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Re: IPv4 traffic on "ietf-v6ONLY"

"Rajiv Asati (rajiva)" <rajiva@cisco.com> Thu, 16 November 2017 10:32 UTC

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From: "Rajiv Asati (rajiva)" <rajiva@cisco.com>
To: Philip Homburg <pch-ipv6-ietf-4@u-1.phicoh.com>, "ipv6@ietf.org" <ipv6@ietf.org>
Subject: Re: IPv4 traffic on "ietf-v6ONLY"
Thread-Topic: IPv4 traffic on "ietf-v6ONLY"
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Date: Thu, 16 Nov 2017 10:32:20 +0000
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While I do agree to RA being better than DHCP(v6) for the purpose discussed here, I also agree with Philip wrt L-flag usage. PvD L-flag = 0 would not prohibit a host from using IPv4 on the access.

We might be better off defining a new flag that explicitly indicates for host to ‘Suppress IPv4’. 

-- 
Cheers,
Rajiv  

-----Original Message-----
From: ipv6 <ipv6-bounces@ietf.org> on behalf of Philip Homburg <pch-ipv6-ietf-4@u-1.phicoh.com>
Date: Wednesday, November 15, 2017 at 7:40 AM
To: "ipv6@ietf.org" <ipv6@ietf.org>
Subject: Re: IPv4 traffic on "ietf-v6ONLY" 

    >There's an L flag in draft-ietf-intarea-provisioning-domains
    >that says "DHCP(v4) on this network". So L=0 says "No DHCP(v4) on
    >this network".
    
    Maybe I'm reading the draft too strictly, but it seems that the L flag is used
    to tell which provisioning domain DHCPv4 information belongs to. Not to tell
    a host to avoid using DHCPv4 in the first place.
    
    If it does have the intention to make hosts avoid DHCPv4 requests then it
    has the same drawback as in sending a 'no IPv4' option in RA or DHCPv6:
    in an IPv4-only network that can be used to prevent hosts from connecting to
    the network.
    
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