Re: [Xen-users] advanced bridging...

[Ronan <r.mcglue@xxxxxxxxx>]

ok i now have a domu with 2 (apparent)ethernet interfaces, which is a
good start.
How do i now get all ethernet frames to be passed to eth0 on my firewall
domu ?
I then will be setting the firewall up with a caching DNS , NAT, and
dhcp on its eth1 to serve all the rest of my domU's usig nprivate 192.168.

Question though., how should i configure an IP for use by dom0??

Thanks
R

> Marc Patino Gómez wrote:
> > Hi again,
> >
> > this is the config of xen in my Debian Etch:
> >
> > /etc/xen/xend-config
> >
> > (network-script network-bridge-wrapper)
> > (vif-script vif-bridge)
> > (dom0-min-mem 196)
> > (dom0-cpus 0)
> > (vncpasswd '')
> > --------------------------------------------------------------------------- 
> >
> > /etc/xen/scripts/network-bridge-wrapper
> >
> > /etc/xen/scripts/network-bridge start bridge=xenbr0 vifnum=0
> > /usr/sbin/brctl addbr xenbr1
> > /sbin/ifconfig xenbr1 up
> > ---------------------------------------------------------------------------- 
> >
> > the domu (Firewall)
> >
> > /etc/xen/firewall-config.sxp
> >
> >
> > name="firewall"
> > kernel="/boot/vmlinuz-2.6.16.33-xenU-x86_64"
> > root="/dev/hda1"
> > cpu=3
> > memory=256
> > disk=['file:/xen1/firewall.img,hda1,w']
> >
> > vif=[ 
> > 'mac=00:16:3e:70:21:02,bridge=xenbr0,vifname=firewall.eth0','mac=00:16:3e:70:32:02,bridge=xenbr1,vifname=firewall.eth1' 
> > ]
> > dhcp="off"
> > ip="XX.XX.XX.XX"
> > netmask="255.255.255.0"
> > gateway="XX.XX.XX.XX"
> > hostname="firewall.domain.com"
> >
> > extra="3"
> >
> > on_poweroff = 'destroy'
> > on_reboot   = 'restart'
> > on_crash    = 'restart'
> > ------------------------------------------------------------------------------- 
> >
> > in this domU (the firewall) I have a bridge between eth1 and eth0, 
> > you can do in CentOS way (inside the domain) ;)
> > here is the config file of a domu behind the FW:
> >
> > /etc/xen/domu-config.sxp
> > name="domu"
> > kernel="/boot/vmlinuz-2.6.16.33-xenU-x86_64"
> > root="/dev/hda1"
> > cpu=3
> > memory=92
> > disk=['file:/xen1/domu.img,hda1,w']
> >
> > vif=[ 'bridge=xenbrFW , vifname=domu.eth0' ]
> > dhcp="off"
> > ip="XX.XX.XX.XX"
> > netmask="255.255.255.0"
> > gateway="XX.XX.XX.XX"
> > hostname="domu.domain.com"
> >
> > extra="3"
> >
> > on_poweroff = 'destroy'
> > on_reboot   = 'restart'
> > on_crash    = 'restart'
> > ---------------------------------------------------------------------------------------------------- 
> >
> > In the domU (firewall) I have the following iptables config:
> > #!/bin/sh
> > # /etc/network/if-pre-up.d/iptables-start
> >
> > iptables=/sbin/iptables
> >
> > $iptables -F
> >
> > $iptables -P INPUT ACCEPT
> > $iptables -P FORWARD ACCEPT
> > $iptables -P OUTPUT ACCEPT
> >
> > # Logs
> > #$iptables -A INPUT -j LOG   --log-prefix="IPTABLES-INPUT: "
> > #$iptables -A OUTPUT -j LOG  --log-prefix="IPTABLES-OUTPUT: "
> > #$iptables -A FORWARD -j LOG --log-prefix="IPTABLES-FORWARD: "
> >
> > $iptables -A INPUT -i lo -j ACCEPT
> >
> > # Traffic control
> > tc qdisc del dev eth0 parent root
> > tc qdisc add dev eth0 parent root handle 1:0 htb default 40
> > tc class add dev eth0 parent 1:0 classid 1:1 htb rate 10mbit
> > tc class add dev eth0 parent 1:1 classid 1:10 htb rate 512kbit
> > tc class add dev eth0 parent 1:1 classid 1:20 htb rate 1mbit
> > tc class add dev eth0 parent 1:1 classid 1:30 htb rate 2mbit
> > tc class add dev eth0 parent 1:1 classid 1:40 htb rate 5mbit
> >
> > tc qdisc del dev eth1 parent root
> > tc qdisc add dev eth1 parent root handle 2:0 htb default 40
> > tc class add dev eth1 parent 2:0 classid 2:1 htb rate 10mbit
> > tc class add dev eth1 parent 2:1 classid 2:10 htb rate 512kbit
> > tc class add dev eth1 parent 2:1 classid 2:20 htb rate 1mbit
> > tc class add dev eth1 parent 2:1 classid 2:30 htb rate 2mbit
> > tc class add dev eth1 parent 2:1 classid 2:40 htb rate 5mbit
> >
> > $iptables -t mangle -A POSTROUTING -d XX.XX.XX.XX -j CLASSIFY 
> > --set-class 2:20
> > $iptables -t mangle -A POSTROUTING -s XX.XX.XX.XX -j CLASSIFY 
> > --set-class 1:20
> > Sustitute XX.XX.XX.XX by your ip 's ;)
> >
> > There is an issue with the traffic control in one way, the rate is 
> > multiplied by 2, I don't know the reason :(, I have tested this tc 
> > config with another box without XEN and it works great.
> > Don't forget to do this:
> >
> > echo "0" >/proc/sys/net/bridge/bridge-nf-call-iptables
> >
> > see the post " iptables and state matches (established, related)" in 
> > this mail list. You can put it in your sysctl.conf.
> > So... that's all (I hope :) ) if you need anything else.... tell me
> >
> > Regards,
> >
> > Marc
> >
> >
> > Ronan wrote:
> > > Marc
> > > thats exactly what i require...
> > > any of your config would be really helpful!
> > >
> > > many thanks in advance!
> > >
> > > Ronan
> > > > Hi Ronan,
> > > >
> > > > do you want to do something like this (see the image) ?
> > > >
> > > > After reading a lot of stuff I made a wrapper of network-bridge, 
> > > > that I call network-bridge-wrapper, here is it:
> > > > #!/bin/sh
> > > > /etc/xen/scripts/network-bridge start bridge=xenbr0 vifnum=0
> > > > /usr/sbin/brctl addbr xenbr1
> > > > /sbin/ifconfig xenbr1 up
> > > >
> > > > I changed the line in xend-config.sxp that calls, network-bridge to 
> > > > call network-bridge-wrapper ...
> > > > If you want I can post more info about this config (my domu config 
> > > > files, iptables, ebtables....). I'm using Debian, so... I hope 
> > > > scripts  in CentOS are so close to Debian.
> > > > Regards,
> > > >
> > > > Marc
> > > >
> > > >
> > > > Ronan wrote:
> > > > > My situation:
> > > > > Running centos5 on a machine directly connected to internet.
> > > > > I have a paravirtualised centos5 core machine in domu1 with only 1 
> > > > > eth configured eth0 dy dhcp.
> > > > > What I want:
> > > > > to configure the dom0 bridge to simply route all traffic at 
> > > > > ethernet level to dom1(firewall/router) and have dom1 then nat if 
> > > > > out to my other domu's and machines on my private 192.168 network 
> > > > > using dhcpd configured on eth1 on the machine.
> > > > > My difficulties:
> > > > > setting up the dom0 bridging to do what i want ie xenbr0 to eth0 
> > > > > on domu1 and then xenbr1 to eth1 on domu1
> > > > > I then intend to remove / lock dom0 down and only use the domu's 
> > > > > as dhcp configured servers.
> > > > > There are a couple of URLs i've looked at
> > > > > http://lists.xensource.com/archives/html/xen-users/2006-02/msg00602.html 
> > > > >
> > > > > etc but there aren't any specific configuration information.
> > > > > Can i get some pointers as to where to look, or even example configs?
> > > > >
> > > > > thanks
> > > > >
> > > > > Ronan
> > > > >
> > > > > (ps if this is the 3rd like message of mine today i apologise, I 
> > > > > can tell if the other two messages i send actually did...)
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