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Old 02-01-2011, 06:00 AM   #1
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Registered: Feb 2011
Location: delhi
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gateway got choked by NIC card of one linux system

Dear all,
I am facing a problem Please do something I will very much thankfull for him.
We are facing a problem that is
we have several servers working on 172.15.2.X series .Our mail server ip is & plateform is linux as it is squirrelmail server.other server which have the same series of ip are working on win2k3 plateform.however I try to recognise this problem by iptraf tool but can't get positive result.

Sometime the ip of all 172.15.2.X series could not ping from outside and LAN as well .
We has been temporarily resolving this problem by

1 changing gateway on all servers as well on firewall.

2 change the ethernet card on mail server and configure same ip on new one .however we have only two NIC card on mail server .The problem resolved temporarily for one OR two hour after it same problem on that card also.than again we have to do same step on switching on another NIC card and reconfigure IP and do down first one.


Take shut down for few time the mail server.

But by these all above are not permanent solution BKZ After few hours mailserver starts blocking the gateway again.

Than we want to know that what issue can be with this server

1 Are we need to configure VLAN?

2 Is that hardware problem?

3 Is this traffic overflow problem whcih is chocking the gateway of whole network machine having same gateway?

I am sending the few attachment to you please revert ASAP.But keep in mind one thing that attached document indicate the good running mailserver configuration.may be you could not found any problem in this conf.

In order to resolving this problem I have tried by changing duplex mode to

1 > 1000 MB/ps full duplex utonegotiation off

2 > 1000 MB/ps full duplex autonegotiation on

but can' get positive Result.

I have also tried by IPbinding but it was useless.

I think some thing wrong is happening in mailserver which make gateway chocked and 172 series server got also affected by this because they could not get path of gateway as it got choked by mail server's over broadcasting .Although I have make ready the old mailserver it is working but it is cabinet server & not reliable so please suggest for that problem .
Old 02-01-2011, 08:24 AM   #2
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Registered: Dec 2005
Location: Massachusetts, USA
Distribution: Ubuntu 10.04 and CentOS 5.5
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You could use Wire Shark to see the packets. Look for duplicate ACKs and out of sequence packets. These could indicate a hardware problem.


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