Bug 675283

Description of problem:
I used two interfaces for child vm eth0 and eth1 using interface type =
ethernet, eth0 is working fine but eth1 is not working.


Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
1. Start child VM for 2 interfaces supporting using interface type = ethernet

-net nic,macaddr=xxx:fe,vlan=0,name=nic0 -net
tap,ifname=tap1,script=/KVM/vm-tap1.sh,vlan=0,name=tap1 -net
nic,macaddr=xxx,vlan=1,name=nic1 -net
tap,ifname=tap2,script=/KVM/vm-tap2.sh,vlan=1,name=tap2 

Above script create tap interface and add desire ip route automatically, i
mention the detail of script in Additional info section.

2. On child up the eth1 and ping from kvm host , its not pinging/responding. 
  
Actual results:

when try to ping eth1 from kvm host, its gives destination unreachable, as eth0
is pinging . tcpdump on eth1 guest and arp results on kvm host shows below.

tcpdump on eth1

17:05:55.213100 ARP, Request who-has 22.22.22.22 tell x.x.x.x, length 46
17:05:56.213493 ARP, Request who-has 22.22.22.22 tell x.x.x.xlength 46

Arp -e results on kvm host

Address HWtype HWaddress Flags Mask Iface
x.x.x.x ether 52:54:00:56:40:56 C tap1 --> ok for eth0
x.x.x.x (incomplete) tap2 --> problem for eth1


Expected results:

eth1 should be ping and accessible from kvm host and from outer world.

Additional info:

Above Network script use below 

#!/bin/bash                                      

IP= x.x.x.x # (ip of eth1)
TAP=tap2       
SIP=x.x.x.x # (ip of kvm host)

tap=`ifconfig |grep $TAP`                 
if [ "$tap" == '' ] ;then                 
tap=`tunctl -b -u root -t $TAP`           
fi                                        
ifconfig $TAP $SIP netmask 255.255.255.255 up
echo 1 > /proc/sys/net/ipv4/conf/$TAP/proxy_arp
route=`ip route show |grep $IP`                
if [ "$route" == '' ] ;then                    
ip route add $IP/32 dev $TAP                   
fi                                 

Same above all is working for eth0 , but eth1 is not working/responding. I sure
if same is working for eth0 then it must be working for eth1, but it cant work

Kindly suggest please.

Thanks
Muzi