Just an update on this, when I add x.x.136.105 to the domU, and ran nmap on that IP, the IRC ports are open, so that confirms my "theory" - this is then a routing issue between the dom0 & domU, right? But how do I fix it? On 8/10/08, rudiahlers at gmail.com <rudiahlers at gmail.com> wrote: > Hey Kai, > > I just made an interesting discovery. As I said in my previous post, > the domU is running on a different subnet from the dom0 - and although > the traffic from the dom0 to the domU doesn't travel via a switch, it > does seem like this is causing a problem > > The dom0 is on x.x.136.110/27 (x.x.136.97 = default gw) and the domU > is on x.x.136.55/27 (x.x.136.33 = default gw) > The subnet mask on both are 255.255.255.224 > > The server connects to a switch, and then to a firewall on the > internet. The network firewall itself has 4 WAN ports, and 4 different > subnets. For a fact, I know I can't communicate with a host from one > subnet, to a host on another subnet, since the network firewall > doesn't allow it. > > So, I have a feeling this affect the networking on the Xen server as > well, even if I take the network firewall out of the picture. > > How do I work with a XEN domU on a different subnet than the XEN dom0? > > On 8/10/08, Kai Schaetzl <maillists at conactive.com> wrote: >> Rudiahlers at gmail.com wrote on Sun, 10 Aug 2008 14:11:06 +0200: >> >>> >> 443/tcp closed https >> >> sorry, I dind't look close enough. "closed", of course, means closed ;-) >> >> Did you disable firewall for testing on *every* host that is involved >> (e.g. on the hosts you try to access/run nmap from), including the >> gateway? Is this the only IRC service you have running? I'd rather guess >> you don't have a xen problem, but simply block that port somewhere on the >> way, and be it on your gateway. Running tcpdump on every involved host >> may >> help. >> >> Kai >> >> -- >> Kai Schätzl, Berlin, Germany >> Get your web at Conactive Internet Services: http://www.conactive.com >> >> >> >> _______________________________________________ >> CentOS mailing list >> CentOS at centos.org >> http://lists.centos.org/mailman/listinfo/centos >> > > > -- > > Kind Regards > Rudi Ahlers > -- Kind Regards Rudi Ahlers