VMkernel ports are used for system traffic for vMotion, IP storage, Fault Tolerance, vSAN, and others. Ensuring inter-connectivity between your hosts on each of these interfaces is an integral requirement for HA Clusters. <\/p>\n
Communication issues can occur for a number of reasons, but in my experience it is usually due to a misconfiguration of the IP details, the switch configuration or the assigned physcial adapter. Testing that your hosts can communicate with eachother is obviously essential before you should put a host into production. To do this we can use the Jumbo Frames on some switches are configured at either 8994 or 9000. This usually depends on wether the switch is including the headers in this setting or not. If a test with 8994 works but 9000 does not, this is still confirmation that Jumbo Frames configuration is working. <\/p>\n","protected":false},"excerpt":{"rendered":" VMkernel ports are used for system traffic for vMotion, IP storage, Fault Tolerance, vSAN, and others. Ensuring inter-connectivity between your hosts on each of these interfaces is an integral requirement for HA Clusters. Communication issues can occur for a number of reasons, but in my experience it is usually due to a misconfiguration of the […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[21,20],"tags":[27,28],"_links":{"self":[{"href":"https:\/\/www.soutarsit.co.uk\/index.php\/wp-json\/wp\/v2\/posts\/337"}],"collection":[{"href":"https:\/\/www.soutarsit.co.uk\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.soutarsit.co.uk\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.soutarsit.co.uk\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.soutarsit.co.uk\/index.php\/wp-json\/wp\/v2\/comments?post=337"}],"version-history":[{"count":5,"href":"https:\/\/www.soutarsit.co.uk\/index.php\/wp-json\/wp\/v2\/posts\/337\/revisions"}],"predecessor-version":[{"id":454,"href":"https:\/\/www.soutarsit.co.uk\/index.php\/wp-json\/wp\/v2\/posts\/337\/revisions\/454"}],"wp:attachment":[{"href":"https:\/\/www.soutarsit.co.uk\/index.php\/wp-json\/wp\/v2\/media?parent=337"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.soutarsit.co.uk\/index.php\/wp-json\/wp\/v2\/categories?post=337"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.soutarsit.co.uk\/index.php\/wp-json\/wp\/v2\/tags?post=337"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}vmkping<\/code> command. This allows us to specify a VMkernel interface to ping from and usefully lets us set the packet size so that we can ensure correct end-to-end configuration of Jumbo frames<\/p>\n\r\nvmkping [args] [host]\r\nargs:\r\n-4 use IPv4 (default)\r\n-6 use IPv6\r\n-c set packet count\r\n-d set DF bit (IPv4) or disable fragmentation (IPv6)\r\n-D vmkernel TCP stack debug mode\r\n-i set interval (secs)\r\n-I outgoing interface - for IPv6 scope or IPv4\r\n bypasses routing lookup\r\n-N set IP*_NEXTHOP - bypasses routing lookup\r\n for IPv4, -I option is required\r\n-s set the number of ICMP data bytes to be sent.\r\n The default is 56, which translates to a 64 byte\r\n ICMP frame when added to the 8 byte ICMP header.\r\n (Note: these sizes does not include the IP header).\r\n-t set IPv4 Time To Live or IPv6 Hop Limit\r\n-v verbose\r\n-W set timeout to wait if no responses are\r\n received (secs)\r\n\r\n-X XML output format for esxcli framework.\r\n-S The network stack instance name. If unspecified\r\n the default netstack instance is used.\r\n\r\nNOTE: In vmkernel TCP debug mode, vmkping traverses\r\nVSI and pings various configured addresses.<\/pre>\n
vmkping -I vmk# 10.10.10.# -s 8994<\/pre>\n