[j-nsp] network engineering

[Keegan.Holley at sungard.com]

I'm sure someone will correct me if I'm wrong but if you plan to multihome 
and actually use more than one connection you cannot completely prevent 
this from happening.  You can of course manipulate the attributes to make 
certain flows use the same link.  This should be on a case by case basis 
and is not very scalable (like to the whole table).  Asymmetric routing is 
not a bad thing by and large just make sure your links are roughly the 
same speed.


Keegan Holley ? Network Engineer I ? SunGard Availability Services ? 
401 North Broad St. Philadelphia, PA 19108 ? (215) 446-1242 ? 
keegan.holley at sungard.com Keeping People and Information Connected® ? 
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From:
Matthias Gelbhardt <matthias at commy.de>
To:
juniper-nsp <juniper-nsp at puck.nether.net>
Date:
02/06/2009 04:12 AM
Subject:
[j-nsp] network engineering
Sent by:
juniper-nsp-bounces at puck.nether.net



Hi!

I have a little network engineering question and I would like to know 
the best practice for that.

We have asymmetric routing in several cases. I would like to know, how 
you would deal against that? Is there a simple way to send the packets 
out of the same interface, they are received? But on the other hand, 
many packets are send out by us, and we do not know, where the other 
side is sending their packets into our network.

Is there a way to get an information, on which interface, better on 
which BGP session the reverse path is coming in? Yes, there are 
traceroute sites and looking glasses, but not for every network we 
deal with.

The way I see it, the only way is to get the information, on which 
interface the packets coming in (either by using a tool on the box or 
by asking the network operator itself) ans then setting a local 
prefernce to send the packet out of the same interface.

Any better ideas?

Regards,

Matthias
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