Re: Routing Problem

Wed, 02 Feb 2005 06:25:00 -0800 

Sounds like the man page for routed might be what you seek

http://www.freebsd.org/cgi/man.cgi?query=routed&sektion=8

T

----- Original Message ----- From: "Gustafson, Tim" <[EMAIL PROTECTED]>
To: "Thomas Foster" <[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>
Sent: Wednesday, February 02, 2005 5:02 AM
Subject: RE: Routing Problem


Thomas (and John too),

Let me clarify a little bit.

What I have is this:

A single FreeBSD web server with a single NIC in it
Two T1 routers, each with a different subnet.

My FreeBSD box has two IP addresses assigned to it, one from the first
subnet and one from the second subnet.

I want to use round-robin DNS to direct half my web traffic to the first
IP and half to the second IP.

As I said to John in a private e-mail earlier this morning, I have a
Windows 2000 box that is doing exactly this with these two subnets right
now.  I know it "can" be done.  I have a feeling that the FreeBSD TCP
stack lacks the capability.  By the way, this also works with Cisco
hardware.  I have used Cisco equipment in this same configuration in the
past.

I think they way it SHOULD work is that you should be able to give a
FreeBSD box multiple default gateways.  When FreeBSD gets a packet to an
IP on the first subnet, it should use the default gateway that is also
on that subnet.  When FreeBSD gets a packet to an IP on the second
subnet, it should use the second default gateway.  This seems to be the
logic that Windows (and Cisco) uses.

Tim Gustafson
MEI Technology Consulting, Inc
[EMAIL PROTECTED]
(516) 379-0001 Office
(516) 480-1870 Mobile/Emergencies
(516) 908-4185 Fax
http://www.meitech.com/ 



-----Original Message-----
From: Thomas Foster [mailto:[EMAIL PROTECTED]
Sent: Wednesday, February 02, 2005 7:57 AM
To: Gustafson, Tim
Cc: [EMAIL PROTECTED]
Subject: Re: Routing Problem


Hi Tim..

If you have multiple interfaces and you configure a default gateway for
each interface, the default metric determination that is based on the speed
of the interface usually uses the fastest interface for default gateway traffic. This is usually desirable in configurations in which the
computer is connected to the same network.

This behavior can become a problem when the computer exists on two or
more disjointed networks (networks that do not provide symmetric reachability
on layer3). Symmetric reachability exists when packets can be sent to and received from an arbitrary destination.

Because the TCP/IP version4 protocol uses a single default route in FreeBSD's routing table at any one time for default route traffic,
default routers configured on multiple interfaces connected to two or more disjointed networks can wreak routing traffic havoc.

In FreeBSD, you can manually configure the routing table for the
individual interfaces.. but it sounds to me as if you are attempting to use two ethernet interfaces connected to two disjointed networks connected to routers with two seperate subnets in order to balance http requests to
one server.. is this the case? I guess I am not fully understanding your configuration ...

T.


----- Original Message ----- From: "Gustafson, Tim" <[EMAIL PROTECTED]>
To: "Thomas Foster" <[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>
Sent: Wednesday, February 02, 2005 4:06 AM
Subject: RE: Routing Problem


Thomas,

No, I'm not using this box as a router. It is a web server, and I
need 
to spread the load of my web traffic across two separate T1s.

I can't just add routes.  You need a default route, or parts of the
internet would become inaccessible.  In my case, you need TWO default
routes.  I have set up Cisco equipment and Windows workstations with
two 
default routes in the past, and it has worked.  In fact, I have one
Windows box right now that is configured on both these networks with
two 
default gateways, and it is working.

There has to be a way to make it work on FreeBSD.

Tim Gustafson
MEI Technology Consulting, Inc
[EMAIL PROTECTED]
(516) 379-0001 Office
(516) 480-1870 Mobile/Emergencies
(516) 908-4185 Fax
http://www.meitech.com/



-----Original Message-----
From: Thomas Foster [mailto:[EMAIL PROTECTED]
Sent: Wednesday, February 02, 2005 4:48 AM
To: Gustafson, Tim
Cc: [EMAIL PROTECTED]
Subject: Re: Routing Problem


Im confused.. if you have two T1s, then are using /30s dor the ranges?
If
so.. what about not giving a default gateway for either one and just
add 

routes...

Are you attempting utilize this as just a router.?

Theres a section that covers setting up routing on interfaces in the
handbook:


http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/network-routin 
g.html

Hope this helps

T
----- Original Message ----- From: "Gustafson, Tim" <[EMAIL PROTECTED]>
To: <freebsd-questions@freebsd.org>
Sent: Tuesday, February 01, 2005 5:35 PM
Subject: Routing Problem


I am having a problem setting up a multi-homed host.  I have two
separate T1 internet connections, and one physical NIC in my FreeBSD
box.  The two networks are as follows:

Connection 1:
LAN Address: 1.2.3.24/25
Router Address: 1.2.3.1

Connection 2:
LAN Address: 4.5.6.106/29
Router Address: 4.5.6.105

I would like to set up my FreeBSD box so that I can connect to either
LAN address from the outside world.  The problem is that I cannot
specify two default gateways.  Right now, I have 1.2.3.1 set up as a
default gateway, and I can get to the 1.2.3.24 IP from the outside
world.  However, I can't get to 4.5.6.106.  I can't even ping it.
From
the FreeBSD box, I can ping 4.5.6.105, and from the outside world I
can 
ping 4.5.6.105, but I can't ping 4.5.6.106 from the outside world.

Is there any way to make this work?  How can I make FreeBSD have two
default gateways?  I read somewhere about being able to set up source
routing, but I haven't been able to find any HOWTO's about that.

Any help is greatly appreciated.








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