You may be interested in a study we did early this year with Alcatel. We looked at all the traffic to the DSL customers of a NZ ISP over three days and measured how many terminated incoming connections. The results were surprising (high). David Miles presented the results at Apricot specifically in the context of SP-NAT. I'm not at work and can't find the slides on the web which is why I'm not being specific about the results but if you contact Shane Alcock at Waikato he did the work and has the detailed results. Currently I'm trying to negotiate to capture traffic from another NZ ISP and if we are successful we would probably update this study and could look at other variations that you might suggest. Richard. Nathan Ward wrote:
Hi all,
I'm attempting to get a bead on the importance of end-to-end IPv4.
By that I mean, home DSL user talking to another home DSL user.
This is something that would break if we ran out of IPv4 space tomorrow, and had to start putting customers behind service provider NAT (SP-NAT).
There's two ways I'm looking at doing this are: 1) Using a vendor box on loan to do p2p packet inspection for a month or so. This will tell us about how much "p2p[1]" traffic there is on a network, compared to non-p2p traffic. 2) Getting a packet capture from somewhere on a network for an hour, or whatever is feasible in terms of storage and processing power. The target of the capture would be traffic to/from a certain block of an ISPs end user type customers (so, a DSL pool probably). Analyse this and match it against dynamic address pools. - Anything going out to another dynamic pool (as determined by one of those dynamic pool lists) is something that would be broken by SP-NAT. - Any new incoming connections is something that would be broken by SP-NAT.
If there's anyone that's interested in the following please let me know: a) Helping me with some research b) Getting some free intelligence on the type of traffic on your network (wave it in front of marketing, and drip feed them the pretty graphs whenever you want something from them)
My intent is to publish the results stuff freely, publicly and widely.
I'd even like to get to the point where we can do it regularly perhaps? Let me know if you're open to that.
-- Nathan Ward
[1] By this I mean file sharing, skype, etc. Stuff commonly identified with the "p2p" buzz word, as opposed to the technical peer-to-peer phrase. _______________________________________________ NZNOG mailing list NZNOG(a)list.waikato.ac.nz http://list.waikato.ac.nz/mailman/listinfo/nznog