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[Xen-users] can't ping / connect to aliased IP from internet

To: xen-users <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: [Xen-users] can't ping / connect to aliased IP from internet
From: Rudi Ahlers <Rudi@xxxxxxxxxxx>
Date: Sun, 06 Jul 2008 12:17:10 +0200
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Hi all

I have a very strange problem. One of our servers run CentOS 5.1 x64, with the default Xen from CentOS repositories, and then I'm running Windows 2003 & CentOS 5.1 XEN domU guests on it.

Both the Windows & Linux domU's have 2 IP's to connect to from the internet. But on the Linux domU I can only connect to one of it's IP's, the other one refuse to accept connections from the internet. From the dom0 I can connect to both IP's, and when I setup a new domU VPS, I can connect to the IP in question as well. I can add a 3rd IP to the Linux domU, and connect to that as well.

So, the XEN server is on x.x.x.47, with the Linux domU on x.x.x.48 & x.x.x.49 - I can connect fine to x.x.x.48, but not x.x.x.49. If I add x.x.x.52 to the domU, I can connect to x.x.x.52 as well.

I have also gone as far as setting up a new Linux domU using x.x.x.49, and then it works fine, but I need both .48 & .49 on the same Linux domU (and software). There's no firewall setup at all.

So, how / where do I debug this?


Kind Regards
Rudi Ahlers
CEO, SoftDux

Web:   http://www.SoftDux.com
Check out my technical blog, http://blog.softdux.com for Linux or other 
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