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Re: [Softwires] [BEHAVE] Last Call: <draft-ietf-behave-v4v6-bih-06.txt> (Dual Stack Hosts Using "Bump-in-the-Host" (BIH)) to Proposed Standard

"Dan Wing" <dwing@cisco.com> Fri, 30 September 2011 16:02 UTC

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From: Dan Wing <dwing@cisco.com>
To: 'GangChen' <phdgang@gmail.com>
References: <916CE6CF87173740BC8A2CE4430969620377183F@008-AM1MPN1-037.mgdnok.nokia.com> <081701cc7cac$837a9610$8a6fc230$@com> <CANF0JMDD63X=sBOpvbDUF0euu-THo=v0ffcZ7Z_Pfa+HzTcdzg@mail.gmail.com> <09b701cc7d16$6943df30$3bcb9d90$@com> <CANF0JMAx295QeShpTOOXW-te-EnbatoNe2N0ZeOOYKt2PCfE_Q@mail.gmail.com> <CAD6AjGQGHn9jPgk8OixEL-vWUCStsxvtizEa_biKU9GFSbp_EQ@mail.gmail.com> <013d01cc7df7$7af51d20$70df5760$@com> <CAM+vMERvNkt42vDjJ_J-7khOJh3S4dETqc4JpUSEyfLXnMwmug@mail.gmail.com> <067d01cc7ec7$e1fc9400$a5f5bc00$@com> <CAM+vMES4hcxC3Z1aNS7Q0sLFaBuPa3sFzB3AGmUerVyCuoZPRA@mail.gmail.com>
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Date: Fri, 30 Sep 2011 09:05:29 -0700
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Cc: softwires@ietf.org, behave@ietf.org, ietf@ietf.org
Subject: Re: [Softwires] [BEHAVE] Last Call: <draft-ietf-behave-v4v6-bih-06.txt> (Dual Stack Hosts Using "Bump-in-the-Host" (BIH)) to Proposed Standard
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> -----Original Message-----
> From: GangChen [mailto:phdgang@gmail.com]
> Sent: Friday, September 30, 2011 2:53 AM
> To: Dan Wing
> Cc: Hui Deng; behave@ietf.org; ietf@ietf.org; softwires@ietf.org;
> Cameron Byrne
> Subject: Re: [BEHAVE] Last Call: <draft-ietf-behave-v4v6-bih-06.txt>
> (Dual Stack Hosts Using "Bump-in-the-Host" (BIH)) to Proposed Standard
> 
> >>
> >> Option 1:
> >>
> >> +---------------+
> >> |BIH(FTP sever) |----------NAT64-------FTP Client
> >> +---------------+
> >>
> >>
> >> Option 2:
> >>
> >> +---------------+
> >> |BIH(FTP sever) |--------------FTP Client
> >> +---------------+
> >>
> >> In the case of Option 1, it can't work since NAT64 couldn't support
> >> IPv4 initiated session
> >
> > I agree it would fail with a passive-mode transfer.  But it should
> > work with an active-mode transfer.
> >
> 
> In an active-mode transfer, IPv4 client needs initiate the TCP
> connection to a port on the FTP sever in advance. Afterwards, FTP
> server connects back to the client.
> I'm not sure how could NAT64 support the first step (i.e. IPv4
> initiated TCP connection)?

Static mapping in the NAT64, for the FTP control channel (port
21 or an alternate port).  That could be done by the user's
profile (draft-cheng-behave-nat-fwd-port-radius-ext), PCP, or
a web portal that manages the NAT64's configuration.

-d


> Many thanks
> 
> Gang

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