Has anyone ran into this issue before?  
 
2 physical nics: 
eth0 hooked up to 10.175.8.0/21
eth1 hooked up to 10.150.8.0/24
 
Ifconfig –a looks like this:
[root@mgixen1 ~]# ifconfig -a
eth0      Link encap:Ethernet 
HWaddr 00:19:B9:F2:1B:C3
          inet
addr:10.175.8.158  Bcast:10.175.15.255  Mask:255.255.248.0
          inet6
addr: fe80::219:b9ff:fef2:1bc3/64 Scope:Link
          UP
BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX
packets:1934 errors:0 dropped:0 overruns:0 frame:0
          TX
packets:1259 errors:0 dropped:0 overruns:0 carrier:0
         
collisions:0 txqueuelen:1000
          RX
bytes:168101 (164.1 KiB)  TX bytes:514285 (502.2 KiB)
         
Interrupt:16 Memory:f8000000-f8012100
 
eth1      Link encap:Ethernet 
HWaddr 00:19:B9:F2:1B:C5
          inet
addr:10.150.8.158  Bcast:10.150.8.255  Mask:255.255.255.0
          inet6
addr: fe80::219:b9ff:fef2:1bc5/64 Scope:Link
          UP
BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX
packets:746 errors:0 dropped:0 overruns:0 frame:0
          TX
packets:85 errors:0 dropped:0 overruns:0 carrier:0
         
collisions:0 txqueuelen:0
          RX
bytes:51903 (50.6 KiB)  TX bytes:13910 (13.5 KiB)
 
lo        Link
encap:Local Loopback
          inet
addr:127.0.0.1  Mask:255.0.0.0
          inet6
addr: ::1/128 Scope:Host
          UP
LOOPBACK RUNNING  MTU:16436  Metric:1
          RX
packets:8 errors:0 dropped:0 overruns:0 frame:0
          TX
packets:8 errors:0 dropped:0 overruns:0 carrier:0
         
collisions:0 txqueuelen:0
          RX
bytes:560 (560.0 b)  TX bytes:560 (560.0 b)
 
peth1     Link encap:Ethernet 
HWaddr FE:FF:FF:FF:FF:FF
          inet6
addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP
BROADCAST RUNNING NOARP  MTU:1500  Metric:1
          RX
packets:1786 errors:0 dropped:0 overruns:0 frame:0
          TX
packets:85 errors:0 dropped:0 overruns:0 carrier:0
         
collisions:0 txqueuelen:1000
          RX bytes:121447
(118.6 KiB)  TX bytes:14550 (14.2 KiB)
         
Interrupt:16 Memory:f4000000-f4012100
 
sit0      Link encap:IPv6-in-IPv4
         
NOARP  MTU:1480  Metric:1
          RX
packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX
packets:0 errors:0 dropped:0 overruns:0 carrier:0
         
collisions:0 txqueuelen:0
          RX
bytes:0 (0.0 b)  TX bytes:0 (0.0 b)
 
veth0     Link encap:Ethernet 
HWaddr 00:00:00:00:00:00
         
BROADCAST MULTICAST  MTU:1500  Metric:1
          RX
packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX
packets:0 errors:0 dropped:0 overruns:0 carrier:0
         
collisions:0 txqueuelen:0
          RX
bytes:0 (0.0 b)  TX bytes:0 (0.0 b)
 
veth2     Link encap:Ethernet 
HWaddr 00:00:00:00:00:00
         
BROADCAST MULTICAST  MTU:1500  Metric:1
          RX
packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX
packets:0 errors:0 dropped:0 overruns:0 carrier:0
         
collisions:0 txqueuelen:0
          RX
bytes:0 (0.0 b)  TX bytes:0 (0.0 b)
 
veth3     Link encap:Ethernet 
HWaddr 00:00:00:00:00:00
         
BROADCAST MULTICAST  MTU:1500  Metric:1
          RX
packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX
packets:0 errors:0 dropped:0 overruns:0 carrier:0
         
collisions:0 txqueuelen:0
          RX
bytes:0 (0.0 b)  TX bytes:0 (0.0 b)
 
veth4     Link encap:Ethernet 
HWaddr 00:00:00:00:00:00
         
BROADCAST MULTICAST  MTU:1500  Metric:1
          RX
packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX
packets:0 errors:0 dropped:0 overruns:0 carrier:0
         
collisions:0 txqueuelen:0
          RX
bytes:0 (0.0 b)  TX bytes:0 (0.0 b)
 
vif0.0    Link encap:Ethernet  HWaddr
FE:FF:FF:FF:FF:FF
         
BROADCAST MULTICAST  MTU:1500  Metric:1
          RX
packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX
packets:0 errors:0 dropped:0 overruns:0 carrier:0
         
collisions:0 txqueuelen:0
          RX
bytes:0 (0.0 b)  TX bytes:0 (0.0 b)
 
vif0.1    Link encap:Ethernet  HWaddr
FE:FF:FF:FF:FF:FF
          inet6
addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP
BROADCAST RUNNING NOARP  MTU:1500  Metric:1
          RX
packets:85 errors:0 dropped:0 overruns:0 frame:0
          TX
packets:746 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0
txqueuelen:0
          RX
bytes:13910 (13.5 KiB)  TX bytes:51903 (50.6 KiB)
 
vif0.2    Link encap:Ethernet  HWaddr
FE:FF:FF:FF:FF:FF
         
BROADCAST MULTICAST  MTU:1500  Metric:1
          RX
packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX
packets:0 errors:0 dropped:0 overruns:0 carrier:0
         
collisions:0 txqueuelen:0
          RX
bytes:0 (0.0 b)  TX bytes:0 (0.0 b)
 
vif0.3    Link encap:Ethernet  HWaddr
FE:FF:FF:FF:FF:FF
         
BROADCAST MULTICAST  MTU:1500  Metric:1
          RX
packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX
packets:0 errors:0 dropped:0 overruns:0 carrier:0
         
collisions:0 txqueuelen:0
          RX
bytes:0 (0.0 b)  TX bytes:0 (0.0 b)
 
vif0.4    Link encap:Ethernet  HWaddr
FE:FF:FF:FF:FF:FF
         
BROADCAST MULTICAST  MTU:1500  Metric:1
          RX
packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX
packets:0 errors:0 dropped:0 overruns:0 carrier:0
         
collisions:0 txqueuelen:0
          RX
bytes:0 (0.0 b)  TX bytes:0 (0.0 b)
 
virbr0    Link encap:Ethernet  HWaddr
00:00:00:00:00:00
          inet
addr:192.168.122.1  Bcast:192.168.122.255  Mask:255.255.255.0
          inet6
addr: fe80::200:ff:fe00:0/64 Scope:Link
          UP
BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX
packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX
packets:27 errors:0 dropped:0 overruns:0 carrier:0
         
collisions:0 txqueuelen:0
          RX
bytes:0 (0.0 b)  TX bytes:8254 (8.0 KiB)
 
xenbr1    Link encap:Ethernet  HWaddr
FE:FF:FF:FF:FF:FF
          UP
BROADCAST RUNNING NOARP  MTU:1500  Metric:1
          RX
packets:746 errors:0 dropped:0 overruns:0 frame:0
          TX
packets:0 errors:0 dropped:0 overruns:0 carrier:0
         
collisions:0 txqueuelen:0
          RX
bytes:49243 (48.0 KiB)  TX bytes:0 (0.0 b)
 
Network-bridge status:
[root@mgixen1 xen]# ./scripts/network-bridge status
============================================================
9: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500
qdisc noqueue
    link/ether 00:19:b9:f2:1b:c5 brd
ff:ff:ff:ff:ff:ff
    inet 10.150.8.158/24 brd 10.150.8.255
scope global eth1
    inet6 fe80::219:b9ff:fef2:1bc5/64 scope
link
       valid_lft forever
preferred_lft forever
16: xenbr1: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500
qdisc noqueue
    link/ether fe:ff:ff:ff:ff:ff brd
ff:ff:ff:ff:ff:ff
 
bridge name     bridge
id              
STP enabled     interfaces
virbr0         
8000.000000000000       yes
xenbr1         
8000.feffffffffff      
no              peth1
                                                       
vif0.1
 
10.150.8.0/24 dev eth1  proto kernel  scope
link  src 10.150.8.158
192.168.122.0/24 dev virbr0  proto kernel  scope
link  src 192.168.122.1
10.175.8.0/21 dev eth0  proto kernel  scope
link  src 10.175.8.158
169.254.0.0/16 dev eth1  scope link
default via 10.150.8.254 dev eth1
 
Kernel IP routing table
Destination    
Gateway        
Genmask         Flags Metric
Ref    Use Iface
10.150.8.0      0.0.0.0        
255.255.255.0   U    
0      0        0
eth1
192.168.122.0  
0.0.0.0        
255.255.255.0   U    
0      0        0
virbr0
10.175.8.0     
0.0.0.0        
255.255.248.0   U    
0      0        0
eth0
169.254.0.0    
0.0.0.0         255.255.0.0    
U     0     
0        0 eth1
0.0.0.0        
10.150.8.254   
0.0.0.0         UG   
0      0        0
eth1
 
 
This is with no guests running:
After starting a guest:
 
[root@mgixen1 xen]# brctl show
bridge name     bridge
id              
STP enabled     interfaces
virbr0         
8000.000000000000       yes
xenbr1         
8000.feffffffffff            no
                   vif1.0
                                            
peth1
                                                       
                                     vif0.1
 
Can anyone help shed some light?
 
 
 
Jamie Duncan
Internet Systems Administrator
Media General
 
work- 804.649.6037
cell- 804.212.6759