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Re: [Xen-users] Re: Dom0 network restart required

To: "Fajar A. Nugraha" <fajar@xxxxxxxxx>
Subject: Re: [Xen-users] Re: Dom0 network restart required
From: Tanuj Bansal <bansal.tanuj83@xxxxxxxxx>
Date: Wed, 16 Dec 2009 03:56:27 +0530
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1. it is using static IP
2. we use routing to reach the server.
bridge name     bridge id               STP enabled     interfaces
xenbr0          8000.feffffffffff       no              peth0
xenbr1          8000.feffffffffff       no              peth1
xenbr2          8000.feffffffffff       no              vif4.0
xenbr3          8000.feffffffffff       no              vif4.1
xenbr4          8000.feffffffffff       no              peth4
xenbr5          8000.feffffffffff       no              peth5
xenbr6          8000.000000000000       no
xenbr7          8000.000000000000       no
xenbr8          8000.000000000000       no
xenbr9          8000.000000000000       no
4. yes, dom0 ping the gateway
5. yes, domU ping the gateway
My all domU are fine and accessible thoughout.
when I use arping -b -I eth0 gateway  on dom0, server became accesible.
so where may be issue, network team says no issue there side.

On Sat, Dec 5, 2009 at 5:51 PM, Fajar A. Nugraha <fajar@xxxxxxxxx> wrote:
On Sat, Dec 5, 2009 at 1:01 PM, Tanuj Bansal <bansal.tanuj83@xxxxxxxxx> wrote:
> anyone please help here?

You're being to vague, asking for help but not providing any
additional info. Like the simple ones:
- do you use static IP or DHCP
- which networking setup you use, bridged or routing
- what does your bridge setup looks like (output of "brctl show")
- can dom0 ping the gateway
- can domU ping the gateway

etc, etc. ...

However my guess is your switch/router/gateway simply don't cache your
dom0's arp entry. Next time this happens, try using arping from dom0.
So if your dom0 interface is on eth0, and your gateway is
(just an example), you can try running (as root)

arping -b -I eth0


> On Fri, Dec 4, 2009 at 11:57 AM, Tanuj Bansal <bansal.tanuj83@xxxxxxxxx>
> wrote:
>> I am using Xen on Para virtualization and sometimes my dom0 having network
>> issue while at the same moment I am able to access all DomU from network.
>> to fix the issue I always restart Dom0 Network and it fixes the issue.
>> Can anyone please let me know the cause of this?

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