Subject: Re: [Mip6] [issue94] fixing encapsulation mechanism in IPv4 network

From: Tim Enos <[email-masked]>
Date: Tue, 20 Mar 2007 13:33:13 -0500 (CDT)

Hi all,

>Hello,
>
>Keiichi SHIMA wrote:
>> New submission from Keiichi SHIMA <[email-masked]>:
>> 
>> The current DSMIPv6 draft specifies two encapsulation formats, one is the IPv4 encap format, the other is 
>> UDPv4 encap format.  The default encapsulation format is the IPv4 format, and if the HA explicitly 
>> specifies to change the encapsulation format to the UDPv4 format if there is a NAT box between the HA 
>> and the MN.  Because of this specification, HA and MN have to support both encapsulation formats and 
>> have to change the format dynamically, that may increase the hurdle for implementors and may cause 
>> complexity in interoperability.
>
>If I remember right, this was among the first few issues that
>were discussed in the design team. Some folks did suggest
>turning on UDP all the time when the access network is IPv4.
>But this is an overhead in case there is no NAT.
 Thats why
>we have a NAT detection mechanism in the DS-MIPv6. UDP
>encapsulation is turned on only if a NAT is detected. My
>preference is to still go with this.
>

FWIW, I agree that the NAT detection mechanism in DS-MIPv6 is the better way to go. 

Best Regards,

Tim Enos
Rom 8:28

<snip>

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