On 9/11/07, Jun Salen nokijun@yahoo.com wrote:

...

Hi List,

My Mail/Proxy server has from time to time refuse to accept accept network connection. If I restart the network service, the service will again start to accept connection but after some time will again refuse connection. I use CentOS 4.5 with Squid, DansGuardian, Postfix. Please can someone point me what are the possible cause of this. Thank you.

In addition to my posting above. When I make ping to other machine from the server, the server will again restore and accept connection. This is weird, so my temporary solution is to let the server continually ping other machine. Please help. Thanks again.

Ping is a very cheap and acceptable solution !

Anyway you'r certainly curious about the problem :-) This is a problem about ARP request. Maybe another machine with low activity share the same IP or your swith/hub is badly configured ! You can use arping to detect any device with the same IP and tcpdump to look for arp request."arp -an" will show you the arp table.

Regards

junji aisalen.wordpress.com Linux Registered User #253162

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