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[HyperV Replica :: http://technet.microsoft.com/en-us/library/jj134172.aspx]
[Guest IP Injection :: http://blogs.technet.com/b/virtualization/archive/2012/05/29/inject-ip-address-into-the-vm-during-failover.aspx]

After failover only the Injected IP settings of the last interface is
retained inside /etc/network/interfaces

Repro Steps:

1) Create Ubuntu 13.10 virtual machine.
 
2) Enable Replication.
 
3) Attach two network adapters on recovery.
'Network Adapter' and 'Adapter2'
 
4) Assign Failover IP settings to both these adapters.
 
Set-VMNetworkAdapterFailoverConfiguration -ComputerName $computerName -VMName $vmname -IPv4Address 192.168.100.10 -IPv4SubnetMask 255.255.0.0 -IPv4PreferredDNSServer 192.168.100.101 -IPv4AlternateDNSServer 192.168.100.102 -IPv4DefaultGateway 192.168.100.1 -VMNetworkAdapterName 'Network Adapter'
 
Set-VMNetworkAdapterFailoverConfiguration -ComputerName $computerName -VMName $vmname -IPv4Address 192.168.100.20 -IPv4SubnetMask 255.255.255.0 -IPv4PreferredDNSServer 192.168.100.201 -IPv4AlternateDNSServer 192.168.100.202 -IPv4DefaultGateway 192.168.100.2 -VMNetworkAdapterName 'Adapter2'
 
5) Do Failover.
 
Check contents of eth0
 
cat /var/lib/hyperv/ifcfg-eth0
HWADDR=00:15:5D:38:4E:30
DEVICE=eth0
BOOTPROTO=none
IPADDR0=192.168.100.10
NETMASK0=255.255.0.0
GATEWAY=192.168.100.1
DNS1=192.168.100.101
DNS2=192.168.100.102
 
Check contents of eth1
 
# cat /var/lib/hyperv/ifcfg-eth1
HWADDR=00:15:5D:38:4E:31
DEVICE=eth1
BOOTPROTO=none
IPADDR0=192.168.100.20
NETMASK0=255.255.255.0
GATEWAY=192.168.100.2
DNS1=192.168.100.201
DNS2=192.168.100.202
 
6) Look into contents of /etc/network/interfaces
# cat /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback network interface
auto lo
iface lo inet loopback
# The primary network interface
auto eth0
# The following stanza(s) added by hv_set_ifconfig
auto eth1
iface eth1 inet static
        address 192.168.100.20
        netmask 255.255.255.0
        gateway 192.168.100.2
        dns-nameservers 192.168.100.201 192.168.100.202
#End of hv_set_ifconfig stanzas
 
7) Only IP settings for the last interface i.e., eth1 in our case are intact.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: saucy
-- 
hyper-v: IP Injection setting are not correctly populated inside Ubuntu 13.10 guest during Failover and Test Failover when using more than one interfaces for IP Injection
https://bugs.launchpad.net/bugs/1311071
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