Hello, Are your netmask config Ok? Can you use wireshark to sniff traffic in the middle LANCOM <->Wireshark/tcpdump<->Xenserver and send me a trace? Best Regards, Juan Carlos Díaz Fernández IGN Solutions™ Director Técnico mailto: juan.carlos.diaz at ign-solutions.com callto: +34638295207/+34617413903 Innova Galicia Networks Solutions SL http://www.ign-solutions.com Pazo de Feiras e Congresos de Lugo - Palomar s/n 27004 LUGO - Spain callto: +34982284150 faxto: +34982284922 2010/3/5 Michael Schumacher <michael.schumacher at pamas.de> > > Nobody having an idea? > > > Hi, > > I am trying to fix a problem I have for about a week now. > > The environment is: > > --several independent servers with Centos5.4 on the latest patchlevel > > (example will be server2) All of them are working properly. > > --a machine with Xen installed to host some virtual machines > > (xenserver1) > > --domu servers on xenserver1 (crmserver1, winserver1) > > > The whole network is connected with a Lancom router to a DSL line. > > > Some days ago I noticed that server2 was updated properly, but > > xenserver1, crmserver1 and winserver were not updating the OS > > properly. They seemed to be cut off the internet. I can ping from all > > to all servers internally, I can ssh from all to all servers > > internally and I can browse the Internet from server2 successfully > > (using IP-numbers and hostnames), but xenserver1 and its domu clients > > could not connect to the internet. I checked the firewalls on > > xenserver, and crmserver1. They seemed to be OK and stopping them with > > "etc/init.d/iptables stop" didn't solve the problem. > > > I can resolve hostnames: > > >>[root at xenserver1 ~]# nslookup www.centos.org > >>Server: 192.168.1.1 > >>Address: 192.168.1.1#53 > >> > >>Non-authoritative answer: > >>Name: www.centos.org > >>Address: 72.232.194.162 > > > but I cannot browse neither to "elinks http://www.centos.org" nor to > > 72.232.194.162, however, I can ping www.centos.org successfully. > > > > the network routes seem to be OK : > > >>[root at xenserver1 ~]# route > >>Kernel IP routing table > >>Destination Gateway Genmask Flags Metric Ref Use > Iface > >>10.1.1.0 * 255.255.255.0 U 0 0 0 > eth1 > >>192.168.122.0 * 255.255.255.0 U 0 0 0 > virbr0 > >>169.254.0.0 * 255.255.0.0 U 0 0 0 > eth0 > >>192.168.0.0 * 255.255.0.0 U 0 0 0 > eth0 > >>default LANCOM_1751_1.p 0.0.0.0 UG 0 0 0 > eth0 > > > (eth1 is a drbd interface) > > >> [root at crmserver1 ~]# route > >> Kernel IP routing table > >> Destination Gateway Genmask Flags Metric Ref Use > Iface > >> 169.254.0.0 * 255.255.0.0 U 0 0 0 > eth0 > >> 192.168.0.0 * 255.255.0.0 U 0 0 0 > eth0 > >> default LANCOM_1751_1.p 0.0.0.0 UG 0 0 0 > eth0 > > > > > Has anybody any clue where to look? > > best regards > --- > Michael Schumacher > > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20100305/647c4f43/attachment-0005.html>