Half ping VS cannot be successful

davidy2001what happens if you perform a tcpdump on the eth1.1 interface of the active BIG-IP? The following is most likely what you need to capture this traffic and should be run on the active BIG-IP.

tcpdump -nni internal host 10.0.20.110

My guess is that the BIG-IP isn't persisting your ICMP request to the same destination which is why you are receiving partial loss of communication. If the tcpdump reflects that you might try the same test after implementing source IP persistence to the virtual server.

Hi davidy2001 , 
    
> I think in this Case you have one of your routers down. 
so open F5 cli and write this command " ping 10.0.20.2 '' also " ping 10.0.20.3 " your routers , to test reachability for both routers from F5 perspective first. 
if your Ping gets reply from both of routers , we will troubleshoot for another workaround. 

> Also , Send a snap shot from the pool that you put both of routers " 10.0.20.2 , 10.0.20.3 " and assigned it to 
" virtual server 10.0.30.222 ". 
you will find it in ( local traffic , pools " select the routers pool I mean " 10.0.20.2 , 10.0.20.3 " , select members Tab ) 
you should find view like this : 
 
> Also try to ping from Router " 10.0.30.1" to " virtual server 10.0.30.222 " 10 times as you did before. 
and issue this command in Tmsh F5 cli " show sys connection cs-server-addr 10.0.30.222 ". 
send a snap shot from the command output , issue this command after ping directly after stopping ping from router ' do not exceed 5 seconds ' to find the output of active connections. 

I hope this help you 
Ty 

Paulius Please see below:

Mohamed_Ahmed_Kansoh , I checked the two nodes, and both should be Ok. but I found other virtual servers do not have the issue. So it is this virtual server that has the issue. so replacing it would be fine. 

Thank you all!