On Fri, 2010-05-14 at 12:39 -0700, Dave Stevens wrote: > Hello All, > > I don't have any reason to believe CENTOS (5.4) is underlying my > difficulties but it's what I've got to work with so here's the setup: > > I have a 2P motherboard with 2 Opteron 2376s and two ethernet ports. > The setup is fully virtualized, with Dom0, dom4 and Dom1 up and > running. dom4 is attached to a dhcp service on eth0 and has no problems. > > I've recently connected dom1 to eth1. eth1 is connected to a dsl modem > (no router) and to the ISP's dsl signal It has a static IP address, > 204.174.35.205. At intervals of a few hours the dom1 service on eth1 > became inaccessible, not responding for either web or ssh access. eth0 > on another provider's network remains up at this time. I can fix the > availability issue by ssh'ing to the eth0 side, then ssh from there to > dom1 (at 192.168.0.117) and then from the inside out ping any external > address, it doesn't seem to matter which one. Then the connections get > through and all is well for a while. > > I have a workaround in place with this command: > > watch -n 60 ping -c 1 uniserve.com Effectively your telling it to KeepAlive. Is the router/modem going to sleep? Preston seems to think like me also I just read his reply to you. John