After the reboot to 7.1.0 I couldn't reach the GUI and pings were not responding.
I went into the console, modified the /boot/config/network.cfg, changed the BRNICS[0] back to eth1, and rebooted unraid server again. Once it booted back up, it restored network functionally, and I was able to connect to the GUI.
After the upgrade(non working config):
# Generated settings:
IFNAME[0]="br0"
BRNAME[0]="br0"
BRSTP[0]="no"
BRFD[0]="0"
DESCRIPTION[0]="MGMT"
BRNICS[0]="eth0"
PROTOCOL[0]="ipv4"
USE_DHCP[0]="no"
IPADDR[0]="10.0.0.30"
NETMASK[0]="255.255.255.0"
GATEWAY[0]="10.0.0.1"
DNS_SERVER1="8.8.8.8"
DNS_SERVER2="8.8.4.4"
USE_DHCP6[0]="no"
DHCP6_KEEPRESOLV="no"
MTU[0]="1500"
SYSNICS="1"
The fix:
# Generated settings:
IFNAME[0]="br0"
BRNAME[0]="br0"
BRSTP[0]="no"
BRFD[0]="0"
DESCRIPTION[0]="MGMT"
BRNICS[0]="eth1"
PROTOCOL[0]="ipv4"
USE_DHCP[0]="no"
IPADDR[0]="10.0.0.30"
NETMASK[0]="255.255.255.0"
GATEWAY[0]="10.0.0.1"
DNS_SERVER1="8.8.8.8"
DNS_SERVER2="8.8.4.4"
USE_DHCP6[0]="no"
DHCP6_KEEPRESOLV="no"
MTU[0]="1500"
SYSNICS="1"