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xen-users
Re: [Xen-users] Networking with a subnet
Well I feel completely stupid. After a few days of messing with
this.... I shouldn't even admit how dumb this was.
I have a /29.. I was using .240 on the dummy0 interface on dom0.. Uhh,
yeah.. I can't do math and realize that .240 was the network
address. :-\
Oops. Setting dummy0 to .241, which is the correct first address of
the subnet, and things are now routing.
*sigh*
On Jul 28, 2008, at 8:23 PM, Kristofer wrote:
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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