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Bridged networking (for Xen) on a remote server
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svoop
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PostPosted: Thu Dec 06, 2012 7:57 pm    Post subject: Bridged networking (for Xen) on a remote server Reply with quote

Hi

I'm setting up Xen 4 on a remote server and can't wrap my mind around the bridged networking. I have separate static IP addresses for the host Dom0 as well as for each of the three guest DomU (all running Gentoo).

The automatic scripts in Xen 3 created and renamed all kind of interfaces (xenbr, peth, veth, vif), but Xen 4 dropped these scripts for good. Some of the "HOWIDIDs" I found describe a simpler approach with just one bridge xenbr0 with eth0 on one end. Not so sure about the other end though, can multiple vifs sit on the other end of xenbr0?

I have to admin that my networking knowledge is minimal. Maybe someone with more insight could help me out here? Or someone running a similar setup? My goal is to have all four Doms to communicate through the only network card installed eth0 but each to listen to it's own public static IP.

Thanks a lot for your help!
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Xenoist
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PostPosted: Fri Dec 07, 2012 10:10 pm    Post subject: Reply with quote

This is a bit tricky.

I use xen-4.1.3 with blktap on an intel modular server and some i7 testing machines.

Files to look at:

vi /etc/xen/scripts/network-bridge-wrapper
/etc/xen/scripts/network-bridge "$@" vifnum=0 netdev=eth0 bridge=xenbr0

Needs eth0 not peth0 if peth0 is set the interface would be named ppeth0!!!

vi /etc/xen/scripts/network-bridge

disable
# if [ `brctl show | wc -l` != 1 ]; then
# return
# fi

new syntax with udev !
vi /etc/udev/rules.d/70-persistent-net.rules

KERNEL=="eth*", ATTR{address}=="11:11:11:11:11:11", NAME="peth0"

vi /etc/conf.d/net

config_peth0="null"
bridge_xenbr0="peth0"
config_xenbr0="10.1.1.1/24"
#brctl_xenbr0="setfd 0 sethello 1 stp off"
routes_xenbr0="default via 10.1.1.111"
dns_servers_xenbr0="10.1.1.111"
dns_domain_xenbr0="domain.tld"

rc-status
net.peth0 [ started ]
net.xenbr0 [ started ]

net.eth0 is not added to default but still available for debug

vi /etc/xen/xend-config.sxp
#(network-script network-bridge)
(network-script network-bridge-wrapper)

blktap:

http://lists.xen.org/archives/html/xen-devel/2012-04/msg00583.html
ftp://ftp.enjellic.com/pub/xen/

Works with kernel 3.6.8 and xen 4.1.3.

In a few weeks i set up an Overlay with tis stuff.
iscsitarget is buggy too.

Only svn version is usable with new kernels.

http://gpo.zugaina.org/sys-block/iscsitarget
wget http://gpo.zugaina.org/AJAX/Ebuild/2207108 -O iscsitarget-9999
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svoop
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PostPosted: Sun Dec 16, 2012 10:08 am    Post subject: Reply with quote

@Xenoist: Thanks for your hints, I'll give it a shot later today!
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svoop
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PostPosted: Thu Dec 20, 2012 6:17 pm    Post subject: Reply with quote

Xenoist wrote:

In a few weeks i set up an Overlay with tis stuff.
iscsitarget is buggy too.

Only svn version is usable with new kernels.


What do you mean with the last sentence, just in reference to iscsitarget or in general? (I'm on kernel 3.5.7 and xen 4.1.1.)
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