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Re: [Xen-users] How to setup Xen for 3 bridges environment?

If you fixed the vif/veth usage as I told you and it's still broken, I can't help you without more info. You did provide a lot of info, but there were some holes. 

If you'd like to provide more info, I suggest the following:

1. A script that sets up the whole thing
2. The outputs of the following after running the above script
ip addr list
ip route list
brctl show
iptables -L
iptables -t nat -L
xm list

Cheers,
Dan.

Hong @ gmail wrote:


Hi Daniel,

Really thanks for your hints and it is really the checksum errors.
When I ssh from PC ( 192.168.21.100) in Wan to domU in xbrdmz0, it has checksum errors. It causes me not able to use ssh. 
-------------------------------------------------------------
[root@jssrv01 conf]# tcpdump -v -n host 192.168.21.15
tcpdump: WARNING: eth0: no IPv4 address assigned
tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes 00:13:01.797379 IP (tos 0x0, ttl 128, id 25066, offset 0, flags [DF], proto 6, length: 48) 192.168.21.100.1521 > 192.168.21.15.ssh: S [tcp s 
um ok] 4291786245:4291786245(0) win 65535 <mss 1460,nop,nop,sackOK>
00:13:01.798189 IP (tos 0x0, ttl 63, id 0, offset 0, flags [DF], proto 6, length: 48) 192.168.21.15.ssh > 192.168.21.100.1521: S [tcp sum o k] 2137667989:2137667989(0) ack 4291786246 win 5840 <mss 1460,nop,nop,sackOK> 00:13:01.798364 IP (tos 0x0, ttl 128, id 25067, offset 0, flags [DF], proto 6, length: 40) 192.168.21.100.1521 > 192.168.21.15.ssh: . [tcp s 
um ok] ack 1 win 65535
00:13:01.823132 IP (tos 0x0, ttl 63, id 48214, offset 0, flags [DF], proto 6, length: 60) 192.168.21.15.ssh > 192.168.21.100.1521: P [bad t 
cp cksum 3a1 (->5a1)!] 1:21(20) ack 1 win 5840
00:13:04.816419 IP (tos 0x0, ttl 63, id 48216, offset 0, flags [DF], proto 6, length: 60) 192.168.21.15.ssh > 192.168.21.100.1521: P [bad t 
cp cksum 3a1 (->5a1)!] 1:21(20) ack 1 win 5840
00:13:08.706572 IP (tos 0x0, ttl 63, id 27133, offset 0, flags [DF], proto 6, length: 60) 192.168.21.15.ssh > 192.168.21.100.1520: P [bad t 
cp cksum b307 (->b507)!] 2129139235:2129139255(20) ack 731365070 win 5840
00:13:10.816417 IP (tos 0x0, ttl 63, id 48218, offset 0, flags [DF], proto 6, length: 60) 192.168.21.15.ssh > 192.168.21.100.1521: P [bad t 
cp cksum 3a1 (->5a1)!] 1:21(20) ack 1 win 5840
00:13:22.816419 IP (tos 0x0, ttl 63, id 48220, offset 0, flags [DF], proto 6, length: 60) 192.168.21.15.ssh > 192.168.21.100.1521: P [bad tcp cksum 3a1 (->5a1)!] 1:21(20) ack 1 win 5840 00:13:32.706490 IP (tos 0x0, ttl 63, id 27135, offset 0, flags [DF], proto 6, length: 60) 192.168.21.15.ssh > 192.168.21.100.1520: P [bad tcp cksum b307 (->b507)!] 0:20(20) ack 1 win 5840 00:13:46.816434 IP (tos 0x0, ttl 63, id 48222, offset 0, flags [DF], proto 6, length: 60) 192.168.21.15.ssh > 192.168.21.100.1521: P [bad tcp cksum 3a1 (->5a1)!] 1:21(20) ack 1 win 5840
However, as said before, if I don't create the xbrwan0 and use eth0 instead. I can ssh from PC in Wan to domU. The tcpdump shows as follows: (PC and domU talks perfectly to each other). 
------------------------------------------
[root@jssrv01 conf]# tcpdump -v -n host 192.168.21.15
tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes 00:24:39.154125 IP (tos 0x0, ttl 128, id 29657, offset 0, flags [DF], proto 6, length: 48) 192.168.21.100.support > 192.168.21.15.ssh: S [tcp sum ok] 3072641878:3072641878(0) win 65535 <mss 1460,nop,nop,sackOK> 00:24:39.154804 IP (tos 0x0, ttl 63, id 0, offset 0, flags [DF], proto 6, length: 48) 192.168.21.15.ssh > 192.168.21.100.support: S [tcp sum ok] 2802605415:2802605415(0) ack 3072641879 win 5840 <mss 1460,nop,nop,sackOK> 00:24:39.155017 IP (tos 0x0, ttl 128, id 29658, offset 0, flags [DF], proto 6, length: 40) 192.168.21.100.support > 192.168.21.15.ssh: . [tcp sum ok] ack 1 win 65535 00:24:39.195572 IP (tos 0x0, ttl 63, id 57410, offset 0, flags [DF], proto 6, length: 60) 192.168.21.15.ssh > 192.168.21.100.support: P [bad tcp cksum abf2 (->ad7e)!] 1:21(20) ack 1 win 5840 00:24:39.200501 IP (tos 0x0, ttl 128, id 29661, offset 0, flags [DF], proto 6, length: 68) 192.168.21.100.support > 192.168.21.15.ssh: P [tcp sum ok] 1:29(28) ack 21 win 65515 00:24:39.201187 IP (tos 0x0, ttl 63, id 57412, offset 0, flags [DF], proto 6, length: 40) 192.168.21.15.ssh > 192.168.21.100.support: . [tcp sum ok] ack 29 win 5840 00:24:39.205163 IP (tos 0x0, ttl 63, id 57414, offset 0, flags [DF], proto 6, length: 680) 192.168.21.15.ssh > 192.168.21.100.support: P 21:661(640) ack 29 win 5840 00:24:39.210997 IP (tos 0x0, ttl 128, id 29665, offset 0, flags [DF], proto 6, length: 528) 192.168.21.100.support > 192.168.21.15.ssh: P 29:517(488) ack 661 win 64875 00:24:39.211064 IP (tos 0x0, ttl 128, id 29666, offset 0, flags [DF], proto 6, length: 56) 192.168.21.100.support > 192.168.21.15.ssh: P [tcp sum ok] 517:533(16) ack 661 win 64875 00:24:39.249606 IP (tos 0x0, ttl 63, id 57416, offset 0, flags [DF], proto 6, length: 40) 192.168.21.15.ssh > 192.168.21.100.support: . [tcp sum ok] ack 533 win 5840 00:24:39.258471 IP (tos 0x0, ttl 63, id 57418, offset 0, flags [DF], proto 6, length: 320) 192.168.21.15.ssh > 192.168.21.100.support: P 661:941(280) ack 533 win 5840 00:24:39.372868 IP (tos 0x0, ttl 128, id 29670, offset 0, flags [DF], proto 6, length: 40) 192.168.21.100.support > 192.168.21.15.ssh: . [tcp sum ok] ack 941 win 64595 00:24:39.551000 IP (tos 0x0, ttl 128, id 29672, offset 0, flags [DF], proto 6, length: 312) 192.168.21.100.support > 192.168.21.15.ssh: P 533:805(272) ack 941 win 64595
Though the problem is located, I still don't know how to fix it...( I will search the list for any findings..) 
But....Just wonder Daniel has any further hints for me.... ;->
As I said before, I am new to Xen. This configuration is just an outcome of trial and error. I remember I initially use the default Xen configuration and has some problems (I cannot remember is it exactly the same as this one or not). Then, I change the configuration bit by bit and finally down this situation. I am happy to stick with Xen default. As Fernando gives me some reference, I will also check if it suit my target configuration. 

Hong...




----- Original Message ----- From: "Daniel Goertzen" <goertzen@xxxxxxxx>
To: "Hong @ gmail" <whtsang22@xxxxxxxxx>
Cc: "Xen-users" <xen-users@xxxxxxxxxxxxxxxxxxx>
Sent: Saturday, January 28, 2006 10:59 PM
Subject: Re: [Xen-users] How to setup Xen for 3 bridges environment?
Hong, I don't grasp the full complexity of what you're trying to do, but I note that you are bypassing the vif0.x/veth0.x interfaces in dom0 which bypasses some special xen networking magic. Instead of assigning ip addresses directly to xbrwan0, add vif0.0 to xbrwan0 and assign the addresses to veth0. Likewise for the other bridges. 

Search the list tcp checksum errors for more info on this.

Cheers,
Dan.

Hong @ gmail wrote:


Hi Fernando Maior,
Thanks for your information. I have a quick look on the Wiki document, but find that it is a bit different from my current setup. In my setup, I create 3 bridges in dom0 and dom0 also act as the firewall. 
Following is the summary of my configuration:

1) I by-pass the Xen bridge.
- comment out the '(network-script network-bridge)' and '(vif-script vif-bridge)' in 'xend-config.sxp' 
  - comment out the 'handle_iptable' in vif-bridge.

2) Create my own 3 bridges as follows:
  #
  # xbrwan0 (Wan bridge)
  #
  ip link set eth0 down
  ip addr flush eth0
  brctl addbr xbrwan0
  brctl stp xbrwan0 off
  brctl setfd xbrwan0 0
ip addr add 192.168.21.11/24 dev xbrwan0 brd + (the xbrwan0 bridge ip) ip addr add 192.168.21.15/24 dev xbrwan0 brd + (NAT ip to 192.168.22.15) ip addr add 192.168.21.16/24 dev xbrwan0 brd + (NAT ip to 192.168.22.16) 
  sleep 2
  brctl addif xbrwan0 eth0
  ifconfig eth0 0.0.0.0 up
  ip link set xbrwan0 up
  #
  # xbrdmz0 (Dmz bridge)
  #
  brctl addbr xbrdmz0
  brctl stp xbrdmz0 off
  brctl setfd xbrdmz0 0
ifconfig xbrdmz0 192.168.22.11 netmask 255.255.255.0 up (the Dmz bridge ip) 
  #
  # xbrlan0 (Lan bridge)
  #
  brctl addbr xbrlan0
  brctl stp xbrlan0 off
  brctl setfd xbrlan0 0
ifconfig xbrlan0 192.168.23.11 netmask 255.255.255.0 up (the Lan bridge ip) 

3) Start two domU with ip 15 and 16
  xm create domU01  (ip 192.168.21.15)
  xm create domU02  (ip 192.168.21.16)

4) Create the NAT tables.
  #
  iptables -X
  iptables -F
  iptables -X -t nat
  iptables -F -t nat
iptables -t nat -A PREROUTING -i xbrwan0 -d 192.168.21.15 -j DNAT --to 192.168.22.15 iptables -t nat -A POSTROUTING -o xbrwan0 -s 192.168.22.15 -j SNAT --to 192.168.21.15 iptables -t nat -A PREROUTING -i xbrwan0 -d 192.168.21.16 -j DNAT --to 192.168.22.16 iptables -t nat -A POSTROUTING -o xbrwan0 -s 192.168.22.16 -j SNAT --to 192.168.21.16 
  sysctl -w net.ipv4.ip_forward=1

In above setup, I ssh from Pc in Wan to domU01 and domU02.
If I didn't create the Wan bridge, instead using the eth0, I can ssh from PC in Wan to domU01 and domU02.
========================================================================= 
Following is the ifconfig and brctl show result.
[root@jssrv01 conf]# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:0D:0B:A7:2F:88
         UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
         RX packets:4710 errors:0 dropped:0 overruns:0 frame:0
         TX packets:4760 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:1000
         RX bytes:717399 (700.5 KiB)  TX bytes:469146 (458.1 KiB)
         Interrupt:5 Base address:0xe800

lo        Link encap:Local Loopback
         inet addr:127.0.0.1  Mask:255.0.0.0
         UP LOOPBACK RUNNING  MTU:16436  Metric:1
         RX packets:0 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:0 (0.0 b)  TX bytes:0 (0.0 b)

vif1.0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
         UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
         RX packets:33 errors:0 dropped:0 overruns:0 frame:0
         TX packets:451 errors:0 dropped:22 overruns:0 carrier:0
         collisions:0 txqueuelen:0
         RX bytes:2418 (2.3 KiB)  TX bytes:27310 (26.6 KiB)

vif2.0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
         UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
         RX packets:53 errors:0 dropped:0 overruns:0 frame:0
         TX packets:434 errors:0 dropped:27 overruns:0 carrier:0
         collisions:0 txqueuelen:0
         RX bytes:3740 (3.6 KiB)  TX bytes:25916 (25.3 KiB)

xbrdmz0   Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
inet addr:192.168.22.11 Bcast:192.168.22.255 Mask:255.255.255.0 
         UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
         RX packets:86 errors:0 dropped:0 overruns:0 frame:0
         TX packets:32 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:0
         RX bytes:4954 (4.8 KiB)  TX bytes:2208 (2.1 KiB)

xbrlan0   Link encap:Ethernet  HWaddr 00:00:00:00:00:00
inet addr:192.168.23.11 Bcast:192.168.23.255 Mask:255.255.255.0 
         UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
         RX packets:0 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:0 (0.0 b)  TX bytes:0 (0.0 b)

xbrwan0   Link encap:Ethernet  HWaddr 00:0D:0B:A7:2F:88
inet addr:192.168.21.11 Bcast:192.168.21.255 Mask:255.255.255.0 
         UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
         RX packets:4709 errors:0 dropped:0 overruns:0 frame:0
         TX packets:4049 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:0
         RX bytes:646686 (631.5 KiB)  TX bytes:416226 (406.4 KiB)

and brctl show result:
[root@jssrv01 conf]# brctl show
bridge name     bridge id               STP enabled     interfaces
xbrdmz0         8000.feffffffffff       no                     vif1.0

vif2.0
xbrlan0         8000.feffffffffff       no                     vif3.0
xbrwan0         8000.000d0ba72f88       no             eth0

Thanks
----- Original Message ----- From: "Fernando Maior" <fernando.souto.maior@xxxxxxxxx> To: "Hong @ gmail" <whtsang22@xxxxxxxxx>; "Xen-users" <xen-users@xxxxxxxxxxxxxxxxxxx> 
Sent: Friday, January 27, 2006 7:28 PM
Subject: Re: [Xen-users] How to setup Xen for 3 bridges environment?


Hong,

Did you have a look at Xen wiki documentation? You may
compare http://wiki.xensource.com/xenwiki/XenNetworkingSuse
to your experience and try something like that.

On 1/26/06, Hong @ gmail <whtsang22@xxxxxxxxx> wrote:



Hello,

I am new to Xen and is trying a confugration that simulates a firewall
environment.
My target environment is to setup three bridges: one for Wan (xen-br0), one 
for DMZ (xbrdmz) and one for Lan (xbrlan)
The three subnet are as follows:
Wan: 192.168.21.0/24
Dmz: 192.168.22.0/24
Lan:   192.168.23.0/24

I use xen3.0 and FC4 for both dom0 and domU.
My machine currently has one Nic, eth0, and I ensalve it into the Wan bridge 
xen-br0.

Dom0 has the IP address 192.168.21.11. I have two domU in DMZ with IP
192.168.22.15, 192.168.22.16).
I use NAT 192.168.21.15 -> 192.168.22.15 and 192.168.21.16 -> 192.168.22.16 
so that the PC from Wan can access the PC.
Most of the things work fine. I can ping dom0 and the two domU and vice versa. I can ssh from dom0 and domU and vice versa and I can ssh from PC on 
Wan to dom0.
The only problem is that I cannot ssh from PC on Wan to domU.
I have tried another setup. If I don't use the Wan bridge ( xen-br0 ) and just use the eth0 and the Dmz bridge (xbrdmz), everything works perfectly. 
(I can ssh from PC on Wan to domU also).
However, I still want to have the Wan bridge cause I can add some domU in 
Wan subnet (so that I can say, add some IDS domU to Wan bridge).
I have searched the mailing list and find a similar case is:
http://lists.xensource.com/archives/html/xen-users/2005-06/msg00669.html 

I have tried the NOTRACK option but still can help in my case.

Just wonder anyone has setup similar environment?
Thanks alot.


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--
Bye,
Fernando Maior
LPIC/1(31908)
LinuxCounter(391325)

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