Re: [Xen-users] Xen 3.1 networking questions

[Florian Engelmann <mailinglists@xxxxxxxx>]

Also NAT and HVM seems to be broken/not working:
http://www.nabble.com/Re%3A-nat-does-not-work-with-hvm-tf3645589.html#a10181512

So no chance to start a windows HVM on my root server :(

Florian Engelmann schrieb:
> Ok at the moment I use NAT and i can connect to the internet, but I 
> always have to change the router. Xen starts a new vifx.0 interface 
> which is my domUs router. The IP changes every time. How to fix that???
> here are my configs:
> xend-config.sxp (dhcp does not work anyway):
> (network-script 'network-nat dhcp=yes')
> (vif-script vif-nat)
>
> domU.cfg:
> vif  = [ 'ip=10.0.0.100' ]
> ip = '10.0.0.100'
> netmask = '255.0.0.0'
> gateway = '10.0.0.1'
>
> /etc/network/interfaces
> auto eth0
> #iface eth0 inet dhcp
> iface eth0 inet static
> address 10.0.0.100
> #gateway 10.0.0.254
> netmask 255.0.0.0
>
>
> the gateway is then set by xen to 10.0.0.1 but i have to change it with:
> route del default gw 10.0.0.1
> and
> route add default gw 10.0.x.xxx
>
> while 10.0.x.xxx is the ip of dom0s vifx.0
>
> strange....
>
>
>
> Florian Engelmann schrieb:
> > I just found this guide:
> > http://de.xen-forum.net/viewtopic.php?t=479&highlight=1und1
> >
> > But it is not working for me. I searched now 2 days but there is no 
> > real documentation of networking in xen 3.1 out there. I would like 
> > to enable NAT networking and dhcp on the privates LAN side. But I 
> > don't know how to setup xen-NAT at all and how to enable xen-dhcp. 
> > Isn't there any documentation? Is xen open source still in 
> > development or stopped it after citrix bought xensource?
> > Florian Engelmann schrieb:
> > > Hi,
> > > after hours of testing my last hope is the mailinglist. I have got a 
> > > root server (www.1und1.com) and I just installed debian etch amd64 
> > > on it. I maanged to compile xen 3.1 from source and also my 1st HVM 
> > > virtual guest is running fine (Windows 2003). But 1und1 uses a 
> > > absolut strange network setup I have never seen before and I do not 
> > > understand why it is working at all!?!
> > > These are the settings the root Sever is getting with DHCP (and they 
> > > are working...):
> > > ifconfig:
> > > eth0      Link encap:Ethernet  HWaddr 00:19:99:0D:CD:05
> > >          inet addr:87.106.189.xxx  Bcast:87.106.189.203  
> > > Mask:255.255.255.255
> > >          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
> > >          RX packets:15579 errors:0 dropped:0 overruns:0 frame:0
> > >          TX packets:15257 errors:0 dropped:0 overruns:0 carrier:0
> > >          collisions:0 txqueuelen:1000
> > >          RX bytes:1026640 (1002.5 KiB)  TX bytes:5709824 (5.4 MiB)
> > >          Interrupt:16 Base address:0x6000
> > >
> > > route -n:
> > > Kernel IP routing table
> > > Destination     Gateway         Genmask         Flags Metric Ref    
> > > Use Iface
> > > 10.255.255.1    0.0.0.0         255.255.255.255 UH    0      
> > > 0        0 eth0
> > > 10.0.0.0        0.0.0.0         255.0.0.0       U     0      
> > > 0        0 eth0
> > > 0.0.0.0         10.255.255.1    0.0.0.0         UG    0      
> > > 0        0 eth0
> > > the route is also set with dhcp but after updating from sarge to 
> > > etch i had to use a trick to set the route because dhcp3 did no more 
> > > use the modified (by 1und1) dhcp script.
> > > So this is my /etc/network/interfaces:
> > > auto lo eth0
> > > iface lo inet loopback
> > >
> > > iface eth0 inet dhcp
> > >       up ip route add 10.255.255.1/32 dev eth0
> > >       up ip route add default via 10.255.255.1
> > >
> > > auto eth0:0
> > > iface eth0:0 inet static
> > >       address 87.106.189.xxx
> > >       netmask 255.255.255.255
> > >       broadcast 87.106.189.xxx
> > >
> > > # xxx = always the same number (yes ip and broadcast are equal...)
> > >
> > > I am abolute no network specialist but I never thought a netmask of 
> > > 255.255.255.255 is valid and a client can communicate without a 
> > > reachable gateway... but it works...
> > > I installed my 1st HVM guest and tried to setup networking. Bridging 
> > > does not work because windows does not allow those strange network 
> > > settings, so I think NAT would be the solution, wouldn't it? But I 
> > > did not find any documentation about how to setup NAT with Xen 3.1.
> > > What IP do I have to setup at my dom0?
> > > Can I use eth0:x to set it up?
> > > Do I have to add any IP settings to my guest config:
> > > vif = [ 'type=ioemu, bridge=xenbr0' ] ?
> > > Should I use DHCP on the private LAN or static IPs?
> > > Can I use a 192.168.x.x network or do I have to use 10.x.x.x (I red 
> > > about it)?
> > > Do you have any good links about NAT and Xen 3.1?
> > >
> > > Many thanks for your help!
> > > Greetings Florian
> > >
> > > _______________________________________________
> > > Xen-users mailing list
> > > Xen-users@xxxxxxxxxxxxxxxxxxx
> > > http://lists.xensource.com/xen-users
> >
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>
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