Details

router peering details 1555x888

When VM 10.0.0.3 in Site A sends an IP packet to VM 10.0.1.3 in Site B, the packet appears as follows when it egresses SiteAGatewayDevice:

  • Outer Ethernet header: src is MAC of 200.200.0.1, dst is MAC of SiteAVtepRouter’s peer
  • Outer IP header: src is 200.200.0.1, dst is 200.200.0.2, proto is UDP
  • UDP header: src is hash of inner packet, dst is standard VXLAN port
  • VXLAN header: VNI is 100
  • Inner Ethernet header:

    • src is 16:B7:B5:A4:57:75 (MAC of SiteATenantRouter on SiteAMultiSiteNetwork)
    • dst is 6F:E4:5A:FA:8E:09 (MAC of SiteBTenantRouter on SiteBMultiSiteNetwork)
  • Inner IP header: src is 10.0.0.3, dst is 10.0.1.3

Note that SiteATenantRouter’s and SiteBTenantRouter’s IP addresses do not appear in the packet because they are just intermediate routers. However, traceroute from VM 10.0.0.3 to 10.0.1.3 should find these hops:

  • 10.0.0.1
  • 192.168.0.1
  • 192.168.0.2
  • 10.0.1.1
  • 10.0.1.3

Traceroute will not detect SiteAVtepRouter or SiteBVtepRouter, which are part of the tunneling infrastructure.

Questions? Discuss on Mailing Lists or Chat.
Found an error? Report a bug.


loading table of contents...