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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-users] Interdomain routing problem
Okay, let me make sure I understand your setup here: xmclient1(eth0) - 10.0.1.1 xmrouter1(eth0) - 10.0.1.254 xmrouter1(eth1) - 10.0.2.1 xmrouter2(eth0) - 10.0.2.254 xmrouter2(eth1) - 10.0.3.1 xmrouter3(eth0) - 10.0.3.254 xmrouter3(eth1) - 10.0.4.1 xmserver(eth0) - 10.0.4.254 Your routing tables should look something like this xmclient: 10.0.1.0 dev eth0 default router 10.0.1.254 xmrouter1 10.0.1.0 dev eth0 10.0.2.0 dev eth1 10.0.3.0 gw 10.0.2.254 10.0.4.0 gw 10.0.2.254 (could also set default gw 10.0.2.254 instead of two previous route entries) xmrouter2 10.0.2.0 dev eth0 10.0.3.0 dev eth1 10.0.1.0 gw 10.0.2.1 10.0.4.0 gw 10.0.3.254 xmrouter3 10.0.3.0 dev eth0 10.0.4.0 dev eth1 10.0.1.0 gw 10.0.3.1 10.0.2.0 gw 10.0.3.1 (could also set default gw 10.0.3.1 instead of two prevous route entries) xmserver1 10.0.4.0 dev eth0 default gw 10.0.4.1 This should get the traffic from xmclient1 to xmserver1 and back again. Also make sure you enable ipv4 packet forwarding either via sysctl or manually echoing into the correct /proc location. Nick Couchman Systems Integrator SEAKR Engineering, Inc. 6221 South Racine Circle Centennial, CO 80111 Main: (303) 790-8499 Fax: (303) 790-8720 Web: http://www.seakr.com >>> Robert Hulme < rob@xxxxxxxxxxxx > 2005/09/08 16:33 >>> Could someone please help? I'm trying to setup a 'simulation network' where there are two domains A and B with 3 'routers' between them. I have tried the following: xmclient:~# ifconfig eth0 10.0.1.1 xmclient:~# route add -net 10.0.4.0 netmask 255.255.255.0 dev eth0 xmrouter1:~# ifconfig eth0 10.0.1.254 xmrouter1:~# ifconfig eth1 10.0.2.1 xmrouter1:~# route add -net 10.0.4.0 netmask 255.255.255.0 dev eth1 xmrouter2:~# ifconfig eth0 10.0.2.254 xmrouter2:~# route add -net 10.0.1.0 netmask 255.255.255.0 dev eth0 xmrouter2:~# ifconfig eth1 10.0.3.1 xmrouter2:~# route add -net 10.0.4.0 netmask 255.255.255.0 dev eth1 xmrouter3:~# ifconfig eth0 10.0.3.254 xmrouter3:~# route add -net 10.0.1.0 netmask 255.255.255.0 dev eth0 xmrouter3:~# ifconfig eth1 10.0.4.1 xmserver:~# ifconfig eth0 10.0.4.254 xmserver:~# route add -net 10.0.1.0 netmask 255.255.255.0 dev eth0 Where in A is xmclient and B is xmserver. What I expect to happen is now that xmclient and xmserver can talk to one another, and that packets will merrily hop from xmclient -> xmrouter1 -> xmrouter2 -> xmrouter3 -> xmserver and backwards... When I ping I get... xmserver:~# ping 10.0.1.1 PING 10.0.1.1 (10.0.1.1) 56(84) bytes of data. 64 bytes from 10.0.1.1: icmp_seq=1 ttl=64 time=0.579 ms 64 bytes from 10.0.1.1: icmp_seq=2 ttl=64 time=0.184 ms 64 bytes from 10.0.1.1: icmp_seq=3 ttl=64 time=0.153 ms 64 bytes from 10.0.1.1: icmp_seq=4 ttl=64 time=0.169 ms --- 10.0.1.1 ping statistics --- 4 packets transmitted, 4 received, 0% packet loss, time 2999ms rtt min/avg/max/mdev = 0.153/0.271/0.579/0.178 ms All good and hunkey dorey so far :-P Now to check on the hopping... xmserver:~# traceroute 10.0.1.1 traceroute to 10.0.1.1 (10.0.1.1), 30 hops max, 38 byte packets 1 10.0.1.1 (10.0.1.1) 0.215 ms 5.151 ms 0.180 ms Ah... only one hop, not what I expected... What have I done wrong? Is it a general networking mistake I've made in my thinking here or is there some kind of xen magic happening where xen knows it can route from xmserver to xmclient and so doesn't do all the intermediate hops I have tried to put in place? If so how can I prevent that? Muchos gracias! -Rob -- ------------------------------------------------------ Fran: Do you know that in Tibet when they want something they give something away? Bernard: Do they? That must be why they're such a dominant global power. -- Black Books http://www.robhulme.com/ http://robhu.livejournal.com/ _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users Attachment:
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