Re: [BEHAVE] Home NAPT44 - How many ports?
"Rajiv Asati (rajiva)" <rajiva@cisco.com> Wed, 05 June 2013 19:07 UTC
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From: "Rajiv Asati (rajiva)" <rajiva@cisco.com>
To: kaname nishizuka <kaname@nttv6.jp>, "Reinaldo Penno (repenno)" <repenno@cisco.com>
Thread-Topic: [BEHAVE] Home NAPT44 - How many ports?
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Date: Wed, 05 Jun 2013 19:04:43 +0000
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Cc: "v6ops@ietf.org" <v6ops@ietf.org>, "behave@ietf.org" <behave@ietf.org>, "Poscic, Kristian (Kristian)" <kristian.poscic@alcatel-lucent.com>, "Softwires-wg list (softwires@ietf.org)" <softwires@ietf.org>, "Erik Kline (ek@google.com)" <ek@google.com>
Subject: Re: [BEHAVE] Home NAPT44 - How many ports?
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Kaname-san, That's a good suggestion, though the captured data suggests that UDP NAT exhaustion is not a problem, but TCP NAT is. Cheers, Rajiv > -----Original Message----- > From: kaname nishizuka [mailto:kaname@nttv6.jp] > Sent: Wednesday, June 05, 2013 2:16 PM > To: Reinaldo Penno (repenno) > Cc: Michael Richardson; v6ops@ietf.org; Softwires-wg list > (softwires@ietf.org); Poscic, Kristian (Kristian); behave@ietf.org; Erik Kline > (ek@google.com); Rajiv Asati (rajiva) > Subject: Re: [BEHAVE] Home NAPT44 - How many ports? > > > With regard to the DNS packets, shortening the time-out of NAT table is > another good solution. > > In larger environment, we tested that when the time-out of DNS was > shortened to 3sec, the impact of such DNS requests was much smaller than > TCP sessions. > 3 sec is sufficient round-trip time in general situation. > I don't think it's necessary to place a recursive DNS server inside the CGN. > > Though there are differences between Home NAPT44 and CGN, it will work > well in both case. > That is because there are many devices in home and those seldom access > the web site within a short time simultaneously. > > regards, > -- > kaname > > (2013/06/06 1:27), Reinaldo Penno (repenno) wrote: > > > > On 6/5/13 1:23 PM, "Michael Richardson" <mcr+ietf@sandelman.ca> > wrote: > > > >>>>>>> "repenno" == repenno <Reinaldo> writes: > >> repenno> On the other hand, as Rajiv captured,the number of > >> repenno> UDP sessions can be much larger than the number of > >> repenno> TCP. Because the way > >> repenno> dynamic webpages are constructed today, there are > sometimes > >> repenno> literally 100s > >> repenno> of DNS requests to download a single page. > >> > >> If one is doing CGN, wouldn't it be reasonable to point customers' at > >> a recursive DNS server with an interface inside the CGN? > > Yes. That's what I suggest. But some people use, say, Google's > > DNS/OpenDns/etc and in some other cases the network is not setup > correctly. > > > >> This seems to also suggest that having a *caching* recursive DNS(SEC, > >> HOMENET+, mDNS+) server inside the customer router is also a big win. > > Yes, it is. > > > >> -- > >> ] Never tell me the odds! | ipv6 mesh > >> networks [ > >> ] Michael Richardson, Sandelman Software Works | network > >> architect [ > >> ] mcr@sandelman.ca http://www.sandelman.ca/ | ruby on rails > >> [ > >> > > _______________________________________________ > > Behave mailing list > > Behave@ietf.org > > https://www.ietf.org/mailman/listinfo/behave > > > -- > ---- > Kaname Nishizuka > Innovative Architecture Center > NTT Communications Corporation > +81-50-3812-4704
- [BEHAVE] Home NAPT44 - How many ports? Rajiv Asati (rajiva)
- Re: [BEHAVE] Home NAPT44 - How many ports? Poscic, Kristian (Kristian)
- Re: [BEHAVE] Home NAPT44 - How many ports? Michael Richardson
- Re: [BEHAVE] Home NAPT44 - How many ports? Reinaldo Penno (repenno)
- Re: [BEHAVE] Home NAPT44 - How many ports? Michael Richardson
- Re: [BEHAVE] Home NAPT44 - How many ports? Reinaldo Penno (repenno)
- Re: [BEHAVE] Home NAPT44 - How many ports? kaname nishizuka
- Re: [BEHAVE] Home NAPT44 - How many ports? Rajiv Asati (rajiva)
- Re: [BEHAVE] Home NAPT44 - How many ports? Rajiv Asati (rajiva)
- Re: [BEHAVE] Home NAPT44 - How many ports? Rajiv Asati (rajiva)
- Re: [BEHAVE] Home NAPT44 - How many ports? Rajiv Asati (rajiva)
- Re: [BEHAVE] Home NAPT44 - How many ports? Rajiv Asati (rajiva)
- Re: [BEHAVE] Home NAPT44 - How many ports? Reinaldo Penno (repenno)
- Re: [BEHAVE] Home NAPT44 - How many ports? Reinaldo Penno (repenno)
- Re: [BEHAVE] Home NAPT44 - How many ports? Simon Perreault
- Re: [BEHAVE] Home NAPT44 - How many ports? Rajiv Asati (rajiva)
- Re: [BEHAVE] Home NAPT44 - How many ports? Dan Wing
- Re: [BEHAVE] Home NAPT44 - How many ports? Rajiv Asati (rajiva)
- Re: [BEHAVE] [v6ops] Home NAPT44 - How many ports? Dan Wing
- Re: [BEHAVE] [v6ops] Home NAPT44 - How many ports? Branimir Rajtar
- Re: [BEHAVE] [v6ops] Home NAPT44 - How many ports? Owen DeLong
- Re: [BEHAVE] [v6ops] Home NAPT44 - How many ports? John Mann
- Re: [BEHAVE] [v6ops] Home NAPT44 - How many ports? Poscic, Kristian (Kristian)
- Re: [BEHAVE] [v6ops] Home NAPT44 - How many ports? Reinaldo Penno (repenno)
- Re: [BEHAVE] Home NAPT44 - How many ports? james woodyatt
- Re: [BEHAVE] Home NAPT44 - How many ports? Simon Perreault
- Re: [BEHAVE] [v6ops] Home NAPT44 - How many ports? Simon Perreault
- Re: [BEHAVE] [v6ops] Home NAPT44 - How many ports? ivan c
- Re: [BEHAVE] [v6ops] Home NAPT44 - How many ports? Mikael Abrahamsson
- Re: [BEHAVE] [v6ops] Home NAPT44 - How many ports? Benedikt Stockebrand
- Re: [BEHAVE] [v6ops] Home NAPT44 - How many ports? Rajiv Asati (rajiva)
- Re: [BEHAVE] [v6ops] Home NAPT44 - How many ports? ivan c