Unable to communicate betweent two servers, need to run ping after 5 mins

Unanswered Question
Oct 6th, 2008

We are having a slight problem with the connection between one of our servers and it communicating on another server.

It seems that the connection between the 2 host devices is timing out It seems to resolve this, we can simply ping from the server but this is not something we want to do every 5 mins for ever.

Although the server blocks echo reply from their server, we have temporarily setup a cron job in our server to ping (with timeouts) every hour to put a temp fix in place. However, this is only a band aid for the time out problem as creating a cron job is not the best solution for this trouble.

Can you please help me investigate this issue. Has anyone have had the same problem?

I have this problem too.
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Istvan_Rabai Mon, 10/06/2008 - 18:14

Hi Shir,

I'm afraid we will need to know more about your environment.

Having scarce information I can only make a supposition:

The traffic between the 2 servers is unidirectional for more than 5 minutes, this is why the switch clears the mac-address of the receiving server from its mac-address-table (5 minutes is the default aging time for mac-addresses).

When you ping from this server to the sending server, an arp request is issued that makes the switch relearn the mac-address of the receiving server.

From then on the communication works for 5 minutes and the process repeats.

If this is the situation then one solution could be to configure a static mac-address for the receiving server on the switch port and vlan where it is connected.




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