A couple more points to think about. How big is your block of address? If
it is less than a /19, it may get filter by the tie 1 ISP. It is VERY hard
to get a /19 right now. We are in the process of doing that and have to
readdress our servers every time we get a larger block. Can you use the
same ISP for both connection? That could simplify things for you.
Albert
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
Kevin S. Mahler
Sent: Wednesday, May 31, 2000 2:55 PM
To: Ritchi Craver; [EMAIL PROTECTED]
Subject: Re: Load balancing
The problem here is that the IP addresses assigned by
the ISP's are not portable. For example, you have an
IP range 199.250.138.0 from one ISP that you are directly
connected with. You use EIGRP to route that traffic over
to the other office where they send it out to the Internet.
When your reply comes back it will take a different path
since the routing tables on the Internet state that that IP
address is at your ingress port from your ISP. If you are
running a Firewall, the reply will never get past it since
it would not have seen the original packet.
Now if you get an AS number and work with the ISP's
to get BGP working between them and you, your IP addresses
will be advertised to the Internet as accessible two ways. The
packets will take the shortest path out and back to you since
your routers and the routers on the Internet have full routing
tables for these routes. If one of your ISP links fails, you will
still have full access since BGP will update the routing tables
on the Internet with that information.
This is over simplified a bit. I hope you don't mind I posted
this to the group for others.
Kevin
At 04:31 AM 5/31/00 -0700, you wrote:
>Can you use EIGRP and set the cost of the links yourself?
>
>
>"Kevin S. Mahler" wrote:
>>
>>What you want to do is rather complex. You can't really
>>"load share" between the two. About the only thing you could
>>do is request your own AS number and run BGP on your Internet
>>router with peers on both ISPs. This would require a good deal
>>of work on the ISPs part as well. Most charge for this type of
>>service. The last time I did it they charged about $500 each
>>plus the $500 for the AS number. You'll need a faster router
>>than a 4000 and it will need lots of memory.
>>
>>In a nutshell, it's a good deal of work.
>>
>>Kevin
>>
>>At 10:24 AM 5/31/00 +0800, William Wong wrote:
>> >Hello guys:-
>> >
>> >Senario:-
>> >
>> >I have a Cisco 4000 router.
>> >
>> >Ser 0 is direct connect to ISP through 64 K leased line.
>> >Now I installed another 128 K leased line which connect to my HQ. From
>> >there connect to another ISP.
>> >
>> >Lan IP is 192.228.156.0
>> >Ser0 is 164.142.2.201 (to my ISP)
>> >Ser1 is 164.147.52.201 (to my HQ)
>> >
>> >I want to configure the load balancing.
>> >What routing protocol I should use? (OSPF/EGRP/IGRP...)
>> >
>> >How should I configure the route table?
>> >Currently, the default route is route to 164.142.2.202
>> >
>> >Hope your guys can help me.
>> >
>> >
>> >Regards
>> >
>> >
>> >William
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >___________________________________
>> >UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html
>> >FAQ, list archives, and subscription info: http://www.groupstudy.com
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>>
>>--------------------------------------------------------------------------
---------------------------------------------------
>>Kevin S. Mahler, CCNP, CCDA, CCSE
>>Systems Engineer, Cisco Systems
>>Atlanta, GA
>>
>>Author of CCNA Training Guide, New Riders, ISBN 0735700516
>>Tech Editor of CCDA Exam Certification Guide, Cisco Press, ISBN 0735700745
>>Revision Author of Internetworking Technologies Handbook Third Edition,
>>Cisco Press
>>
>>See my homepage at
>>--------------------------------------------------------------------------
-------------------------------------------------
>>
>>-
>>
>>___________________________________
>>UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html
>>FAQ, list archives, and subscription info: http://www.groupstudy.com
>>Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
>
>
>
>Do You Yahoo!?
>Send instant messages & get email alerts with <http://im.yahoo.com/>Yahoo!
>Messenger.
----------------------------------------------------------------------------
-------------------------------------------------
Kevin S. Mahler, CCNP, CCDA, CCSE
Systems Engineer, Cisco Systems
Atlanta, GA
Author of CCNA Training Guide, New Riders, ISBN 0735700516
Tech Editor of CCDA Exam Certification Guide, Cisco Press, ISBN 0735700745
Revision Author of Internetworking Technologies Handbook Third Edition,
Cisco Press
See my homepage at <http://www.kmahler.com>
----------------------------------------------------------------------------
-----------------------------------------------
-
___________________________________
UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html
FAQ, list archives, and subscription info: http://www.groupstudy.com
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
___________________________________
UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html
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Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
