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Re: [Int-area] Call for adoption of draft-xu-intarea-ip-in-udp-03

Joe Touch <touch@isi.edu> Mon, 30 May 2016 18:13 UTC

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To: joel jaeggli <joelja@bogus.com>, Xuxiaohu <xuxiaohu@huawei.com>, "Fred Baker (fred)" <fred@cisco.com>, Wassim Haddad <wassim.haddad@ericsson.com>
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From: Joe Touch <touch@isi.edu>
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Subject: Re: [Int-area] Call for adoption of draft-xu-intarea-ip-in-udp-03
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On 5/29/2016 4:23 PM, joel jaeggli wrote:
>> > I.e., you MUST support source fragmentation at the ingress at the outer
>> > IPv6 layer (because UDP doesn't have support for fragmentation and
>> > reassembly). If you make this requirement, you can handle IPv6 over the
>> > tunnel.
> Yeah I don't support it for this reason. getting IP fragments back
> together in the same place a reassembled is hard is in some cases
> especially when you hash. (see frag drop) given alternatives that better
> address such situations it seems hard to justify.

If you intend to support recursive IP tunneling* and believe that IP has
a minimum MTU, then you have to accept reassembly.

Joe

* where "recursive IP tunneling" is IP in [zero or more other protocols]
in IP.

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