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  2. Bug #1853592
  3. Comment #16

Comment 16 for bug 1853592

Revision history for this message
James Page (james-page) wrote : Re: hw-tc-offload not reliable with VXLAN

Further Debugging:

tcpdump on representator port for a VM:

12:09:41.933101 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from fa:16:3e:2d:b5:eb (oui Unknown), length 297
12:09:41.939887 IP6 :: > ff02::16: HBH ICMP6, multicast listener report v2, 1 group record(s), length 28
12:09:42.042338 IP 172.16.0.2.bootps > 172.16.3.231.bootpc: BOOTP/DHCP, Reply, length 328
12:09:42.042673 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from fa:16:3e:2d:b5:eb (oui Unknown), length 309
12:09:42.155942 IP6 :: > ff02::1:ff2d:b5eb: ICMP6, neighbor solicitation, who has fe80::f816:3eff:fe2d:b5eb, length 32
12:09:42.207925 IP6 :: > ff02::16: HBH ICMP6, multicast listener report v2, 1 group record(s), length 28
12:09:43.167942 IP6 fe80::f816:3eff:fe2d:b5eb > ff02::16: HBH ICMP6, multicast listener report v2, 1 group record(s), length 28
12:09:43.170786 IP6 fe80::f816:3eff:fe2d:b5eb > ip6-allrouters: ICMP6, router solicitation, length 16
12:09:43.202982 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from fa:16:3e:2d:b5:eb (oui Unknown), length 309
12:09:43.679928 IP6 fe80::f816:3eff:fe2d:b5eb > ff02::16: HBH ICMP6, multicast listener report v2, 1 group record(s), length 28
12:09:46.934638 IP6 fe80::f816:3eff:fe2d:b5eb > ip6-allrouters: ICMP6, router solicitation, length 16
12:09:47.575319 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from fa:16:3e:2d:b5:eb (oui Unknown), length 309

REQUEST/REPLY is seen - however the REPLY must never get to the VM.

As the REPLY is unicast, that gets pushed to an offloaded flow rule so subsequent REPLY packets would not been seen on the hypervisor.