vSphere Replication shows as Disconnected in Site Recovery UI when eth1 is configured for replication traffic

Products

• VMware Live Recovery

Issue/Introduction

Symptoms:

• Multiple replications are reported as Not Active.
  The VRMS shows as Disconnected in the Site Recovery UI.

• A dedicated replication network (eth1) is configured and in use.
• DNS lookups fail, further indicating communication issues on the management network.

 

Environment

• vSphere Replication 8.x
• vSphere Replication 9.x

Cause

• The issue occurs because the replication network (eth1) is set as the default gateway instead of the management network (eth0 with Metric=1000). This causes the management network to stop working, making the Site Recovery UI inaccessible and the replications appear disconnected.
• The routing table confirms the misconfiguration:

admin@vr [ ~ ]$ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         _gateway        0.0.0.0         UG    0      0        0 eth1
default         _gateway        0.0.0.0         UG    1000   0        0 eth0

Resolution

1. Edit the network configuration for eth0

   •  vi /etc/systemd/network/10-eth0.network

   • Remove the Metric line so eth0 can act as the default gateway.

2. Edit the network configuration for eth1

   • vi /etc/systemd/network/10-eth1.network

   • Under the [Route] section, add:
     
     Metric=1000

3. Apply the changes

   • Restart systemd-networkd service or reboot the replication appliance.

# systemctl restart systemd-networkd