Server A can ping Server B, however Server B can't ping to Server A

[tinchan2010]

Hi All,

I have some issues on my connectivity, and really need help, why this could be happen?

Scenario:

Server A --> Switch 1 --> Core Switch 1 -----------> Core Switch 2 -----> Switch 2 --> Server B

Loc A                                                                             Loc B

there's ACL filter in Core Switch 1 and 2 which is i configured as:

permit ip X.X.X.X host Y.Y.Y.Y. host  (core switch 1)

permit ip Y.Y.Y.Y host X.X.X.X. host  (core switch 2)

which is

X.X.X.X = host server A

Y.Y.Y.Y = host server B. 

from the server A to server B, there's no issue, can ping and traceroute successfully. 

but from server B to server A, can't get through. 

core switch 1 can ping server A. 

[Aaron Harrison]

Hi

Usually it's that Server B is running a firewall that prevents it... e.g. the Windows built-in firewall.

Inspect the ARP cache on the layer 3 interface closest to server B to see if it gets an ARP response or not. If it does, but that layer 3 interface cannot ping it, then it's a firewall.

Aaron

[tinchan2010]

tq aaron, will let my client to check on the arp setting..