route filtering policies (from "split b" thread)

[Pete Bowden]

Yes, but in your case you should be announcing your larger agregate...
so...  since your customer should still be reachable from you if the route
is filtered they will not see the more specific and will see the agregate
and route the block to you...  you in turn will hand it over to your customer.
No need for them to lie about anything....  you just need to make the case to
them that this is how it works for technical reasons beyond your ability to
control -- technical reasons being limiting bandwidth and other providers
not feeling like they should be compelled to provide free passage of other
peoples blocks.

> 
> This conversation about filter leaves me scratching my head.
> 
> Some of you are making a specific assumption that only large bandwidth, large
> block users must multihome between various providers. While I do not argue
> that this is the most common situation, it is not the only situation.
> 
> We support one company that is currently multi-homed between two providers
> and will likely be adding a third. No line is larger than a T1. The customer
> barely needs a /24. So we provide the customer a /24. He then announces this
> network to his other vendor as well as through us.
> 
> If this customers routes get filtered because the company's address block
> isn't large enough, the only thing you are doing to placing pressure on the
> customer to fake the need for more IP addresses so that their network gets
> announced and carried by more networks. Am I the only one who thinks that
> such filtering policies are counter intuitive?
> 
> The need to preserve IP space is at odds with the needs to hold down the size
> of the BPG announcements. ARIN members needs to make a choice. I don't like
> rules that force my customers to lie to me or suffer poor routing.
> 
> /* Mike Lieberman                            Mike at NetWright.Net */
> /*                         President                            */
> /*                       Net Wright LLC                         */
> /*                   http://www.netwright.net/                  */
> /*                 Voice and Fax: 307-857-1053                  */
> 


-- 
Pete Bowden, Internet Network Engineer, Internet & Data Center Engineering
    rePete at concentric.com  rePete at cncx.com  pete at internex.net  NIC:PB8
Concentric Network Corporation, 1400 Parkmoor Ave., San Jose, CA  95126-3429
		  Voice: 408-808-6010    Fax: 408-808-6010