Re: [Idr] draft-walton-bgp-hostname-capability-00

"Thomas Mangin" <thomas.mangin@exa-networks.co.uk> Sun, 17 May 2015 12:12 UTC

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From: Thomas Mangin <thomas.mangin@exa-networks.co.uk>
To: heasley <heas@shrubbery.net>
Date: Sun, 17 May 2015 13:11:55 +0100
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Subject: Re: [Idr] draft-walton-bgp-hostname-capability-00
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>>>> and we're all waiting for the attack where the sender puts tasty
>>>> things in the supposed dns name
>>> If the worry is about the complexity of handling UTF-8, the draft
>>> could be change to require ascii 'a' through 'z' (in a
>>> case-insensitive manner), the digits '0' through '9', and the hyphen
>>> ('-') to be put in the draft as it is what DNS allows.
>>
>> bzzzzt!  dns is eight bit clear.  you are thinking of some 
>> restrictions
>> on hostnames, the leftmost chunk of the lhs at most.
>
> in which, '-' is not valid, iirc.

‘-‘ is definitively acceptable in hostnames, many of mine are called 
“service-number”.
For the disclosure, this is copy and paste from wikipedia.

Thomas