On 19/07/2011 08:14, James Hogarth wrote:
>
>
> > I built a CentOS 6 machine to host several CentOS 6 guest servers.
> As all guests will be Internet facing I set up the host with two
> bridged NICs and assigned an Internet facing IP address to br0 and a
> local IP address to br1.
> >
> > Each guest was installed using br0 and br1 with virtio drivers. On
> each I assigned an Internet facing IP address to eth0 and a local IP
> address on eth1. So far so good. I can access the guest servers from
> either IP address as expected. That is HTTP, SSH and SMTP servers on
> them are accessible and do what they are supposed to do.
> >
> > Except... Except from any location outside of my Comcast Cable
> Modem. To be clear, from any machine inside the modem to any address
> on the guests, all works perfectly. But outside the modem the guest
> apps either don't receive packets or for some reason don't respond,
> and I've tired it from four different locations.
> >
> > Using Wireshark on the guests I can see the packets arrive from the
> outside sources, but no response is seen. On accesses from inside I
> can see both incoming and outgoing packets, as expected.
> >
> > I can ping the outside sources from the guests, yet pings from the
> outside sources get no response from the guests. All the outside
> sources get responses when pinging the host. I can ping the guests
> from any inside machine.
> >
>
A bit of a long shot but does turning on STP on the br* interfaces help?
I vaguely remember I had to do the following on one of my machines that
uses bonding + bridges:
# brctl stp br0 on
I have put this in the machines' /etc/rc.local so it's applied upon
every reboot.
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