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Re: [Ecrit] Emergency Call Framework for Canada; Questions on draft-ietf-ecrit-framework-09

Ray.Bellis@nominet.org.uk Wed, 03 June 2009 13:46 UTC

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Subject: Re: [Ecrit] Emergency Call Framework for Canada; Questions on draft-ietf-ecrit-framework-09
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> > If the ISP is running a CGN such that the end user cannot find a
> > non-RFC1918 public IP address, then all the ISP has to do (per
> > draft-thomson-geopriv-res-gw-lis-discovery-01) is provision the
> > appropriate NAPTR records in "in-addr.arpa" for whatever private IP 
space
> > they are using.
> 
> Isn't this making assumptions about which DNS resolver the end host is
> using?  I don't believe we can assume the end host is using the Access
> Provider's resolver. 

Good point, that may need some more thought.

In the generic case it's fine, because a public IP would be mapped in the 
public in-addr.arpa zone.

> A common occurrence of bringing up a VPN split-tunnel
> can change the resolver a host utilizes, or for some, static resolver
> assignments are made.

As with other LIS discovery processes, this needs doing before any VPNs 
are established.

Ray

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