[Xen-users] Guest VM dropping connection.

["Ubaidul Khan" <ukhanlists@xxxxxxxxxxx>]

I am running RHEL5 Guest and Host.  The guest OS is dropping network 
connections occasionally(I noticed my ssh session suddenly terminated).  The 
guest is configured with private network interface and a public network 
interface.  Following are the bridge/network settings for the host:
bridge name     bridge id               STP enabled     interfaces
xenbr0          8000.feffffffffff              no                 vif2.0
                                                                            
vif1.0
                                                                            
peth0
                                                                            
vif0.0
xenbr1          8000.fefffffffffe             no                 vif2.1
                                                                            
peth1
                                                                            
vif0.3
xenbr1 is dedicated to provide the private network link for the guest os.  
Following is the guest OS configuration:
# Automatically generated xen config file
name = "saleen_webvm0"
memory = "1000"
disk = [ 
'tap:aio:/vms/img/redhat/linux/es/5.0/x86_64/saleen_webvm0.img,xvda,w','phy:/dev/sdc,xvdb,w' 
]
vif = [ 'mac=00:16:3e:2e:6f:e1, bridge=xenbr0','mac=00:16:3e:2f:9e:b1, 
bridge=xenbr1',]
# vif = [ 'mac=00:16:3e:2e:6f:e1, bridge=xenbr0',]
vfb = ["type=vnc,vncunused=1"]
uuid = "122374dc-26a3-cb0d-99f8-3393e2481777"
bootloader="/usr/bin/pygrub"
vcpus=2
on_reboot   = 'restart'
on_crash    = 'restart'

Following is the output of ifconfig:

eth0      Link encap:Ethernet  HWaddr 00:14:4F:40:D8:70
         inet addr:xxx.xxx.xxx.xxx  Bcast:xxx.xxx.xxx.255  
Mask:255.255.255.0
         inet6 addr: fe80::214:4fff:fe40:d870/64 Scope:Link
         UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
         RX packets:79313 errors:0 dropped:0 overruns:0 frame:0
         TX packets:1167 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:0
         RX bytes:6619719 (6.3 MiB)  TX bytes:115448 (112.7 KiB)

eth1      Link encap:Ethernet  HWaddr 00:14:4F:40:D8:71
         inet addr:xxx.xxx.xxx.xxx  Bcast:xxx.xxx.xxx.255  
Mask:255.255.255.0
         inet6 addr: fe80::214:4fff:fe40:d871/64 Scope:Link
         UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
         RX packets:0 errors:0 dropped:0 overruns:0 frame:0
         TX packets:12 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:0
         RX bytes:0 (0.0 b)  TX bytes:720 (720.0 b)

peth0     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:105404 errors:0 dropped:0 overruns:0 frame:0
         TX packets:13455 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:1000
         RX bytes:9122426 (8.6 MiB)  TX bytes:1997833 (1.9 MiB)
         Base address:0x8c00 Memory:fa5e0000-fa600000

peth1     Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FE
         inet6 addr: fe80::fcff:ffff:feff:fffe/64 Scope:Link
         UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
         RX packets:9239102 errors:0 dropped:0 overruns:0 frame:0
         TX packets:5337342 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:1000
         RX bytes:12420212276 (11.5 GiB)  TX bytes:523849820 (499.5 MiB)
         Base address:0x8800 Memory:fa5c0000-fa5e0000

vif1.0    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:2174 errors:0 dropped:0 overruns:0 frame:0
         TX packets:80032 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:32
         RX bytes:446031 (435.5 KiB)  TX bytes:6941997 (6.6 MiB)

vif2.0    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:10084 errors:0 dropped:0 overruns:0 frame:0
         TX packets:89284 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:32
         RX bytes:1186096 (1.1 MiB)  TX bytes:7380350 (7.0 MiB)

vif2.1    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:5337343 errors:0 dropped:0 overruns:0 frame:0
         TX packets:9239082 errors:0 dropped:20 overruns:0 carrier:0
         collisions:0 txqueuelen:32
         RX bytes:403712612 (385.0 MiB)  TX bytes:12383227754 (11.5 GiB)

Any help is greately appreciated.

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