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



Actually, I take it back in your example I guess you can add a static
route to the network where DNS servers are and that should do it.

PS: You can have multiple routing tables which are selected base on
the rules (which I forgot to mention):
http://lartc.org/howto/lartc.rpdb.html

On Thu, Mar 13, 2008 at 1:57 PM, isplist logicore net
<isplist 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 logicore net
> > <isplist 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 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 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 redhat com [mailto:linux-cluster-
> >>>>> bounces redhat com] On Behalf Of gordan 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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> >>>>>
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> >>>>>
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> >>
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