Cannot ping the servers behind F5 which is acting as the default gateway

hello,

i have my BIG-IP configured as the default gateway for the servers and have them in two VLANS 10.154.62.0/25 and 10.154.63.0/25 and also have a forwarding vs with all ports enabled but still unable to ping the servers. when i do a trace route for any of the server the request is timing out at one of the selfip's of the F5. please advice the possible solutions. thanks in advance.