I am having a strange networking issue between pool members.. I have a xenserver 7 pool with a few networks. Currently all of my VMs are running on xen1.
I noticed today that VMs running on xen2 cannot communicate with other VMs on xen1. After further investigation I found that this issue only effects one specific VLAN. All other networks function without issue between pool members.
The gateway for all networks is a VM running on xen1.
Testing from a VM on xen2 I can see ARP broadcasts destined for its gateway on the troublesome VLAN leaving the host > ingress and egress xen2 > ingress xen1 but never egress > nothing hits the firewall VM on xen1..
The same is true in reverse ARP broadcasts from the firewall VM on xen1 leave the host > ingress and egress xen1 > ingress xen2 but never egress > nothing hits the VM on xen2..
What's odd is communication for all other networks between pool members seem to work without issue.
Can someone please help me with this situation?
Please let me know if you'd like more information.