I usually don't jump into the middle of discussions like this, but if
you are sending traffic out to the internet, you are not only concerned
with which interface your traffic leaves, but also which interface
traffic comes back in on. The only way to maintain symmetry in your
traffic is to either have some both connections to a single ISP and make
some arrangements with them to load balance, or in the case of multiple
ISPs, you have to run BGP. That is the only way that I'm aware of to
advertise routes to a single block of addresses through multiple ISPs.
The load balancing mentioned in the links below are on two links to the
same place. That is not the case detailed in the initial e-mail.
-----Original Message-----
From: Ben Setnick
Sent: Tue 12/11/2001 7:07 AM
To: [EMAIL PROTECTED]
Cc:
Subject: RE: Source-sensitive Routing ...
If your router has 2 serial ports there is no need for any other
device to
do load balancing. There is also no requirement that you run
any type of
dynamic routing protocol. The router will do per-destination
load balancing
across 2 equal cost static routes. Please take a look at this
page on
Cisco's website:
How Does Load-Balancing Work?
http://www.cisco.com/warp/public/105/46.html
How Are Packets Routed for IP over Equal Paths?
http://www.cisco.com/warp/public/105/27.html
You will not need any additional equipment, and depending on
your needs, by
doing NAT on the router you may be able to eliminate the proxy
server
altogether.
Ben Setnick
-----Original Message-----
From: Pradeep Kumar [mailto:[EMAIL PROTECTED]]
Sent: Saturday, December 08, 2001 7:48 PM
To: Eric Schroeder; [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED]
Subject: RE: Source-sensitive Routing ...
If I were you Rakesh, I would use a WAN link load balancing in
this
scenario.
Can you spend $800 more for a load balancer.
I tried brain storming this with a few collegues and someone
suggested to do
ospf on both and load balance.
Do you have statics to the isp 1, 2 or are u routing ?
Eric- can you do lb using BGP ?
-Pradeep Kumar
-----Original Message-----
From: Eric Schroeder [mailto:[EMAIL PROTECTED]]
Sent: Thursday, December 06, 2001 10:18 AM
To: [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED]
Subject: Re: Source-sensitive Routing ...
One way to do this is to use BGP. This load balances ok if you
have two
Teir 1 providers, but will not load balance otherwise. The
advantage is
this is the only way to provide uptime if one of the ISPs goes
down unless
you do NAT on the Cisco 2514. You may have problems running BGP
on a
2514, but I think this will work as long as you only get routes
to connect
hosts from each ISP, and then set the default route to the least
used
link.
Hope this helps.
Eric Schroeder
[EMAIL PROTECTED]
12/05/2001 09:44 PM
To: [EMAIL PROTECTED]
cc:
Subject: Source-sensitive Routing ...
Dear memebers,
I have the following network
configuration:
--------------------------------------------------------
|
|
| 10.x.x.x
|
|
|
--------------------------------------------------------
|
|
----------------------
| Dual Homed
Gateway |
----------------------
|
|
--------+-------------
| Cisco 2514
Dual LAN |
| Router
|
| |
| wan1 wan2 |
---+------------+-----
| |
| |
| |
ISP1 |
|
ISP2
========================================
+ +
+
INTERNET
+
+
+
========================================
All our clients in the private network address (10.x.x.x). Using
the
Proxy Server at Dual homed gateway, these clients get connected
to
Internet using ISP1 link. Recently we have received another link
for
Internet connection from ISP2. Hence we are planning to route
some of the
clients of private network address(10.x.x.x) through ISP1 link
and the
remaining ones through ISP2 link, using Cisco 2514 Dual LAN
Router
running IOS software 11.0. After reading the Cisco documents, I
came to
know that this is possible through SOURCE-SENSITIVE routing at
the
Router.
I want to know the followings:
1. Is there any alternative way(s) to achieve this goal using
the same
router having two WAN interfaces?
2. What are the security issues related to SOURCE-SENSITIVE
routing ?
Waiting for your suggestions ....
Rakesh Kumar
============
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