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most of the time,Not able to ping to servers in same vlan

Hi,

From one server I am not able to ping to another server in same vlan (same switch).

this does not happen all the times.

sometimes i am able to ping to some servers. after sometimes i am not able to ping to same severs (servers which responded for ping few minutes back)

Default gateway for all the servers is the interface of Firewall.

since i am trying to ping to servers in same vlan, i believe traffic is not forwarded to firewall.

the issue lies on switch or firewall?

Please help me to sort out the issue.

Regards

Vinod

3 REPLIES
Hall of Fame Super Silver

Re: most of the time,Not able to ping to servers in same vlan

Hello Vinod,

the firewall should not be involved if the correct subnet mask is configured on the server

so check ip address and subnet mask of the server

also check over time the ARP table of the server and compare the entries for the other servers with the other servers MAC addresses

if ARP entries are correct and do not change over time you should check the lan switch

Hope to help

Giuseppe

Cisco will donate $1 to  the Red Cross Haiti fund for every useful rated post!

https://supportforums.cisco.com/docs/DOC-8727

Community Member

Re: most of the time,Not able to ping to servers in same vlan

Hi

Thanks for your reply.

The subnet mask are the same for all servers.

Please let me know , what is that i need to check on the lan switch.

Re: most of the time,Not able to ping to servers in same vlan

Hi,

From one server I am not able to ping to another server in same vlan (same switch).

this does not happen all the times.

sometimes i am able to ping to some servers. after sometimes i am not able to ping to same severs (servers which responded for ping few minutes back)

Default gateway for all the servers is the interface of Firewall.

since i am trying to ping to servers in same vlan, i believe traffic is not forwarded to firewall.

the issue lies on switch or firewall?

Please help me to sort out the issue.

Regards

Vinod

Hi Vinod,

As both the servers are connected with same switch,Just check out the few things as they should ping each other if they are in same vlan.

Check out the arp entry in switch

Check out any firewall or any inbuilt anitivirus which is blocking the traffic in the servers

Are you able to self ping the server ineterface and from switch are you able to ping both the servers.


and as suggested check out the subnet mask for both the servers also.

Hope to Help !!

Ganesh.H


Cisco will donate $1 to  the Red Cross Haiti fund for every useful rated post!
https://supportforums.cisco.com/docs/DOC-8727

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