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 PAMAS Partikelmess- und Analysesysteme GmbH Dieselstr.10, D-71277 Rutesheim Tel +49-7152-99630 Fax +49-7152-996333 Geschäftsführer: Gerhard Schreck Handelsregister B Stuttgart HRB 252024