Re: Recommended value for the Hop Limit?

[Thomas Narten <narten at us.ibm.com>]

Fred Baker <fred at cisco.com> writes:

> There are a number of RFCs with specific values. You might look at RFC  
> 2473 (64),

Specifically, the text at issue says:

>           Hop Limit:
> 
>             The tunnel IPv6 header hop limit is set to a pre-configured
>             value - see section 6.3.
> 
>             The default value for hosts is the Neighbor Discovery
>             advertised hop limit [ND-Spec].  The default value for
>             routers is the default IPv6 Hop Limit value from the
>             Assigned Numbers RFC (64 at the time of writing this
>             document).

The intention of that wording was that the value to be used was the
same one as recommended for general use for IPv4, which IANA records.

http://www.iana.org/assignments/ip-parameters says:

> IP TIME TO LIVE PARAMETER
> 
> The current recommended default time to live (TTL) for the Internet
> Protocol (IP) is 64 [RFC791, RFC1122].

Obviously, this could be a bit clearer. IANA should have a similar
entry for Hop Limit, which might well just point to the IPv4 TTL
value.

Thomas