topic Re: Syslog and DNS on VM--&gt; UDP traffic flood concerns? in Enterprise Strategy & Planning Discussions https://communities.vmware.com/t5/Enterprise-Strategy-Planning/Syslog-and-DNS-on-VM-gt-UDP-traffic-flood-concerns/m-p/1568584#M24504 <HTML><HEAD></HEAD><BODY><P>To answer your questions from my experience </P><P></P><P>A) No</P><P>B) No </P><P>C) No. However if your syslog is getting a lot of UDP packets you may want to disable that VM from VMotion, as you may loose a few packets as the networking switches. If its tcp that there will not be loss.</P><P></P><P>Should be easy for you to setup some load tests for your environment, which is the only way you are going to be sure.</P><P></P><P><SPAN __default_attr="10px" __jive_macro_name="size"><SPAN __default_attr="gray" __jive_macro_name="color">Considering awarding points if this is of use</SPAN></SPAN></P></BODY></HTML> Wed, 26 Mar 2008 04:27:41 GMT Rodos 2008-03-26T04:27:41Z Syslog and DNS on VM--> UDP traffic flood concerns? https://communities.vmware.com/t5/Enterprise-Strategy-Planning/Syslog-and-DNS-on-VM-gt-UDP-traffic-flood-concerns/m-p/1568583#M24503 <HTML><HEAD></HEAD><BODY><P>We are considering converting several physical edge services boxes running DNS and Syslog, from physical to virtual machines. Someone raised a concern regarding the expected volume of small network packets, likely around 1500 (mostly UDP) packets per second. We're on a gig network. </P><P></P><P>I've had a number of vendors steer us away from virtuals in the past due to a high volume of network chatter. HP SIM, for example,monitors thousands of servers via SNMP and the vendor will not certify on VM due to potential network congestion. </P><P></P><P>My questions are: </P><P>A) Is there reason to be concerned with provisioning Syslog/DNS on a virtual, knowing that I'll get ~1500 packets/second?</P><P>B) Is there a 'rule of thumb' or guideline for "acceptable" volume of small network packets on a VM?</P><P>B) Are there any other "gotchas" running Syslog or DNS on a 3.5x VM that anyone is aware of?</P><P></P><P>Thanks in advance for your assistance!</P></BODY></HTML> Mon, 24 Mar 2008 19:46:37 GMT https://communities.vmware.com/t5/Enterprise-Strategy-Planning/Syslog-and-DNS-on-VM-gt-UDP-traffic-flood-concerns/m-p/1568583#M24503 martinrb 2008-03-24T19:46:37Z Re: Syslog and DNS on VM--> UDP traffic flood concerns? https://communities.vmware.com/t5/Enterprise-Strategy-Planning/Syslog-and-DNS-on-VM-gt-UDP-traffic-flood-concerns/m-p/1568584#M24504 <HTML><HEAD></HEAD><BODY><P>To answer your questions from my experience </P><P></P><P>A) No</P><P>B) No </P><P>C) No. However if your syslog is getting a lot of UDP packets you may want to disable that VM from VMotion, as you may loose a few packets as the networking switches. If its tcp that there will not be loss.</P><P></P><P>Should be easy for you to setup some load tests for your environment, which is the only way you are going to be sure.</P><P></P><P><SPAN __default_attr="10px" __jive_macro_name="size"><SPAN __default_attr="gray" __jive_macro_name="color">Considering awarding points if this is of use</SPAN></SPAN></P></BODY></HTML> Wed, 26 Mar 2008 04:27:41 GMT https://communities.vmware.com/t5/Enterprise-Strategy-Planning/Syslog-and-DNS-on-VM-gt-UDP-traffic-flood-concerns/m-p/1568584#M24504 Rodos 2008-03-26T04:27:41Z Re: Syslog and DNS on VM--> UDP traffic flood concerns? https://communities.vmware.com/t5/Enterprise-Strategy-Planning/Syslog-and-DNS-on-VM-gt-UDP-traffic-flood-concerns/m-p/1568585#M24505 <HTML><HEAD></HEAD><BODY><P>I wouldn't see any problems virtualizing the Syslogs and DNS servers even VMware has paper regarding DNS server under ESX. <A href="http://www.vmware.com/pdf/file_print_dns_wp.pdf"></A></P><P></P><P>If you found this information useful, please consider awarding points for "Correct" or "Helpful". Thanks!!! </P><P></P><P>Regards,</P><P></P><P>Stefan Nguyen</P><P>iGeek Systems LLC.</P><P>VMware, Citrix, Microsoft Consultant</P></BODY></HTML> Wed, 26 Mar 2008 17:13:24 GMT https://communities.vmware.com/t5/Enterprise-Strategy-Planning/Syslog-and-DNS-on-VM-gt-UDP-traffic-flood-concerns/m-p/1568585#M24505 azn2kew 2008-03-26T17:13:24Z