LC sync problem

Hi, I have the same problem with my links: Offline (Enabled) - Monitor /Common/gateway_icmp from : no reply from big3d: timed out I only have one F5 LC. I have a Laboratory with a switch L3 (IP 192.168.70.1/25 and 192.168.70.129/26) self IPs: 192.168.70.2/26(Vlan12 External) and 192.168.70.130/26 (vlan14 External) and 192.168.70.193/26 (Vlan16 Internal)

I review al the SOL5663, all ok, the bigip_gmt.conf:

gtm datacenter /Common/Default_DC { } gtm link /Common/Link_COLT { datacenter /Common/Default_DC monitor /Common/gateway_icmp router-addresses { 192.168.70.1 { device-name /Common/Link_COLT } } service-provider COLT uplink-address 192.168.70.2 } gtm link /Common/Link_MOVISTAR { datacenter /Common/Default_DC monitor /Common/gateway_icmp router-addresses { 192.168.70.129 { device-name /Common/Link_MOVISTAR } } service-provider MOVISTAR uplink-address 192.168.70.130 } gtm server /Common/f5.santfeliu.cat { addresses { 195.77.247.155 { device-name 195.77.247.155 } } datacenter /Common/Default_DC monitor /Common/bigip virtual-server-discovery enabled } gtm global-settings metrics { metrics-collection-protocols { icmp } } gtm global-settings metrics-exclusions { addresses none }

any help please! Thanks.