[Xen-users] Networking with a subnet

[Kristofer <kristofer@xxxxxxxxxxxxxx>]

I have been trying for a couple days to try to get this to work, and  
I'm stumped.  I've seen wiki's on how people do it, but I must  
completely be missing something.
My provider gives me two network connections:

eth0: private
eth1: public

My eth1 interface has a /29, and I am also getting an additional /29  
routed to me (so they are routing it to the IP address that is set on  
my eth1 interface).  So I have two /29's, one which is currently bound  
to eth1 (subnet A), and one which is just routed to me and not bound  
(subnet B).  I only want to use one of these /29's for domU's.. the  
one that is being routed to me (subnet B)
I want to bridge subnet B with my Xen domU's.  I took one IP from  
subnet B and assigned it to "dummy0", and I can ping it from the  
outside world, bind to it and make connections outbound, and all is  
well.
However, I cannot get DomU's to communicate with anything (not even  
the dom0) if they use an IP address from subnet B.
"brctl status" shows that xenbr1 is connected to vif0.1 and pdummy,  
and that vif1.0 is also bound to it.
bridge name     bridge id               STP enabled     interfaces
virbr0          8000.000000000000       yes
xenbr1          8000.feffffffffff       no              vif1.0
                                                        pdummy0
                                                        vif0.1

Now, given that I am trying to do a network install of CentOS on the  
guest, I can't actually get into the shell and do an "ifconfig" or a  
"tcpdump" as I don't have any domU's that are created that I can  
attach to a console, so my troubleshooting is limited to the dom0 side.
I've check iptables, and nothing is set to be dropped/rejected.

xenbr1    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
          RX packets:60 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:10140 (9.9 KiB)  TX bytes:0 (0.0 b)

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:7 errors:0 dropped:0 overruns:0 frame:0
          TX packets:24 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:32
          RX bytes:412 (412.0 b)  TX bytes:1008 (1008.0 b)

pdummy0   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:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:26 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 b)  TX bytes:9276 (9.0 KiB)

dummy0    Link encap:Ethernet  HWaddr B6:CE:E7:E8:3E:9C
          inet addr:208.x.x.x  Bcast:208.x.x.x  Mask:255.255.255.248
          inet6 addr: fe80::b4ce:e7ff:fee8:3e9c/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:29 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 b)  TX bytes:9462 (9.2 KiB)

tcpdump's are not showing any traffic on xenbr1, vif1.0, pdummy0, or  
dummy0.  I'm not even sure if tcpdump will show anything on interfaces  
like that.  I am also showing nothing on eth1 for anything coming from  
this domU I am trying to install.
I'm at a loss?


Kristofer


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