CGNAT Opensource with support to BPA, EIM/EIF, UPnP-PCP

Wed Jul 8 00:02:30 UTC 2020

> On 8 Jul 2020, at 03:23, JORDI PALET MARTINEZ via NANOG <nanog at nanog.org> wrote:
> 
> Hi Douglas,
>  
> There was, long time ago, something developed by ISC, but I think never completed and not updated …

ISC did a DS-LITE implementation called AFTR.  This can be found at:

		https://ftp.isc.org/isc/aftr/

> 464XLAT is always a solution and becomes much cheaper, than CGN from vendors, even if you need to replace the CPEs. I’m doing that now with 25.000.000 subscribers … (slowed down by the Covid-19).
>  
> Regards,
> Jordi
> 
> @jordipalet
> 
>  
> 
>  
>  
> El 7/7/20 18:44, "NANOG en nombre de Douglas Fischer" <nanog-bounces+jordi.palet=consulintel.es at nanog.org en nombre de fischerdouglas at gmail.com> escribió:
>  
> We are looking for a CGNAT solution open source based.
> 
> Yep, I know that basic CGNAT can be done with iptables / nftables, or PF / IPFILTER / IPFW.
> 
> But I only know Open Source CGNAT recipes with predefined public-ports <-> private IPs mapping.
> 
> What It brings two types of issues:
> A - The need to overprovision the number of private IPs (Considering Multiple BNGs behind the CGN).
> B - The inability of those basic recipes to deal with incoming auxiliary connections of p2p protocols (mostly used by games).
> 
> Te market solutions that I've dealt with solves those issues beautifully.
> a - Bulk-Port Allocation - BPA, avoid the need overprovisioning private address that is not being used, and give us an excellent rate between public IPv4 Address vs Private IP Address.
> b - The support of a framework of protocols(Ex.: UPnP, PCP, EIM/EIF, NAT-PMP, etc...) ensure an acceptable quality of experience to end-users.
> 
> But, the market solution brings also some down-sides...
> - The cost, evidently.
> - The need for detouring the traffic that doesn't need CGNAT(Internal CDNs, Internal Servers, etc), to stay on the license limits of those boxes, sometimes brings some issues.
> 
> So, I and some friends are(for a long time) looking for an OpenSource solution that can give us something near what the market solutions give.
> 
> Any of you guys ave some suggestions for that?
> 
> 
> P.S.: Yes, I know that IPv6 is the only real solution for that, but until there, our customers still want to access a lot os p2p content(mostly audio in game rooms, sip calls, and things like that.)
> 
> P.S.2: Yes, I also know that 464 could be a good possibility, but is not possible in this scenario.
>  
> -- 
> Douglas Fernando Fischer
> Engº de Controle e Automação
> 
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