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Re: [homenet] DNCP/HNCP Revisited

"Ray Hunter (v6ops)" <v6ops@globis.net> Wed, 18 September 2019 14:25 UTC

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To: Mark Andrews <marka@isc.org>
Cc: HOMENET <homenet@ietf.org>
References: <2737406f-c615-3963-2226-d2eadf79e846@globis.net> <3239E081-4B52-464D-85A4-57D17DAD574B@isc.org>
From: "Ray Hunter (v6ops)" <v6ops@globis.net>
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Date: Wed, 18 Sep 2019 16:25:21 +0200
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Subject: Re: [homenet] DNCP/HNCP Revisited
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Mark Andrews wrote on 18/09/2019 12:00:
>
>> Question: As a simple mitigation, is there any way of manually signalling to the kernel that ALL UDP packets on port 8231 should assume an PMTU of 1280 octets?
> setsockopt(IPV6_USE_MIN_MTU=1); from RFC 3542 works provided the OS has implemented it.  It’s a really pity that POSIX hasn’t picked up RFC 3542 in the 16 years since it was published like they picked up RFC 3493.  This is a epic fail of SDOs.

Thanks for the tip.

Unfortunately checking <linux/in6.h> in the current openwrt build tree.
.
#if 0   /* not yet */
#define IPV6_USE_MIN_MTU        63
#endif

:( not yet implemented

-- 
regards,
RayH
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