[j-nsp] ICMPv6 "packet too big" not being emitted

[Daniel Roesen]

Hi,

I'm troubleshooting a problem where a Juniper running some 6.4ish code
doesn't seem to emit ICMPv6 "packet too big, mtu=1480" packets if
receiving packets for an IPv6-in-IPv4 tunnel with manually configured
payload mtu of 1480 ("set family inet6 mtu 1480"). I cannot replicate
this problem on another box running the same JunOS code, nor can I
replicate it with 7.2R1.

Is there any known bug in this area which doesn't show up when browsing
the PR database?

This bug is serious as it breaks IPv6 PMTUD and creates traffic
blackholing.


Best regards,
Daniel

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