1.1.100 and we are using vip ip as aerver gateway server is unavailable. If we change the gateway with physical ip its started working even we check the maç address on switch virtual and physical ip having same mac address. Can some one look into this and give us solution?