[Xen-users] Xen domains not replying to arp requests

[Digvijoy Chatterjee <digvijoy_chatterjee@xxxxxxxxxxx>]

Hi List,

I am running FC4-2.6.11-1.1369_Xen0 as my Dom-0 and FC4-2.6.11-1.1369XenU as my domains and Xen shipped with Fedora

this is how the picture is :
[root@Aarya ~]# xm list
Name              Id  Mem(MB)  CPU  State  Time(s)  Console
Cluster-1          3      255        1      -b---     43.1        9603
Cluster-2          4      255        1      -b---     41.5        9604
Domain-0        0       256        0      r----    155.4        

now my Domain-0 has two network cards , i am intending to setup a virtual private network in this way 

                Dom-0 eth0(172.25.243.133/27)----connected to outside world( bcast 172.25.243.159)
                          /|\
                           | (echo 1>> /proc/sys/net/ipv4_forward ) 
                Dom-0 eth1(10.10.1.1/24)(bcast 10.10.1.255) 
                            |\
                            |  \
                            |    \
                            |     Cluster-2 eth0(10.10.1.3/24) ,bcast 10.10.1.255 , 
                            |        
                      Cluster-1 eth0(10.10.1.2/24) ,bcast 10.10.1.255

ping from Cluster-1 to Cluster-2 to vice versa is working , but i am not able to ping from the Dom-0 eth1 to Cluster-1/Cluster-2 or  the other way,..
tcpdump output says the xen domains are not able to give arp replies for requests as you can see below . for example 
      
[root@Cluster-1 ~]# ping 10.10.1.1                ( hangs forever , 100% packet lost on interrupting)
PING 10.10.1.1 (10.10.1.1) 56(84) bytes of data.

[root@Aarya ~]# tcpdump -i eth1 |grep '10.10.1.2'
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth2, link-type EN10MB (Ethernet), capture size 96 bytes
12:57:06.682653 arp who-has 10.10.1.2 tell 10.10.1.1
12:57:08.682647 arp who-has 10.10.1.2 tell 10.10.1.1
12:57:09.682647 arp who-has 10.10.1.2 tell 10.10.1.1
12:57:10.682648 arp who-has 10.10.1.2 tell 10.10.1.1
12:57:12.682647 arp who-has 10.10.1.2 tell 10.10.1.1
12:57:13.682648 arp who-has 10.10.1.2 tell 10.10.1.1
12:57:14.682659 arp who-has 10.10.1.2 tell 10.10.1.1

My Dom-0 ifconfig output is like this 
[root@Aarya ~]# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:0E:0C:5E:AE:AB  
          inet addr:172.25.243.133  Bcast:172.25.243.159  Mask:255.255.255.224
          inet6 addr: fe80::20e:cff:fe5e:aeab/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:265697 errors:5 dropped:0 overruns:0 frame:5
          TX packets:220098 errors:0 dropped:0 overruns:0 carrier:0
          collisions:101248 txqueuelen:1000 
          RX bytes:362665597 (345.8 MiB)  TX bytes:33895510 (32.3 MiB)

eth1      Link encap:Ethernet  HWaddr 00:C0:9F:47:1A:6B  
          inet addr:10.10.1.1  Bcast:10.10.1.255  Mask:255.255.255.0
          inet6 addr: fe80::2c0:9fff:fe47:1a6b/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:316967 errors:10 dropped:0 overruns:0 frame:10
          TX packets:723 errors:4 dropped:0 overruns:0 carrier:4
          collisions:553 txqueuelen:1000 
          RX bytes:289280232 (275.8 MiB)  TX bytes:48548 (47.4 KiB)
          Base address:0xece0 Memory:fe2e0000-fe300000 

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:18715 errors:0 dropped:0 overruns:0 frame:0
          TX packets:18715 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:5463365 (5.2 MiB)  TX bytes:5463365 (5.2 MiB)

vif3.0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF  
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:488 errors:0 dropped:0 overruns:0 frame:0
          TX packets:113 errors:0 dropped:5 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:46202 (45.1 KiB)  TX bytes:9648 (9.4 KiB)

vif4.0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF  
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:573 errors:0 dropped:0 overruns:0 frame:0
          TX packets:101 errors:0 dropped:5 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:54616 (53.3 KiB)  TX bytes:8444 (8.2 KiB)

xen-br0   Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF  
          inet addr:172.25.243.133  Bcast:172.25.243.159  Mask:255.255.255.255
          inet6 addr: fe80::200:ff:fe00:0/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:919 errors:0 dropped:0 overruns:0 frame:0
         TX packets:34 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:74613 (72.8 KiB)  TX bytes:1596 (1.5 KiB)

Can anyone help as to why the domains are not giving arp replies or how best to set up my network

TIA
Digz

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