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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