[Linux-cluster] Two node NFS cluster serving multiple networks

Thu Mar 13 21:24:15 UTC 2008

Well, that depends where his DNS servers are. If they are on, for
example, 192.168.2 then DNS traffic is routed through the public
interface.

2008/3/13 Bennie Thomas <Bennie_R_Thomas at raytheon.com>:
> I never use multiple routes. can cause you some grief. Make sure your
> /etc/hosts, /etc/resolv.conf, /etc/nsswitch.conf files.
> I use multiple networks currently and have no problems with the traffic
> going out the correct paths
>
> B
>
>
>
> splist at logicore.net wrote:
> Guess I forgot to edit those IP's :).
>
> I thought you could only have one
> default gateway on a machine.
> I've never needed to deal with multiple nics
> other than bonded.
>
> PS: What does tab 1/2 mean?
>
> Mike
>
>
> On Thu, 13 Mar 2008
> 13:39:25 -0700, Alex Kompel wrote:
>
> Google "linux policy based routing".
>
> In your example you just need to setup
> different gateways for both
> interfaces. For example:
> ip route add default
> via 69.2.237.57 dev eth0 tab 1
> ip route add default via 192.168.1.1 dev eth1
> tab 2
>
>
> On Thu, Mar 13, 2008 at 9:23 AM,
> isplist at logicore.net
> <isplist at logicore.net> wrote:
>
> Is there a good document somewhere which explains in not too
> great
> technical
> terms how to use multiple nics on a system. I've been
> running bonded nics
> for
> many years but getting a machine to use two (or more
> networks) is still a
> mystery to me.
>
> For example, I have a VoIP machine
> which has two nics which I have
> problems
> with because I don't understand the
> above yet.
>
> This machine has a nic allows incoming VoIP/ZIP connections to
> it's
> public IP
> address on a T1. The router blocks everything but that
> traffic.
>
> Then it has a second nic which has a private IP on it to allow
> for
> management
> of the machine. Yet recently, it lost it's DNS, it can't seem
> to get
> access to
> DNS on it's own. I can force it to use DNS by typing ping
> commands a
> couple of
> times but it cannot do it on it's own to get it's
> updates for example.
>
> Basically, I need the machine to see it's public
> gateway at xx.x.237.59 to
> route it's VoIP/SIP traffic but I also need it to
> see it's private
> gateway at
> 192.168.1.0 so that it can use DNS and other
> internal services properly.
>
> route -n
> Kernel IP routing table
> Destination
> Gateway Genmask Flags Metric Ref Use
> Iface
> xx.x.237.56 0.0.0.0
> 255.255.255.248 U 0 0 0 eth0
> 192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0
> eth1
> 169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0
> eth1
> 0.0.0.0 69.2.237.57
> 0.0.0.0 UG 0 0 0
> eth0
>
> ifconfig
> eth0 Link encap:Ethernet HWaddr
> 00:90:27:DC:4B:E6
> inet addr:xx.x.237.59 Bcast:69.2.237.63
> Mask:255.255.255.248
> inet6 addr: fe80::290:27ff:fedc:4be6/64 Scope:Link
> UP
> BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:33910280 errors:16
> dropped:0 overruns:0 frame:16
> TX packets:45988648 errors:0 dropped:0
> overruns:0 carrier:0
> collisions:24746 txqueuelen:1000
> RX bytes:681966199
> (650.3 MiB) TX bytes:1657358619 (1.5 GiB)
>
> eth1 Link encap:Ethernet HWaddr
> 00:13:20:55:D7:CE
> inet addr:192.168.1.102 Bcast:192.168.1.255
> Mask:255.255.255.0
> inet6 addr: fe80::213:20ff:fe55:d7ce/64 Scope:Link
> UP
> BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:87417784 errors:0
> dropped:0 overruns:0 frame:0
> TX packets:70881957 errors:0 dropped:0
> overruns:0 carrier:0
> collisions:0 txqueuelen:1000
> RX bytes:4171601084 (3.8
> GiB) TX bytes:1547562481 (1.4 GiB)
>
> lo Link encap:Local Loopback
> inet
> addr:127.0.0.1 Mask:255.0.0.0
> inet6 addr: ::1/128 Scope:Host
> UP LOOPBACK
> RUNNING MTU:16436 Metric:1
> RX packets:6501004 errors:0 dropped:0 overruns:0
> frame:0
> TX packets:6501004 errors:0 dropped:0 overruns:0
> carrier:0
> collisions:0 txqueuelen:0
> RX bytes:897257336 (855.6 MiB) TX
> bytes:897257336 (855.6 MiB)
>
>
> Mike
>
>
> On Wed, 12 Mar 2008 10:39:50 -0700,
> Alex Kompel wrote:
>
> You will still need some way to tell the system through which
>
> interface you
> want to route outgoing packets for each target.
> You can achieve the same
> with greater ease by splitting the network in
> 2 subnets and assigning each
> to a single interface.
> It all depends on the problem you are trying to
> solve. If you want
> redundancy - use active-passive bonding, you want
> throughput - use
> active-active bonding (if your switch supports link
> aggregation), if
> you want security and isolation - use separate
> subnets.
>
> -Alex
>
> 2008/3/12 Brian Kroth <bpkroth at wisc.edu>:
>
> This is a hypothetical, but what if you have two interfaces on
> the
> same
> network and want to force one service IP to one interface and
> the
> other
> to a different interface? I think what everyone is wondering is
> how
> much control one has over the service IP
> placement.
>
> Thanks,
> Brian
>
> Finnur Örn Guðmundsson - TM Software <fog at t.is>
> 2008-03-12 14:36:
>
>
>
> Hi,
>
> I see no reason why you could not have 3 diffrent interfaces,
> each
> connected to the networks you are trying to serve the NFS
> requests
> to/from. RG Manager will add the floating interfaces to
> the
> "correct"
> interface, that is, if your floating ip is 1.2.3.4 and you
> have a
> interface with the IP address 1.2.3.3 he will add the IP to
> that
> interface.
>
>
> Bgrds,
> Finnur
>
> -----Original Message-----
> From:
> linux-cluster-bounces at redhat.com [mailto:linux-cluster-
> bounces at redhat.com]
> On Behalf Of gordan at bobich.net
> Sent: 12. mars 2008 14:10
> To: linux
> clustering
> Subject: Re: [Linux-cluster] Two node NFS cluster serving
> multiple
> networks
>
> Sounds very similar to what I'm trying to achieve (see
> the other
> thread
> about binding failover resources to interfaces). I've not
> seen a
> response
> yet, so I'm most curious to see if you'll get
> any.
>
> Gordan
>
> On Wed, 12 Mar 2008, Randy Brown wrote:
>
>
> I am using a two node cluster with Centos 5 with up to date
> patches.
> We
> have
> three different networks to which I would like to serve nfs mounts
> from
> this
> cluster. Can this even be done? I have interfaces available
> for
> each
> network in each node?
>
>
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